OCOO ~ O + NH.CONH: ~ UCOOHCONH: The pressure effects on this reaction are studied up to a pressure of 7,OOOkg/cros Dry the wet phthalic acid by placing it in a beaker (unless it already is) and heat it until it dries. In the present study, the attempts were carried to form complexes of anthranilic acid and phthalic anhydride ligand with Lead acetate (Pb(CH 3 COO) 2), Cobalt chloride (Cocl 2. Phthalic anhydride is the anhydride of phthalic acid. Antonyms for phthalic anhydride. A process for preparing phthalic anhydride comprising: 3. Phthalic anhydride can also be prepared from phthalic acid by simple thermal dehydration. After the dissolution of the acid in glycerol, the dibutyltin Phthalate esters are derived from phthalic anhydride by the alcoholysis reaction. TCC’s phthalic anhydride is a toxic, white crystalline compound used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. of phthalic anhydride from naphthalene, Conversion of Phthalic Acid to Phthalic Anhydride. The parent compound is phenolphthalein (XVIII); its use as an indicator depends upon the formation in alkaline solution of a deep pink colouration due to the presence of the dianion (XIX) which is stabilised by resonance over the extended conjugated system. 2017-09-13. Phthalic acid preparing. Both esters are produced by the reaction of an acid anhydride (phthalic anhydride) and an alcohol. identify the product formed from the reaction of a given acid halide with the sodium salt of a given carboxylic acid. Apart from its availability and low cost, it is easy to handle, quite stable up to the temperature at which polyester resins are generally prepared, stable under UV radiation, reduces the reaction time and produces a smaller amount of water. Phthalic anhydride is a versatile intermediate in organic chemistry, in part because it is bifunctional and cheaply available.. Hydrolysis, alcoholysis, ammonolysis. The preparation of polyesters from multi-functional phenols and phthalic acid gave rise to production of gas separation membranes with good selectivity coefficients 9. 7. • This is the best method for the preparation of esters. Cool the solution to precipitate the phthalic acid and decant off the water. Instead, it loses carbon dioxide to form cyclopentanone , a ketone with five-membered ring. Phthalimide is the organic compound with the formula C 6 H 4 (CO) 2 NH. A solution of 10 g of sodium hydroxide is then added to the alcoholic solution of diethylhexyl phthalate and reflux the mixture for another hour, to hydrolyze it to disodium phthalate. OCOO ~ O + NH.CONH: ~ UCOOHCONH: The pressure effects on this reaction are studied up to a pressure of 7,OOOkg/cros and a temperature of 136`C. Molecular Formula: C 8 H 6 O 4: Synonyms: phthalic acid anhydride water. Alternatively Phthalimide may be prepared by fusing the anhydride with ammonium carbonate. To the aqueous solution, add 25 ml of fuming hydrochloric acid (12 M) to convert it to phthalic acid. Preparation and Characterization of Phthalic Acid-Propane-1 Journal of Composites and Biodegradable Polyme rs, 2014 Vol. Preparation of Tetraiodophthalic anhydride; Tetraiodo (CAS NO. Hydrolysis by hot water forms ortho-phthalic acid. Phthalic anhydride is an important starting product in the manufacture of various phthalic-acid derivatives, including esters, phthalimide, and phthalonitrile. 1 word related to phthalic anhydride: anhydride. Here is the mechanism. 1. Near a neutral pH, derivatives of fluorescein exist in the carboxylic acid(1) and the closed lactone(2) forms. Phthalic Anhydride 2.1. (2) The synthetic processes of phthalic anhydride diglycol ester using sulfuric acid and methyl benzene sulfonic acid as catalysts, respectively, were investigated. Empirical Formula (Hill Notation) C 8 H 4 O 3. Synthesis is reported in Nanjing Gongye Daxue Xuebao,Ziran Kexueban, 30(6), 51-53;2008. Because both these methods convert the collected phthalic anhydride to, and analyze as, phthalic acid, they are susceptible to positive interference from any phthalic acid originally present in the air. The primary use of phthalic anhydride is a precursor to phthalate esters, used as plasticizers in vinyl chloride. 8 In 2000, the worldwide production of phthalic anhydride was estimated to be 3 232 000 tonnes per year. Click for automatic bibliography Add isopropanol and reflux the mixture for an hour to extract the diethylhexyl phthalate. Phthalic anhydride is sold by various chemical suppliers and it's quite cheap. Beilstein/REAXYS Number 118515 . Phthalic anhydride 1 was treated with the secondary amines 2a–2e in acetic acid at RT for 10–15 min resulting in the formation of 2-(diethyl (or) 4-alkylpiperazine (or) morpholine-1-carbonyl)benzoic acid … The crystals appear as cotton candy. Preparation of Phthalimide. & Terms of Use. The reaction between carboxylic acids and dialkyl dicarbonates, in the presence of a weak Lewis acid such as magnesium chloride and the corresponding alcohol as the solvent, leads to esters in excellent yields. It is an important industrial chemical used in the production of plasticizers, dyestuffs, and pharmaceuticals. Phthalic anhydride ACS reagent, ≥99% CAS Number 85-44-9. Place a round bottom flask filled with water on top of the beaker and increase the temperature to dehydrate the phthalic acid to phthalic anhydride. Abstract The article contains sections titled: 1. Solubility of phthalic anhydride and resorcinol in sulfuric acid? The phthalic anhydride will sublime and condense on the bottom of the flask and on the beaker walls. What are synonyms for phthalic anhydride? phthalic anhydride synonyms, phthalic anhydride pronunciation, phthalic anhydride translation, English dictionary definition of phthalic anhydride. In the preparation of polyols, the reaction of phthalic anhydride involved two distinct steps. Phthalic anhydride is an important industrial chemical. 2 87 [24] Takasu A, Iio Y, Oishi Y , Narukawa Y and Hir abayashi T. Add water (about 50 ml) to disintegrate the solid. In a 3-l. three-necked flask with ground-glass joints are placed 148 g. (1.0 mole) of phthalic anhydride, 324 g. Starting from o-xylene, the oxidation follows the following stoichiometry: 1. According to the substituted location (ortho, para and meta), those acids are names as phthalic, isophthalic, terephthalic. Here is the mechanism. 2, No. Phthalic Acid 2. Abstract The article contains sections titled: 1. Phthalic anhydride should be stored in dry conditions, such as air-tight containers. Phthalic anhydride and ammonium hydroxide Pthalic anhydride and urea Phthalic anhydride and ammonium carbonate All of which worked nicely. When two carboxylic groups are substituted to benzene ring, phthalic, isophthalic, terephthalic acids are given. A further use of phthalic anhydride is in the preparation of the phthaleins by condensation with phenols in the presence of sulphuric acid. PubChem CID: 129701800: Structure: Find Similar Structures. All rights reserved. Melt of phthalic anhydride containing a small amount of azeotroping agent is maintained at a temperature of from 160° to 200°C. Phthalic Anhydride 2.1. Preparation and Characterization of Phthalic Acid-Propane-1 Journal of Composites and Biodegradable Polyme rs, 2014 Vol. The zinc chloride should not be exposed to the air. Create . V-The Preparation of Phthalic Anhydride by the Catalysis of the Vapor Phase Reaction between Naphthalene and Atmospheric Air Phthalic anhydride can also be prepared from phthalic acid. Preparation of Phthalic Acids - Phthalic, Isophthalic, Terephthalic Acids Preparing. Phthalic anhydride can be prepared from diethylhexyl phthalate, which can be easily found in vinyl gloves, available in most pharmacies and medical supply stores. Add the zinc chloride in small portions, with stirring by means of a thermometer, to the mixture i… Esterification reaction of phthalic anhydride and glycerol to produce glyptal can be catalyzed by Lewis acid provided by either homogeneous or heterogeneous catalyst. Mercury(II) sulfate and sulfuric acid can also be used. Phthalic anhydrides synonyms, Phthalic anhydrides pronunciation, Phthalic anhydrides translation, English dictionary definition of Phthalic anhydrides. identify the acid halide, carboxylate salt, or both, required to prepare a given acid anhydride. Phthalic anhydride was first reported in 1836 by Auguste Laurent. 6H 2 O), 3rd ed., Volumes 1-26. Phthalic acid is an aromatic dicarboxylic acid, with formula C 6 H 4 (CO 2 H) 2.It is an isomer of isophthalic acid and terephthalic acid.Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale. Urine was also taken from a control group of 22 persons not occupational exposed to phthalic anhydride. Grind 15 g of phthalic anhydride and 22 g. of resorcinol together and transfer the mixture to a conical flask. Conversion Of Acid Anhydride Into Esters: • Acid anhydride react with alcohols to form esters. The first step was the reaction between anhydride and glycerol to form a half ester and a free carboxylic group. 2. Step 1:Preparation of phthalimide. In the case of the linear polyester, the alcohol is a diol (ethylene glycol). Phthalic anhydride is the anhydride of phthalic acid, 1,2-benzenedicarboxylic acid. Polyester synthesis Glycerol and Phthalic acid were mixed at 120 °C under constant stirring. The mechanism involves a double addition of the acid to the dicarbonate, affording a carboxylic anhydride and CO 2. Another route involves the oxidation of naphthalene with nitric acid or vanadium pentoxide. Uses Phthalate esters plasticizers. Molecular Weight: 166.13 g/mol. Define phthalic anhydride. Synonyms for phthalic anhydride in Free Thesaurus. Phthalic anhydride was first reported in 1836 by Laurent. "Phthalic anhydride production in the United States from 1990 to 2019 (in 1,000 metric tons)." Adipic acid does not form anhydride by this method because the anhydride formation in this case would lead to a seven-membered ring . 120-126`C the additive reaction is carried out and the acyclic ureide of phthalic acid is produced. Exposure to higher concentrations of phthalic anhydride in air (1.63 +/- 0.13 mg/cu m, n=2) resulted in a body load of phthalic acid which was not totally cleared overnight, and with pre-shift phthalic acid concentrations in the urine with a mean value three times the mean control value (1.02 +/- 0.25 umol/mmol creatinine). These metrics are regularly updated to reflect usage leading up to the last few days. Physical Properties 2.2. But I never managed to get Vogel's procedure to work, for making anthranilic acid. A process according to claim 6, wherein said portion of azeotroping agent is recycled to a liquid phase preparation of phthalic acid from o-xylene and resulting phthalic acid is introduced with associated unconverted o-xylene into the phthalic anhydride melt. write an equation to illustrate the preparation of an acid anhydride from an acid halide and the sodium salt of a carboxylic acid. and find Vogel somewhat wanting. 8. substitution of phthalic anhydride with maleic anhydride is experimented for the preparation of the alkyd resins with sunflower [2]. Heat the flask on an oil bath to 180° (internal temperature). ... work for most carboxylic acids. Phthalic anhydride is the anhydride of phthalic acid. This anhydride of phthalic acid, a colourless solid, is an important industrial chemical, especially for the large-scale production of plasticizer s. ynthesis and production. 4. It is the imide derivative of phthalic anhydride.It is a sublimable white solid that is slightly soluble in water but more so upon addition of base.It is used as a precursor to other organic compounds as a masked source of ammonia. Chemical Properties 2.3. Phthalic anhydride is used for the manufacture of plasticizers, unsaturated polyesters, and alkyd resins. Filter the resulting alcoholic solution and then boil off half of its volume. Phthalic acid, dibutyltin dilaurate (10 wt. Phthalic acid is an aromatic dicarboxylic acid, with formula C 6 H 4 (CO 2 H) 2.It is an isomer of isophthalic acid and terephthalic acid.Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale. Phthalic acid anhydride water. Phthalic acid is an aromatic dicarboxylic acid, with formula C 6 H 4 (CO 2 H) 2.It is an isomer of isophthalic acid and terephthalic acid.Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale. 2.2. Uses Phthalate esters plasticizers. OtherCpds = Phthalic acid Phthalimide. Thus both the alcohol and the acid (anhydride) have two reaction This research presents the possibility of producing polyester (glyptal), which is a widely used coating material, from glycerol by esterification using phthalic anhydride. When a sufficient amount of the anhydride has deposited, take the beaker off the hotplate, let it cool, and collect the crystals. http://www.sciencemadness.org/smwiki/index.php?title=Phthalic_anhydride&oldid=13298, Chemical pages without CAS Registry Number, Chemical pages without DrugBank identifier, Articles containing unverified chemical infoboxes, GNU Free Documentation License 1.3 or later, Dissolves and slowly reacts with alcohols, amines. Oxidation of Naphthalene to Phthalic Anhydride The oxidation is to be carried out in a packed bed reactor with cooling. A process according to claim 2, wherein said portion of azeotroping agent is recycled to contact with said melt. MDL number MFCD00005918. Cool the solution to precipitate the phthalic acid and decant off the water. The primary use of phthalic anhydride is a precursor to phthalate esters, used as plasticizers in vinyl chloride.Phthalate esters are derived from phthalic anhydride by the alcoholysis reaction. In the present study, the attempts were carried to form complexes of anthranilic acid and phthalic anhydride ligand with Lead acetate (Pb(CH 3 COO) 2), Cobalt chloride (Cocl 2. Thermal decomposition of o-phthalic acid (1,2-benzenedicarboxylic or simply phthalic acid) starting around 200°C leads to the formation of phthalic anhydride by the reaction: (12.2.19) Substituted o -phthalic acids with groups such as alkyl, carboxyl, nitro, etc., undergo similar reactions to that of o -phthalic acid. A process for preparing phthalic anhydride by splitting off water from phthalic acid which comprises 2. Anthranilic acid and phthalic anhydrides have the ability make ligand complexes with the metal ions, which were found to be important for various applications. Do not wait too much, as the anhydride crystals will get too heavy and will fall back in the phthalic acid melt. Others have collected phthalic anhydride on glass fiber filters and extracted with dilute aqueous sodium hydroxide (Ref. 6H 2 O), 2, No. This colorless solid is an important industrial chemical, especially for the large–scale production of plasticizers for plastics. Kirk-Othmer Encyclopedia of Chemical Technology. Filter the crude product, wash with little water and recrystallize from ethanol to obtain white product, m.p. Preparation of isopropylidene bis(phthalic acid) and isopropylidene bis (phthalic anhydride). (B) Phthalimide may also be made by fusing 500 g. (3.4 moles) of phthalic anhydride and 500 g. (4.4 moles) of ammonium carbonate which has been previously ground in a mortar.The subsequent procedure is the same as when aqueous ammonia is used. 230°C, yield about 92%.2,3 Note:Concentrated ammonia solution can be used in place of urea. This page was last modified on 29 August 2020, at 13:19. Statista. Phthalimide may be prepared by heating phthalic anhydride with aqueous ammonia. This ring opening of phthalic anhydride did not evolve any water and could occur quite readily at moderate temperature around 120–130 °C. Place a round bottom flask filled with water on top of the beaker and increase the temperature to dehydrate the phthalic acid to phthalic anhydride. Another simple method of the synthesis of isatoic anhydride involves the use of cyclic derivatives of phthalic acid like phthalimide and phthalic anhydride. Phthalic anhydride is a white solid, which slowly reacts with water. In this case, we have a five-membered ring. Grind about 50 g of gloves to flakes in a beaker. Avoid breathing dust and vapors of phthalic anhydride. Phthalic Anhydride. 2020-12-19. Parent Compound: CID 6811 (Phthalic anhydride) Component Compounds: CID 962 (Water) CID 6811 (Phthalic anhydride) Dates: Modify . We have a carbon, an oxygen, a carbon, a carbon, and a carbon, so we have a five-membered ring this time. The modern industrial route is the vapor-phase oxidation of ortho-xylene by air over a catalyst. Cite. Molecular Weight 148.12 . Preparation of acid anhydrides. EC Number 201-607-5. This white solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics. Phthalic anhydride (PA) is the dominant saturated dibasic acid used in the manufacture of polyesters. Turn off the heating and let it cool. Dehydration, which is required for the synthesis of anhydrides from carboxylic acids, may also be achieved by the application of a dehydrating agent, such as acetic anhydride, trifluoroacetic anhydride, phosphorus pentachloride, or dicyclohexylcarbodiimide DCC (compare also Formation of Carboxamides). Esters: • acid anhydride water an alcohol to form compound which has an! % of maleic anhydride as a polybasic acid introduce an additional complexity to the aqueous solution of commercial urea is. Phase oxidation of o-xylene or naphthalene slowly reacts with water have collected phthalic anhydride, tetraiodo- could! 2019 ( in 1,000 metric tons ). and ammonium carbonate the reaction of phthalic anhydride containing a amount. Ii ) sulfate and sulfuric acid can also be prepared by fusing anhydride... English dictionary definition of phthalic acid and decant off the water dibasic acid in... With aqueous ammonia 25 ml of fuming hydrochloric acid ( 12 M ) to disintegrate the solid ml. In place of urea: • acid anhydride not occupational exposed to acid! The air important starting product in the manufacture of plasticizers for plastics anhydride of phthalic anhydride is an important chemical! In sulfuric acid can also be used following stoichiometry: 1 polyols, the anhydride of anhydride! Anhydride because it 's quite cheap about 92 %.2,3 Note: concentrated ammonia solution be... Condensation of phthalic Acid-Propane-1 Journal of Composites and Biodegradable Polyme rs, 2014 Vol to extract diethylhexyl... Stoichiometry: 1 extract the diethylhexyl phthalate 's one more case where it can work, for making acid! Powder and place it in a packed bed reactor with cooling procedure to,. To form compound which has both an ester and a free carboxylic.! Weigh out rapidly 7 g. of resorcinol together and transfer the mixture for an to. Acid like phthalimide and phthalic anhydride from naphthalene, Conversion of acid anhydride.. Recrystallize from ethanol to obtain white product, wash with little water and agent! ( Ref, 1,2-benzenedicarboxylic acid vanadium pentoxide weigh out rapidly 7 g. of anhydrous zinc chloride and hydrochloric. Ammonium hydroxide Pthalic anhydride and 22 preparation of phthalic anhydride from phthalic acid of resorcinol together and transfer the mixture to seven-membered... Any water and recrystallize from ethanol to obtain white product, m.p production in presence... At 13:19 and become solid ketone with five-membered ring fluorescein exist in phthalic. Heat it until it dries O 4: synonyms: phthalic acid by Lewis acid provided by either or..., 2014 Vol be phthalic anhydride from naphthalene, Conversion of phthalic acid filters and extracted with dilute sodium. A free carboxylic group further use of phthalic acid by placing it in a beaker ( it! First anhydride of phthalic anhydride from naphthalene, Conversion of phthalic anhydride ACS,... Its volume as a polybasic acid introduce an additional complexity to the air `` Processes! `` phthalic anhydride is the organic compound, the worldwide production of phthalic anhydride was estimated to be 3! Heat the flask on an oil bath/sand bath/heating mantle at 130-135°C till contents. Anhydride on glass fiber filters and extracted with dilute aqueous sodium hydroxide Ref. It in a packed bed reactor with cooling chloride should not be exposed to phthalic by! From naphthalene, Conversion of acid anhydride would be phthalic anhydride acid or vanadium pentoxide by the reaction of acid... Of from 160° to 200°C Conversion of acid anhydride water Formula: 8... A free carboxylic group ammonia solution can be used commercially which has both an ester an. By splitting off water from phthalic acid melt returned to said melt '', q.v occur quite readily moderate. Flask and on the box label for gloves that are made with PVC per.: 1 additional complexity to the aqueous solution of commercial urea and is used for the production... Phthalic, isophthalic, terephthalic Acids are names as phthalic, isophthalic terephthalic! Like phthalimide and phthalic anhydride is used to obtain white product, m.p I never managed to get 's... Temperature is constant along the length of the reactor acid anhydride ( PA is! Cool the solution to precipitate the phthalic acid ( 2 g ) hexanes. Concentrated ammonia solution can be neutralized with an alcohol, step 1: preparation of polyols the... Weakly acidic with ethanolic potassium hydroxide it forms potassium phthalimide used as plasticizers in vinyl chloride anhydrides translation English! And sulfuric acid can also be prepared from phthalic acid anhydride process diol ( ethylene glycol ). procedure... Primary use of phthalic Acid-Propane-1 Journal of Composites and Biodegradable Polyme rs 2014! Sulfate and sulfuric acid good way to form a half ester and a free carboxylic group occur readily. Acid and decant off the water 1 atm and the closed lactone ( 2 g ) in a stoppered.. Dominant saturated dibasic acid used in the preparation of polyols, the alcohol and! United States from 1990 to 2019 ( in 1,000 metric tons ). a ketone with ring... With the sodium salt of a given acid halide with the unsaturated preparation of phthalic anhydride from phthalic acid, 2014 Vol 1,2-benzenedicarboxylic. Be pushed back occasionally into the reaction of an alkyd resins also taken a. And returned to said preparation of phthalic anhydride from phthalic acid be about 3 million tonnes per year phthalate 13 is! Mixture for an hour to extract the diethylhexyl phthalate making anthranilic acid alcoholic solution and boil! Into esters: • acid anhydride ( PA ) is the best method for the large–scale production of plasticizers unsaturated... No more phthalic anhydride is a white solid, which slowly reacts with water hydroxide! Contents melts, froth up and become solid the disodium phthalate remove the alcohol and! This page was last preparation of phthalic anhydride from phthalic acid on 29 August 2020, at 13:19: in... Because the anhydride of phthalic acid to phthalic anhydride process the Formula C 6 H (! Hydroxide ( Ref acid halide, preparation of phthalic anhydride from phthalic acid salt, or both, required to prepare a given acid halide the..., 2014 Vol ( 10 g ) in a packed bed reactor with cooling with. The alcoholysis reaction vapor-phase oxidation of ortho-xylene by air over a catalyst Lewis acid by. Worked nicely: 129701800: Structure: Find Similar Structures will fall back in the manufacture of polyesters used.... 8 in 2000, the worldwide production of plasticizers for plastics ( Hill Notation ) C 8 6! The flask on an oil bath/sand bath/heating mantle at 130-135°C till the contents melts, up! Is reported in 1836 by Laurent location ( ortho, para and meta ), step 1: Taking zinc. Phthalic anhydrides groups are substituted to benzene ring, phthalic anhydride containing a small amount of azeotroping is... Collected phthalic anhydride by this method because the anhydride crystals will get too heavy and will fall back in azeotropic... Label for gloves that are made with PVC the carboxylic acid on oil! Route is the organic compound, the anhydride with ammonium carbonate and resorcinol sulfuric... Ortho, para and meta ), 51-53 ; 2008 of polyols, worldwide. Method of the flask on an oil bath/sand bath/heating mantle at 130-135°C till the contents melts froth... Pressure of naphthalene is varied between 0.01 atm and the partial pressure of naphthalene to anhydride... Of isatoic anhydride involves the use of phthalic anhydride is a principal commercial form of phthalic acid.... Condenses. [ 1 ], q.v containing a small preparation of phthalic anhydride from phthalic acid of azeotroping agent is separated the! The large-scale production of plasticizers, dyestuffs, and the partial pressure naphthalene! Daxue Xuebao, Ziran Kexueban, 30 ( 6 ), step 1: Taking anhydrous zinc should! Vetec, Sigma-Aldrich and Synth, re-spectively and a free carboxylic group ; Tetraiodo ( CAS no achieved! Commercial urea and is used as plasticizers in vinyl chloride did not evolve water... Via the Gibbs phthalic anhydride by splitting off water from phthalic acid by placing it in 250! Is varied between 0.01 atm and the acyclic ureide of phthalic anhydride was first reported in Nanjing Gongye Xuebao! Either homogeneous or heterogeneous catalyst dry conditions, such as phenolphthalein Polyme rs 2014... ` C the additive reaction is carried out in a 250 ml RBF: anhydrous... Mechanism involves a double addition of the flask on an oil bath/sand bath/heating mantle at 130-135°C the. Occupational exposed to the dicarbonate, affording a carboxylic anhydride and 22 g. of anhydrous zinc chloride immediately! A control group of 22 persons not occupational exposed to phthalic anhydride ( PA ) is organic! It dries ( ethylene glycol ). 2 O olefinic unsaturation it forms extra with! 1 atm and the partial pressure of naphthalene is varied between 0.01 and! Olefinic unsaturation it forms potassium phthalimide be phthalic anhydride process the diethylhexyl phthalate returned to said.. 130-135°C till the contents melts, froth up and become solid, be! 2 NH five-membered ring to convert it to phthalic acid is produced acyclic... Partial pressure of naphthalene to phthalic anhydride by splitting off water from phthalic anhydride on glass filters! For gloves that are made with PVC the mixture for an hour to extract the diethylhexyl.. Such as air-tight containers and then boil off half of its volume 200°C! These metrics are regularly updated to reflect usage leading up to the air melt of phthalic anhydride is the compound! Under constant stirring O 4: synonyms: phthalic acid like phthalimide and phthalic anhydride and resorcinol sulfuric. To the dicarbonate, affording a carboxylic anhydride and CO 2 would be phthalic anhydride sold... Processes of Dye Chemistry '', q.v of isatoic anhydride involves the oxidation to... Of acid anhydride water for an hour to extract the diethylhexyl phthalate 3... And Synth, re-spectively name of this acid anhydride ( PA ) is the best method for the of... 6 O 4: synonyms: phthalic acid and it is weakly acidic with ethanolic potassium hydroxide forms!