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Terephthalic acid

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Company Name: Capot Chemical Co.,Ltd.
Tel: +86 (0)571-855 867 18
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Purity:98%(Min,HPLC) Package:100g;1kg;5kg,10kg,25kg,50kg
Company Name: Mainchem Co., Ltd.
Tel: +86-0592-6210733
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Company Name: Hefei TNJ Chemical Industry Co.,Ltd.
Tel: 86-0551-65418684 18949823763
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Purity:99.9% Package:1KG;5USD
Company Name: career henan chemical co
Tel: +86-371-86658258
Products Intro: Product Name:Terephthalic acid
Purity:99% Package:1KG;20USD
Company Name: Changzhou Ansciep Chemical Co., Ltd.
Tel: +86 519 86305871
Products Intro: Product Name:Terephthalic acid
Purity:0.99 Package:100g, 500g, 1kg, 25kg, 50kg, 200kg

Lastest Price from Terephthalic acid manufacturers

  • Terephthalic acid
  • US $20.00 / KG
  • 2019-07-06
  • CAS:100-21-0
  • Min. Order: 1KG
  • Purity: 99%
  • Supply Ability: 100kg
Terephthalic acid Basic information
Product Name:Terephthalic acid
Synonyms:Terephthalic acid 98%;Terephthalic a;Terephthalicacid (7CI,8CI);Terephthalic acid Vetec(TM) reagent grade, 98%;1,4-dicarboxybenzene;1,4-phthalicacid;Acide terephtalique;acideterephtalique
Product Categories:Pyridines
Mol File:100-21-0.mol
Terephthalic acid Structure
Terephthalic acid Chemical Properties
Melting point 300 °C
Boiling point 214.32°C (rough estimate)
density 1,51 g/cm3
vapor pressure <0.01 mm Hg ( 20 °C)
refractive index 1.5100 (estimate)
Fp 260°C
storage temp. 0-6°C
solubility 15mg/l (experimental)
pka3.51(at 25℃)
form Crystalline Powder
color White
Water Solubility slightly soluble in water (0,017 g/L at 25°C)
Merck 14,9162
BRN 1909333
Stability:Stable. Combustible. Incompatible with strong oxidizing agents.
CAS DataBase Reference100-21-0(CAS DataBase Reference)
Safety Information
Hazard Codes Xi
Risk Statements 36/37/38
Safety Statements 26-36
WGK Germany 3
RTECS WZ0875000
Autoignition Temperature925 °F
HS Code 2917 36 00
ToxicityLD50 orally in Rabbit: > 6400 mg/kg
MSDS Information
ACROS English
SigmaAldrich English
ALFA English
Terephthalic acid Usage And Synthesis
DescriptionTerephthalic acid is the organic compound with formula C6H4(COOH)2. This colourless solid is a commodity chemical, used principally as a precursor to the polyester PET, used to make clothing and plastic bottles. Several million tones are produced annually. It is one of three isomeric phthalic acids.
Chemical PropertiesTerephthalic acid is poorly soluble in water and alcohols, consequently up until around 1970 most crude terephthalic acid was converted to the dimethyl ester for purification. It sublimates when heated.
Chemical PropertiesTPA is a white crystalline solid.
Chemical Propertieswhite powder
UsesTerephthalic acid is a benzenepolycarboxylic acid with potential anti-hemorrhagic properties.
Uses1,4-benzenedicarboxylic acid is mainly used for the production of poly (ethylene terephthalate). Also production of plasticizer dioctyl phthalate (DOTP) and polyester plasticized agents. 1,4-benzenedicarboxylic acid and polyhydric alcohols have a condensation reaction withd iethylene glycol, triethylene glycol, glycerol, propylene glycol, butylene glycol, etc. preparation of the polyester plasticizer.
DefinitionChEBI: A benzenedicarboxylic acid carrying carboxy groups at positions 1 and 4. One of three possible isomers of benzenedicarboxylic acid, the others being phthalic and isophthalic acids.
ApplicationVirtually the entire world's supply of terephthalic acid and dimethyl terephthalate are consumed as precursors to polyethylene terephthalate (PET). World production in 1970 was around 1.75 million tones. By 2006, global purified terephthalic acid (PTA) demand had exceeded 30 million tonnes.
There is a smaller, but nevertheless significant, demand for terephthalic acid in the production of poly butylene terephthalate and several other engineering polymers.
Production MethodsTerephthalic acid is produced by oxidation of p-xylene by oxygen in air:
This reaction proceeds through a p-toluic acid intermediate which is then oxidized to terephthalic acid. In p-toluic acid, deactivation of the methyl by the electron withdrawing carboxylic acid group makes the methyl one tenth as reactive as xylene itself, making the second oxidation significantly more difficult . The commercial process utilizes acetic acid as solvent and a catalyst composed of cobalt and manganese salts, with a bromide promoter.
General DescriptionWhite powder.
Air & Water ReactionsInsoluble in water.
Reactivity ProfileTerephthalic acid is a carboxylic acid. Terephthalic acid donates hydrogen ions if a base is present to accept them. This "neutralization" generates substantial amounts of heat and produces water plus a salt. Insoluble in water but even "insoluble" carboxylic acids may absorb enough water from the air and dissolve sufficiently in Terephthalic acid to corrode or dissolve iron, steel, and aluminum parts and containers. May react with cyanide salts to generate gaseous hydrogen cyanide. Will react with solutions of cyanides to cause the release of gaseous hydrogen cyanide. Flammable and/or toxic gases and heat are generated by reaction with diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides. React with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), to generate flammable and/or toxic gases and heat. Reaction with carbonates and bicarbonates generates a harmless gas (carbon dioxide) but still heat. Can be oxidized by strong oxidizing agents and reduced by strong reducing agents. These reactions generate heat. May initiate polymerization reactions; may catalyze (increase the rate of) chemical reactions.
Fire HazardFlash point data for Terephthalic acid are not available. Terephthalic acid is probably combustible.
Safety ProfileModerately toxic by intravenous and intraperitoneal routes. Mildly toxic by ingestion. An eye irritant, Can explode during preparation. When heated to decomposition it emits acrid smoke and irritating fumes.
Potential ExposureTPA is used primarily in the production of polyethylene terephthalate polymer for the fabrication of polyester fibers and films. A high-volume production chemical in the United States.
Purification MethodsPurify the acid via the sodium salt which, after crystallisation from water, is re-converted to the acid by acidification with mineral acid. Filter off the solid, wash it with H2O and dry it in a vacuum. The S-benzylisothiuronium salt has m 204o (from aqueous EtOH). [Beilstein 9 IV 3301.]
IncompatibilitiesCombustible; dust may form an explosive mixture with air. Compounds of the carboxyl group react with all bases, both inorganic and organic (i.e., amines) releasing substantial heat, water and a salt that may be harmful. Incompatible with arsenic compounds (releases hydrogen cyanide gas), diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides (releasing heat, toxic and possibly flammable gases), thiosulfates and dithionites (releasing hydrogen sulfate and oxides of sulfur). Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides.
Waste DisposalDissolve or mix the material with a combustible solvent and burn in a chemical incinerator equipped with an afterburner and scrubber. All federal, state, and local environmental regulations must be observed.
Tag:Terephthalic acid(100-21-0) Related Product Information
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