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| | Pyromellitic acid Basic information |
| Product Name: | Pyromellitic acid | | Synonyms: | USAF xr-20;1,2,4,5-BenzenetetracarboxyL;benzene-1,2,4,5-tetracarboxylate;1,2,4,5-Benzenetetracarboxylic acid,Pyromellitic acid;1,2,4,5-Benzenetetracarboxylic acid, 96% 100GR;1,2,4,5-Benzenetetracarboxylic acid, 96% 5GR;1,2,4,5-BENZENETETRACARBOXYLIC ACID FOR;Pyrome1htic Acid | | CAS: | 89-05-4 | | MF: | C10H6O8 | | MW: | 254.15 | | EINECS: | 201-879-5 | | Product Categories: | Intermediates of Dyes and Pigments | | Mol File: | 89-05-4.mol |  |
| | Pyromellitic acid Chemical Properties |
| Melting point | 281-284.5 °C(lit.) | | Boiling point | 317.36°C (rough estimate) | | density | 0,56 g/cm3 | | refractive index | 1.7010 (estimate) | | Fp | 325 °C | | storage temp. | Store below +30°C. | | solubility | 0.1 M NaOH: 0.2 M, clear, faintly yellow | | pka | pK1: 1.92;pK2: 2.87;pK3: 4.49;pK4: 5.63 (25°C) | | form | Crystalline Powder | | color | White to very slightly yellow | | Water Solubility | 1.5 g/100 mL (20 ºC) | | Merck | 14,8004 | | Stability: | Stable. Incompatible with strong oxidizing agents, strong bases. | | InChIKey | CYIDZMCFTVVTJO-UHFFFAOYSA-N | | LogP | 0.15 at 25℃ | | CAS DataBase Reference | 89-05-4(CAS DataBase Reference) | | NIST Chemistry Reference | 1,2,4,5-Benzene-tetracarboxylic acid(89-05-4) | | EPA Substance Registry System | 1,2,4,5-Benzenetetracarboxylic acid (89-05-4) |
| | Pyromellitic acid Usage And Synthesis |
| Chemical Properties | White powder.
Absorbs moisture slowly if exposed to atmosphere.
Soluble in alcohol, slightly soluble in water.
| | Uses | Pyromellitic acid (PMA) is mainly used as intermediate for powder coating. Product Data Sheet | | Uses | 1,2,4,5-benzenetetracarboxylic acid is used for the synthesis of the polyimide, pyromellitic octyl, etc., it is the main raw material of matting curing agent. | | Uses | Pyromellitic acid is an eluent used in anion chromatography and forms complexes with magnesium and calcium ions. It is used as a curing agent, as an intermediate for powder coating and a cross-linking agent for alkyd resin. It is involved in the synthesis of polyimide and pyromellitic octyl. | | Definition | ChEBI: A tetracarboxylic acid that is benzene substituted by four carboxy groups at positions 1, 2, 4 and 5 respectively. | | Hazard | Skin irritant, may be carcinogenic.
| | Purification Methods | Dissolve it in 5.7 parts of hot dimethylformamide, decolorise, filter and cool. The precipitate is collected and dried in air. The solvent is removed by heating in an oven at 150-170o for several hours. It also crystallises from water. [Beilstein 9 H 997, 9 IV 3804.] |
| | Pyromellitic acid Preparation Products And Raw materials |
| Raw materials | 1,2,4-Trimethylbenzene-->1,2,4,5-Tetramethylbenzene-->5-Methyl-1,2,4-benzenetricarboxylic acid-->1,2,3,4,5,6,7,8-OCTAHYDROANTHRACENE-->2,4,5-TRIMETHYLBENZALDEHYDE-->2,5-BIS(CHLOROMETHYL)-P-XYLENE-->1,2-Benzenedicarboxylic acid, 4,5-dimethyl--->2,5-DIMETHYLTEREPHTHALIC ACID-->2,4,5-Trimethylbenzoic acid-->1,2,4-Benzenetricarboxylic acid-->Pyromellitic Dianhydride | | Preparation Products | photosensitive polyimide photoresist (PSPI)-->1,2,4,5-TETRACYANOBENZENE-->1,2,4,5-Benzenetetrakis(carbonyl chloride)-->1,2,4,5-BENZENETETRACARBOXAMIDE |
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