528-44-9
1,2,4-benzenetricarboxylic acid
CAS: 528-44-9
Molecular Formula: C9H6O6
528-44-9 - Names and Identifiers
| Name | 1,2,4-benzenetricarboxylic acid |
| Synonyms | Trimellitic Acid BENZENETRICARBOXYLICACID benzene-1,2,4-tricarboxylate 1,2,4-benzenetricarboxylic acid Benyop- 1,2,4-Tricarboxybenzene benzene-1,2,4-tricarboxylic acid 1-2-4-BENZENETRICARBOXYLIC ACIDCRYSTALLI NE Benzene-1,2,4-tricarboxylic acid, Trimellitic acid 1,2,4-Benzenetricarboxylic acid,Benzene-1,2,4-tricarboxylic acid, Trimellitic acid |
| CAS | 528-44-9 |
| EINECS | 208-432-3 |
| InChI | InChI=1/C9H6O6/c10-7(11)4-1-2-5(8(12)13)6(3-4)9(14)15/h1-3H,(H,10,11)(H,12,13)(H,14,15)/p-3 |
| InChIKey | ARCGXLSVLAOJQL-UHFFFAOYSA-N |
528-44-9 - Physico-chemical Properties
| Molecular Formula | C9H6O6 |
| Molar Mass | 210.14 |
| Density | 1.4844 (rough estimate) |
| Melting Point | 229-231 °C (dec.) (lit.) |
| Boling Point | 309.65°C (rough estimate) |
| Flash Point | 273.6°C |
| Water Solubility | 2.1 G/100 ML (25 ºC) |
| Solubility | 2.1g/l |
| Vapor Presure | 4.85E-11mmHg at 25°C |
| Appearance | Crystalline Powder |
| Color | White |
| Merck | 14,9702 |
| BRN | 2214815 |
| pKa | pK1: 2.52;pK2: 3.84;pK3: 5.20 (25°C) |
| Storage Condition | Sealed in dry,Room Temperature |
| Refractive Index | 1.6630 (estimate) |
| MDL | MFCD00002470 |
| Physical and Chemical Properties | Also known as benzene three acid. White crystals. Melting point 238 °c. Soluble in ethanol. Insoluble in benzene, chloroform, acetone, ethyl acetate. Slightly soluble in carbon tetrachloride. Dehydration to anhydride. |
| Use | Mainly used in the preparation of synthetic resins, plasticizers, adhesives, etc. |
528-44-9 - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S37/39 - Wear suitable gloves and eye/face protection |
| WGK Germany | 2 |
| RTECS | DC1980000 |
| TSCA | Yes |
| HS Code | 29173990 |
| Hazard Note | Irritant |
528-44-9 - Upstream Downstream Industry
| Raw Materials | 1,2,4-Trimethylbenzene |
528-44-9 - Introduction
Soluble in ethanol and dimethylformamide, soluble in acetone, slightly soluble in water and ethyl acetate, almost insoluble in benzene, chloroform and carbon disulfide.
Last Update：2022-10-16 17:25:54
528-44-9 - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | preparation of trimellitic anhydride and trimellitic acid ester for resins, plasticizers, dyes, adhesives, etc. It is mainly used to make synthetic resins, plasticizers, adhesives, etc. |
| production method | using trimethylbenzene (1,2, 4-trimethylbenzene) as raw material, it is obtained by nitric acid oxidation or potassium permanganate oxidation or liquid phase air oxidation. 1. The first step of nitric acid oxidation: the molar ratio of trimethylbenzene to nitric acid is 1:2.16, the concentration of nitric acid is 17%, the reaction temperature is 200 ℃, and the reaction pressure is about 3.9MPa or less. The second step is oxidation: the molar ratio of trimethylbenzene to nitric acid is 1:4.5, the concentration of nitric acid is 50%, the reaction temperature is 180 ℃, and the reaction pressure is below 3.9MPa. The trimelinic acid mother liquor obtained by the reaction is cooled, crystallized, centrifuged, washed and dried. The yield is over 55%. 2. The potassium permanganate oxidation method uses trimethylbenzene with purity as the 95% as the raw material, in the presence of 20-30 times of water, and oxidizes with potassium permanganate at a temperature of 90-95 ℃, and the obtained product is acidified, recrystallized, Drying to obtain white needle-like crystals. |
Last Update：2024-04-10 22:29:15
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Raw Materials for 528-44-9