Trimellitic Anhydride
1,2,4-Benzenetricarboxylic anhydride
CAS: 552-30-7
Molecular Formula: C9H4O5
Trimellitic Anhydride - Names and Identifiers
| Name | 1,2,4-Benzenetricarboxylic anhydride |
| Synonyms | Trimellitic anhydride 4-Carboxyphthalic anhydride BENZENE-1,3,4-TRICARBOXYLICANHYDRIDE 1,2,4-Benzenetricarboxylic anhydride 1,2,4-benzenetricarboxylicacidanhydride 1,2,4-Benzenetricarboxylic acid anhydride 1,2,4-Benzenetricarboxylic acid anhydride-1,2 1,2,4-benzenetricarboxylicacid,cyclic1,2-anhydride 1,3-dioxo-1,3-dihydro-2-benzofuran-5-carboxylic acid 1,2,4-Benzenetricarboxylic acid, cyclic 1,2-anhydride 1,3-dihydro-1,3-dixoxo-5-isobenzofurancarboxylic acid benzene-1,2,4-tricarboxylic acid 1,2-anhydride trimellitic anhydride |
| CAS | 552-30-7 |
| EINECS | 209-008-0 |
| InChI | InChI=1/C9H4O5/c10-7(11)4-1-2-5-6(3-4)9(13)14-8(5)12/h1-3H,(H,10,11) |
| InChIKey | SRPWOOOHEPICQU-UHFFFAOYSA-N |
Trimellitic Anhydride - Physico-chemical Properties
| Molecular Formula | C9H4O5 |
| Molar Mass | 192.13 |
| Density | 1.54 |
| Melting Point | 163-166 °C (lit.) |
| Boling Point | 390 °C |
| Flash Point | 227 °C |
| Water Solubility | DECOMPOSES |
| Solubility | 24.4g/l (decomposition) |
| Vapor Presure | <0.01 mm Hg ( 20 °C) |
| Vapor Density | 6.6 (vs air) |
| Appearance | Flakes |
| Color | White to off-white |
| Exposure Limit | ACGIH: TWA 0.0005 mg/m3; STEL 0.002 mg/m3 (Skin)NIOSH: TWA 0.005 ppm(0.04 mg/m3) |
| Merck | 14,9703 |
| BRN | 9394 |
| pKa | 3.11±0.20(Predicted) |
| PH | 2 (21g/l, H2O, 20℃) |
| Storage Condition | Store below +30°C. |
| Stability | Stable. Moisture sensitive. |
| Sensitive | Moisture Sensitive |
| Explosive Limit | 1-7%(V) |
| Refractive Index | 1.4717 (estimate) |
| Physical and Chemical Properties | Characteristic needle crystal. melting point 168 ℃ boiling point 390 ℃ relative density 1.68 flash point 222 ℃ soluble in hot water and acetone, 2-butanone, dimethylformamide, ethyl acetate, cyclohexanone. Dissolved in anhydrous ethanol and reaction. |
| Use | Used for making polyester resin, polyimide resin, high temperature insulation material, polyvinyl chloride plasticizer, etc |
Trimellitic Anhydride - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R37 - Irritating to the respiratory system R41 - Risk of serious damage to eyes R42/43 - May cause sensitization by inhalation and skin contact. |
| Safety Description | S22 - Do not breathe dust. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. |
| WGK Germany | 1 |
| RTECS | DC2050000 |
| FLUKA BRAND F CODES | 10-21 |
| TSCA | Yes |
| HS Code | 29173980 |
| Toxicity | LD50 orally in Rabbit: > 2730 mg/kg LD50 dermal Rabbit 23000 mg/kg |
Trimellitic Anhydride - Upstream Downstream Industry
| Raw Materials | 1,2,4-Trimethylbenzene |
Trimellitic Anhydride - Nature
Open Data Verified Data
needle crystal. Flammable. Low toxicity. Melting point 168 °c. Boiling point of 390 deg C; 240~245 deg C (1.87kPa). The relative density was 1.68. Flash point 222 °c. Soluble in hot water and acetone, 2 methyl ketone, dimethyl formamide, ethyl acetate, cyclohexanone. Dissolved in anhydrous ethanol and reaction.
Last Update：2024-01-02 23:10:35
Trimellitic Anhydride - Preparation Method
Open Data Verified Data
trimethylbenzene in acetic acid solution, cobalt acetate and manganese acetate as catalyst, liquid phase air oxidation to produce trimellitic acid, and then heated and melted, dehydration to produce trimellitic anhydride, after vacuum distillation, the product is obtained by sublimation and crystallization.
Last Update：2022-01-01 10:44:00
Trimellitic Anhydride - Use
Open Data Verified Data
used in the manufacture of polyester resin and polyimide resin, water-soluble polyester resin, water-soluble polyurethane resin, plasticizer and water-soluble amino alkyd resin, epoxy resin curing agent and advanced aviation lubricating oil, power capacitor impregnating oil, granular Binder, sizing agent, smoke suppressant, instantaneous Binder, etc.
Last Update：2022-01-01 10:44:00
Trimellitic Anhydride - Safety
Open Data Verified Data
- This product is toxic, stimulating the lungs, eyes, nasal mucosa and skin, can cause allergic allergic reactions and other obstacles. Mice with acute oral LD50 5.6 g/kg. The maximum allowable concentration in air is 1mg/m3. The operation site should be well ventilated, and the operator should wear protective masks, protective glasses and relevant protective equipment.
- packaged in a clean and dry plastic drum, sealed with paraffin wax, and stored in a cool, ventilated and dry place to prevent heat, moisture, sun protection, and away from heat sources. According to the provisions of toxic substances storage and transportation.
Last Update：2022-01-01 10:44:01
Trimellitic Anhydride - Reference Information
| LogP | 0.06-0.54 at 20℃ |
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | used to make unsaturated polyester resin, polyimide resin, polyvinyl chloride heat-resistant plasticizer, epoxy resin curing agent, dye, capacitor impregnation oil and adhesive, etc. used to make polyester resin, polyimide resin, high temperature resistant insulating material, polyvinyl chloride plasticizer, etc. 1,2,4-Benzomethyl anhydride was first industrialized by Amoco in the United States in 1962 After the industrial production, with the large-scale ethylene plant, the resources of trimethylbenzene increased, and the product was used as a plasticizer with excellent heat resistance and weather resistance. The raw material, its consumption is also increasing, and 1,2, 4-benzomethyl anhydride shows an increasing trend. Of the total consumption, more than 90% of the product is used for polyvinyl chloride plasticizer dioctyl trimelliate. With the popularization of various electrical products, trimellitic anhydride plasticizers with excellent heat resistance can be used in the heating parts of various electrical products. The product is also used in the manufacture of polyester resin and polyimide resin, water-soluble polyester resin, water-soluble polyurethane resin, water-soluble amino alkyd resin and advanced aviation lubricating oil, power capacitor impregnation oil, pellet binder, sizing agent, smoke suppression agent, instantaneous binder, etc. In the aspects of wire and cable, automobile interior decoration cushion artificial leather, electric washing machine drain hose, shutter curtain, handbag, sealing material and filler, etc., have their application fields. 1,2,4-benzenetrimethylanhydride can also be used as epoxy resin curing agent, heat-resistant insulating laminate, heat-resistant varnish, stabilizer, dye pigment, surfactant, film, and polyacid for water-soluble coatings, etc. |
| Production method | Using 1,2, 4-trimethylbenzene as raw material, it is produced by liquid phase nitric acid oxidation or cobalt (or manganese) catalytic air oxidation. Raw material consumption quota for air oxidation method: 1,2,4-trimethylbenzene (≥ 97%)1000kg/t, acetic acid 800kg/t, cobalt acetate 10kg/t, manganese acetate 7.5kg/t, tetrabromoethane 10kg/t. Uses: 1,2, 4-benzenetrimethylanhydride was first industrialized by Amoco in the United States in 1962 After production, with the large-scale ethylene plant, the resources of trimethylbenzene increased, and the product was used as heat resistance and weather resistance Excellent plasticizer raw material, its consumption is also increasing, and 1,2, 4-benzenetrimethylanhydride shows an increasing trend. Of the total consumption, more than 90% of the product is used for polyvinyl chloride plasticizer dioctyl trimelliate. With the popularization of various electrical products, trimellitic anhydride plasticizers with excellent heat resistance can be used in the heating parts of various electrical products. The product is also used in the manufacture of polyester resin and polyimide resin, water-soluble polyester resin, water-soluble polyurethane resin, water-soluble amino alkyd resin and advanced aviation lubricating oil, power capacitor impregnation oil, pellet binder, sizing agent, smoke suppression agent, instantaneous binder, etc. In the aspects of wire and cable, automobile interior decoration cushion artificial leather, electric washing machine drain hose, shutter curtain, handbag, sealing material and filler, etc., have their application fields. 1,2,4-benzenetrimethylanhydride can also be used as epoxy resin curing agent, heat-resistant insulating laminate, heat-resistant varnish, stabilizer, dye pigment, surfactant, film, and polyacid for water-soluble coatings, etc. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 20:52:54
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Raw Materials for Trimellitic Anhydride