均苯四甲酸酐
1,2,4,5-Benzenetetracarboxylic anhydride
CAS: 89-32-7
Molecular Formula: C10H2O6
均苯四甲酸酐 - Names and Identifiers
均苯四甲酸酐 - Physico-chemical Properties
| Molecular Formula | C10H2O6 |
| Molar Mass | 218.12 |
| Density | 1,68 g/cm3 |
| Melting Point | 283-286°C(lit.) |
| Boling Point | 397-400°C(lit.) |
| Flash Point | 380 °C |
| Water Solubility | decomposes |
| Solubility | Soluble in dimethyl sulfoxide, acetone, chloroform, ethyl ether, n-hexane and benzene. |
| Vapor Presure | 0Pa at 25℃ |
| Appearance | Fine Powder |
| Color | White to pale yellow |
| BRN | 213583 |
| pKa | 5.45[at 20 ℃] |
| Sensitive | Moisture Sensitive |
| Refractive Index | 1.6000 (estimate) |
| Physical and Chemical Properties | Properties White yellowish lump powder solid crystal soluble in dimethyl sulfoxide, dimethyl formamide, acetone. |
| Use | Used in the preparation of polyimide resin, high temperature resistant electrical insulation paint, PVC plasticizer, synthetic resin crosslinking agent and epoxy resin curing agent, also used in the preparation of phthalocyanine blue dye |
均苯四甲酸酐 - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R41 - Risk of serious damage to eyes R42/43 - May cause sensitization by inhalation and skin contact. |
| Safety Description | S22 - Do not breathe dust. S24 - Avoid contact with skin. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection |
| WGK Germany | 1 |
| RTECS | DB9300000 |
| FLUKA BRAND F CODES | 10-21 |
| TSCA | Yes |
| HS Code | 29173980 |
均苯四甲酸酐 - Upstream Downstream Industry
| Raw Materials | 1,2,4,5-Tetramethylbenzene |
均苯四甲酸酐 - Nature
Open Data Verified Data
white powder. Melting point 286 °c. Boiling point 384~400 deg C. The relative density was 1. 680. Dissolved in dimethyl sulfoxide, dimethyl formamide, acetone, when exposed to humid air, hydrolysis to produce acid.
Last Update：2024-01-02 23:10:35
均苯四甲酸酐 - Preparation Method
Open Data Verified Data
There are four Toluene oxidation method and trimethylbenzene isopropyltrimethylbenzene by isopropylation of isopropyltrimethylbenzene oxidation method, and the four Toluene oxidation method. Including gas phase method and liquid phase method. Gas phase method is to make air and mesitylene together through a fixed bed tubular reactor, in the presence of catalyst V2 05 in 350~500 ℃ catalytic oxidation reaction, the crude anhydride, can be used for distillation, sublimation or recrystallization of refined products. The liquid phase method is in acetic acid solution, with Co, Mn, Cr as catalyst, bromide as cocatalyst, at 160~230 ℃, 0.7~3. Under the condition of 5MPa, the air was oxidized.
Last Update：2022-01-01 10:44:03
均苯四甲酸酐 - Use
Open Data Verified Data
It is used for producing a polyimide resin, which is used as a raw material of a high-temperature resistant electrical insulating paint. It is also used to prepare epoxy resin curing agent and plasticizer, urea formaldehyde resin stabilizer, phthalocyanine blue dye, corrosion inhibitor, instant adhesive, electronic photography Toner, etc.
Last Update：2022-01-01 10:44:02
均苯四甲酸酐 - Safety
Open Data Verified Data
- This product is toxic, mice oral LD50300mg/kg. Can stimulate the mucous membrane and skin, causing allergic and allergic reactions and other obstacles, attached to the skin, the application of soap water rinse. Operators should wear protective masks and glasses.
- packed in brown glass bottles or plastic barrels, covered with paraffin wax to prevent moisture absorption. Store in a cool and dry place, heat, sunscreen, away from heat sources, according to the provisions of toxic substances storage and transport.
Last Update：2022-01-01 10:44:03
均苯四甲酸酐 - Reference Information
| LogP | -2.03 at 21.5℃ |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Introduction | The English name of Pyromellitic Dianhydride (abbreviated as PMDA, the same below) is mainly used to synthesize polyimide, because of its excellent heat resistance, acid and alkali resistance, excellent mechanical properties, electrical properties and dimensional stability, polyimide is widely used in aviation, aerospace, microelectronics and atomic energy and other high-tech fields. |
| Application | pyromellitic dianhydride (PMDA) is an important raw material for organic synthesis industry, it is also the basic raw material for the development of new chemical materials and high value-added fine chemical products. It is mainly used for the production of polyimide monomer, and can also be used as a curing agent for epoxy resin and a crosslinking agent for polyester resin, it is widely used in the manufacture of phthalocyanine blue dyes and some important derivatives. Pyromellitic dianhydride, also known as Homo-anhydride, has a special molecular structure and can be used to make materials with heat resistance, electrical insulation and chemical resistance, among which the most important use is as a monomer of polyimide, polyimide plastic is synthesized with aromatic diamine, but the purity of pyromellitic dianhydride is required to be more than 99%. |
| Use | is used in the manufacture of polyimide resins, which are used as raw materials for high-temperature resistant electrical insulating paints. It is also used to prepare epoxy resin curing agent and plasticizer, urea formaldehyde resin stabilizer, phthalocyanine blue dye, corrosion inhibitor, instantaneous Binder, electronic photography Toner, etc. pyromellitic anhydride and its derivatives have a wide range of uses. PMDA is mainly used as epoxy resin curing agent, polyimide raw materials, polyester resin cross-linking production of benzene type Polyether imide resin, which is a continuous long-term use in 2600C high temperature engineering materials. used in the manufacture of polyimide film, polyimide resin, powder coating matting agent, Advanced Electrical insulating materials The main raw materials used in the manufacture of polyimide heat-resistant engineering plastics and insulating films; can be used as epoxy resin curing agent, stabilizer and synthetic raw materials such as dyes for the preparation of polyimide resin, high temperature resistant electrical insulation paint, PVC plasticizer, synthetic resin crosslinking agent and epoxy resin curing agent, also used in the preparation of phthalocyanine blue dyes, such as |
| production method | there can be a variety of methods. The starting material used may be xylene, trimethylbenzene, tetramethylbenzene or anthracene. The oxidation methods include liquid phase method and gas phase method. 1. The gas phase oxidation of toluene is characterized by simple process, which can save the dehydration to anhydride process, and does not use other oxidants (such as nitric acid, permanganate, chromic acid, etc.) except air, it also does not need the necessary liquid phase catalyst separation process, and can be continuous production, easy to realize automatic operation, is the main method of foreign development. The starting material used can also be alkylated with propylene in the presence of a catalyst, starting from 1,2, 4-trimethyl-5-propylbenzene, then pyromellitic dianhydride was obtained by gas-phase Air catalytic oxidation. 2. From xylene (p-xylene or m-xylene) by chloromethylation, oxidation, cyclization and derived. Industrial pyromellitic dianhydride is white to light yellow-green crystal, the first grade product melting point of 284-287 ℃, the second grade product melting point of 283.5-287 ℃. When produced by oxidation of 1,2, 4-trimethylbenzene, 3000kg of 1,2, 4-trimethylbenzene and 1200kg of propylene were consumed per ton of product. |
| category | toxic substances |
| toxicity grade | poisoning |
| Acute toxicity | oral-rat LD50: 2250 mg/kg; Oral-mouse LD50:2400 mg/kg |
| flammability hazard characteristics | flammable in case of open flame; High heat releases toxic gas |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; It is stored separately from the oxidant |
| extinguishing agent | dry sand, dry talc, carbon dioxide, dry powder. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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Raw Materials for 均苯四甲酸酐