Mesitylene 108-67-8 product presentation

Product name:Mesitylene
Cas No.:108-67-8
Molecular formula:C9H12
Molecular weight:120.192
Density: 0.867g/cm3
Melting point: -45℃
Boiling point: 163-166℃
Flash point: 43℃
Refractive index: 1.499 (20℃)
Vapor pressure: 2.32mmHgat25°C
Appearance: Colorless liquid
Solubility: Insoluble in water, soluble in ethanol, ether, benzene.
Mesitylene chemical structural formula:

Mesitylene Description:
Trimethylbenzene, also known as 1,3, 5-trimethylbenzene, has a molecular structure of benzene ring C atoms form σ bonds with sp2 hybridized orbitals, and other C atoms form σ bonds with sp3 hybridized orbitals. It is a functional group that exists in many organic compounds. It is an aromatic hydrocarbon obtained by symmetrically substituting three hydrogens on the benzene ring with three methyl groups. It is widely found in coal tar and certain petroleum chemicals. It is a colorless liquid, poisonous, flammable and explosive. 1, 3, 5-benzoic acid can be obtained by the oxidation of mesitylene with dilute nitric acid. Pure mesitylene was prepared by gas phase catalytic dehydration of acetone at 300-500 ℃.

All the test performed according to the spec as follows:

Main uses:
Organic synthetic raw material, used to produce trimeric acid, as well as antioxidants, epoxy resin curing agent, polyester resin stabilizer, alkyd resin plasticizer, to produce 2,4, 6-tritoluine for the production of reactive brilliant blue, K-3R and other dyes.
Used as an analytical reagent, solvent, and also for organic synthesis.
Storage method:
Store in a cool, ventilated warehouse. Keep away from fire and heat. Should be stored separately from oxidizer, do not mix storage. Explosion-proof lighting and ventilation facilities are adopted. Do not use mechanical equipment and tools that are prone to spark. The storage area should be equipped with leak emergency treatment equipment and suitable containment materials.
Stability:
1. 3-methylisophthalic acid and trimeric acid are produced by oxidation of potassium permanganate. The 1,3, 5-trimethylbenzene is boiled with chlorine gas to produce ω-chloro-trimethylbenzene and ω-ω-dichloro-trimethylbenzene. Boiling with aluminum trichloride, the methyl group moves to form m-xylene, 1,2,3, 5-tetratoluene, 1,2,4, 5-tetratoluene and a small amount of benzene, toluene, 1,2, 4-tritoluene, etc.
2. The toxicity intensity is the same as xylene. Irritates nose and throat, causes pneumonia, damages nervous system and liver contact skin can degrease it. When the air concentration (7000 ~ 9000) ×10-6, the mice can stop reflexes. The maximum allowable concentration in air is 125mg/m3. The operation site should be well ventilated, and the operator should wear protective equipment.
3. Exists in smoke.
Production method:
1. Obtained by separation of C9 aromatics. 2. The trimethylbenzene in the reformed heavy aromatics is about 11.8%. However, because its boiling point (164.7℃) is very close to the boiling point of o-methyl ethyl benzene (165.15℃), it is difficult to separate by distillation. 3. With the isomerization method of tritylene as raw material, the yield of 1,3, 5-tritylene obtained by fractiation is 21.6%, the purity is more than 95%, and the by-products are 4%-7% tetramethylbenzene and 9% xylene. The average temperature of the reactor bed was 260℃, the pressure was 2.35MPa, the air conditioning was 1.0h-1, the molar ratio of reforming hydrogen to oil was 10:1, and the catalyst was aluminum-deficiency hydrogen mercerite: copper: nickel: binder = 85.2:0.5:15. Under these conditions, the conversion rate of metatoluene was 46%, the selectivity was 47%, and the yield of metatoluene was 21.6%. Japanese Chemicalbook Mitsubishi Gas Company used HF-BF3 to separate and isomerize xylene, and the byproduct contains high boiling substance with high concentration of 1,3, 5-trimethylbenzene, which can be obtained by distillation. 4. Acetone can be synthesized by dehydration under sulfuric acid catalysis with a yield of 13%-15%. 4600g (79mol) of industrial acetone was cooled to 0-5℃, and 4160ml of concentrated sulfuric acid was added under stirring at a temperature not exceeding 10℃. The casket is stirred for 3-4h and left at room temperature for 18-24h. The product was distilled by steam to separate 1,3, 5-tritylene, then washed with alkali and water, then distilled and collected 210℃ distillate. 15g sodium metal was added to this distillate, heated to near boiling point, 2/3 of the liquid was steamed, and the remaining substance was distilled to 210℃. Then 163-167℃ distillate was collected by efficient fractation. It’s 430-470g1,3, 5-tritylene.