Chemical Materials and Intermediates

1,2,4-Trimethyl Benzene
Alias , Pseudocumene
1,2,4－Trimethyl Benzene ; Pseudocumene
Molecule Formula C₉H₁₂

Physical chemical properties: colorless liquid, insoluble in water, soluble in ethanol, aether and benzene. Melting point -44℃, boiling point 168℃.Relative density ( d₄²⁰ ) 0.8758. Refractive index ( n_D²¹ )1.5048. Flash point 48℃. Combustion heat 5206.99 kJ.

Typical Data:

Product applications: This product is a basic organic industrial chemical. It is used to make medicines (Vitamin E), dyes, synthetic resins and hydrogen peroxide. It is also used to make trimellitic anhydride, pyromellitic dianhydride, soluble alkide resins, unsaturated polyester resins, plasticizers,ethoxyline resin solidifying agents and surfactants.

Manufacture method: It is isolated from the C9-C10 aromatic hydrocarbons that are produced by catalytic reforming and splitting of naphtha. The pseudocumene content of reformed aromatic hydrocarbons is as high as over 40%. Fractional distillation will produce pure product of 99% or more.

Toxicity and protection: This product is toxic and it irritates mucous membrane and central nerves. Avoid contact.

Packaging, storage and transportation: This product is flammable and explosive and should be stored in oil cans, tank trucks or iron barrels which meet the requirement of inspection regulations. Taking expansion into consideration, safety space should be allocated according to temperature variations. Never completely fill the container. Fire should be strictly prohibited during storage and transportation and related fire control regulations should be observed. Adequate fire control equipments should be prepared.

1,3,5一Trimethyl benzene
1,3,5－Trimethyl benzene
C₉H₁₂

Physical chemical properties: Colorless transparent liquid.Melting point α-type -45℃；β-type 51℃. Boiling point 164.7℃. Relative density( d₄²⁰ )0.864. Refractive index ( n_d²¹ )1.4994. Flash point 44℃. self-igniting point 550℃. Insoluble in water, soluble in ethanol. Soluble in benzene, aether,acetone with any ratio.

Typical Data:

Product Applications: 

It is a raw material for organic synthesis. It is used to make 1,3,5-Benzene Tricarboxylic Acid , antioxidant, ethoxyline resin solidifying agent, polyester resin stabilizer, and alkide resin plasticizer. It is used to produce 2,4,6-trimethylaniline for making such dyes as active cobalt blue and K-3R.

Manufacture method: Distill heavy aromatic hydrocarbons to obtain pseudocumene. At the same time, isomerize highly pure 1,2,4－Trimethyl Benzene to 1,3,5－trimethyl benzene. Then fraction distillation is performed to isolate1,3,5－trimethyl benzene from  the reaction oil.

Toxicity and protection: Its toxicity is similar to dimethylbenzene.It irritates the nose and the throat. The highest permitted concentration in air is 125mg/m³. The operation spot should be well ventilated and the operators should wear protection masks.

Packaging, storage and transportation: Fire and insolation should be avoided during storage. It should be separated from oxidants. It should be handled with care to avoid breaking the package. Securely sealed iron barrel no thinner than 1.2mm can be used to pack the product and each barrel should not exceed 200kg. If it is packed in plastic barrels or glass bottles, securely seal the containers before put into wood cases, which should be securely lined inside with inflammable materials and tightly tied outside with iron wires or iron sheets. Each case should not exceed 50kg and be marked with "flammable".