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Molecular formula : C10H10O4
MW : 194.19
CAS No. :131-11-3
nature : a transparent colorless oily liquid. 0-2 ° C melting point, boiling point of 282 ° C and 210 ° C (13.3kPa), 182.8 ° C (8:30), 147.6 ° C (1.33kPa.Conclusion), the relative density of 1.192 (20 / 4 ° C), 1.5155 refractive index, a flash point of 151 ° C and 154 ° C fire point, viscosity (20 ° C) 22mPa s, vapor pressure (25 ° C) 1.33Pa. With ethanol, ethyl ether immiscibility, soluble in benzene, acetone and other organic solvents and do not dissolve in water and mineral oil. Microstrip aromatic odor.
Preparation : anhydride and excessive (four times) of methanol for Atmospheric esterification, the return of excessive methanol with water, reaction DMP. Anhydride to 600kg, 450kg90-95 ° C methanol, followed 1050ml concentrated sulfuric acid input 11:50, heating return 24h. After completion of the reaction, recovery methanol, which then used sodium carbonate and water washing, then distilled derived products. An industrial goods dimethyl phthalate the purity of �99%. The consumption of raw materials fixed : anhydride 750kg / t, 445kg methanol / t.
purposes : the goods is a wide range of resin has a very strong solution of plasticizers, with a variety of cellulose resins, rubber, vinyl resin compatibility. A good film, adhesive and waterproof. Usually with diethyl phthalate tie for cellulose acetate membrane, varnish, transparent paper and the powder molding production. Few used nitro - cellulose production. The materials may also be used as a plasticizer nitrile rubber, good resistance to cold products. Mix with other plasticizers. Volatile can overcome Japan, such as low-temperature crystal defects. The products are also used to avoid mosquito oil (crude oil) and DDT solvents. The goods are used for GC stationary phase.
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