Molecular formula : C2H3ClO2
MW : 94.50
CAS No. :79-11-8
nature : colorless or pale yellow crystal, irritating odor, easy deliquescence, is highly corrosive, skin corrosion can undermine all non-precious metals, rubber and timber. Dissolved in water and alcohol, ether, etc. Most organic solvents. Four crystals (α, β, γ and δ type). The temperature 63 ° C (α), and 56.2 ° C (β), 52.5 ° C (γ), 42.75 ° C (δ), 187.85 ° C boiling point, viscosity 1.29, relative density of 1.4043 ( 40 / 4 ° C), the refractive index of 1.4330. Acetic acid than strong,
Preparation : Industrial production Chloroacetate there are three main ways. (1) is the acid chloride in iodine, phosphorus, sulfur, phosphorus and sulfur, or halides such as the presence of catalysts, will use chlorine acid chloride directly derived. In addition to generating chloroacetic acid, there is the depth of chlorinated by-products such as dichloroacetic acid, trichloroacetic acid. This method consumes less raw materials, simple process, chloroacetic acid production rate up to 92%. (2) TCE legitimate water is 93% of the sulfuric acid as the catalyst, the reaction temperature is about 160-180 ° C. This method may be high purity of chloroacetic acid, the yield is about 90%, but more-product hydrochloric acid. (3) Effects of ethanol oxidation method is used at 60 ° C in 60% nitric acid oxidation, chloroacetic acid yield of over 90%. The acid chloride in North America are based in Western Europe to TCE legitimate water main. China's use of acetic acid chloride production : quantitative 11:50 acetic acid by adding to the weight of acetic acid 3.5% sulfur powder catalyst, preheat to above 90 ° C, start the appropriate amount of chlorine into, Series 2 11:50 Unicom chlorine, the main boiler control temperature of 98 ± 2 ° C, vice pan for 85-90 ° C, chlorine speed of about 70kg / h, the reaction pot materials to be the relative density of 1.350 (80 ° C), the reaction is to reach the terminal. Will pumping reaction to the acid tank, cooling crystallization of a small amount of liquid acid, dichloroacetic acid, and a small amount of sulfur chloride chloroacetic acid, isolated crystals and at 38 ° C below put liquor finished pumping shall do. Ton products generated about 150 kilograms of liquor, made two further chloroacetic acid chloride, dichloroacetic acid and methyl chloroform. TCE water legitimate simultaneously Addition and water hydrolysis : 160-180 ° C reaction temperature, the reaction of sulfuric acid concentration should be maintained at 93%, control TCE and water ratio. Sulfuric acid consumption does not exceed 50kg, vice-30% hydrochloric acid 2.57t. Chloroacetic acid for industrial somewhat colorless or pale yellow crystal. Fixed consumption of raw materials : glacial acetic acid (98%) 730kg / t, chlorine 860kg / t, sulfur by 26 kg / t.
purposes : for a wide range of organic chemicals. The industrial dye used in the production of indigo, naphthalene amino acid dye; In the pharmaceutical industry for the synthesis of caffeine, phenobarbital, epinephrine, vitamin B6, amino acid, malonic ester such as drugs and intermediates; The pesticide industry for the production of herbicide 2,4-D, n-butyl, 2,4,5-T, Thiocyanate acid, α - NAA, the Roundup, alachlor, acetochlor, butachlor and pesticides Rogor 20 multiple pesticide; the synthetic fiber industry for the production of carboxymethyl cellulose (CMC) and nonferrous metal flotation agent Z - # 200, are also used for chromatographic analysis reagents, but also can be used for food additives, detergents, perm lotion products. See Schedule Chloroacetate this series.
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