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Chloroacetic Acid Is An Important Organic Chemical Raw Materials

Shandong Minji Chemical Co.,Ltd | Updated: Oct 27, 2017

Also known as chloroacetic acid is colorless or white crystal, easy deliquescence. The relative density of 1.580 (20/20 ℃), the melting point of 63 ℃, the boiling point of 189 ℃. Soluble in water, soluble in ethanol, ether, benzene, chloroform. Strong corrosive, can damage the metal, Monochloroacetic Acid rubber and cork and so on. Colorless or white crystal, easy deliquescence. The relative density of 1.580 (20/20 ℃), the melting point of 63 ℃, the boiling point of 189 ℃. Soluble in water, soluble in ethanol, ether, benzene, chloroform.

Chloroacetic acid, also known as a chloroacetic acid, chloroacetic acid, usually written as MCA or MCAA. The formula is ClCH2 COOH, MW94 5 0. It is a colorless crystalline solid, Monochloroacetic Acid there are four crystalline forms, α, β, γ, δ. The crystallization of the four crystals is not the same, only the alpha crystal form is stable. Industrial MCA is composed of α form, boiling point pressure 180 ℃. Chloroacetic acid containing chlorine and carboxyl two functional groups, the substituent chlorine is electronically, Monochloroacetic Acid so monochloroacetic acid is stronger than acetic acid. The carboxyl group can react with the base to form a salt, react with the alcohol to produce various esters, and some acylating agent reaction to produce chloroacetyl chloride. Chloroacetic acid α - carbon atoms have a chlorine, but also can produce dichloro, trichloroacetic acid, more acidic. The chlorine atom can be replaced by a hydroxyl group to produce glycolic acid, which is an important raw material for fine chemicals. Monochloroacetic Acid Chlorine atoms are replaced by amino groups to generate various amino acids. Chlorine atoms are replaced by cyano groups to form cyanoacetic acid, which has important applications in dyes, pharmaceuticals, adhesives and so on. The chlorine atom may be substituted with phenolic hydroxyl to form various carboxymethylphenylene ethers. Chlorine atoms are replaced by mercapto to form thioglycolic acid, which is the most important ingredient in cold syrup.

Chloroacetic acid is a pharmaceutical, pesticide, dyes and other products important chemical raw materials. The content of monochloroacetic acid and the determination of the content of impurity dichloroacetic acid are usually used for capacity titration. Because of the analysis steps, the analysis time is long, Monochloroacetic Acid the quantitative analysis of the finished product, especially the quantitative analysis of the control process, can not play a quick and effective role, and the change can not be compared before and after the improvement of product quality is not a small impact. In order to find a shorter, more accurate analytical method, Monochloroacetic Acid we propose the following method according to the experiment. In this method, the standard sample of chloroacetic acid is esterified simultaneously with the tested sample, and quantified by gas chromatography calibration area normalization method. It is suitable for the quality inspection of the finished product and the quality control analysis in the production process.

Chloroacetic acid is an important organic chemical raw materials. With the development of domestic synthetic industry and the international market development, the production and quality of chlorinated acetic acid put forward new requirements. And the improvement of quality has become the future to be quickly resolved the key. International market demand for a large amount of chlorinated acetic acid, Monochloroacetic Acid but because of China's first grade of a chloroacetic acid standard: a chloroacetic acid content of 96.5%, dichloroacetic acid 0.5%. While the Japanese standard content of 99% and respectively. .5%, it is understood that the international community does not contain 96.5% of the standard of monochloroacetic acid products. China's low content of chlorinated acetic acid, seriously affecting the export and exchange capacity, therefore, must solve the quality problem. According to international standards of production, as the future development of the key issues. Domestic current level of production of chloroacetic acid is low, Monochloroacetic Acid the total output of 2 to 3 million tons, more than 20 production plants. General production plants are using acetic acid chlorination method, the method to sulfur as a catalyst, the main process of chlorination, crystallization and pumping three links. In the acetic acid chlorination in the production of 2 to 10% of the dichloroacetic acid, Monochloroacetic Acid and unreacted acetic acid, filtration separation process, the air and the water and lead to a chloroacetic acid crystals lead to low content of finished products.

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