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CAS : 56-40-6
formula : C2H5NO2
molecular weight : 75.07
Melting Point : 245-245 ° C
Chinese name : amino acid; B acid
English title : Aminoacetic acid; 2 - aminoacetic acid; amino-acetic Aci; aminoethanoic acid; glicoamin; Glyphosate (IUPAC abbrev); hampshire glycine; indicative de Gelatine; Aminoethanoec acid; Glycocol; Glycin; mo Aminoessigs α; Gly; α - Glycine; 2 - Amino α thans α mo (α-Form)
nature Description : white monoclinic or hexagonal crystal system, or a white crystalline powder. No foul, a special sweetness. The temperature of 248 ° C (decomposition), the relative density of 1.1607. Water-soluble, and the solubility in water : 25 ° C to 25 g, 100 ml; 50 ° C for 39.1g, 100ml; 75 ° C for 54.4g, 100ml; 100 ° C for 67.2g, 100ml. Extremely difficult to dissolve in ethanol, the ethanol 100g dissolved about 0.06g. Almost insoluble acetone and ether. With the formation of hydrochloric acid hydrochloride.
production methods : 1. Streck (Strecker) Act, formaldehyde and hydrogen cyanide (KCN), and ammonium chloride reaction, acetic acid, methyl-amino acetonitrile of crystallization. The product will be filtered, in the presence of sulfuric acid by adding ethanol break it down, get amino acetonitrile sulfate. Barium before adding to the decomposition of glycine barium salt. Add a certain amount of barium sulfate and filtered quantitative precipitation. To filtrate concentration; Place cooling, precipitated glycine crystallization. 2. A method of chloroacetic acid and ammonium bicarbonate of ammonia mixture heated to 55 ° C, by adding a chloroacetic acid aqueous solution at 55 ° C for 2 h reaction. Heated to more than 80 ° C to remove ammonia, bleaching using activated carbon. Filtration, bleaching solution plus 95% ethanol so glycine crystallization, filtration, ethanol washing, drying in crude. Crude dissolved in hot water, coupled with the re-crystallization of ethanol derived products. The yield of about 42%. 3. Silk from the hydrolysis of 25kg from silk waste, industrial by adding 6N hydrochloric acid tank, 110-120 ° C heating in return 22h, full hydrolysis until Biuret Purple was not far. Hydrolysis after Doubling the volume of water per liter plus 30-40g of powdered activated carbon, stirring at 60 ° C for 30 minutes. Using polyester cloth cylinder filter in the filter impurities in brown hydrolysis about luggage. Using activated carbon adsorption hydrolysis of tyrosine, and then ion-exchange column out of glycine, alanine also be separable; Serine. These production methods, a relatively simple method of chloroacetic acid, in fact, by adding trichloroacetic acid to an ammonia storage tank, at room temperature for a longer period of time can generate glycine. Industrial production, a solution for medium Urotropine, chloroacetic acid with a high concentration of ammonia in 70 ° C2h, methanol (or ethanol) precipitation; With refining availability of glycine white crystals, this method yields up to 92-94%, content of 99%. The consumption of raw materials fixed : a trichloroacetic acid (95%) 1600kg, t; Liquid ammonia 880kg, t; Urotropine Barley, t; Methanol (95%) 1100kg, t. In addition, raw materials for gelatin, hydrolysis; Refining filtration; Drying can be obtained glycine
purposes : the goods in the fertilizer industry for removing carbon dioxide solvents. In the pharmaceutical industry, can be used as amino acids preparation; Aureomycin and as a buffer against menopause drug L-DOPA synthetic materials, is also imidazole ethyl intermediates, which is itself an auxiliary treatment drug, treatable neurological acid to inhibit gastric ulcer acid is effective over . Workers are in the food industry for the synthesis of wine; Brewing products; Meat processing and cold drinks formula and saccharin to-agent, as food additives, glycine can be used alone as a condiment, and can glutamate; DL-alanine, as with the use of citrate. In other industries, as pH regulator, add to the electroplating solution, or used for other amino acids in raw materials. In organic synthesis and biochemistry for biochemical reagents and solvents.
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