Pure lactic acid is a colorless liquid, is a colorless to pale yellow liquid. Odorless, hygroscopic. The relative density of 1.2060 (25/4 ℃). Melting point 18 ℃. Boiling point 122 ℃ (2kPa). Refractive index nD (20 ℃) ??1.4392. With water, ethanol, glycerin, insoluble in chloroform, carbon disulfide and petroleum ether. Heating under normal pressure, concentrated to 50%, part of the anhydride into milk, thus products often contain 10% -15% of the milk anhydride.
2013年8月2日星期五
D-lactic acid with a monocarboxylic typical chemical properties
D-lactic acid with a monocarboxylic typical chemical properties of a weak acid solution, the concentration of more than 50% portion is formed when milk Calcium lactate the reaction of alcohols with some alkyd resin, the heating conditions can be intermolecular potassium lactate to form lactic acid lactylate (C6H10O5), heating may be further diluted and hydrolyzed to D-lactic acid. Role of zinc oxide in the dehydrating agent, the removal of two molecules of two molecules of D-lactic acid in water, to form a cyclic dimer from poly D-lactide (C6H8O4, DLA). Sufficiently dehydrated D-lactic acid polymer can be formed. The more concentrated the acid esterification stronger the trend itself, thus lactic acid and lactic acid is typically a mixture of lactide.
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