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7月30日星期二
acrylonitrile Method
Acrylonitrile and acrylonitrile method is ferrous lactate in sulfuric acid fed to the reactor, and then hydrolysis reactor anyone to esterification reaction with methanol; then after separation of the hydrogen sulfate, calcium lactate distillation column, the bottom is Fine ester; then refined into a second distillation column ester, thermal decomposition, bottom too thin lactic acid, concentrated by vacuum to obtain the product.
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