Add time：2014-11-3 10:54:57 Entry: the station: the original source
Method for preparing glyoxylic acid monohydrate, which belongs to the technical field of fine chemical industry. It consists of L- menthol and a halogen or halogen halogen or two acetyl anhydride reaction generates a halogen or halogen acetic acid two L- menthol ester, then in existence in reaction auxiliary oxidant. The reaction liquid as raw material with a halogen acetic acid L- menthol ester, cooling after dilution, DMSO P2O5 solution and three triethylamine processing, get the glyoxylic acid L- menthol ester; reaction liquid, raw materials for the two Haas L- menthol ester water washing, extraction, concentration to obtain the glyoxylic acid L- menthol ester with sodium bisulfite and formaldehyde treatment of its monohydrate. The present invention by up to 72% of total yield by using the technology of synthesis of glyoxylic acid L- menthol ester can reach more than 80% above, total yield of glyoxylic acid L- menthol ester monohydrate, the purity of more than 99.5%, the technical process is simple, easy to get raw materials, high yield, good product purity and suitable for industrial production.