公开(公告)号：JPS63290840A

公开(公告)日：1988-11-28

申请号：JP12570987

申请日：1987-05-25

Applicant: MITSUI TOATSU CHEMICALS

Inventor： HEN PARAA ,  KASUGA TAKAHARU ,  ONO HIROSHI ,  IWAMOTO EIJU

IPC: C07C59/08 ,  C07C51/00 ,  C07C51/367 ,  C07C67/00

Abstract: PURPOSE:To economically and efficiently reduce corrosion of an apparatus and obtain lactic acid with a low content of impurities, such as metallic components, normally in high yield, by hydrolyzing 2-chloropropionic acid in the presence of an alkali under specific reaction condition. CONSTITUTION:2-Chloropropionic acid is reacted and hydrolyzed in the presence of an alkali at 100-130 deg.C for 0.5-4hr and then at 130-180 deg.C for 0.5-3hr under autogenous pressure in a hermetically sealed vessel to afford the aimed lactic acid useful as an industrial chemical, food additive, etc. Hydroxides, oxides or salts of alkali (earth) metals with weak acids, such as NaOH, KOH, Ca(OH)2, CaO or Na2CO3, are preferred as the alkali. The amount thereof used is about an equivalent amount based on the 2-chloropropionic acid, i.e. preferably 0.8-1.2mol. in the case of the NaOH or KOH and preferably 0.4-0.6mol. in the case of the Ca(OH)2, CaO or Na2CO3 based on 1mol. 2-chloropropionic acid.

公开(公告)号：JPS63270638A

公开(公告)日：1988-11-08

申请号：JP10439187

申请日：1987-04-30

Applicant: MITSUI TOATSU CHEMICALS

Inventor： ONO HIROSHI ,  KASUGA TAKAHARU ,  HEN PARAA ,  IWAMOTO EIJU

IPC: B01J23/02 ,  C07B61/00 ,  C07C51/00 ,  C07C51/367 ,  C07C59/08 ,  C07C67/00

Abstract: PURPOSE:To improve quality in excellent energy efficiency by a simple device in obtaining the titled compound useful as industrial chemicals, etc., by hydrolyzing 2-chloropropionic acid, by carrying out the hydrolysis in the presence of specific amounts of calcium hydroxide and water. CONSTITUTION:2-Chloropropionic acid as a raw material is hydrolyzed in the presence of 0.4-0.8mol., preferably 0.48-0.52mol. based on 1mol. raw material of calcium hydroxide and 30-150g water at 80-200 deg.C, preferably 120-160 deg.C for 10min-12hr to give the aimed compound. In the reaction, calcium oxide can be used instead of calcium hydroxide. The hydrolysis is preferably done thoroughly until unreacted 2-chloropropionic is not detected.