Process for preparing 1-hydroxy-3-oxa-1,2,4,5-pentane...

Details Process for preparing 1-hydroxy-3-oxa-1,2,4,5-pentane... Process for preparing 1-hydroxy-3-oxa-1,2,4,5-pentane...

C - Chemistry, Metallurgy

07

C

260/522.2

C07C 51/367 (2006.01) C07C 59/305 (2006.01) C11D 3/20 (2006.01)

Patent

CA 1315294

05-21(6945)A ABSTRACT There is disclosed an improved process for preparing 1-hydroxy-3-oxa-1,2,4,5-pentane tetracarboxylic acid and 3,6-dioxa-1,2,4,5,7,8-octane hexacarboxylic acid wherein the unreacted starting acids are recovered in more desirable crystal habit. The acids are precipitated in salt form by lowering the pH of the reaction product to a range of from 4 to below 6 stepwise. The pH is lowered to above 6 in the first step and then relatively rapdily reduced to the desired level in the second step.

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