公开(公告)号：US3817718A

公开(公告)日：1974-06-18

申请号：US81522669

申请日：1969-04-10

Applicant: STAMICARBON

Inventor： MAASS G ,  KORPEL H

IPC: C01C1/24 ,  B01D9/02 ,  C01B21/54 ,  C07C103/52

CPC classification number: C01C1/24

Abstract: A PROCESS FOR RECOVERING AMMONIUM SULPHATE FROM AN AQUEOUS SOLUTION OF AMMONIUM SULPHATE AND METHIONINE IS DISCLOSED, WHEREIN THE AMMONIUM SULPHATE IS RECOVERED FROM THE SOLUTION BY CRYSTALLIZATION AT A WEIGHT RATIO OF METHIONINE/AMMONIUM SULPHATE OF BETWEEN 0.01 AND 0.3, AND AT A PH OF BETWEEN 0.2 AND 6. THE AMMONIUM SULPHATE RECOVERED BY THE CRYSTALLIZATION STEP CONTAINS LESS THAN 1% BY WEIGHT OF METHIONINE, AND IS IN A FORM SUITED FOR FERTILIZER PRODUCTION.