公开(公告)号：SE351650B

公开(公告)日：1972-12-04

申请号：SE838168

申请日：1968-06-19

Applicant: STAMICARBON

Inventor： HOOGENDONK J ,  JACOBS J ,  BRANS T

IPC: C07D251/62 ,  C07D55/24

Abstract: 1,222,678. Purification of melamine. STAMICARBON N.V. 20 June, 1968 [23 June, 1967], No. 29516/68. Heading C2C. A process for purifying melamine obtained by heating urea and/or a thermal decomposition product thereof in the presence of ammonia and a catalyst and absorption of the gaseous reaction mixture in water, and filtering the solution to remove impurities and crystallizing melamine from the mother liquor; comprises dissolving the crude melamine in water at a temperature not greater than 110‹ C. (under pressure where necessary) filtering the solution thereby obtained at a temperature not greater than 110‹ C. and at a pH value between 6 and 8, and separating melamine from the filtrate by crystallization.