PROCESS FOR THE MANUFACTURE OF N-PHOSPHONOMETHYLGLYCINE
摘要
A process whereby N-phosphonomethylglycine (glyphosate) or its salts is manufactured by: 1) forming N-phosphonomethylglycinonitrile by reacting aminomethylphosphonic acid, an alkali metal cyanide and formaldehyde in aqueous solution at a pH in the range from 10 to 13 (and preferably from 11 to 11.5) whilst adding mineral acid at a rate sufficient to maintain the pH within the desired range, and thereafter 2) hydrolysing the N-phosphonomethylglycinonitrile product of Stage 1) to form a salt of N-phosphonomethylglycine and optionally 3) neutralising the salt of N-phosphonomethylglycine to form N-phosphonomethylglycine.
申请公布号
WO9615135(A1)
申请公布日期
1996.05.23
申请号
WO1995GB02573
申请日期
1995.11.02
申请人
ZENECA LIMITED;ATHERTON, JOHN, HEATHCOTE;HODGKINSON, IAN