发明名称 |
PROCESS FOR THE MANUFACTURE OF N-PHOSPHONOMETHYLIMINODIACETIC ACID |
摘要 |
A process for the manufacture of N-phosphonomethyliminodiacetic acid which comprises: 1) reacting iminodiacetic acid with phosphorous acid and a source of formaldehyde in aqueous solution in the presence of concentrated sulphuric acid; 2) filtering and recovering the N-phosphonomethyliminodiacetic acid product precipitated in stage (1); 3) recovering the filtrates from stage (2) and optionally removing a proportion of the water therefrom; 4) transferring the filtrates from stage (3) to a further reaction stage in which further iminodiacetic acid is reacted with phosphorous acid and a source of formaldehyde in the presence of sulphuric acid; and thereafter 5) repeating stages (1), (2), (3) and (4) in a plurality of re-cycles.
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申请公布号 |
CA2152479(A1) |
申请公布日期 |
1994.07.21 |
申请号 |
CA19942152479 |
申请日期 |
1994.01.06 |
申请人 |
ZENECA LIMITED |
发明人 |
JONES, RAYMOND VINCENT HEAVON;STANDEN, MICHAEL CHARLES HENRY;RAE, GRAHAM ANDREW;RITCHIE, DAVID JOHN |
分类号 |
C07F9/38;(IPC1-7):C07F9/38 |
主分类号 |
C07F9/38 |
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地址 |
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