发明名称 |
CRYSTALS OF [S,S]-ETHYLENEDIAMINE-N,N'-DISUCCINIC ACID WITH HIGH BULK DENSITY AND METHOD OF OBTAINING THE SAME |
摘要 |
A method of crystallizing [S,S]-ethylenediamine-N,N'-disuccinic acid, characterized by regulating an aqueous solution of a metal salt of [S,S]-ethylenediamine-N,N'-disuccinic acid so as to have a temperature of 40 to 80 DEG C and pH of 1.9 to 4.5 and cooling the solution to 40 DEG C or lower over 0.2 to 10 hours while feeding a mineral acid so as to maintain the pH at 1.9 to 4.5 to thereby crystallize [S,S]-ethylenediamine-N,N'-disuccinic acid. By this method, crystals of [S,S]-ethylenediamine-N,N'-disuccinic acid which have a bulk density of 0.45 to 1.2 g/cm<3> can be obtained in a high yield while inhibiting cyclization during the crystallization.
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申请公布号 |
WO9925680(A1) |
申请公布日期 |
1999.05.27 |
申请号 |
WO1998JP05175 |
申请日期 |
1998.11.18 |
申请人 |
MITSUBISHI RAYON CO., LTD.;BAMBA, HIROYASU;TANAKA, SHIGEHO;NIWA, KIYONOBU;ENDO, TAKAKAZU |
发明人 |
BAMBA, HIROYASU;TANAKA, SHIGEHO;NIWA, KIYONOBU;ENDO, TAKAKAZU |
分类号 |
C07D241/08;C07C227/42;C07C229/16;C07C229/24;(IPC1-7):C07C229/24 |
主分类号 |
C07D241/08 |
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