Title:
PRODUCTION OF AMINODICARBOXYLIC ACID-N,N-DIACETIC ACID SALTS
Document Type and Number:
Japanese Patent JP3870448
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing an aminodicarboxylic acid-N,N- diacetic acid salt in a high yield in a state suppressed in the coloration of the reaction solution and capable of being applied as an industrial process.
SOLUTION: This method comprises reacting and distilling an aminodicarboxylic acid salt, formaldehyde and an alkali metal cyanide in the molar ratios of the formaldehyde and the alkali metal cyanide to the aminodicarboxylic acid salt in values of 2.6-3.0, respectively, under a vacuum condition. When the formaldehyde and the alkali metal cyanide are added and reacted with the aminodicarboxylic acid salt, the reaction is carried out at a reaction temperature of 85-110°C, while water is continuously supplied in a rate of ≥7 (g/min)/aminodicarboxylic acid salt (mole) and simultaneously distilled.
Inventors:
Shin Saito
Toru Yamamoto
Sumio Seiya
Toru Yamamoto
Sumio Seiya
Application Number:
JP21371596A
Publication Date:
January 17, 2007
Filing Date:
August 13, 1996
Export Citation:
Assignee:
SHOWA DENKO K.K.
International Classes:
C07C227/02; C07C229/24; (IPC1-7): C07C229/24; C07C227/02
Domestic Patent References:
| JP7089913A | ||||
| JP35010858B1 | ||||
| JP4290854A |
Foreign References:
| DE4211713A1 |
Attorney, Agent or Firm:
Shinji Kakinuma
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