| 摘要 |
A chelating agent having the formula WHEREIN; R is an alkyl group having about one to 20 carbon atoms, hydrogen, -CH2CH2OH, or -CH2COOM; and M is an alkali metal cation, is prepared by; (a) adjusting the pH of a first aqueous system consisting essentially of water and an amino acid having the formula OR AN ALKALI METAL SALT OF THE ACID TO ABOUT 6-10.5 TO FORM A SECOND AQUEOUS SYSTEM CONSISTING ESSENTIALLY OF THE ALKALI METAL SALT OF THE AMINO ACID DISSOLVED IN WATER, AND ADJUSTING THE TEMPERATURE OF THE SECOND AQUEOUS SYSTEM AT ABOUT 65 DEG -105 DEG C.; and (b) admixing epichlorohydrin with the second aqueous system while; (i) maintaining the pH of the resulting mixture at about 6-10.5; and (ii) maintaining the temperature of the resulting mixture at about 65 DEG -105 DEG C. for about 30-180 minutes to form a third aqueous system consisting essentially of an aqueous solution of the chelating agent.
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