发明名称 |
Improved, controlled temperature process for making 2,2'-oxodisuccinates useful as laundry detergent builders. |
摘要 |
<p>High yields of 2,2 min -oxodisuccinate are secured by reacting maleate and malate in aqueous alkaline media containing mixtures of particular divalent (e.g., Ca<2><+>) and solubilizing monovalent (e.g., Na<+>) cations. In a preferred embodiment, the process has both an elevated temperature primary reaction step and one or more low temperature maturation steps. Yields of 2,2 min -oxodisuccinate are increased and formation of fumarate by-product is minimized. Malate, useful as a starting-material in the process, is also provided near-quantitatively by heating an aqueous alkaline mixture of maleate and excess of the divalent cations calcium, magnesium or mixtures thereof in a reactor at autogenous pressures and at temperatures above reflux, yielding an unusual, typically granular solid form of the divalent metal malate salt.</p> |
申请公布号 |
EP0320213(B1) |
申请公布日期 |
1995.03.08 |
申请号 |
EP19880311548 |
申请日期 |
1988.12.06 |
申请人 |
THE PROCTER & GAMBLE COMPANY |
发明人 |
CONNOR, DANIEL S.;KRETSCHMAR, HERBERT C.;MACBRAIR, CLIFFORD LEROY, JR.;CLEARY, JAMES ALBERT |
分类号 |
C11D3/20;C07C51/367;C07C59/347;(IPC1-7):C07C59/305 |
主分类号 |
C11D3/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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