Preparation and use of iminodisuccinic acid salts

Preparation of imino-disuccinic acid alkali metal salts (I) involves: (i) reacting maleic anhydride (MA), alkali metal hydroxide (AMH), ammonia and water, in MA:AMH:NH3:H2O molar ratio of 2:0.1-4:1.1-6:5-30, at 70-170 degrees C and 1-80 bars for 0.1-100 hrs.; (ii) distilling off NH3 and water from t...

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Bibliographic Details
Main Authors THOMAS ROICK, FRANK DOBERT, TORSTEN GROTH, ECKHARD WENDEROTH, WINFRIED JOENTGEN, PAUL WAGNER
Format Patent
LanguageEnglish
Published 30.10.1998
Edition6
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
APPARATUS THEREFOR
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
PAPER-MAKING
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
REGENERATION OF PULPING LIQUORS
TEXTILES
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Summary:Preparation of imino-disuccinic acid alkali metal salts (I) involves: (i) reacting maleic anhydride (MA), alkali metal hydroxide (AMH), ammonia and water, in MA:AMH:NH3:H2O molar ratio of 2:0.1-4:1.1-6:5-30, at 70-170 degrees C and 1-80 bars for 0.1-100 hrs.; (ii) distilling off NH3 and water from the reaction mixture, with addition of water and 0-4 mol. AMH per 2 mols. MA initially used, at 50-170 degrees C and 0.1-50 bars over 0.1-50 hours, and (iii) adding water in an amount such that the obtained solution has a solids content of 5-60 wt.%.
Bibliography:Application Number: AU19980070399