Preparation and use of iminodisuccinic acid salts

• Main Authors: THOMAS ROICK, FRANK DOBERT, TORSTEN GROTH, ECKHARD WENDEROTH, WINFRIED JOENTGEN, PAUL WAGNER
• Format: Patent
• Language: English
• Published: 30.10.1998
• Edition: 6
• 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

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...