Beneficiation of lignin solutions and pulp mill wastes

Abstract

Abstract THE PRESENT DISCLOSURE IS DIRECTED PRIMARILY TO A METHOD OF PRODUCING VALUABLE PRODUCTS FROM AQUEOUS SOLUTIONS OF LIGNIN AND LIGNIN DERIVATIVES. AQUEOUS SOLUTIONS OF THE LIGNIN AND DERIVATIVES THEREOF ARE AVAILABLE AS COMMERCIAL SOLUTIONS, CAN BE MADE FROM SOLIDS OR SEMI-SOLID MIXTURES THEREOF OR ARE AVAILABLE AS WASTE EFFLUETS FROM PULP PRODUCING MILLS. WITH RESPECT TO THE LATTER SOURCE, THE INVENTIVE METHOD NOT ONLY PERMITS THE BO OBTENTION OF VALUABLE PRODUCTS THEREFROM, BUT ALSO REDUCES THE AMOUNT OF NONBIODEGRADABLE AND TOXIC MATERIALS NORMALLY CONTAINED THEREIN TO BE ELIMINATED PRIOR TO DISCHARGE. IN ADDITION, THE METHOD REDUCES THE COLOR OF THE FINAL DISCHARGE. BASICALLY, THE METHOD ENTAILS THE ADDITIONS TO THE LIGNIN OR LIGNIN DERIVATIVE SOLUTION OF A POLYVALENT METAL SALT, THE CATION OF WHICH WILL REACT WITH A PORTION OF THE LIGNIN SOLUTION TO PRODUCE A WATER-INSOLUBLE PRECIPITATE, ACIDIFICATION OF THE PRECITIATE AND FINAL TREATMENT WITH A BASIC SOLUTION. THE FINAL PRODCUTS POSSESS UTILITIES AS SCALE AND PRECIPITATE AGENTS FOR AQUEOUS SYSTEMS, NAMELY STEAM PRODUCING AND COOLING WATER SYSTEMS.

Inventors

• 👤 K Lange
• 👤 A Stern
• 👤 L Gasner
• 👤 Y Hsu

Bibliographic Details