Method for the production of viscose solutions

Claim 1

IN THE PROCESS OF FORMING A VISCOSE SOLUTION IN WHICH PROCESS A QUANTITY OF ALKALI CELLULOSE HAVING AN ALKALINITY OF THE ORDER OF ABOUT 15% NAOH BY WEIGHT IS INTRODUCED INTO A CHURN AND TREATED WITH CARBON DISULFIDE TO FORM SODIUM CELLULOSE XANTHATE AND IN WHICH AN AQUEOUS CAUSTIC SODA SOLUTION IS THEREAFTER ADMIXED WITH SAID FORMED CELLULOSE XANTHATE AND THE MIXTURE DISCHARGED INTO A DISSOLVING VESSEL TO FORM A FISCOSE SOLUTION THE STEPS COMPRISING; SCAVENGING SAID DISCHARGED CHURN AT LEAST ONCE WITH AN AQUEOUS CAUSTIC SODA SOLUTION HAVING AN ALKALINITY LESS THAN THAT OF SAID ALKALI CELLULOSE; DISCHARGING SAID SCAVENGING SOLUTION FROM SAID CHURN; COMBINING IN A DISSOLVING VESSEL SUBSTANTIALLY ALL OF SAID DISCHARGED SCAVENGING SOLUTION WITH AID PREVIOUSLY DISCHARGED MIXTURE TO FORM A VISCOSE SOLUTION HAVING AN ALKALINITY BETWEEN ABOUT 5% AND 8% NAOH BY WEIGHT; THEREAFTER INTRODUCING ANOTHR QUANTITY OF ALKALI CELLULOSE INTO SAID CHURN WHILE SAID CHURN IS STILL WET WITH SCAVENGING SOLUTION; AND REPEATING THE CYCLE.