Fate of CS2 in viscose process: a chemistry perspective

Cellulose dissolution in the viscose process has been facilitated through derivatization by carbon disulphide (CS 2 ) at xanthation stage by converting alkali cellulose (AC) to cellulose xanthate (CX). CX formation has been always accompanied with sulphur based byproducts formation as dictated by th...

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Bibliographic Details
Published in:Cellulose (London) 2022-02, Vol.29 (3), p.1451-1461
Main Authors: Gondhalekar, Sachin C., Pawar, Pravin J., Dhumal, Sunil S., Thakre, Shirish
Format: Article
Language:English
Subjects:
Bioorganic Chemistry
By products
Byproducts
Cellulose
Ceramics
Chemistry
Chemistry and Materials Science
Composites
Consumption
Glass
Hydrogen sulfide
Natural Materials
Optimization
Organic Chemistry
Original Research
Physical Chemistry
Polymer Sciences
Ripening
Sodium sulfate
Sodium sulfide
Sulfides
Sulfur
Sulfur compounds
Sustainability
Sustainable Development
Xanthation
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Summary:Cellulose dissolution in the viscose process has been facilitated through derivatization by carbon disulphide (CS 2 ) at xanthation stage by converting alkali cellulose (AC) to cellulose xanthate (CX). CX formation has been always accompanied with sulphur based byproducts formation as dictated by the mechanism published in earlier study (Gondhalekar et al . (Cellulose 26 3 1595–1604, 2019)). The sulphur byproducts formed during viscose synthesis are sodium sulphide (Na 2 S), sodium trithiocarbonate (Na 2 CS 3 : TTC) and other minor sulphur compounds. These byproducts continue to form during ripening process as dictated by time and temperature coupled with concentration of free caustic and CS 2 present in the system. These byproducts get converted into sodium sulphate (Na 2 SO 4 ), hydrogen sulphide (H 2 S), CS 2 and other sulphurous compounds during spinning. Overall, uncontrolled ripening without parametric optimization adversely impacts raw material (RM) consumption and creates sustainability challenges. Overall optimization based on viscose process fundamental insights presented in this study will effectively help in achieving operational excellence by reducing rate of undesired reactions to improve RM specific consumption and will compliment overall sustainability efforts in viscose industry.
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-021-04398-1