viscose process

viscose process

(vĭs`kōs), method widely used for the commercial preparation of rayonrayon,
synthetic fibers made from cellulose or textiles woven from such fibers; more rayon is manufactured than any other synthetic fiber. The name was adopted (1924), in preference to "artificial silk," by the U.S. Dept. of Commerce and various commercial associations.
..... Click the link for more information.
. Cellulose, prepared from either wood pulp or, less commonly, cotton linters, is treated with sodium hydroxide (an alkali) and then with carbon disulfide, the resulting product being a substance called cellulose xanthate. Dissolved in sodium hydroxide, this alkaline cellulose xanthate forms a thick solution called viscose. Rayon yarn is made by forcing the viscose through tiny openings in a spinneret into an acid solution, which coagulates it in the form of fine strands. Most of the rayon manufactured today is produced by this method, al though other processes are also in use. The viscose process was discovered in 1892 by the English chemist Charles Frederick Cross and his collaborator, Edward John Bevan.

viscose process

[′vis‚kōs ‚prä·səs]
(chemical engineering)
A process for the manufacture of rayon by treating cellulose with caustic soda, and with carbon disulfide to form cellulose xanthate, which is then dissolved in a weak caustic solution to form the viscose; fibers are used as silk substitutes.
References in periodicals archive ?
The Research Study Aims At Achieving An Alternative Means Of Evaporating Water From Viscose Process Liquors (USED For Viscose Fibre Production), In Order To Considerably Reduce The Energy Requirement Of The Operation.
Till now, the Lyocell technology still follows the conventional viscose process using the pulp with low hemicelluloses content as the raw material [1-3], which is to guarantee a high yield of fiber in the conventional viscose process.
The prevalent rayon production method used in producing tire yam - the viscose process - uses sodium hydroxide, carbon disulfide, hydrogen sulfide, sulfuric acid and zinc.
In the case of the very low values for rayon emerging from Lenzing, we think full credit was being given for the fact that the pulp mills' energy needs were in fact renewable and not dependent on fossil fuels and that pulp is fed directly into the viscose process without incurring any transport or drying costs.
In the viscose process, gaseous effluent control and treatment is a fundamentally important part of the overall process and is continuously improving as the technology of the "closed box" process evolves.
The samples studied in this investigation were five commercially available regenerated cellulose tubular films of about 28 [[micro]meter] thickness, prepared according to the viscose process (3, 8, 9), by varying the manufacture conditions as referred previously (3) in order to obtain materials with different degrees of crystallinity.
according to the viscose process. In the viscose process a viscose solution is prepared by steeping pure cellulose in an aqueous concentrated caustic soda solution from which an alkali cellulose crumb is obtained.