A refining process and device for viscose fiber

Abstract

The invention discloses a refining process for viscose. The refining process particularly comprises the following steps: the viscose washed in a first water washing station is desulfurized with NaOH, and the viscose desulfurized with NaOH enters a secondary water washing station; the viscose washed in the second water washing station is bleached with H2O2, and the viscose bleached with H2O2 enters a third water washing station to be washed. H2O2 is substituted for NaClO, residual NaOH in the viscose is remarkably reduced, an acid pickling step is omitted in production, and the pH value of applied oil can reach the standard only through water washing, and accordingly, labor is saved, and the refining production process is stabilized.

Description

Technical field [0001] The invention relates to the technical field of viscose fiber production, in particular to a refining process and device for viscose fiber. Background technique [0002] Refining is a process in the production process of viscose fiber. From front to back, it is one washing, desulfurization, two washing, bleaching, three washing, and oiling stations. In the industry, generally speaking, there are two sets of processes for desulfurization and bleaching. NaOH is matched with NaClO and Na 2 S with H 2 O 2 . If NaOH is used for desulfurization, in order to make the fiber whiteness reach the standard (the whiteness meter measured ≥79%), NaClO (strong oxidizing) is used for the back-end bleaching, and acid washing is added to neutralize the residual NaOH in the fiber; Na 2 S desulfurization ability is better than NaOH, the back end can use H 2 O 2 (The oxidizing property is weaker than NaClO) bleaching, there is not much NaOH residue in the fiber. [0003] Adopt Na...

AI Technical Summary

Problems solved by technology

Wherein (h) desulfurization, the crude product of natural cellulose film is put into the sodium hydroxide aqueous solution of 0.1~0.5% concentration by mass percentage and soaks for 20~50 seconds to carry out desulfurization treatment, obtains the crude product of natural cellulose film after desulfurization; (i) Bleaching, putting the desulfurized natural cellulose film crude product into an aqueous solution of sodium hypochlorite and soaking it for 20 to 50 seconds at room temperature to obtain the bleached natural cellulose film crude product; A large amount of water washing or pickling is required in the end, which also leads to an increase in material and labor costs, and the equipment is easy to corrode

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