SU1669916A1 - Method for manufacturing viscose - Google Patents

Abstract

This invention relates to viscose fiber technology and can be used to obtain viscose. The invention makes it possible to reduce the consumption of carbon disulfide from 24–28 to 9.3–23.1 wt.% By weight of cellulose without deteriorating the quality of viscose, which is achieved by irradiating the cellulose with accelerated electrons with a dose of 1–30 kGy, followed by processing it with 13–19 wt.% a solution of sodium hydroxide, cooling the alkali cellulose to 5 - 18 ° C, processing it with carbon disulfide and dissolving the resulting cellulose xanthate. 1 tab.

Description

This invention relates to viscose fiber technology and can be used to obtain viscose.

The purpose of the invention is to reduce the consumption of carbon disulfide without reducing the quality of viscose.

PRI me R 1 (by a known method). Sulphate prehydrolysis cellulose, which has a viscosity-forming reactivity (PC) C52Haa 110/11, is irradiated with an accelerated electron of 10 kGy. The irradiated cellulose is treated with a 16% sodium hydroxide solution in a mercerization press at 21 ° C for 30 minutes. The obtained alkaline cellulose is squeezed, crushed at 21 ° C for 120 minutes and loaded into the xanthogenator.

Carbon disulfide is introduced into the xanthogenerator in the amount of 28% of the mass of alpha-cellulose. Xanthogenesis is carried out for about 75 minutes. The initial xanthogenesis temperature is 21 ° C. finite 29 ° C.

In the process of xanthogenesis to prevent overheating

the reaction mass is cooled after its temperature reaches 27 ° C. After the completion of xanthogenesis, the calculated amounts of solvent alkali and water are supplied to the apparatus. The resulting mass is transferred to a solvent, where it is cooled to 14. ° C and dissolved for 3 hours.

The resulting viscose contains 8.4 wt.% Alpha cellulose, 6.4 wt.% Sodium hydroxide, has a filterability of 120 ml and a viscosity of 60 s.

PRI mme R 2. Performed analogously to example 1, except that used sulfite pulp with PC 70/10 and when xanthogenic introduced 24 wt.% Carbon disulfide.

PRI me R 3. Sulfate prehydrolysis cellulose, having a reactivity suitable for viscose formation (PC) CS2 / NaOH 110/11, is irradiated with accelerated electrons at a dose of 10 kGy. The irradiated cellulose is treated with a 16% sodium hydroxide solution in a mercerization press at 21 ° C for 30 minutes. The obtained alkaline cellulose squeeze and 120

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min crushed. In the grinding process, the alkaline cellulose is cooled to 18 ° C for 10 minutes. The crushed and cooled alkaline cellulose is loaded into a xantogenator.

For xanthogenesis, carbon disulfide is taken in an amount of 23.1 wt.% Based on the mass of alpha-cellulose. Xanthogenesis was carried out for 75 minutes. The initial xanthogenic temperature is 27 ° C. Forced cooling of the reaction mixture in the process of xanthogenesis is not subjected.

After completion of the xanthogenesis, the calculated amounts of solvent alkali and water are introduced into the apparatus. The resulting mass is transferred to a solvent, where it is cooled to 14 ° C and dissolved for 3 hours.

Ready viscose contains 8.4 wt.% Alpha-cellulose and 6.4 wt.% Hydroxide

sodium and has a filterability of 120 ml and a viscosity of 60 s.

Examples 4-30. Performed similarly to example 3, but with other values of the parameters.

The data presented in the table.

Claims (1)

The invention of the method of obtaining viscose, including the irradiation of cellulose with accelerated electrons with a dose of 1-30 kGy, followed by processing it with a 13-19 wt.% Solution of sodium hydroxide, treating alkaline cellulose with carbon disulfide and dissolving obtained cellulose xanthate, which is due to the fact that, in order to reduce the consumption of carbon disulfide without deteriorating the quality of viscose, before being treated with carbon disulfide, the alkaline cellulose is cooled to 5-18 ° C.