Preparation method of cotton pulp and preparation method of viscose fiber
A technology of viscose fiber and cotton pulp, which is applied in the direction of cellulose raw material pulping, fiber raw material treatment, pulping with inorganic alkali, etc., and can solve the problem of low cellulose content
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[0025] The invention provides a kind of preparation method of cotton pulp, comprises the following steps:
[0026] The cotton linters are sequentially subjected to dry impurity removal and wet impurity removal to obtain impurity-removed cotton linters;
[0027] Mix the impurity-removed cotton linters with the cooking liquid, heat up to 85-95°C, and keep warm for 50-70 minutes; continue to heat up to 110-125°C, and keep warm for 120-300 minutes to obtain the cooked slurry; the cooking liquid includes alkali and hydrogen peroxide;
[0028] The cooked pulp is sequentially subjected to beating, desanding, chloralkaliization, bleaching, acid treatment and papermaking to obtain cotton pulp.
[0029] In the present invention, the cotton linters are sequentially subjected to dry impurity removal and wet impurity removal, and then the impurity-removed cotton linters are cooked. In the present invention, the cotton linters are preferably sequentially passed through a cotton opener, a s...
Embodiment 1
[0058] 3.2 tons of cotton linters are successively passed through the cotton opener and the secondary opener to velvet and break the cotton linters, and then pass through the dry-type impurity removal unit for impurity removal; The short fluff is put into the hydraulic pulper for pulping and dispersion, the desander is used for desanding operation, and the thickener is used to concentrate to a concentration of 40%.
[0059] The temperature of alkali preparation is controlled at less than 25°C, the amount of alkali used is 20%, the bath ratio is 1:4.0, the amount of penetrant JFC is 0.4%, and the amount of hydrogen peroxide is 8%. Send into steamed balls.
[0060] For the first cooking, the temperature is raised for 40 minutes, the temperature is raised to 85°C, and the temperature is kept for 60 minutes, and then the temperature is raised for the second time for 40 minutes, the temperature is 125°C, and the temperature is kept for 300 minutes to complete the cooking.
[0061]...
Embodiment 2
[0067] 3.3 tons of cotton linters are successively passed through the cotton opener and the second cotton opener to velvet and break the cotton linters, and then pass through the dry-type impurity removal unit for impurity removal; The short fluff is put into the hydraulic pulper for pulping and dispersion, the desander is used for desanding operation, and the thickener is used to concentrate to a concentration of 45%.
[0068] The temperature of alkali preparation is controlled at less than 25°C, the amount of alkali used is 21%, the bath ratio is 1:4.0, the amount of penetrant JFC is 0.4%, and the amount of hydrogen peroxide is 9%. Send into steamed balls.
[0069] The first time of cooking is to heat up for 40 minutes, the temperature is raised to 90°C, and the temperature is kept for 50 minutes, and then the temperature is raised for the second time for 40 minutes, the temperature is 120°C, and the temperature is kept for 250 minutes to complete the cooking.
[0070] Wash...
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