Production method of refined cotton

A production method and technology for refining cotton, which can be applied in the direction of chemical production of bast fibers, etc., can solve the problems of unsafe concentrated sulfuric acid, easy carbonization, and large discharge of acid water in production, so as to reduce emissions and reduce water and steam consumption. , the effect of saving processing costs

Inactive Publication Date: 2012-01-18
SICHUAN NITROCELLULOSE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the production process of domestic refined cotton is: cotton linters opening→steaming→washing→bleaching→acidification→cold washing→drying, among which 98% concentrated sulfuric acid is used for washing and acidification of alkaline refined cotton, but It is not safe to use concentrated sulfuric acid in production. Concentrated sulfuric acid is easy to carbonize when it encounters refined cotton, and the discharge of acid water is large (22t / RC)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Cotton linter cooking: the cooking liquid is an aqueous solution, wherein the NaOH content is 20g / l, and the content of sodium alkylbenzenesulfonate is 0.05%. Add cooking liquid, the total weight of cooking liquid is 4 times that of cotton linters, turn the cooking pot, and at the same time use steam to heat up the cooking liquid to 120°C, the heating time is 30min, after heating, maintain the cooking temperature at 120-130°C, and the cooking time is 3h .

[0024] 2) washing; use 6 cubic meters of nitrocellulose acid waste water per hour during washing, and the pH value of the refined cotton after washing is 6.8;

[0025] 3) Bleaching: use sodium hypochlorite solution for bleaching, the available chlorine concentration of sodium hypochlorite solution is 0.2g / l, the alkalinity is 0.03g / l, the bleaching temperature is 25°C, and the bleaching time is about 45 minutes.

[0026] 4) Acidification: After adding nitrocellulose acid wastewater, the pH value is 2; the acidifi...

Embodiment 2

[0030] 1) Cotton linters cooking: the cooking liquid is an aqueous solution, wherein the NaOH content is 31g / l, and the sodium alkylbenzenesulfonate content is 0.3%, and the cooking solution is used to infiltrate first, and the soaked cotton linters are added to the cooking pot, Add the cooking liquid according to the weight ratio of the cooking liquid to 1:5, turn the cooking pot, and at the same time use steam to raise the temperature of the cooking liquid to 130°C, the heating time is 50min, and maintain the cooking temperature at 130-140°C after heating. The cooking time is 2.5h.

[0031] 2) Washing: Use 10 cubic meters of nitrocellulose acid waste water per hour during washing, and the pH value of the refined cotton after washing is 7.3;

[0032] 3) Bleaching: use sodium hypochlorite solution for bleaching, the sodium hypochlorite solution has an available chlorine concentration of 0.5g / l and an alkalinity of 0.05g / l. The bleaching temperature is 35°C, and the bleaching ...

Embodiment 3

[0037] 1) Cotton linter cooking: the cooking liquid is an aqueous solution, wherein the NaOH content is 42 g / l. The content of sodium alkylbenzene sulfonate is 0.5%. It is infiltrated with the cooking solution first, and the cotton linters after soaking are added in the cooking pot, and the cooking liquid is added in an amount of 1:10 according to the weight ratio of the cooking material liquid, and the cooking pot is rotated. At the same time, use steam to raise the temperature of the cooking liquid to 140°C for 80 minutes. After heating, maintain the cooking temperature at 140-150°C for 2 hours.

[0038] 2) washing; use nitrocellulose acid waste water volume 15 cubic meters per hour during washing, and the pH value of refined cotton after washing is 6.9;

[0039] 3) Bleaching: use sodium hypochlorite solution for bleaching, the sodium hypochlorite solution has an available chlorine concentration of 1.8g / l, an alkalinity of 0.08g / l, a bleaching temperature of 38°C, and a blea...

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Abstract

The invention belongs to the technical field of refined cotton production, and particularly relates to a production method of refined cotton; the invention can not only improve the quality of refined cotton products, but also reduce water and steam consumption, and can reduce acid water discharge. The method particularly comprises the following steps of: 1) boiling of cotton linter; 2) washing, wherein nitrocellulose acidic waste water is used for washing, and washing is performed till the pH of the cotton material is 6.5-7.5; 3) bleaching, wherein a sodium hypochlorite solution is used for bleaching; 4) acidification, wherein nitrocellulose acidic waste water is added during acidification to control the pH to be 1-5; 5) cold washing, wherein cold washing is performed with water. The nitrocellulose acidic waste water has a total acidity of 5-15 g / l, and comprises the following main components by weight: 0.003%-0.023% of sulfuric acid, 0.006%-0.018% of nitric acid, and the balance of water and impurities. The beneficial effect of the invention is that nitrocellulose acid water needing to be discharged is used to substitute concentrated sulfuric acid during the refined cotton production process, which avoids the carbonization of refined cotton by concentrated sulfuric acid, improves the quality of refined cotton, reduces water and consumption, reduces the discharge of nitrocellulose acid water, and saves the cost for nitrocellulose acid water treatment.

Description

technical field [0001] The invention belongs to the technical field of refined cotton production, in particular to a production method of refined cotton. Background technique [0002] At present, the production process of domestic refined cotton is: cotton linters opening→steaming→washing→bleaching→acidification→cold washing→drying, among which 98% concentrated sulfuric acid is used for washing and acidification of alkaline refined cotton, but It is not safe to use concentrated sulfuric acid in production. Concentrated sulfuric acid is easy to carbonize when it encounters refined cotton, and the discharge of acid water produced is large (22t / RC). When acidifying refined cotton, the difference in acid concentration is large, and the quality uniformity of refined cotton is poor. Usually, the product index is whiteness 78-81%, and ash content 0.15-0.19%. Although there are certain disadvantages in using concentrated sulfuric acid in the production process of refined cotton, co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01C1/02
Inventor 王维智郭朝刚郭逢文蔺志强吴定军
Owner SICHUAN NITROCELLULOSE CORP
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