Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Refined Cotton Bleaching Process

A refined cotton and process technology, which is applied in the field of bleaching and refined cotton bleaching process, can solve the problems of increasing the cost of wastewater treatment of enterprises, deteriorating bleaching effect, and increasing production costs, so as to reduce the number of bleaching times and water consumption, and reduce the amount of escape , increase the effect of turbulence

Active Publication Date: 2018-10-26
HUBEI JINHANJIANG REFINED COTTON
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the unstable aqueous solution of chlorine dioxide, chlorine dioxide often escapes from the solution during the bleaching process, resulting in poor bleaching effect. It is necessary to increase the number of bleaching times to make the product meet the whiteness requirement, which not only increases water consumption, but also It wastes precious water resources, increases the production cost of the enterprise, and prolongs the bleaching time, reducing the production efficiency; at the same time, the escaping chlorine dioxide needs to be equipped with a tail gas absorption device, which increases the production cost
In addition, when the traditional bleaching process is used for production, a large amount of bleaching wastewater will be generated, which not only increases the wastewater treatment cost of the enterprise, but also pollutes the environment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Refined Cotton Bleaching Process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Refined cotton bleaching process, the specific production process is as follows:

[0015] a. Pre-bleaching: first discharge 25t of black pulp formed after cooking into the bleaching tank, then inject 25t of bleached wastewater into the bleaching tank, then add hydrochloric acid solution, adjust the pH value to 5, and then inject 5t into the bleaching tank The activator sodium hypochlorite solution, the available chlorine is controlled at 0.8g / L, then the agitator is turned on, after stirring for 28min, drain 25t to the sewage pool;

[0016] b. Pre-washing: use the water in the recovery pool to wash the black pulp. The washing time is 17 minutes. During washing, the water is discharged to the cooling water pool. When washing, water is drained while water is poured in, and the liquid level in the bleaching pool is kept constant;

[0017] c. Bleaching: Add 1.8t bleaching solution to the bleaching tank, the content of chlorine dioxide in the bleaching solution is 1.3g / L, th...

Embodiment 2

[0025] Refined cotton bleaching process, the specific production process is as follows:

[0026] a. Pre-bleaching: first discharge 28t of black pulp formed after cooking into the bleaching tank, then inject 20t of bleached wastewater into the bleaching tank, then add hydrochloric acid solution, adjust the pH value to 6, and then inject 7t into the bleaching tank The activator sodium hypochlorite solution, the available chlorine is controlled at 0.6g / L, then the agitator is turned on, after stirring for 26min, drain 30t to the sewage pool;

[0027] b. Pre-washing: use the water in the recycling pool to wash the black pulp. The washing time is 18 minutes. During washing, the water is discharged to the cooling pool. During washing, the water is drained while water is poured in, and the liquid level in the bleaching pool is kept constant;

[0028] c. Bleaching: Add 1t of bleaching solution to the bleaching tank, the content of chlorine dioxide in the bleaching solution is 1.2g / L, ...

Embodiment 3

[0036] Refined cotton bleaching process, the specific production process is as follows:

[0037] a. Pre-bleaching: first discharge 30t of black pulp formed after cooking into the bleaching tank, then inject 25t of bleached wastewater into the bleaching tank, then add hydrochloric acid solution, adjust the pH value to 4, and then inject 8t into the bleaching tank The activator sodium hypochlorite solution, the available chlorine is controlled at 0.5g / L, then the agitator is turned on, after stirring for 23min, drain 35t to the sewage pool;

[0038] b. Pre-washing: use the water in the recovery pool to wash the black pulp. The washing time is 15 minutes. During washing, the water is drained to the cooling pool. During washing, water is drained while water is poured in, and the liquid level in the bleaching pool is kept constant;

[0039] c. Bleaching: Add 2t of bleaching solution to the bleaching pool, the content of chlorine dioxide in the bleaching solution is 1.2g / L, the cont...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
whitenessaaaaaaaaaa
whitenessaaaaaaaaaa
whitenessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a bleaching process for refined cotton. The bleaching process includes the steps of a, pre-bleaching, to be more specific, discharging 25-30t of black slurry formed after cooking into a bleaching tank, injecting 20-25t of wastewater after bleaching into the bleaching tank, adding a hydrochloric acid solution, regulating pH to 4-6, injecting 5-10t of activating agent sodium hypochlorite solution into the bleaching tank, controlling effective chlorine to be at 0.5-1.0g / L, starting a stirrer for stirring for 20-30 minutes, and discharging 25-35t of water to the a sewage tank;; b, pre-washing; c, bleaching, d, washing after the bleaching; e, performing alkaline treatment; f, removing the chlorine; g, performing final washing. The bleaching process has the advantages that the activating agent is used in the pre-bleaching to reutilize the bleached wastewater, a bleaching effect is brought into play again, the discharge of bleaching wastewater is reduced, sewage treatment cost is lowered, and energy conservation and environment protection are achieved.

Description

technical field [0001] The present invention relates to the technical field of bleaching, more specifically to the technical field of refined cotton bleaching process. Background technique [0002] The production process of refined cotton is generally cotton opening-cooking-bleaching-rolling-drying-loading. Among them, the function of bleaching is mainly to improve the color of the product and further remove impurities contained in the product. At present, the common bleaching process of refined cotton generally includes the following steps: a, pre-bleaching, b, pre-washing, c, bleaching, d, washing after bleaching, e, alkali treatment, f, dechlorination, g, final washing; The oxidation potential of chlorine oxide is lower than that of cellulose, but higher than that of impurities and pigments attached to cellulose, so it is often used as a selective oxidant in the bleaching process of refined cotton. However, due to the unstable aqueous solution of chlorine dioxide, chlori...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/14D21C9/10
CPCD21C9/1031D21C9/144
Inventor 吴广文邹扬周航旭
Owner HUBEI JINHANJIANG REFINED COTTON
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com