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

Process for preparing chlorine dioxide for pulp bleaching and apparatus thereof

A chlorine dioxide and pulp bleaching technology, applied in chlorine oxide and other directions, can solve the problems of small preparation capacity, the process technology cannot reach the production scale, etc., and achieves large adaptability to output changes, high production capacity and reaction efficiency, and reduces emissions. Effect

Inactive Publication Date: 2009-03-25
SICHUAN KAIWO ENVIRONMENTAL PROTECTION TECHCO
View PDF0 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem in the preparation of chlorine dioxide in China is that the preparation capacity is small, and the process technology cannot reach the corresponding production scale.

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
  • Process for preparing chlorine dioxide for pulp bleaching and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0017] Chlorine dioxide prepared by the present invention is to be raw material with sodium chlorate, sulfuric acid, methyl alcohol, and is obtained through chemical reaction, once three kinds of raw materials are contacted in generator, the reaction represented by following reaction formula will take place:

[0018] 12NaClO 3 +8H 2 SO 4 +3CH 3 OH→12ClO 2 +9H 2 O+4Na 3 H(SO 4 ) 2 +3HCOOH

[0019] First, send the impurity-free sodium chlorate, methanol, and sulfuric acid solutions into the generator in proportion, heat and control the temperature of the generator at 71°C to 73°C. Among them, sodium chlorate is added before the inlet of the generator circulation pump, and sulfuric acid and methanol are added from the outlet of the reboiler. At the same time, the mother liquor is circulated between the generator and the reboiler through...

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

No PUM Login to View More

Abstract

The invention relates to a preparation process of chlorine dioxide used for pulp bleaching and a corresponding apparatus. The invention adopts sodium chlorate, sulfuric acid and methyl alcohol as materials which are mixed according to a certain proportion for reaction to generate chlorine dioxide and acid mirabilite. The chlorine dioxide is absorbed by iced water to generate the chlorine dioxide solution; the by-product mirabilite suspension is filtered by a rotary-drum vacuum filter to filter the mirabilite crystal out and then the mother solution and the filter solution are collected by a mother solution tank to return to the reactor for recycling use and the mirabilite crystal is directly diluted by black liquor. The invention has the beneficial effects that the process is simple; the productivity and reaction efficiency are high; the material cost is low; the productivity adaptability is high; the purity of chlorine dioxide is high; the content of chlorine is low; as the by-product of the preparation process, the mirabilite can be consumed in the paper mill so as to reduce the emission of contamination.

Description

technical field [0001] The invention relates to a chloride preparation process and a device thereof, in particular to a preparation process of chlorine dioxide for pulp bleaching and a device thereof. Background technique [0002] Chlorine dioxide is favored by people because of its strong bactericidal ability, no harm to humans and animals, and no secondary pollution to the environment. Chlorine dioxide is not only a broad-spectrum environmentally friendly bactericidal disinfectant that does not produce carcinogens, but also shows remarkable effects in sterilization, food preservation, and deodorization. Chlorine dioxide can also be used for bleaching. For example, chlorine dioxide can be used instead of chlorine dioxide for textile and papermaking. Moreover, at present, national regulations prohibit the use of liquid chlorine bleaching technology in new projects, so the bleaching technology without liquid chlorine has been widely promoted. [0003] At present, the prepar...

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
IPC IPC(8): C01B11/02
Inventor 任坤标
Owner SICHUAN KAIWO ENVIRONMENTAL PROTECTION TECHCO
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