Method for preparing sodium sulfide from hydrogen sulfide waste gas produced in production of viscose fibre

A technology of viscose fiber and hydrogen sulfide, applied in the direction of alkali metal sulfide/polysulfide, etc., can solve the problems of low product quality, high iron ion content, short life of production equipment, etc., and achieve high product purity, high purity, The effect of fewer types of impurities

Inactive Publication Date: 2012-06-27
YIBIN HIEST FIBER +2
View PDF10 Cites 37 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patent converts hydrogen sulfide waste gas into sodium hydrogen sulfide liquid after treatment, which is also a single production method, and the scope of production resource utilization is narrow
[0014] In addition to the above deficiencies, at present, in the viscose fiber industry, there are two deficiencies in the production process of producing sodium sulfide from hydrogen sulfide waste gas: 1. The sodium sulfide solution has strong alkali corrosion damage to production equipment, and production The life of the equipment is short; 2. The sodium sulfide product produced by the existing production process has high iron ion content and low product quality, which cannot meet the needs of the high-quality soda sulfide industry

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
  • Method for preparing sodium sulfide from hydrogen sulfide waste gas produced in production of viscose fibre
  • Method for preparing sodium sulfide from hydrogen sulfide waste gas produced in production of viscose fibre
  • Method for preparing sodium sulfide from hydrogen sulfide waste gas produced in production of viscose fibre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The technical principle involved in the present invention is to use the principle of acid-base neutralization to absorb hydrogen sulfide waste gas with lye, and then use the principle of evaporation, concentration and crystallization to make the absorption liquid into sodium sulfide. The principle of the chemical equation is as follows:

[0058] 2NaOH+H 2 S=Na 2 S+2H 2 o

[0059] From the recovery of hydrogen sulfide waste gas to the production of sodium sulfide or sodium hydrosulfide, the overall process is as followsfigure 1 As shown, when the absorption liquid is evaporatively cooled and crystallized, the process steps are implemented figure 2 shown.

[0060] Below is a further description of the present invention, and the concrete steps are:

[0061] A. Under normal temperature and pressure, the exhaust gas containing hydrogen sulfide with a concentration of 3500ppm and carbon disulfide with a concentration of 4100ppm is directly input into the alkali spray to...

Embodiment 2

[0082] The technical principle involved in the present invention is to use the principle of acid-base neutralization to absorb hydrogen sulfide waste gas with lye, and then use the principle of evaporation, concentration and crystallization to make the absorption liquid into sodium sulfide. The principle of the chemical equation is as follows:

[0083] 2NaOH+H 2 S=Na 2 S+2H 2 o

[0084] From the recovery of hydrogen sulfide waste gas to the production of sodium sulfide or sodium hydrosulfide, the overall process is as follows figure 1 As shown, when the absorption liquid is evaporatively cooled and crystallized, the process steps are implemented figure 2 shown.

[0085] Below is a further description of the present invention, and the concrete steps are:

[0086] A. Under normal temperature and pressure, the exhaust gas containing hydrogen sulfide with a concentration of 3700ppm and carbon disulfide with a concentration of 3800ppm is directly input into the alkali spray ...

Embodiment 3

[0106] The technical principle involved in the present invention is to use the principle of acid-base neutralization to absorb hydrogen sulfide waste gas with lye, and then use the principle of evaporation, concentration and crystallization to make the absorption liquid into sodium sulfide. The principle of the chemical equation is as follows:

[0107] 2NaOH+H 2 S=Na 2 S+2H 2 o

[0108] From the recovery of hydrogen sulfide waste gas to the production of sodium sulfide or sodium hydrosulfide, the overall process is as follows figure 1 As shown, when the absorption liquid is evaporatively cooled and crystallized, the process steps are implemented figure 2 shown.

[0109] Below is a further description of the present invention, and the concrete steps are:

[0110] A. Under normal temperature and pressure, the exhaust gas containing hydrogen sulfide with a concentration of 3800ppm and carbon disulfide with a concentration of 3600ppm is directly input into the alkali spray ...

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 the field of production of viscose fibre in the textile industry, in particular to a method for preparing sodium sulfide from hydrogen sulfide waste gas produced in the production of the viscose fibre. The method comprises the steps as follows: A, the waste gas is fed into an alkali spray tower; B, hydrogen sulfide is absorbed in an alkali liquor in the alkali spray tower; C, impurities are removed; D, a preheated absorption liquid is delivered into a primary multi-effect evaporator; E, a solution is subject to settlement and desalination; F, the desalinated solution is filled into a semi-finished product barrel, and caustic soda is added into the desalinated solution; G, the solution in the semi-finished product barrel is delivered into a secondary single-effect evaporator; H, after undergoing the secondary evaporation, the solution is filled into a finished product barrel, and then is stirred for crystallization; and I, crystal sodium sulfide is made into tablets. The method has the advantage of realizing the optimal generation of sodium sulfide through the setting of processing parameters such as the size of main equipment, the pore diameter of a delivery pipeline, wind volume, wind velocity, the concentration of the alkali liquor, absorption time, circulating evaporation time, evaporation temperature, evaporation vacuum degree, precipitation time, stirring velocity, the rotational speed of a tablet making machine, and the like.

Description

technical field [0001] The invention relates to the field of viscose fiber production in the textile industry, in particular to a method for preparing sodium sulfide from hydrogen sulfide waste gas produced in viscose fiber production. Background technique [0002] At present, the production of viscose fiber generally adopts the process of alkaline sulfonation rubber making and acid coagulation forming. During the production process, a large amount of hydrogen sulfide waste gas that is harmful to human health and the environment will be produced. Therefore, hydrogen sulfide waste gas must be treated. Recycling. At present, there are three common recovery and treatment methods for the hydrogen sulfide waste gas generated in the viscose fiber production process: [0003] 1. Combustion method: mainly by using the flammability of hydrogen sulfide gas, the exhaust gas containing hydrogen sulfide is burned through a combustion furnace for oxidation reaction, and finally sulfuric ...

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 Applications(China)
IPC IPC(8): C01B17/22
Inventor 易家祥邓传东段美科瞿继丹张仁友李蓉玲李向华
Owner YIBIN HIEST FIBER
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap