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

Method for efficiently recycling elemental sulfur in process of treating sulfur dioxide flue gas by using sodium sulfide

A technology of sulfur dioxide and sodium sulfide, applied in the direction of sulfur preparation/purification, sulfate/bisulfate preparation, etc., which can solve the problems of high energy consumption

Inactive Publication Date: 2013-09-04
CENT SOUTH UNIV
View PDF3 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the key step in the production of S element in this process is the auto-oxidation and reduction reaction of sodium thiosulfate and sodium bisulfite in a high-temperature and high-pressure autoclave, which consumes a lot of energy.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: Elemental selenium powder catalyzes sodium thiosulfate and sodium bisulfite self-redox

[0016] 40g / L Na 2 500ml of S solution absorbs 1795mg / L of SO 2 After forming a solution with a pH value of 2.8, put it into the reactor, detect that the amount ratio of sodium bisulfite and sodium thiosulfate is 3.05, then add 10g of self-oxidation-reduction catalyst selenium powder, particle size 20 μm, heat and stir until the solution When the temperature was 90°C, the solution was light yellow, filtered and washed to obtain selenium powder from the redox catalyst, recovered 9.98g of selenium powder, the recovery rate was 99.8%, and then continued to heat and stir the solution for 1 hour to obtain 16.35g of elemental sulfur powder (such as using the patented The high temperature and high pressure method in CN100413565C can theoretically only obtain 12.99g of sulfur powder), and 43.63g of Glauber’s salt can be obtained by freezing and crystallizing the solution, and ...

Embodiment 2

[0017] Embodiment 2: Elemental tellurium powder catalyzes the autooxidation reduction of sodium thiosulfate and sodium bisulfite

[0018] 60g / L Na 2 500ml of S solution absorbs 1795mg / L of SO 2 After forming a solution with a pH value of 2.6, put it into the reactor, detect that the amount ratio of sodium bisulfite and sodium thiosulfate is 1.1, then add 10g of tellurium powder from the redox catalyst, particle size 27 μm, heat and stir until the solution When the temperature was 80°C, the solution was pale yellow, filtered and washed to obtain tellurium powder from the redox catalyst, and 9.97g of tellurium powder was recovered, with a recovery rate of 99.7%. Then, the solution was heated and stirred for 2 hours to obtain 24.41g of elemental sulfur powder (if using the patented The high-temperature and high-pressure method in CN100413565C can theoretically only obtain 12.30 g of sulfur powder), and 63.91 g of Glauber’s salt can be obtained by freezing and crystallizing the s...

Embodiment 3

[0019] Embodiment 3: Elemental tellurium powder catalyzes the autooxidation reduction of sodium thiosulfate and sodium bisulfite

[0020] 40g / L Na 2 500ml of S solution absorbs 1795mg / L of SO 2 After forming a solution with a pH value of 2.7, put it into the reactor, detect that the amount ratio of sodium bisulfite and sodium thiosulfate is 2.1, then add 10g of auto-redox catalyst sulfur powder, particle size 25 μm, heat and stir until the solution When the temperature was 85°C, the solution was light yellow, filtered and washed to obtain sulfur powder from the redox catalyst, recovered 9.95g of sulfur powder, the recovery rate was 99.5%, and then continued to heat and stir the solution for 3 hours to obtain 16.33g of elemental sulfur powder (if using the patented The high temperature and high pressure method in CN100413565C can theoretically only obtain 16.41g of sulfur powder), and 42.25g of Glauber's salt can be obtained by freezing and crystallizing the solution, and the ...

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 discloses a method for efficiently recycling elemental sulfur in a process of treating sulfur dioxide flue gas by using sodium sulfide. The method comprises the following steps of: adding a self-redox catalyst without limiting the ratio of the amount of substance of sodium hydrogen sulfite to the amount of substance of sodium thiosulfate in a process of catalyzing and recycling the sulfur at a low temperature; then stirring and heating to 60-100 DEG C; filtering the self-redox catalyst after the solution becomes light yellow, continuously stirring for reaction for 1-4 hours; filtering and separating to acquire the elemental sulfur; and evaporating, freezing and crystallizing the filtrate to acquire mirabilite. The catalyst has the application advantage of avoiding high-temperature and high-pressure reaction and keeping the ratio of the amount of substance of the sodium hydrogen sulfite to the amount of substance of the sodium thiosulfate to 2:1; the self-redox catalyst can be reused and the recovery rate of the self-redox catalyst is more than 99.5%; the recovery rate of the sulfur is more than 99%; the recovery rate of the mirabilite is more than 60%; the concentration of tail gas SO2 is lower than 50ppm; and therefore, the elemental sulfur can be prepared at a low temperature and at normal pressure, products with high added-value can be recycled, and the tail gas can reach the existing SO2 emission standard.

Description

technical field [0001] The invention belongs to the field of environmental protection science, and relates to a method for efficiently recovering elemental sulfur in the process of treating sulfur dioxide flue gas with sodium sulfide, in particular to a method for catalyzing the autooxidation and reduction of sodium thiosulfate and sodium bisulfite. Background technique [0002] Sulfur dioxide flue gas treatment is currently one of the most important aspects of environmental protection. The national "Twelfth Five-Year Plan" is expected to reduce sulfur dioxide emissions by 8%. Therefore, flue gas desulfurization has become an urgent problem in the field of environmental protection. [0003] Now desulfurization technology can be divided into three categories: (1) Wet method: limestone / lime-gypsum method, seawater desulfurization method, metal oxide-magnesia method, double alkali method, sodium alkali method, ammonia absorption method, biological desulfurization method and Mem...

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): C01B17/04C01D5/04
Inventor 何汉兵
Owner CENT SOUTH UNIV
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