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Method for producing sodium bisulfide products by viscose fiber industrial waste gas

A technology of industrial waste gas and viscose fiber, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of high impurities, low concentration, and products without any use value, so as to reduce emissions, improve economic benefits, Significant economic benefits

Active Publication Date: 2012-02-15
山东雅美科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the solution obtained by directly absorbing viscose fiber industrial waste gas with sodium hydroxide, the concentration of NaHS is only about 20%, so low-concentration and high-impurity NaHS products cannot be used directly at all.
Then although it has dealt with the waste gas of the viscose industry, the product obtained has no use value and can only be discarded.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Sodium hydroxide solution is used to absorb viscose fiber industrial waste gas to obtain a solution with an initial temperature of 20°C and an initial concentration of NaHS of 18%. The solution is preheated to 60°C by using the waste heat of steam condensed water in the workshop. Then it is pumped into the two-effect shell and tube heater through the circulation pump, the solution is heated to 100°C, and then pumped into the two-effect evaporator, and the vacuum is controlled at -80KPa to evaporate and concentrate until the concentration of NaHS in the solution reaches 35%, and immediately The solution is pumped into a vertical stirring settling tank for crystallization and sedimentation, and the sedimentation is completed when the crystals no longer precipitate, and then the crystallized miscellaneous salts are separated by a centrifuge, and the clear liquid enters the secondary single-effect steam heater and is heated to 135°C. Pump into the secondary single-effect eva...

Embodiment 2

[0021] Sodium hydroxide solution is used to absorb the waste gas from the viscose fiber industry, and the initial temperature is 40°C, and the initial NaHS

[0022] A solution with a concentration of 28% is preheated to 50°C by using the residual heat of the steam condensed water in the workshop. Then it is pumped into the two-effect shell and tube heater through the circulation pump, the solution is heated to 130°C, and then pumped into the two-effect evaporator, and the vacuum is controlled at -96KPa to evaporate and concentrate until the concentration of NaHS in the solution reaches 40%. The solution is pumped into a vertical stirring settling tank for crystallization and sedimentation. When the crystals no longer precipitate, the sedimentation is completed, and then the crystallized miscellaneous salts are separated by a centrifuge. The clear liquid enters the secondary single-effect steam heater and is heated to 125°C. Pump into the secondary single-effect evaporator, con...

Embodiment 3

[0024] Sodium hydroxide solution is used to absorb viscose fiber industrial waste gas to obtain a solution with an initial temperature of 30°C and an initial concentration of NaHS of 25%. The solution is preheated to 55°C by using the waste heat of steam condensed water in the workshop. Then it is pumped into the two-effect shell and tube heater through the circulation pump, the solution is heated to 120°C, and then pumped into the two-effect evaporator, and the vacuum is controlled at -88KPa to evaporate and concentrate until the concentration of NaHS in the solution reaches 38%. The solution is pumped into a vertical stirring settling tank for crystallization and sedimentation. When the crystals no longer precipitate, the sedimentation is completed, and then the crystallized miscellaneous salts are separated by a centrifuge. The clear liquid enters the secondary single-effect steam heater and is heated to 130°C. Pump into the secondary single-effect evaporator, control the va...

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PUM

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Abstract

The invention relates to a method for producing sodium bisulfide products by viscose fiber industrial waste gas, which is characterized in that the viscose fiber industrial waste gas is used as a raw material, and after the viscose fiber industrial waste gas is absorbed by NaOH solution, sodium bisulfide products with the concentration conforming to the national standard are prepared through steps of preheating, evaporation concentration, crystallization settlement, secondary evaporation concentration, package and the like. The method has the advantages that the sodium bisulfide products capable of being utilized are prepared, the economic benefit of the viscose fiber industrial production is improved, simultaneously, the emission of hydrogen sulfide in the viscose fiber industrial waste gas is also reduced, and the environment pollution caused by the viscose fiber industrial waste gas is reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, and relates to a method for producing sodium hydrosulfide products, in particular to a method for producing sodium hydrosulfide products with viscose fiber industrial waste gas. Background technique [0002] The waste gas produced in the viscose fiber industrial production process contains hydrogen sulfide (H 2 S) waste gas and carbon disulfide waste gas. Hydrogen sulfide and carbon disulfide are highly toxic gases, and direct discharge will cause serious air pollution. At present, the methods for treating waste gas from the viscose fiber industry include: 1. Catalytic desulfurization method, which is to contact the mixed waste gas with the catalyst liquid phase to convert hydrogen sulfide into sulfur for elimination; but due to the lack of catalyst sources, high price and high operating cost But it is difficult to popularize; 2. Combustion method, this method has strict requirements on the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/32
CPCY02P20/129
Inventor 白长军刘方波李西江朱永勇
Owner 山东雅美科技有限公司
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