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Method for purifying byproducts of soda ash and sodium sulphide by utilizing methane

A technology of sodium sulfide and biogas, which is applied in the direction of alkali metal sulfide/polysulfide, gas fuel, petroleum industry, etc., can solve the problem of strong corrosion of equipment, improve the purity and quality, facilitate popularization and application, and has high economic benefits Effect

Inactive Publication Date: 2012-01-11
王嘉兴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogen sulfide is a gas with the smell of rotten eggs, which is a strong nerve poison. The combustion of hydrogen sulfide produces sulfur dioxide or sulfur trioxide, which is highly corrosive to equipment.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0012] A method for biogas purification by-product soda ash and sodium sulfide, comprising the following specific steps:

[0013] Step A: Configure sodium hydroxide solution, which contains 400kg of sodium hydroxide, and put it into the reactor, feed biogas into the sodium hydroxide solution from the bottom of the reactor, and control the biogas flow rate at 200m 3 / h, the pressure in the reactor is controlled at 1.8MPa, wherein, the mass ratio of carbon dioxide and sodium hydroxide pure substance participating in the reaction is 1: 1.81, the reaction generates sodium carbonate and sodium sulfide, and obtains a mixed solution containing sodium carbonate and sodium sulfide , and the purified biogas is output from the top of the reactor;

[0014] Step B: the mixed solution containing sodium carbonate and sodium sulfide obtained in step A is filtered through a filter to remove a small amount of impurities to obtain clarified sodium carbonate and sodium sulfide filtrate, and the f...

Embodiment 2

[0016] A method for biogas purification by-product soda ash and sodium sulfide, comprising the following specific steps:

[0017] Step A: Configure sodium hydroxide solution, which contains 400kg of sodium hydroxide, and put it into the reactor, feed biogas into the sodium hydroxide solution from the bottom of the reactor, and control the biogas flow rate at 220m 3 / h, the pressure in the reactor is controlled at 1.5MPa, wherein, the mass ratio of carbon dioxide and sodium hydroxide pure substance participating in the reaction is 1: 2.01, the reaction generates sodium carbonate and sodium sulfide, and obtains a mixed solution containing sodium carbonate and sodium sulfide , and the purified biogas is output from the top of the reactor;

[0018] Step B: the mixed solution containing sodium carbonate and sodium sulfide obtained in step A is filtered through a filter to remove a small amount of impurities to obtain clarified sodium carbonate and sodium sulfide filtrate, and the f...

Embodiment 3

[0020] A method for biogas purification by-product soda ash and sodium sulfide, comprising the following specific steps:

[0021] Step A: Configure sodium hydroxide solution, which contains 400kg of sodium hydroxide, and put it into the reactor, feed biogas into the sodium hydroxide solution from the bottom of the reactor, and control the biogas flow rate at 240m 3 / h, the pressure in the reactor is controlled at 1.2MPa, wherein, the mass ratio of carbon dioxide and sodium hydroxide pure substance participating in the reaction is 1: 1.61, the reaction generates sodium carbonate and sodium sulfide, and obtains a mixed solution containing sodium carbonate and sodium sulfide , and the purified biogas is output from the top of the reactor;

[0022] Step B: the mixed solution containing sodium carbonate and sodium sulfide obtained in step A is filtered through a filter to remove a small amount of impurities to obtain clarified sodium carbonate and sodium sulfide filtrate, and the f...

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Abstract

The invention provides a method for purifying byproducts of soda ash and sodium sulphide by utilizing methane. The method comprises the following steps of: introducing methane into sodium hydroxide solution at a flow rate of 200-240m<3> / h, controlling reaction pressure to be 1.2-1.8MPa, reacting to generate calcium carbonate and calcium sulphide, filtering to obtain sodium carbonate and sodium sulphide filtrates, and carrying out reduced-pressure distillation to obtain the soda ash and sodium sulphide products. The method provided by the invention is simple to operate and is convenient to popularize and apply, and carbon dioxide and hydrogen sulphide impurities which are contained in methane are effectively absorbed, thus purity and quality of methane are improved; and meanwhile, waste materials are changed into things of value, sodium carbonate and sodium sulphide products with higher economic benefit are obtained, and potential economic value of methane is effectively developed.

Description

technical field [0001] The invention relates to the technical field of biogas purification, in particular to a method for biogas purification by-products of soda ash and sodium sulfide. Background technique [0002] At present, biogas digesters have been widely used in rural areas of our country, and the use of biogas for cooking and lighting has become quite common. On the one hand, this improves the living conditions of farmers, on the other hand, it also reduces living expenses and makes comprehensive use of energy. However, since the raw biogas only contains 60-65% combustible components, the remaining components are mainly carbon dioxide, and also contain a small amount of hydrogen sulfide and water vapor. Among them, the content of carbon dioxide is about 35-40%, which reduces the combustible value or energy value of biogas. Hydrogen sulfide is a gas with the smell of rotten eggs, which is a strong nerve poison. The combustion of hydrogen sulfide produces sulfur diox...

Claims

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Application Information

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IPC IPC(8): C10L3/10C01D7/07C01B17/22
Inventor 王嘉兴
Owner 王嘉兴
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