Method for preparing sodium sulfhydrate from hydrogen sulfide tail gas

A sodium hydrosulfide and hydrogen sulfide technology, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of difficult recovery and utilization of discharged solid phase, low production efficiency of sodium hydrosulfide, low absorption rate of hydrogen sulfide gas, etc. , to achieve the effects of environmental protection, low cost and high yield

Inactive Publication Date: 2008-05-28
QINGDAO AOHAIKE TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem of using hydrogen sulfide gas, calcium hydroxide and sodium sulfide as raw materials, the hydrogen sulfide gas absorption rate in the "one-step method for preparing sodium hydrogen sulfide" is low, the production efficiency of sodium hydrogen sulfide is low, the investment in process equipment is large, and the solid phase is discharged Difficult technical problems in recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Liquid CO 2 The carbonized hydrogen sulfide tail gas is composed of 70% hydrogen sulfide, 25% carbon dioxide and 5% water vapor by volume. The lye is mainly composed of 25% sodium hydroxide solution and 20% calcium hydroxide slurry. Calcium hydroxide is added according to 120-130% reaction molar amount of carbon dioxide gas, the pressure of hydrogen sulfide tail gas is 0.1-0.3 MPa at normal temperature, the stirring speed is controlled at 100 rpm, and 4 absorption reaction tanks are used.

[0038] barometric pressure

Ca(OH) 2 Overdose rate

Reaction time

0.3MPa

30％

85 minutes

0.3MPa

25％

65 minutes

0.3MPa

20％

45 minutes

0.2MPa

25％

70 minutes

0.2MPa

20％

45 minutes

0.2MPa

30％

85 minutes

0.1MPa

20％

45 minutes

0.1MPa

30％

85 minutes

0.1MPa

25％

65 minutes

[0039] In the present embodiment, because the hyd...

Embodiment 2

[0045] The hydrogen sulfide tail gas passed into the kiln gas and carbonized has the following composition by volume: 25% hydrogen sulfide, 15% carbon dioxide, 3% water vapor, and 57% nitrogen. The lye is mainly composed of 25% sodium hydroxide solution and 20% calcium hydroxide slurry. Calcium hydroxide is added according to 120-130% reaction molar amount of carbon dioxide gas, hydrogen sulfide tail gas pressure is 0.1-0.3MPa at normal temperature, stirring speed is controlled at 140 rpm, and two absorption reaction tanks are used.

[0046] barometric pressure

[0047] In the present embodiment, because the content of hydrogen sulfide is relatively low, the lye absorption reaction tank adopts 2-stage series absorption. The hydrogen sulfide tail gas is passed into two sets of alkali liquor absorption towers connected in series for alkali liquor absorption to prepare sodium hydrosulfide. After the reaction was completed, the solid and liquid were separated to prepare...

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PUM

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Abstract

A purpose of the invention is to provide a sodium hydrosulfide preparation method utilizing hydrogen sulfide exhaust. The invention not only can resolve the treatment problems of the three wastes of barium carbonate and strontium carbonate enterprises, but also can reuse calcium sulfate, the byproduct from the preparation of sodium hydrosulfide, as raw materials for other chemical production, which realizes the recycling of raw materials and products. The production ability of the traditional alkali solution absorbing method, the absorbing adaptability of mixed hydrogen sulfide exhaust and the sodium hydrosulfide preparation rate are enhanced; while the production cost is reduced and the exhaust can be discharged according to standards after being absorbed by alkali solution. The invention resolves the problems of low absorption rate of hydrogen sulfide gas, low production efficiency of preparation of sodium hydrosulfide, large investment of technical devices and difficulty of solid phase recycling existing in a method of 'one step for preparation of sodium hydrosulfide' using hydrogen sulfide gas, calcium hydroxide and sodium sulfide as raw materials.

Description

technical field [0001] The invention relates to a method for preparing sodium hydrosulfide, in particular to a method for preparing sodium hydrosulfide with hydrogen sulfide tail gas. Background technique [0002] Sodium hydrosulfide is a new type of chemical raw material after sodium sulfide. It not only has the basic characteristics and functions of sodium sulfide, but also because it is almost in the form of H2S in water. - Ions exist, the alkalinity of the aqueous solution is lower than that of sodium sulfide, and the ion concentration is correspondingly higher than that of sodium sulfide, so it has superior application performance in various industries such as light industry and chemical industry. For example: it is used as the raw material for the preparation of ammonium sulfide and the semi-finished pesticide ethanethiol. It is widely used in copper ore beneficiation in the mining industry, hair removal and tanning of raw hides in the leather industry, and used in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/32
Inventor 张海张文斌
Owner QINGDAO AOHAIKE TRADE
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