Process for producing anhydrous ammonia by ammonia distillation and deacidification

An anhydrous ammonia and deacidification technology, applied in the field of coal chemical industry, can solve the problems of low ammonia content, failure to meet environmental protection requirements, and low purity of ammonia vapor

Active Publication Date: 2016-10-05
薛斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the reduction of high-quality coking coal reserves and the large-scale use of high-sulfur coal, the hydrogen sulfide content in the raw gas of many metallurgical coking and other enterprises has reached 8-12g / m 3 , the use of this desulfurization process has been unable to meet the relevant requirements of environmental protection regulations
At the same time, the purity of the ammonia vapor produced by this process is low, the ammonia content is less than 40%, and the content of acidic impurities such as hydrogen sulfide is about 10%, which is not suitable for further processing into high value-added products

Method used

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  • Process for producing anhydrous ammonia by ammonia distillation and deacidification
  • Process for producing anhydrous ammonia by ammonia distillation and deacidification
  • Process for producing anhydrous ammonia by ammonia distillation and deacidification

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0063] Such as figure 1 Shown, containing hydrogen sulfide 1-12g / m 3 , containing ammonia 2-13g / m 3 The coal gas enters the hydrogen sulfide scrubber 101 and the ammonia scrubber 102 in turn, absorbs hydrogen sulfide with desulfurized barren liquid and rich ammonia water, and absorbs ammonia with stripped water. Both the hydrogen sulfide scrubber and the ammonia scrubber operate under normal pressure, and the scrubbing temperature is 22-24°C. The hydrogen sulfide content of the washed gas is 200mg / m 3 Below, the ammonia content is 100mg / m 3 the following. The ammonia-rich water at the bottom of the ammonia scrubber is sent to the top of the hydrogen sulfide scrubber as part of the absorption liquid by the ammonia water pump 116 for spraying; the desulfurization-rich liquid at the bottom of the hydrogen sulfide scrubber mainly contains ammonia, fixed ammonium salts, hydrogen sulfide, hydrogen cyanide, and carbon dioxide , water, organic hydrocarbons and other components ar...

Embodiment 1

[0084] Embodiment 1 (in conjunction with attached figure 1 )

[0085] Such as figure 1 Shown, containing hydrogen sulfide 6g / m 3 , containing ammonia 8g / m 3 The coal gas enters the hydrogen sulfide scrubber 101 and the ammonia scrubber 102 in turn, absorbs hydrogen sulfide with desulfurized barren liquid and rich ammonia water, and absorbs ammonia with stripped water. Both the hydrogen sulfide scrubber and the ammonia scrubber operate under normal pressure, and the scrubbing temperature is 22-24°C. The hydrogen sulfide content of the washed gas is 200mg / m 3 Below, the ammonia content is 100mg / m 3 the following. The ammonia-rich water at the bottom of the ammonia scrubber is sent to the top of the hydrogen sulfide scrubber as part of the absorption liquid by the ammonia water pump 116 for spraying; the desulfurization-rich liquid at the bottom of the hydrogen sulfide scrubber mainly contains ammonia, fixed ammonium salts, hydrogen sulfide, hydrogen cyanide, and carbon dio...

Embodiment 2

[0092] Embodiment 2 (in conjunction with attached figure 2 )

[0093] Such as figure 2 Shown, containing hydrogen sulfide 8g / m 3 , containing ammonia 8g / m 3 The coal gas enters the hydrogen sulfide scrubber 201 and the ammonia scrubber 202 in sequence, absorbs hydrogen sulfide with desulfurized barren liquid and rich ammonia water, and absorbs ammonia with stripped water. Both the hydrogen sulfide scrubber and the ammonia scrubber operate under normal pressure, and the scrubbing temperature is 22-24°C. The hydrogen sulfide content of the washed gas is 200mg / m 3 Below, the ammonia content is 100mg / m 3 the following. The ammonia-rich water at the bottom of the ammonia washing tower is sent to the top of the hydrogen sulfide washing tower as part of the absorption liquid by the ammonia water pump 216 for spraying; the desulfurization-rich liquid at the bottom of the hydrogen sulfide washing tower mainly contains ammonia, fixed ammonium salts, hydrogen sulfide, hydrogen cy...

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Abstract

The invention discloses a process for producing anhydrous ammonia by ammonia distillation and deacidification. The process comprises the following steps of absorbing hydrogen sulfide and ammonia in coal gas containing hydrogen sulfide and ammonia to obtain washed coal gas; passing the washed coal gas and washed rich liquor through an ammonia distillation and deacidification system to obtain anhydrous ammonia; and absorbing the hydrogen sulfide with ammonia-containing desulfurization barren liquor, wherein the mass ratio of ammonia and acid components in the ammonia-containing desulfurization barren liquor is (3.2-5.0):1, the ammonia distillation and deacidification system works at a pressure of 0.3-1.18MPaG, and the acid components comprise hydrogen sulfide, carbon dioxide and hydrogen cyanide.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a process for producing anhydrous ammonia by distilling ammonia and deacidifying rich liquid in gas ammonia desulfurization. Background technique [0002] During the low-temperature dry distillation of coal, about 15%-35% of the sulfur and hydrogen combine to form hydrogen sulfide, and most of the nitrogen and hydrogen combine to form ammonia. Normally, the hydrogen sulfide content in crude gas is 1-12g / m 3 , the ammonia content is 2-13g / m 3 . When the gas is burned, the hydrogen sulfide in it generates sulfur oxides, which cause air pollution along with the flue gas emission. The environmental protection regulations of various countries generally require that the hydrogen sulfide content in the gas be controlled at 500mg / m3 for industrial fuel gas. 3 Below (Germany is 800mg / m 3 the following). The Ministry of Environmental Protection of the People's Republic of China'...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/10C10K1/10
Inventor 薛斌薛佳依
Owner 薛斌
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