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Method for recovering liquid hydrocarbon and sodium hydrosulfide (NaHS) by purifying hydrogen desulfurization tail gas

A hydrodesulfurization and tail gas purification technology, which is applied in chemical instruments and methods, recovery of liquid hydrocarbon mixtures, sulfur compounds, etc., can solve the problems of environmental pollution caused by combustion and emission of hydrodesulfurization units

Active Publication Date: 2013-12-11
WUHAN KELIN FINE CHEM
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Problems solved by technology

This method not only solves the problem of environmental pollution caused by the combustion and emission of hydrodesulfurization units, but also enables the recycling and comprehensive utilization of waste gas resources in the petrochemical industry, increasing the added value of the industry

Method used

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  • Method for recovering liquid hydrocarbon and sodium hydrosulfide (NaHS) by purifying hydrogen desulfurization tail gas
  • Method for recovering liquid hydrocarbon and sodium hydrosulfide (NaHS) by purifying hydrogen desulfurization tail gas

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Embodiment Construction

[0015] combine figure 1 The embodiment of this scheme is described, and the present invention is further explained.

[0016] A crude benzene hydroprocessing enterprise in Hebei has a crude benzene hydrogenation tail gas flow rate: 300 Nm3 / h, temperature: 40 ° C, pressure: 0.4 Mpa, and the composition of the tail gas emission is shown in Table 1.

[0017] Table 1. Exhaust emission composition

[0018]

[0019] Such as figure 1 As shown in the schematic diagram of hydrodesulfurization tail gas purification and recovery of liquid hydrocarbons and NaHS, the tail gas 1 described in Table 1 enters the water washing tower 3 after passing through the tail gas buffer tank, and the small amount of ammonia and CO contained in the tail gas are washed. 2 , the solution 2 containing ammonia sulfide after washing is sent to the sour water stripping section for stripping treatment. After deamination, the gas passes through 4 and 5 two-stage lye absorption towers from bottom to top to ...

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Abstract

The invention discloses a method for recovering liquid hydrocarbon and sodium hydrosulfide (NaHS) by purifying hydrogen desulfurization tail gas, belonging to the field of comprehensive waste gas utilization and environmental protection. A hydrogen desulfurization device is used for performing washing for impurity removal, alkaline liquid catalysis absorption, dry-process fine desulfurization, compression liquefaction and separation on sulfur-containing tail gas to obtain NaHS and liquid hydrocarbon products meeting a national standard, and the remaining purified tail gas serves as clean fuel gas. By the adoption of the method, the problem of environment pollution caused by combustion emission of the hydrogen desulfurization device is solved; meanwhile, waste gas resources in the petrochemical industry are cyclically and comprehensively utilized, and the additional value of the industry is increased.

Description

technical field [0001] The invention relates to a technology for comprehensive utilization of sulfur-containing tail gas, in particular to a method for desulfurizing and purifying tail gas of a hydrodesulfurization device and recovering liquid hydrocarbons and NaHS. It belongs to the field of comprehensive utilization of waste gas and environmental protection. Background technique [0002] At present, the new chemical industry focuses on energy saving, environmental protection and the production of clean energy products. Hydrodesulfurization refining technology is widely used in the deep processing of crude benzene, coal tar, gasoline and diesel in petrochemical, coking and other industries. During the hydrodesulfurization process, some sulfur-containing tail gas will be produced, and the tail gas contains a large amount of hydrogen sulfide. As we all know, hydrogen sulfide is a harmful gas with the characteristics of high toxicity and foul smell. Direct combustion will cau...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/75B01D53/78B01D53/00C10G5/06C01B17/32C10L3/00
CPCY02A50/20
Inventor 张先茂王国兴王泽周雄周庆国王海洋赵志杰
Owner WUHAN KELIN FINE CHEM
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