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Alkali cleaning-extraction-hydrogenation combined process for producing low-sulfur-content gasoline

A technology of gasoline and alkali washing, which is applied in the fields of hydrotreating process, petroleum industry, and hydrocarbon oil treatment, and can solve problems such as octane number loss

Inactive Publication Date: 2015-07-01
YANGTZE UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the traditional hydrofinishing method is used, the olefin components with high octane number in catalytic cracking gasoline will be saturated and the octane number will be greatly lost.

Method used

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  • Alkali cleaning-extraction-hydrogenation combined process for producing low-sulfur-content gasoline
  • Alkali cleaning-extraction-hydrogenation combined process for producing low-sulfur-content gasoline
  • Alkali cleaning-extraction-hydrogenation combined process for producing low-sulfur-content gasoline

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Using FCC gasoline A as the raw material, first cut the raw material, the cutting point is 95°C, the heavy gasoline fraction accounts for 52% of the raw material, the gasoline raw material fraction (FCCN), light gasoline fraction (LCN), heavy gasoline fraction (HCN) The properties are shown in Table 1. The light gasoline fraction is first alkali-washed to remove mercaptans, and the alkali washing is conventional alkali washing (10% sodium hydroxide aqueous solution). After alkali washing, the mercaptan sulfur content in the light gasoline fraction is reduced to 15.3ug / g; The gasoline fraction enters the extraction and desulfurization unit to obtain the alkali washing-extraction light gasoline fraction and the extraction phase; the extraction agent is nitrogen-formylmorpholine, the solvent-oil ratio is 2:1, the number of extraction stages is 4, and the extraction temperature is 55°C. Remove thiophene, mercaptan, sulfide, and disulfide-like sulfides in light distillate ga...

Embodiment 2

[0029]Using FCC gasoline B as raw material, the light gasoline fraction is demercaptized by advanced alkali washing equipment, and the alkali washing is conventional alkali washing (10% sodium hydroxide aqueous solution), and the mercaptan sulfur content in gasoline is reduced to 22.5ug / g; The gasoline after alkali washing is cut, the cutting point is 100°C, and the light distillate gasoline is taken to investigate the desulfurization effect of the extractant. The solvent-to-oil ratio is 3:1, the number of extraction stages is 4, and the extraction temperature is 45°C to remove thiophene, mercaptan, sulfide, and disulfide-like sulfides in light fraction gasoline; the results are as follows: raw material light fraction sulfur The sulfur content is 332.4ug / g, and the sulfur content is reduced to 21.6ug / g after alkali washing and extraction, indicating that this process can produce gasoline with a sulfur content of less than 50ug / g and a sulfur content meeting the National IV stan...

Embodiment 3

[0031] The gasoline produced by catalytic cracking after hydrotreating of coker wax oil was used as raw material, the gasoline raw material was cut, and the cut point was 92°C, and the light distillate gasoline was taken to investigate the desulfurization effect of the extractant. The light gasoline fraction is demercaptanized by an advanced alkali washing device, and the alkali washing is conventional alkali washing (10% sodium hydroxide aqueous solution). After alkali washing, the mercaptan sulfur content in the light gasoline fraction is reduced to 4.2ug / g; The light gasoline fraction enters the extraction and desulfurization unit to obtain the alkali washing-extraction light gasoline fraction and the extraction phase. The extraction agent is nitrogen-formylmorpholine, the solvent-oil ratio is 2:1, the number of extraction stages is 4, and the extraction temperature is 38°C , Removal of thiophene, mercaptan, sulfide, and disulfide-like sulfides in light distillate gasoline. ...

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Abstract

The invention relates to a method for producing low-sulfur-content gasoline. The method comprises the steps of cutting a gasoline raw material into a light fraction and a heavy fraction, refining the light fraction with alkali to remove thioalcohol, then, enabling the light fraction to enter an extraction tower, and extracting to remove thiophene, thioether and disulfide type sulfides, so as to obtain an alkali cleaned-extracted light gasoline fraction and an extracted phase; mixing a sulfur-contained light gasoline fraction, recovered from the extracted phase, with a heavy gasoline fraction, then, carrying out selective hydrodesulfurization so as to obtain a hydrogenated heavy gasoline fraction, and mixing the alkali cleaned-extracted light gasoline fraction and the hydrogenated heavy gasoline fraction, thereby obtaining a gasoline product. According to the method, gasoline, of which the sulfur content is lower than 50 micrograms per gram and meets the national IV standard, can be produced, and gasoline, of which the sulfur content is lower than 10 micrograms per gram and meets the national V standard, can also be produced.

Description

technical field [0001] The invention relates to a method for reducing the sulfur content of gasoline, in particular to a method for reducing the sulfur content of catalytic cracking gasoline and producing ultra-low sulfur gasoline. Background technique [0002] With the enhancement of human environmental protection awareness, people pay more and more attention to the pollution of atmospheric environment caused by harmful substances in automobile exhaust. Countries all over the world have put forward increasingly strict requirements on the composition of engine fuel, especially the sulfur content. The European Union began to implement the Euro IV vehicle exhaust emission standard in 2005, requiring the sulfur content of gasoline to be less than 50ug / g. On September 1, 2009, the European Union began to implement the Euro V emission standard, requiring the sulfur content of gasoline to be less than 10ug / g. It is also planned to be implemented in 2014 The more stringent Euro VI ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/00
Inventor 沈喜洲许乐新尹先清朱师骏王国清许意成张保沙
Owner YANGTZE UNIVERSITY