Method for deeply desulfurizing sulfur-containing raw material

A deep desulfurization and raw material technology, applied in the distillation control/regulation of hydrocarbon oil, petroleum industry, hydrocarbon oil treatment, etc., can solve the problems of reducing solvent sulfide, unfavorable octane number, solvent purity decline, etc., and achieve octane number lossless effect

Active Publication Date: 2018-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Description
  • Claims
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Problems solved by technology

However, during liquid-liquid extraction, it is difficult to effectively separate the organic solvent from the extracted gasoline, and they are often entrained with each other. The extracted gasoline usually needs further follow-up treatment, such as washing with water, while the solvent absorbs sulfides. At the same time, the entrainment of more gasoline hydrocarbons is not conducive to the maintenance of octane number, nor to the subsequent solvent recovery and regeneration, thus reducing the ability of the solvent to continue to extract sulfides
[0012] During the recycling process of organic solvents, more polymers, sediments, stable salts, etc. are formed due to the dissolution of more hydrocarbon materials and the py

Method used

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  • Method for deeply desulfurizing sulfur-containing raw material
  • Method for deeply desulfurizing sulfur-containing raw material
  • Method for deeply desulfurizing sulfur-containing raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0103] This embodiment adopts figure 1 The process flow shown is for advanced desulfurization treatment of gasoline raw material A.

[0104] The gasoline raw material A has a distillation range of 60-120° C. and a sulfur content of 400 μg / g.

[0105] In the solvent extraction system, the gasoline raw material is subjected to solvent extraction distillation in a solvent extraction distillation tower to obtain desulfurized gasoline products and sulfur-containing solvents. The sulfur-containing solvent is then separated from the sulfide contained therein by distillation in a solvent recovery tower to obtain the solvent-extracted sulfur-containing material and the recovered solvent from which the sulfide has been removed:

[0106] In the solvent extraction distillation tower: the feed weight ratio of the extraction solvent to the gasoline raw material is 3:1, the temperature at the bottom of the tower is 170°C, the temperature at the top of the tower is 80°C, and the pressure at ...

Embodiment 2

[0113] This embodiment adopts figure 1 The process flow shown is for deep desulfurization of gasoline feedstock B.

[0114] The gasoline raw material B has a distillation range of 27-100°C and a sulfur content of 450 μg / g, among which the sulfur content of mercaptans is 50 μg / g.

[0115] And the gasoline raw material B is subjected to alkali washing pretreatment to wash away part of light mercaptans, and the alkali solution for alkali washing is a NaOH aqueous solution with a mass fraction of 15% by weight. The sulfur content in the gasoline raw material obtained after alkali washing is 425 μg / g, and the sulfur content in mercaptan is 25 μg / g.

[0116] In the solvent extraction system, solvent extraction distillation is performed on the gasoline raw material after alkali washing in the solvent extraction distillation tower to obtain desulfurized gasoline products and sulfur-containing solvents. The sulfur-containing solvent is then separated from the sulfide contained therei...

Embodiment 3

[0124] Present embodiment adopts the technological process similar to embodiment 1 to carry out, difference is:

[0125] The raw material used in this example is gasoline raw material C, and the distillation range of gasoline raw material C is 33-205° C., and the sulfur content is 253 μg / g.

[0126] The extraction solvent that uses is the mixed solvent (wherein, the massfraction of ethylenediamine is 5% by weight, the mixed solvent (wherein, the massfraction of ethylenediamine is 5% by weight) of the sulfolane containing ethylenediamine (EDA) and N-methyl-2-pyrrolidone, and the mixture mark is 95% (75SULF / 25NMP )+5%EDA).

[0127] All the other are the same as in Example 1.

[0128] As a result, the sulfur content of the resulting gasoline product was ≯10 μg / g.

[0129] Moreover, in this embodiment, since the extraction solvent containing additives is used in the extraction distillation, the effective utilization rate of the extraction solvent is significantly improved, the f...

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Abstract

The invention relates to the field of refining of hydrocarbon materials, and discloses a method for deeply desulfurizing a sulfur-containing raw material. The method is characterized in that solvent extraction of the sulfur-containing raw material and an extracting solvent is carried out through distillation to obtain a sulfur-containing solvent and a desulfurized product, wherein the extracting solvent contains a main extracting solvent and an assistant, the assistant is at least one substance of alcohols, ketones, organic acids and organic nitrides being intermiscible with the main extracting solvent and having a boiling point or a dry point being not more than the boiling point or the dry point of the main extracting solvent and/or water, and the organic nitrides are at least one of amines, carbamides and hydramines. The method can deeply remove sulfides from the sulfur-containing raw material, such as gasoline even under a hydrogen source-free or hydrogen source-deficient condition, and achieves basic no loss of the octane number.

Description

technical field [0001] The invention relates to the field of refining hydrocarbon materials, in particular to a method for deep desulfurization of sulfur-containing raw materials. Background technique [0002] As we all know, the emission of toxic and harmful substances in automobile exhaust seriously affects the air quality. For this reason, countries all over the world have set stricter and stricter standards for the quality of oil used as engine fuel. From January 1, 2013, my country has implemented No. IV emission standards nationwide, and has implemented No. V emission standards in Beijing, Shanghai and other major cities. No. Ⅳ and No. Ⅴ emission standards respectively stipulate that the sulfur content in motor gasoline shall not exceed 50 μg / g and 10 μg / g. [0003] The sulfur in gasoline mainly comes from catalytic cracking gasoline. With the development of heavy oil processing raw materials, the sulfur content of catalytic cracking gasoline will further increase. T...

Claims

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Application Information

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IPC IPC(8): C10G7/08C10G7/12
CPCC10G7/08C10G7/12C10G2300/202C10G2300/305
Inventor 潘光成赵杰常春艳赵丽萍李涛吴明清陶志平
Owner CHINA PETROLEUM & CHEM CORP
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