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Method for producing white oil by coal tar hydrogenation

A technology of coal tar and hydrogenation tail oil, which is applied in tar processing, tar processing by distillation, tar extraction by chemical method, etc. It can solve problems such as high content of metal and mechanical impurities, affecting the operation cycle of hydrogenation equipment, etc. , to achieve the effect of increasing saturation conversion rate, reducing nitrogen content and lowering operating temperature

Active Publication Date: 2020-05-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies of the prior art, the present invention provides a method for producing white oil by hydrogenation of coal tar, which can convert low-quality and cheap coal tar fractions into high value-added crude white oil products, and solve the problem of coal tar raw materials The high content of metals and mechanical impurities affects the operation cycle of the hydrogenation unit, reduces the reaction temperature of the hydrogenation process, reduces energy consumption, and improves safety

Method used

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  • Method for producing white oil by coal tar hydrogenation
  • Method for producing white oil by coal tar hydrogenation
  • Method for producing white oil by coal tar hydrogenation

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] The raw material of coal tar and the oil produced by hydrocracking are mixed according to the natural ratio to obtain the mixture flow, and then mixed with the sulfuric acid solution with a concentration of 6% in the ratio of 1:5 in the pickling cyclone mixing-separator, and pickling treatment is carried out. At the same time, oil-water separation is completed to obtain an aqueous phase and an oil phase. The oil phase and distilled water enter the water-washing cyclone mixer-separator at a ratio of 1:5. While washing with water, the oil-water separation is completed to obtain the water phase and the feed to the hydrofining reactor. The feed to the hydrofinishing reactor is mixed with hydrogen and enters the hydrofinishing reactor, where it contacts with the hydrofinishing catalyst to undergo reactions such as hydrodesulfurization, hydrodenitrogenation, and saturation of aromatic hydrocarbons. The resulting oil enters the high-pressure separator and is separated to obtain...

Embodiment 2

[0036] Coal tar raw material and hydrocracking oil are mixed at a ratio of 4:3 to obtain a mixture stream, which is then mixed with a sulfuric acid solution with a concentration of 6% at a ratio of 1:5 in a pickling cyclone mixing-separator for acid washing. Washing treatment, complete oil-water separation at the same time, to obtain aqueous solution phase and oil phase. The oil phase and water enter the water-washing cyclone mixer-separator at a ratio of 1:5. While washing with water, the oil-water separation is completed to obtain the water phase and the feed to the hydrofining reactor. The feed to the hydrofinishing reactor is mixed with hydrogen and enters the hydrofinishing reactor, where it contacts with the hydrofinishing catalyst to undergo reactions such as hydrodesulfurization, hydrodenitrogenation, and saturation of aromatic hydrocarbons. The resulting oil enters the high-pressure separator and is separated to obtain After the purified hydrogen is recycled by the ci...

Embodiment 3

[0038] Coal tar raw material and hydrocracking oil are mixed at a ratio of 5:4 to obtain a mixture stream, which is then mixed with an 8% sulfuric acid solution at a ratio of 1:4 in a pickling cyclone mixing-separator for acid washing. Washing treatment, complete oil-water separation at the same time, to obtain aqueous solution phase and oil phase. The oil phase and water enter the water-washing cyclone mixer-separator at a ratio of 1:5. While washing with water, the oil-water separation is completed to obtain the water phase and the feed to the hydrofining reactor. The feed to the hydrofinishing reactor is mixed with hydrogen and enters the hydrofinishing reactor, where it contacts with the hydrofinishing catalyst to undergo reactions such as hydrodesulfurization, hydrodenitrogenation, and saturation of aromatic hydrocarbons. The resulting oil enters the high-pressure separator and is separated to obtain After the purified hydrogen is recycled by the circulating hydrogen comp...

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Abstract

The invention discloses a method for producing white oil from coal tar. The method comprises the following steps: (1) mixing a coal tar raw material with oil generated by a hydrocracking unit to obtain a mixture flow A, and sequentially carrying out acid washing treatment and water washing treatment to obtain a hydrofining unit feed; (2) feeding the hydrofining unit feed and hydrogen into a hydrofining unit, contacting with a hydrofining catalyst, carrying out a hydrogenation reaction, and fractionating the hydrogenation reaction product to obtain naphtha, No.3 crude white oil, No.5 crude white oil, hydrogenated tail oil and other fractions; and (3) feeding the hydrogenated tail oil obtained in step (2) into a hydrocracking unit, and contacting the hydrogenated tail oil with a hydrocracking catalyst for a hydrocracking reaction to obtain generated oil. Inferior and cheap coal tar fractions can be converted into crude white oil with high additional value, the problem that the operationperiod of a hydrogenation device is influenced due to high content of metal, mechanical impurities and the like in the coal tar raw material is solved, the reaction temperature in the hydrotreatmentprocess is reduced, the energy consumption is reduced, and the safety is improved.

Description

technical field [0001] The invention relates to the field of coal tar processing and utilization, in particular to a method for producing white oil through hydrogenation of coal tar. Background technique [0002] With the rapid development of modern coal chemical industry (leading by coal gasification), such as coal-to-natural gas, coal-to-methanol, coal-to-olefins, coal-to-ethylene glycol, coal-to-aromatics and coal-to-oil, etc., coal tar is especially Coal tar production presents a rapid growth trend. [0003] At present, the ways of processing and utilizing coal tar in foreign countries are mainly divided into the following aspects: First, the extraction of monomer products is the main method. Industrialization mainly produces chemical products such as phenol, refined naphthalene, and anthraquinone; the second is mainly the deep processing of asphalt, represented by Mitsubishi Corporation of Japan, Rilly of the United States and Koppars of Australia, the main purpose of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10C1/20C10C1/14
CPCC10C1/14C10C1/20C10C1/205
Inventor 彭冲杜艳泽白振民孙士可隋宝宽
Owner CHINA PETROLEUM & CHEM CORP
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