Method for refining petrobenzene and thiophene by using ionic liquid complex solvent

A technology of ionic liquid and composite solvent, which is applied in extraction and purification/separation, organic chemistry, bulk chemical production, etc. It can solve the problems of inability to process acid tar and waste residue, complex catalytic hydrogenation process, and low efficiency of thiophene recovery. Remarkable energy saving effect, low steam pressure, and reduced benzene loss

Inactive Publication Date: 2014-03-26
TIANJIN CLEANTECH TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] Although the crude benzene refining technology by pickling method has simple process, mild operating conditions and wide application range, it destroys thiophene with high industrial value. The use of this technology is expressly prohibited; the catalytic hydrogenation process is complicated, the equipment investment is large, and the reaction conditions are harsh. The hydrogenation of some products leads to low yields, and it is impossible to recover valuable thiophene resources. The high requirements for catalyst performance also limit this method. industrial applications
In recent years, the crude benzene refining technology based on extractive distillation has been developed in the industry, and a lot of improvement work has been done in the production process to improve the purity of benzene, but the recovery efficiency of thiophene is not high

Method used

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  • Method for refining petrobenzene and thiophene by using ionic liquid complex solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Attached figure 1 The process flow shown uses coking crude benzene produced by a coking plant as raw material, and the composition is: 64.8% benzene (mass content, the same below), 5.2% thiophene, and the rest are light and heavy components.

[0024] Pretreatment process:

[0025] (1) Coking crude benzene first removes light components in the light removal tower. The operating pressure of the light removal tower is 101kPa, the temperature at the top of the tower is 80°C, and the temperature of the bottom of the tower is 100°C. Light components with a boiling point lower than benzene are extracted from the top of the tower , mainly H2S, CS2, pentene, methylethylene, cyclopentane, hexene, hexane, methylcyclopentane and other unsaturated hydrocarbons.

[0026] (2) The material from the tower tank of the light removal tower enters the weight removal tower to remove heavy components. The operating pressure of the weight removal tower is 50kPa, the temperature at the top of ...

Embodiment 2

[0036] Attached figure 1 Shown technological process, raw material is with embodiment 1.

[0037] Pretreatment process:

[0038] (1) Coking crude benzene first removes light components in the light removal tower. The operating pressure of the light removal tower is 50kPa, the temperature at the top of the tower is 50°C, and the temperature of the bottom of the tower is 90°C. Light components with a boiling point lower than benzene are extracted from the top of the tower, mainly It is unsaturated hydrocarbons such as H2S, CS2, pentene, methylethylene, cyclopentane, hexene, hexane, methylcyclopentane, etc., and the materials in the tower reactor enter the de-weighting tower;

[0039] (2) The material from the tower tank of the light removal tower enters the weight removal tower to remove heavy components. The operating pressure of the weight removal tower is 101kPa, the temperature at the top of the tower is 85°C, and the temperature of the tower tank is 105°C. The heavy compon...

Embodiment 3

[0049] The raw materials and operation steps are the same as in Example 1. The ionic liquid composite solvent is a composite solvent composed of 1-octyl-3-methylimidazole trifluorosulfonate and N-formylmorpholine at a mass ratio of 3:1, and the solvent ratio is 1 : 1, obtain 99.99% benzene product, its index such as color number, bromine value, crystallization point, sulfur and nitrogen impurity content all reach the petroleum benzene national standard primary standard, can replace petroleum benzene to use. The thiophene refining process yields 99.8% thiophene products with a recovery rate of 97%.

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Abstract

The invention creates and provides a method for refining petrobenzene and thiophene by using an ionic liquid complex solvent. Coking crude benzene is pretreated to form crude benzene in a pretreatment procedure, crude benzene is extracted and rectified twice in the ionic liquid complex solvent during a benzene refining procedure to form a 99.99% benzene product and crude thiophene, a thiophene product with purity of more than 99.7% is also obtained by extracting and rectifying crude thiophene twice with the ionic liquid complex solvent in the thiophene refining procedure, yield is more than 97%, and all the ionic liquid complex solvent is recycled after being refined and recycled through a recovery tower. In the method, the quality of the benzene product reaches A-level standard of petrobenzene national standard, the benzene product can substitute petrobenzene in use, meanwhile, thiophene is recycled efficiently, and the economic benefit increased therefrom is more than 50%; the ionic liquid has good thermal stability, low vapor pressure and high polarity, the complex solvent formed by the ionic liquid has high selectivity, relative volatility among the constituents is increased, dosage of an extraction agent is reduced, and process energy consumption and production cost are respectively reduced by 25% and 40%, so that energy-saving effect is remarkable.

Description

technical field [0001] The invention relates to the technical field of coking crude benzene refining, in particular to a method for refining petroleum benzene and thiophene by using an ionic liquid composite solvent. Background technique [0002] Benzene is an important organic chemical raw material with a wide range of industrial uses, and its main source is crude benzene produced in coking and iron and steel industries. With the improvement of the chemical industry's requirements for the purity of benzene, it is more and more important to refine and deeply purify high-purity sulfur-free benzene. The composition of crude benzene is very complex, and the existence of sulfide thiophene seriously affects the refining effect of benzene. Thiophene is an important synthetic raw material for fine chemicals, mainly used in the production of medicines, dyes, cosmetics, etc. Since the existing crude benzene refining technology cannot recover thiophene, it can only rely on foreign i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/04C07C7/10C07D333/10
CPCY02P20/54
Inventor 张学岗张静安喜报迟娜
Owner TIANJIN CLEANTECH TECH
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