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Method for separating benzene in mixing hydrocarbon

A technology for mixing hydrocarbons and benzene, applied in distillation purification/separation, organic chemistry, etc., can solve the problems of many equipment, high energy consumption, heavy equipment maintenance workload, etc., and achieve the effect of simple equipment and low energy consumption

Inactive Publication Date: 2015-02-25
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This method has a lot of equipment, so it consumes a lot of energy, and the workload of equipment maintenance is large, so it needs to be further improved appropriately.

Method used

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  • Method for separating benzene in mixing hydrocarbon
  • Method for separating benzene in mixing hydrocarbon
  • Method for separating benzene in mixing hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This example uses the attached figure 1 In the case of recovery of benzene in the process, the raw material mixed hydrocarbon feed rate is 8.2 tons / hour, and the feed composition is: non-aromatic hydrocarbons (mainly C5 and C6 naphthenes) 35wt%, benzene 64.98wt%, other benzene homologues 0.02 wt%, and the feed temperature is 90°C. The extractant feed temperature was 95°C. A side column (extractive distillation column) has 30 theoretical plates, the feed position is on the 18th plate, the extractant feed position is the 4th plate, the A-side tower top reflux ratio is 2, and the solvent ratio is 1.3. The pressure at the top of the A side tower is 0.1Mpa, and the temperature at the top of the tower is 80.5°C. The theoretical plate of the B side tower is 10, there is no reflux at the top of the tower, and the temperature at the top of the tower is 81°C. The temperature of the common tower kettle is 280°C. The content of aromatics in the non-aromatics separated at the to...

Embodiment 2

[0030] This example is attached figure 2 In the case of recovery of benzene in the process, the raw material mixed hydrocarbon feed rate is 8.15 tons / hour, and the feed composition is: non-aromatic hydrocarbons (mainly C5 and C6 naphthenes) 45wt%, benzene 54.95wt%, other benzene homologues 0.05 wt%, and the feed temperature is 90°C. The extractant feed temperature was 95°C. A side column (extractive distillation column) has 30 theoretical plates, the feed position is on the 18th plate, the extractant feed position is the 4th plate, the top reflux ratio is 2.5, the solvent ratio is 1.4, the top The pressure is 0.0355Mpa, and the temperature at the top of the tower is 47.3°C. The B-side column has 10 theoretical plates, the top reflux ratio is 0.7, and the top temperature is 49.6°C. The temperature of the common tower kettle is 243°C. The content of aromatics in the non-aromatics separated at the top of the tower is 130ppm, and the purity of the separated benzene product is...

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Abstract

The present invention relates to a method for separating benzene in a mixing hydrocarbon, and belongs to the field of petrochemical industry. According to the present invention, a separation wall extraction rectification tower is adopted to complete the process, wherein the internal of the separation wall tower is divided into three parts, the middle part is a separation wall, the separation wall can be a separation plate, the separation plate can directly extend from the top and does not contact the bottom, or can extend from the upper part of the tower to the lower part of the tower, the upper part and the lower part of the separation wall do not contact the top and the bottom of the tower, and the upper part of the separation wall benzene outlet side is sealed, and is not connected with the top space. In addition, characteristics of simple device and lower energy consumption are provided, and energy can be saved by more than 10% compared with the conventional process.

Description

technical field [0001] The invention belongs to the field of petrochemical industry and relates to a method for obtaining benzene from mixed hydrocarbons by using a dividing wall extractive distillation tower and using sulfolane as an extraction agent. Background technique [0002] Benzene and its homologues are important petrochemical raw materials. There are many ways to produce benzene. Among them, benzene from catalytic reforming and pyrolysis gasoline each account for 38% of the world's total benzene production, toluene disproportionation accounts for 13%, and toluene hydrogenation dehydrogenation Alkylation accounted for 6%, and another 5% came from the coking process. Among them, the processes for recovering benzene from catalytic reforming and pyrolysis gasoline mainly include liquid-liquid extraction and extractive distillation. However, due to recent studies, it has been found that the operation cost of liquid-liquid extraction is relatively high and uneconomical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/04C07C7/08
Inventor 叶青裘兆蓉秦继伟熊晓娟
Owner CHANGZHOU UNIV