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Method for extracting rectifying and separating benzene

A technology of extractive distillation and extractive distillation column, which is applied in the field of extractive distillation and separation of benzene, can solve the problems of operation fluctuation, unqualified color number of pickling, and increase of production cost.

Active Publication Date: 2007-09-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that when dealing with raw materials with high olefin content, such as continuous reforming to produce oil, the quality of the obtained benzene product is unstable
When the composite solvent is used to extract and distill benzene from pyrolysis hydrogenated gasoline, it can significantly ease the operating conditions of solvent recovery, improve the recovery rate of aromatics, and obtain high-quality pure benzene. However, when the raw material is continuous reforming to produce oil, the benzene product The pickling color number is unqualified, even if it is refined by clay, when the mass space velocity of the clay tower feed is 0.5 hours -1 At this time, the device runs for about two weeks, and the pickling color number of the benzene product will be greater than 3 and unqualified, and the clay needs to be replaced, which will cause operational fluctuations and increase production costs.

Method used

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  • Method for extracting rectifying and separating benzene
  • Method for extracting rectifying and separating benzene

Examples

Experimental program
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Effect test

example 1

[0025] According to the flow chart in Figure 1, to reform gasoline C 6The distillate is used as the raw material, and pure benzene is separated by extractive distillation, and sulfolane is used as the extraction solvent. The composition and flow rate of raw materials in the extractive distillation process are shown in Table 1, the main operating conditions are shown in Table 2, the circulation flow rate and heat exchange temperature of the solvent are shown in Table 3, and the separation results of extractive distillation are shown in Table 4. The pickling color number of the product is shown in Table 5, and the pickling color number is determined by the GB / T2012 method.

example 2～3

[0031] According to the flow chart of Fig. 1, the benzene cut that the solvent recovery tower top obtains is taken as raw material, and the influence of the number of theoretical plates on the top of the flash tank on the extraction and separation results is investigated. The composition of the benzene cut is shown in Table 6, the composition of the clay tower and the flash tank The operating conditions are shown in Table 7, and the separation results are shown in Table 8.

[0032] From the data in Table 8, it can be seen that when the number of theoretical plates on the top of the flash tank is 0 or 5, the benzene product with qualified pickling color number can be obtained, but the yield of benzene is low when the number of theoretical plates is 0.

[0033] project

[0034] project

[0035] project

[0036] project

[0037] Total heat consumption refers to the sum of extractive distillation and benzene refining heat.

[0038] table...

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Abstract

A process for separating benzene by extracting rectifying includes such steps as adding the hydrocarbon mixture containing olefin and benzene into extracting-rectifying tower, contacting with extracting solvent for extracting rectifying, discharging the extracting solvent containing benzene from bottom, adding it into solvent recovering tower for separating benzene from solvent, discharging benzene fraction from its top, condensing, refining in argil tower, flash evaporation in flash tower, discharging the substance from its top, and condensing to obtain benzene.

Description

technical field [0001] The invention relates to a method for extracting and rectifying the separation of benzene, specifically, a method for extracting and rectifying the separation of benzene from hydrocarbon mixtures containing olefins. Background technique [0002] There are two main methods for separating benzene from reformed oil and pyrolysis hydrogenated gasoline. One is liquid-liquid extraction, and the other is extractive distillation. The liquid-liquid extraction method currently uses water-containing sulfolane as the extraction solvent. Its disadvantage is that it is not suitable for raw materials with high aromatic content, and the benzene separated by extraction will affect its freezing point due to water content. More benzene towers, water is separated at the top of the benzene tower, pure benzene is obtained from the side line, and a small amount of heavy impurities are discharged from the bottom of the tower. The process of extracting and separating benzene...

Claims

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Application Information

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IPC IPC(8): C07C7/08C07C15/04B01D3/40
Inventor 赵明田龙胜唐文成
Owner CHINA PETROLEUM & CHEM CORP
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