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Method for recovering aromatic hydrocarbons from hydrocarbons mixture with high content of aromatic hydrocarbons

A technology of hydrocarbon mixture and high aromatic hydrocarbons, applied in distillation purification/separation, azeotropic/extractive distillation, etc., can solve the problems of inability to overcome the limitation of aromatic hydrocarbon content, inability to handle raw materials, etc., to save equipment investment and operating costs, reduce The effect of equipment investment and improved operational efficiency

Active Publication Date: 2007-12-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is still unable to overcome the limitation of liquid-liquid extraction on the aromatic content of the raw material, and cannot handle raw materials with an aromatic content greater than 70% by weight

Method used

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  • Method for recovering aromatic hydrocarbons from hydrocarbons mixture with high content of aromatic hydrocarbons
  • Method for recovering aromatic hydrocarbons from hydrocarbons mixture with high content of aromatic hydrocarbons

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Embodiment

[0034] The process flow is shown in Figure 1. The raw material is the C6-C7 hydrocarbon mixture obtained after the pyrolysis hydrogenated gasoline is processed by the pre-fractionator. The aromatic content is 87%, and the flow rate is 37500kg / h. It is divided into two shares according to the weight ratio of 73.3:26.7 Hydrocarbon stream, wherein the first stream of hydrocarbon stream is introduced into the extraction distillation tower, and the second stream of hydrocarbon stream is introduced into the liquid-liquid extraction tower. Sulfolane is used as the aromatic hydrocarbon selective solvent, which contains a small amount of water. The raw material composition is shown in Table 1. The operating conditions of each tower See Table 2, and see Table 3 for the quality of recycled products and the total energy consumption of the device.

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Abstract

The process of recovering arene from hydrocarbon mixture with high arene content includes the following steps: separating the hydrocarbon mixture into two hydrocarbon flows; leading the first hydrocarbon flow to an solvent column for distilling extraction and exhausting the fat solvent from the bottom to a solvent recovering column; mixing the non-arene gas exhausted from the top of the solvent column with the second hydrocarbon flow and leading the mixture to a liquid-liquid extracting column, exhausting the non-arene component from the top, and steam stripping the fat solvent from the bottom of the column in a stripper and feeding the fat solvent to the solvent recovering column; separating arene from the arene selecting solvent in the solvent recovering column and obtaining arene mixture product in the top of the column; and returning the lean solvent to the liquid-liquid extracting column and the solvent column. The present invention has high arene yield and other advantages.

Description

technical field [0001] The invention relates to a method for extracting and separating aromatics from hydrocarbon mixtures, more specifically, to a method for recovering aromatics from hydrocarbon mixtures with high aromatics content by using a combined process of extractive distillation and liquid-liquid extraction. Background technique [0002] With the continuous development of petrochemical and textile industries, the world's demand for aromatic products continues to grow. Most of the sources of aromatics are oil produced by catalytic reforming in refineries and pyrolysis hydrogenated gasoline. The methods for separating aromatics from these two oils are mainly liquid-liquid extraction and extractive distillation. [0003] Liquid-liquid extraction is the process of selecting a suitable solvent to extract aromatics from aromatics-rich hydrocarbon fractions such as catalytic reforming oil. The higher the solubility and selectivity of the solvent for aromatics, the better ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/08C07C7/08
Inventor 刘劲松施昌智薛范王瑾
Owner CHINA PETROLEUM & CHEM CORP
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