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Benzene-propyl alcohol azeotrope continuous extractive distillation technology based on choline chloride/urea low co-melting solvent

A technology of low eutectic solvent and choline chloride, which is applied in the preparation of hydroxyl compounds, distillation purification/separation, and preparation of organic compounds, etc., achieving the effects of low cost, novel technology and low operation difficulty

Inactive Publication Date: 2015-09-02
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low eutectic solvent that adopts in the present invention is choline chloride / urea, does not have the patent or bibliography of its application in benzene-propanol azeotropic system at present

Method used

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  • Benzene-propyl alcohol azeotrope continuous extractive distillation technology based on choline chloride/urea low co-melting solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of benzene and propanol azeotrope continuous extraction and rectification process based on choline chloride / urea low eutectic solvent, its process flow chart is as follows figure 1 shown. The number of trays in T1 is 50, 90wt% ethylene glycol and 10wt% choline chloride / urea are used as extractants, and they are added from the third tray with a flow rate of 300kg / hr. The mixture of benzene and propanol is added from the 40th tray, the flow rate is 100kg / hr, and the mass fraction of benzene is 80%. Operated under normal pressure, the reflux ratio at the top of the tower is controlled at 3:1, the temperature at the top of the tower is 79.5-81°C, and the temperature at the bottom of the tower is 187-189°C. After analysis, the top product is benzene with a purity higher than 99%. The bottom of the tower enters into T2. T2 has 50 trays, the reflux ratio is 4:1, the feed is from the 40th tray, the operating condition is normal pressure, the temperature at the top of t...

Embodiment 2

[0021] The two-tower process flow of the extractive distillation tower is the same as that in Example 1. Use 85wt% ethylene glycol and 15wt% choline chloride / urea as the extractant, the number of trays is 30, feed from the third tray, and the flow rate is 200kg / hr. The mixture of benzene and propanol is added from the 22nd theoretical plate, the flow rate is 100kg / hr, and the composition is the same as that of Example 1. T1 operates at normal pressure with a reflux ratio of 3:1. At this time, the temperature at the top of the tower is 79.5-81°C, and the temperature at the bottom of the tower is 187-189°C. The top product was analyzed by gas chromatography to obtain a benzene product with a purity higher than 99%. The number of trays in T2 is 60, and other operating conditions are the same as in Example 1, and the bottoms of the tower are returned to T1 for recycling.

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Abstract

The invention relates to a benzene-propyl alcohol azeotrope continuous extractive distillation technology based on a choline chloride / urea low co-melting solvent. The benzene-propyl alcohol azeotrope continuous extractive distillation technology based on the choline chloride / urea low co-melting solvent is characterized in that a mixed solution of ethylene glycol and choline chloride / urea is taken as an extracting agent, the mass fraction of choline chloride / urea is 5-15%, and an extractive distillation operation process is as follows: the operation condition of an extractive distillation tower is normal pressure, the mass ratio of the extracting agent to a feed solution is (1-4):1, the plate number is 20-50, the reflux ratio is controlled to be (1-7):1, the temperature of the tower top is controlled to be 79.5-81 DEG C, and the temperature of a tower kettle is controlled to be 187-189 DEG C; and the plate number of a solvent recycling tower is 30-60, the operation condition is normal pressure, the reflux ratio is controlled to be (4-8):1, the temperature of the tower top is controlled to be 96-98 DEG C, and the temperature of the tower bottom is controlled to be 195-197 DEG C. By adopting the benzene-propyl alcohol azeotrope continuous extractive distillation technology based on the choline chloride / urea low co-melting solvent, high-purity benzene and propyl alcohol products can be finally obtained, and the advantages of simple operation, low cost and small environmental stress can be realized.

Description

technical field [0001] The invention relates to a continuous extraction and rectification process of benzene-propanol azeotrope based on choline chloride / urea low eutectic solvent, which is characterized in that the application of choline chloride / urea low eutectic solvent in the separation process . Background technique [0002] Benzene (C 6 h 6 ) is a basic petrochemical raw material, and the output of benzene and the technical level of production are one of the signs of a country's petrochemical development level. A series of compounds produced by benzene through substitution reaction, addition reaction, oxidation reaction, etc. can be used as raw materials for the production of plastics, rubber, fibers, dyes, detergents, insecticides, etc. About 10% of benzene is used as the basic raw material for the manufacture of benzene-based intermediates. The chemical structural formula of propanol is: CH 3 CH 2 CH 2 OH, widely used in industry. The benzene-propanol mixture...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/04C07C7/08C07C31/10C07C29/84
Inventor 姜占坤刘顺江孙国新冯佳亮
Owner UNIV OF JINAN
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