Method for separating acetonitrile-methanol-benzene ternary azeotrope through three-tower pressure-swing distillation

A benzene ternary azeotrope and pressure swing rectification technology, which is used in distillation purification/separation, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as increasing workload, ensure product quality, and reduce equipment. The effect of improving investment costs and economic benefits

Active Publication Date: 2016-01-20
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process operation process adds extractant, wh

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  • Method for separating acetonitrile-methanol-benzene ternary azeotrope through three-tower pressure-swing distillation
  • Method for separating acetonitrile-methanol-benzene ternary azeotrope through three-tower pressure-swing distillation
  • Method for separating acetonitrile-methanol-benzene ternary azeotrope through three-tower pressure-swing distillation

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Experimental program
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Embodiment 1

[0030] Feed flow rate 1000kg / h, temperature 25°C, pressure 3atm, mass composition: acetonitrile 20%, methanol 70%, benzene 10%. The effective theoretical plate number of the acetonitrile column is 55, the raw material liquid is introduced from the 27th plate, the circulating feed position is the 28th plate, the operating pressure is 3atm, the reflux ratio is 2.4, and the column diameter is about 1000mm; the effective theoretical plate of the methanol column The number is 50, and the production liquid at the top of the acetonitrile tower is introduced from the 12th plate, the operating pressure is 1atm, the reflux ratio is 1.6, and the tower diameter is about 900mm; The outlet liquid is introduced by the 11th plate, the operating pressure is 8atm, the reflux ratio is 1.1, and the tower diameter is about 750mm.

[0031] See Table 1 for process operating parameters, and Table 2 for feed and product logistics. It can be seen from the data in the table that after treatment, the re...

Embodiment 2

[0037] Feed flow rate 1200kg / h, temperature 25°C, pressure 3atm, mass composition: acetonitrile 20%, methanol 70%, benzene 10%. The effective theoretical plate number of the acetonitrile column is 54, the raw material liquid is introduced from the 36th plate, the circulating feed position is the 36th plate, the operating pressure is 3atm, the reflux ratio is 2.3, and the tower diameter is about 1000mm; the effective theoretical plate of the methanol tower The number is 47. The production liquid at the top of the acetonitrile tower is introduced from the 12th plate. The operating pressure is 1atm, the reflux ratio is 2.0, and the tower diameter is about 1000mm; The outlet liquid is introduced by the 13th plate, the operating pressure is 8atm, the reflux ratio is 1.0, and the tower diameter is about 750mm.

[0038] See Table 3 for process parameters and Table 4 for feed and product logistics. It can be seen from the data in the table that after treatment, the recovery rate of a...

Embodiment 3

[0044] Feed flow rate 800kg / h, temperature 25°C, pressure 3atm, mass composition: 20% acetonitrile, 70% methanol, 10% benzene. The effective theoretical plate number of the acetonitrile column is 42, the raw material liquid is introduced from the 30th plate, the circulating feeding position is the 29th plate, the operating pressure is 3atm, the reflux ratio is 1.3, and the column diameter is about 850mm; the effective theoretical plate of the methanol column The number is 44, the production liquid at the top of the acetonitrile tower is introduced from the 13th plate, the operating pressure is 1atm, the reflux ratio is 1.5, and the tower diameter is about 900mm; The outlet liquid is introduced from the eighth plate, the operating pressure is 8atm, the reflux ratio is 0.8, and the tower diameter is about 700mm.

[0045] See Table 5 for process operating parameters, and Table 6 for feed and product logistics. It can be seen from the data in the table that after treatment, the r...

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Abstract

The invention relates to a method for separating an acetonitrile-methanol-benzene ternary azeotropic system through three-tower pressure-swing distillation. An acetonitrile-methanol-benzene raw material mixed liquor 1 is delivered to an acetonitrile tower T1 via a pressure pump P1 so as to obtain an acetonitrile product 2 at the bottom of the tower, steam at the top of the tower is condensed by a condenser, a part of the steam flows back to the acetonitrile tower T1, and a part of a material flow 5 is conveyed a methanol tower T2 after pressure reduction by a pressure-reducing valve V1; a methanol product 3 is obtained at the bottom of the methanol tower T2, steam at the top of the tower T2 is condensed by a condenser, a part of the steam flows back to the methanol tower T2, and a part of a material flow 7 is conveyed to a benzene tower T3 after pressurization by a pump P2; a benzene product 4 is obtained at the bottom of the benzene tower T3, steam at the top of the tower T3 is condensed by a condenser, a part of the steam flows back to the benzene tower T3, and a part of material flow 9 cyclically returns to the acetonitrile tower T1 via a pressure-reducing valve 2; and the purities and the recovery rates of the acetonitrile product, the methanol product and the benzene product are all greater than 99.90 wt% and 99.50 wt%, respectively. The method provided by the invention can substantially reduce energy consumption in separation process, improves product purity and yield, is simple and uses reasonable apparatuses.

Description

【Technical field】 [0001] The invention belongs to the field of chemical separation and purification, and in particular relates to a method for separating acetonitrile-methanol-benzene ternary azeotrope through three-tower pressure-swing rectification. 【Background technique】 [0002] Methanol (CH 3 OH) is the basic organic chemical raw material and excellent fuel, acetonitrile (CH 3 CN) and benzene (C 6 h 6 ) are excellent organic solvents, widely used in fine chemicals, plastics, pharmaceuticals and many other industries. During the industrial production of a certain cephalosporin intermediate, a ternary mixture containing acetonitrile, methanol and benzene will be produced. Due to the azeotrope between acetonitrile, methanol and benzene under normal pressure, and the formation of a ternary azeotrope among the three components, it is difficult to separate them efficiently by ordinary distillation methods. [0003] The patent (201310140409.9) provides a process for separ...

Claims

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Application Information

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IPC IPC(8): C07C255/03C07C253/34C07C31/04C07C29/80C07C15/04C07C7/04
Inventor 朱兆友徐东芳李英生李鑫王英龙魏亿萍
Owner QINGDAO UNIV OF SCI & TECH
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