Technological method for separating methanol, acetonitrile and benzene tertiary mixture

A process method and a mixture technology, applied in chemical instruments and methods, preparation of organic compounds, distillation purification/separation, etc., can solve difficult separations, cannot fully meet the separation requirements of ternary azeotropic systems, have no separation methods and Technology and other issues

Inactive Publication Date: 2013-07-24
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is azeotropy between most solvents, which makes the separation process difficult
In recent years, there have been many effective separation methods for binary azeotropic systems, but the separation of three-component systems is extremely difficult due to the more complicated relationship between components and forces.
The separation method of the binary azeotrope system can no longer fully meet the separation requirements of the ternary azeotrope system
Moreover, the three-component mixture will form a ternary azeotrope, making separation very difficult
So far, there are no related articles and patents on the method and process of the separation of the three-component system

Method used

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  • Technological method for separating methanol, acetonitrile and benzene tertiary mixture

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Experimental program
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Effect test

Embodiment 1

[0033] Raw material composition: methanol: acetonitrile: benzene = 70%: 20%: 10% (mass concentration), the feed temperature of the raw material liquid is normal temperature, and the feed is fed from the 25th tray of the primary separation tower 1, and the feed flow rate is 1000kg / h; Methanol is introduced from the third tray of the primary separation tower, the feed temperature is normal temperature, and the flow rate is 1000kg / h. The output of light components at the top of the primary separation tower is 400kg / h, analyzed by gas chromatograph, methanol:benzene=78:22 (mass concentration); the output of heavy components at the bottom of the tower is 1600kg / h, analyzed by gas chromatograph Analysis, methanol: acetonitrile = 87:12 (mass concentration). The operating pressure of the primary separation tower 1 is normal pressure, the number of trays is 40, the top temperature is 60.0°C, the kettle temperature is 63.3°C, and the reflux ratio is 2.

[0034] The top component of th...

Embodiment 2

[0037] Other steps, parameter are with embodiment 1, difference is:

[0038] The operating pressure of the benzene tower 5 is normal pressure, the top temperature is 61.3° C., the kettle temperature is 80.6° C., the output of the tower top is 115 kg / h, and the output of benzene at the bottom of the tower is 15 kg / h.

[0039] The operating pressure of the acetonitrile column 3 is normal pressure, the top temperature is 61.5° C., the kettle temperature is 81.0° C., the output of the tower top is 660 kg / h, and the output of benzene at the bottom of the tower is 40 kg / h.

Embodiment 3

[0041] Other steps, parameter are with embodiment 1, difference is:

[0042] Raw material composition: methanol: acetonitrile: benzene = 60%: 30%: 10% (mass concentration), solvent flow rate is 1200kg / h. The output of light components at the top of primary separation tower 1 is 500kg / h, analyzed by gas chromatography, methanol:benzene=82:18 (mass concentration); the output of heavy components at the bottom of the tower is 1700kg / h, analyzed by gas chromatography Instrument analysis, methanol: acetonitrile = 82:18 (mass concentration). The top temperature of the primary separation tower 1 is 60.2°C, and the kettle temperature is 63.3°C.

[0043] The top temperature of the second low-pressure methanol tower 4 is 21.3°C, the kettle temperature is 28.3°C, the output of methanol and benzene binary mixture at the top of the tower is 150kg / h, and the output of methanol at the bottom of the tower is 350kg / h, and the mass concentration is 99.4 %. The top temperature of benzene tower...

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Abstract

The invention relates to a technological method for separating a methanol, acetonitrile and benzene tertiary mixture. According to the method, a preliminary separating column is arranged, and methanol is introduced to change a distillation area of the mixture so that the distillation end point develops towards a methanol-benzene binary mixture, wherein the acetonitrile content of the mixture is nearly 0 when the mixture enters a difficult separating area, and thus methanol-benzene is extracted from a column top and methano-acetonitrile is extracted from a column bottom. By utilizing the method, a tertiary material system is decomposed into two binary material systems under the condition of not introducing a fourth material; the methanol-benzene mixture which is extracted from the column top can be decomposed so as to respectively obtain over 99.0% of the methanol and over 99.0% of benzene through pressure-swing distillation; and a methano-acetonitrile mixture which is extracted from the column bottom can be decomposed so as to respectively obtain over 99.0% of the methanol and over 99.0% of acetonitrile through pressure-swing distillation.

Description

technical field [0001] The invention relates to a method for separating a three-component mixture, in particular to a method for effectively separating methanol, acetonitrile and benzene mixture without adding an external solvent. Background technique [0002] Methanol, acetonitrile, and benzene are excellent organic solvents, and are raw materials for synthetic fuels, paints, medicines, pesticides, and various petrochemical products, and are widely used in many industries such as organic synthesis, plastics, resins, and medicine. When industrially producing a certain cephalosporin intermediate, the intermediate product needs to be treated with acetonitrile-benzene mixture, so part of the acetonitrile-benzene is mixed with the intermediate product, and methanol needs to be added for the next reaction. After the reaction, the waste liquid is separated into methanol , a mixture of acetonitrile and benzene. However, there is azeotropy between most solvents, which makes the sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/80C07C255/03C07C253/34C07C15/04C07C7/04B01D3/14
Inventor 李春利宗丽丽方静刘婧
Owner HEBEI UNIV OF TECH
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