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Rectification and separation device and method

A technology of rectification and equipment, which is applied in the field of rectification and separation of isomers of nitrochlorobenzene, and can solve problems such as complex technology and huge investment

Active Publication Date: 2013-12-25
扬州通扬化工设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Huge investment and complex technology, only a small number of enterprises can achieve complete separation of m-nitrochlorobenzene, p-nitrochlorobenzene and o-nitrochlorobenzene

Method used

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  • Rectification and separation device and method

Examples

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Comparison scheme
Effect test

no. 1 example

[0035] According to the first embodiment of the present invention, the dividing wall column 1 is used to separate the nitrochlorobenzene raw material containing m-, p-, ortho-isomers, and the mixture is composed of 1% m-nitrochlorobenzene, 60% p-nitro Chlorobenzene and 39% o-nitrochlorobenzene composition. The mixture of m-, p-, o-nitrochlorobenzene enters the dividing wall column 1 with a bubble point of 1000kg / hr flow rate. The number of theoretical plates in the pre-separation tower is 118, and the feed plate is the 85th theoretical plate in the pre-separation tower area. The number of theoretical plates in the m-p-nitrochlorobenzene separation tower area is 236, of which 186 are in the rectifying section 4 at the top of the tower, and 50 are in the upper m-p-nitrochlorobenzene stripping section 8. The number of theoretical plates in the p- and o-nitrochlorobenzene separation tower area is 176, of which 95 are in the lower p- and o-nitrochlorobenzene rectification section ...

no. 2 example

[0037] According to the second embodiment of the present invention, a dividing wall column 1 is used to separate the nitrochlorobenzene raw material containing m-, p-, ortho-isomers, and the mixture is composed of 5% m-nitrochlorobenzene, 60% p-nitro Chlorobenzene and 35% o-nitrochlorobenzene composition. The mixture of m-, p-, o-nitrochlorobenzene enters the dividing wall column 1 with a bubble point of 1000kg / hr flow rate. The number of theoretical plates in the pre-separation tower is 93, and the feed plate is the 68th theoretical plate in the pre-separation tower area. The number of theoretical plates in the m- and p-nitrochlorobenzene separation tower area is 178, of which 113 are in the rectifying section 4 at the top of the tower, and 65 are in the upper m- and p-nitrochlorobenzene stripping section 8. The number of theoretical plates in the p- and o-nitrochlorobenzene separation tower area is 155, of which 78 are in the lower p- and o-nitrochlorobenzene rectification ...

no. 3 example

[0039] According to the third embodiment of the present invention, a dividing wall column 1 is used to separate the nitrochlorobenzene raw material containing m-, p-, ortho-isomers, and the mixture is composed of 15% m-nitrochlorobenzene, 67% p-nitro Chlorobenzene and 18% o-nitrochlorobenzene composition. The mixture of m-, p-, o-nitrochlorobenzene enters the dividing wall column 1 with a bubble point of 1000kg / hr flow rate. The number of theoretical plates in the pre-separation tower is 103, and the feed plate is the 55th theoretical plate in the pre-separation tower area. The number of theoretical plates in the m- and p-nitrochlorobenzene separation tower area is 163, of which 90 are in the rectifying section 4 at the top of the tower, and 73 are in the upper m- and p-nitrochlorobenzene stripping section 8. The number of theoretical plates in the p- and o-nitrochlorobenzene separation tower area is 147, of which 65 are in the lower p- and o-nitrochlorobenzene rectification ...

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Abstract

The invention discloses a rectification and separation device and method. The rectification and separation device and method are used for separating three isomers, namely m-nitrochlorobenzene, p-nitrochlorobenzene and o-dichlorobenzene. According to the device and the method, a rectifying tower is separated by a partition board arranged in the vertical direction, and majorized technology parameters are adopted, so that using one rectifying tower to complete whole separation of the m-nitrochlorobenzene, p-nitrochlorobenzene and o-dichlorobenzene is realized. Therefore, the rectification and separation device and method provided by the invention can reduce energy consumption, equipment investment and occupied area.

Description

technical field [0001] The present invention relates to the rectification separation of nitrochlorobenzene isomers, more specifically, relates to a kind of rectification equipment and Distillation method. Background technique [0002] In the production process of chemical products, the investment is often huge. The most complicated part is the separation and purification of the product mixture after the reaction. Almost all organic chemical production processes will be applied to the unit operation process of rectification. Distillation is very mature and widely used in modern chemical production process. However, the energy consumption of the rectification process is huge, and 40-70% of the energy consumption in the general chemical process is used to separate the product mixture, of which rectification accounts for more than 90%. With the continuous rise of energy prices, it is of great significance to study the energy-saving technology of the rectification process. It i...

Claims

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Application Information

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IPC IPC(8): B01D3/14C07C205/12C07C201/16
Inventor 李群
Owner 扬州通扬化工设备有限公司
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