Distillation equipment and method for separating dichlorobenzene isomers

A technology for isomers and dichlorobenzene, which is applied in the field of rectification and separation of dichlorobenzene isomers, and can solve the problems of huge investment, high number of theoretical plates, and complicated technology.

Active Publication Date: 2013-12-11
李群
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Huge investment, complex technology, and extremely high number of theoretical plates are required, so tha

Method used

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  • Distillation equipment and method for separating dichlorobenzene isomers

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no. 1 example

[0035] According to the first embodiment of the present invention, a dividing wall column 1 is used to separate the dichlorobenzene raw material containing m-, p-, ortho-isomers, and the mixture is composed of 8% m-dichlorobenzene, 46% p-dichlorobenzene and 46% o-dichlorobenzene composition. The mixture of m-, p-, ortho-dichlorobenzene 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 130, and the feed plate is the 82nd theoretical plate in the pre-separation tower area. The number of theoretical plates in the m-p-dichlorobenzene separation tower area is 280, of which 206 are in the rectifying section 4 at the top of the tower, and 74 are in the upper m-p-dichlorobenzene stripping section 8. The number of theoretical plates in the p- and o-dichlorobenzene separation tower area is 130, of which 50 are in the lower p- and o-dichlorobenzene rectification section 9, and 80 are in the botto...

no. 2 example

[0037] According to the second embodiment of the present invention, a dividing wall column 1 is used to separate the dichlorobenzene raw material containing m-, p-, ortho-isomers, and the mixture is composed of 54% m-dichlorobenzene, 24% p-dichlorobenzene and 22% o-dichlorobenzene composition. The mixture of m-, p-, ortho-dichlorobenzene 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 180, and the feed plate is the 69th theoretical plate in the pre-separation tower area. The number of theoretical plates in the m-p-dichlorobenzene separation tower area is 240, of which 85 are in the overhead rectifying section 4, and 155 are in the upper m-p-dichlorobenzene stripping section 8. The number of theoretical plates in the p- and o-dichlorobenzene separation tower area is 160, of which 96 are in the lower p- and o-dichlorobenzene rectification section 9, and 64 are in the bottom stripping s...

no. 3 example

[0039] According to the third embodiment of the present invention, a dividing wall column 1 is used to separate the dichlorobenzene raw material containing m-, p-, ortho-isomers, and the mixture is composed of 5% m-dichlorobenzene, 60% p-dichlorobenzene and 35% o-dichlorobenzene composition. The mixture of m-, p-, ortho-dichlorobenzene 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 83, and the feed plate is the 58th theoretical plate in the pre-separation tower area. The number of theoretical plates in the m-p-dichlorobenzene separation tower area is 278, of which 173 are in the top rectifying section 4, and 105 are in the upper m-p-dichlorobenzene stripping section 8. The number of theoretical plates in the p- and o-dichlorobenzene separation tower area is 155, of which 78 are in the lower p- and o-dichlorobenzene rectification section 9, and 77 are in the tower bottom stripping se...

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Abstract

The invention discloses distillation equipment and method for separating dichlorobenzene isomers. The distillation equipment comprises a dividing wall tower, a tower kettle reboiler and a tower top condenser, wherein the dividing wall tower comprises a middle tower region, a tower top distillation section arranged above the middle tower region and used for performing distillation and separation on m-dichlorobenzene and p-dichlorobenzene, and a tower kettle stripping section arranged below the middle tower region and used for stripping and separating m-dichlorobenzene and o-dichlorobenzene; the middle tower region is divided into a pre-separation tower region and a finished product separation tower region by a baffle plate arranged in a longitudinal direction; the pre-separation tower region is parallel to the finished product separation tower region; the pre-separation tower region comprises an upper feeding distillation section and a lower feeding stripping section; the finished product separation tower comprises an upper m-dichlorobenzene/p-dichlorobenzene stripping section and a lower p-dichlorobenzene/o-dichlorobenzene distillation section. According to the distillation equipment, the dichlorobenzene isomers, namely the m-dichlorobenzene, the p-dichlorobenzene and o-dichlorobenzene can be separated in a distillation tower through the dividing wall tower, so that the energy consumption, the equipment investment and the occupied area are reduced.

Description

technical field [0001] The present invention relates to the rectification separation of dichlorobenzene isomers, more specifically, relates to a rectification equipment and a rectification method using a dividing wall column to separate m-dichlorobenzene, p-dichlorobenzene and o-dichlorobenzene. 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 ...

Claims

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Application Information

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IPC IPC(8): B01D3/14C07C25/08C07C17/383
CPCY02P20/10Y02P20/50
Inventor 李群
Owner 李群
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