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Divided-wall column rectification system and process

A technology of rectification system and dividing wall column, applied in fractionation, distillation separation, separation method, etc., can solve the problems of lack of design method operation and control scheme, affecting wide application, etc., to reduce energy consumption, save investment, and reduce occupation. land area effect

Inactive Publication Date: 2020-11-10
张家港保税区慧鑫化工科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the dividing wall tower has the above-mentioned remarkable advantages, it has been a long time since the concept of the dividing wall tower was proposed in the 1930s to its successful industrial application, which is mainly due to the lack of reliable design methods and feasible operations. and control schemes, thus affecting its wide application

Method used

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  • Divided-wall column rectification system and process
  • Divided-wall column rectification system and process
  • Divided-wall column rectification system and process

Examples

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example 2

[0058] The raw material is: aromatics extraction feed,

[0059] The product is: tower top product (light component) benzene product;

[0060] Side line extraction (middle component) toluene product;

[0061] Bottom product (heavy component) heavy aromatic products.

[0062] Product index requirements:

[0063] Light components: benzene product (overhead product);

[0064] Index: greater than 99.9% by mass;

[0065] Middle component: toluene product (side mining);

[0066] Index: more than 99.9% by mass.

[0067] The dividing wall column is designed as follows: 22 top trays are arranged in the tower top area, 55 pre-fractionation trays are arranged in the pre-fractionation area), 53 main fractionation trays are arranged in the main fractionation area, and 23 bottom trays are arranged at the bottom of the tower. The 24th from top to bottom of the pre-fractionation tray is the feed tray, and the 40th from top to bottom of the main fractionation tray is the extraction tray, ...

example 3

[0074] The raw material is: reformed oil feed

[0075] The product is: tower top product (light component) C6 / C7 product;

[0076] Side line extraction (medium component) xylene product;

[0077] Bottom product (heavy component) C9+ product.

[0078] Product index requirements:

[0079] Light components: C6 / C7 products (top products);

[0080] Index: C8 aromatics content ≤ 0.5wt%;

[0081] Middle component: xylene product (side mining);

[0082] Index: C8 aromatics content ≥ 99.3wt%, C8 aromatics recovery ≥ 99%;

[0083] Heavy components: C9+ products;

[0084] Index: C8 aromatic hydrocarbon content≤0.5wt%.

[0085] The design of the dividing wall column is as follows: 13 top trays are set in the top area of ​​the tower, 67 pre-fractionation trays are set in the pre-fractionation area, 65 main fractionation trays are set in the main fractionation area, and 48 bottom trays are set in the bottom of the tower. The 38th from top to bottom of the pre-fractionation tray is t...

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Abstract

The invention relates to a divided-wall column rectification system which comprises a feeding pipeline, a feeding and discharging heat exchanger, a divided-wall column, a light component discharging pipeline, a condenser, a condensation tank, a middle component discharging pipeline, a middle component product pump and a heavy component discharging pipeline. A partition plate is vertically arrangedin the middle in the divided-wall column, and the divided-wall column comprises a column top area, a pre-fractionation area, a main fractionation area and a column bottom area. The feeding pipeline is connected to a pre-fractionation area feeding hole of the divided-wall column after passing through the fed and discharged material heat exchanger. A light component outlet at the column top area ofthe divided-wall column is connected with the light component discharging pipeline and is connected to the condenser and the condensation tank. The main fractionation area of the divided-wall columnis provided with a middle component outlet and is connected with the middle component discharging pipeline and the middle component product pump. A heavy component outlet is formed in the column bottom area of the divided-wall column and is connected with the heavy component discharging pipeline, and the heavy component discharging pipeline is connected to the fed and discharged material heat exchanger for heat recovery. According to the invention, three-product single-tower separation can be realized, the occupied area is reduced, the investment is reduced, the operation is easy, and an idealproduct separation effect can be achieved.

Description

technical field [0001] The invention belongs to the technical field of dividing wall towers, in particular to a rectifying system and process of dividing wall towers. Background technique [0002] Distillation technology is the most widely used unit operation in the chemical industry. Although it has many advantages, it is also a part of high energy consumption and investment in industrial processes. more than half. Therefore, the separation efficiency of the rectification tower can be improved by designing a new tower structure, while reducing energy consumption. The most representative one is the dividing wall column, which refers to setting a vertical partition inside the rectification column to divide the rectification column into the top section, the bottom section, the feed section and the middle side line separated by the partition There are four main parts in the product extraction section. Generally speaking, for the separation of a ternary mixture, the separatio...

Claims

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Application Information

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IPC IPC(8): B01D3/14B01D3/32B01D3/42
CPCB01D3/141B01D3/322B01D3/324B01D3/42Y02P70/10
Inventor 吕云飞王鑫邓宏达昝大鑫刘哲
Owner 张家港保税区慧鑫化工科技有限公司
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