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Middle steam compression two-section type partition wall tower

A partition tower, two-stage technology, applied in the chemical industry, can solve the problems of large temperature difference, large compression ratio, and inability to have high thermodynamic efficiency, and achieve the effect of reducing energy consumption, high thermodynamic efficiency, and eliminating the use of hot steam

Inactive Publication Date: 2020-09-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem caused by this is that the temperature difference between the top and bottom of the tower is large, so that when the conventional heat pump rectification is applied to the dividing wall column, the compressor has a large compression ratio and cannot have high thermodynamic efficiency.

Method used

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  • Middle steam compression two-section type partition wall tower
  • Middle steam compression two-section type partition wall tower
  • Middle steam compression two-section type partition wall tower

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Table 1 is the raw material composition table of butane-butene-butyne three components

[0024]

[0025] The feed enters the dividing wall column from the left side of the pre-separation section 2, and the feed flow rate is 300 kmol / h. The position of the dividing plate is located in the split tower and its height is 60% of the height of the split tower in the next wall section. The partitions are set so that the ratio of the cross-sectional area of ​​the pre-separation section to the cross-sectional area of ​​the sideline production section is 1:1, and the operating pressures of the partition tower in the partition section and the partition tower in the common rectification section are 4 atm and 12 atm respectively. The compression ratio of the compressor is 3. The number of trays in the splitting column in the public rectification section is 60, the number of trays in the pre-separation section is 200, the number of trays in the sideline extraction section is 200,...

Embodiment 2

[0029] Table 3 is the raw material composition table of benzene-toluene-p-xylene three components

[0030]

[0031] The feed enters the dividing wall column from the left side of the pre-separation section 2, and the feed flow rate is 450 kmol / h. The position of the dividing plate is located in the split tower and its height is 50% of the height of the split tower in the next wall section. The partitions are set so that the ratio of the cross-sectional area of ​​the pre-separation section to the cross-sectional area of ​​the sideline production section is 1:1, and the operating pressures of the partition tower in the partition wall section and the partition tower in the common rectification section are 1 atm and 6 atm respectively. The compression ratio of the compressor is 6. There are 20 trays in the division column in the common rectification section, 35 trays in the pre-separation section, 35 trays in the sideline extraction section, and 20 trays in the common strippin...

Embodiment 3

[0035] Table 5 is the raw material composition table of n-pentane-isopentane-neopentane three components

[0036]

[0037]

[0038]The feed enters the dividing wall column from the left side of the pre-separation section 2, and the feed flow rate is 520 kmol / h. The position of the dividing plate is located in the split tower and its height is 30% of the height of the split tower in the next wall section. The partition is set so that the ratio of the cross-sectional area of ​​the pre-separation section to the cross-sectional area of ​​the sideline production section is 1:1, and the operating pressures of the partition tower of the partition wall section and the partition tower of the public rectification section are 1 atm and 4.3 atm respectively . The compression ratio of the compressor is 4.3. There are 27 trays in the division column in the common rectification section, 39 trays in the pre-separation section, 39 trays in the sideline production section, and 28 trays ...

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Abstract

The invention provides a middle steam compression two-section type partition wall tower comprising a common rectifying section dividing tower; the partition wall section dividing tower comprises a pre-separation section, a side line extraction section and a common stripping section, a partition plate of the partition wall section dividing tower is capped, steam of the pre-separation section and steam of the side line extraction section flow out and then converge together to enter a compressor, and the steam is pressurized and heated by the compressor to serve as a heat source of a tower kettleof the compressor and then enters the common rectifying section dividing tower. Liquid flowing out of the bottom of the common rectifying section dividing tower is decompressed by a throttling valveand then serves as steam at the top of a cold source cooling tower to be shunted into the pre-separation section and the common stripping section of the dividing wall tower section. The steam coming out of the top of the common rectifying section dividing tower is cooled by the condenser, then cooled by an auxiliary condenser again, and then flows back into the common rectifying section dividing tower. According to the invention, a traditional dividing wall tower and the middle steam compression technology are combined to form the middle steam compression two-section type partition wall tower,so that the thermodynamic efficiency is higher, the use of extra hot steam is omitted, and the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to rectification technology, in particular to a middle vapor compression two-stage dividing wall tower. Background technique [0002] Rectification is the preferred separation process in chemical industry, and its energy consumption is very huge. Improving its energy utilization efficiency has become a necessary trend in the development of rectification. Some energy-saving thermally coupled rectification towers have been developed at home and abroad, such as reactive rectification towers combining rectification and reaction; coupling processes combining rectification with other processes; complete thermally coupled rectification towers; internal thermally coupled rectification towers ; the tower next door, etc. [0003] When separating a three-component mixture, generally two ordinary rectification columns are required for sequential separation to obtain three different pure component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14B01D3/32C07C7/04C07C9/10C07C11/08C07C11/22C07C15/04C07C15/06C07C15/08C07C9/15C07C9/18
CPCB01D3/141B01D3/146B01D3/32C07C7/04C07C9/10C07C11/08C07C11/22C07C15/04C07C15/06C07C15/08C07C9/15C07C9/18
Inventor 李鑫钢从海峰何林李洪高鑫陈颢
Owner TIANJIN UNIV