High boiling point mixture stable temperature increasing device between extractive distillation towers and bottom reboilers

Abstract

The invention relates to a high boiling point mixture stable temperature increasing device between extractive distillation towers and bottom reboilers. The high boiling point mixture stable temperature increasing device is mainly used for solving problems of a conventional rectification tower-bottom reboiler communication mode that distillation operation is difficult, and temperature increasing fluctuation is large when the boiling point of ingredients in a mixture to be separated is higher than the temperature of heat sources, and energy consumption is high when the temperature of adopted of heat sources is higher. The high boiling point mixture stable temperature increasing device is characteristic in that: the tower top of a first extraction tower is connected with a corresponding tower top reflux pump, and the tower top of a second extraction tower is connected with a corresponding tower top reflux pump; a tower bottom pump A outlet of the first extraction tower is connected with the second extraction tower; a tower bottom pump B outlet of the second extraction tower is connected with a tower top feed inlet line of the first extraction tower; a fluid inlet of the tower top feed inlet line of the first extraction tower is arranged below a fluid outlet of the tower top of the first extraction tower; the lowest layer tower tray of the tower bottom of the first extraction tower is a liquid accumulation-type tower tray, and the lowest layer tower tray of the tower bottom of the second extraction tower is also a liquid accumulation-type tower tray; a plurality of steam raising columns are arranged above each of the liquid accumulation-type tower tray; the inlet of each reboiler is connected with the lowest point of the corresponding liquid accumulation-type tower tray, and the outlet of each reboiler is connected with the lower part of the corresponding liquid accumulation-type tower tray. The high boiling point mixture stable temperature increasing device is capable of realizing stable temperature increasing without increasing energy consumption, and comprehensive energy consumption is low.

Description

technical field [0001] The invention relates to a device for stably raising the temperature of a high boiling point mixture in the field of petrochemical industry, in particular to a device for stably raising the temperature of a high boiling point mixture between an extractive distillation tower and a bottom reboiler. Background technique [0002] In current petrochemical installations, extractive distillation is to add a third component (called extractant or solvent) to a mixture with a similar boiling point to change the relative volatility of the original component and separate it, usually requiring the third component The boiling point of the liquid is much higher than that of the components to be separated, and it does not form an azeotropic liquid with the components to be separated. It must be able to be recycled, and the heat is provided by the reboiler at the bottom of the column. After reaching a certain temperature in the rectification column, The process of sepa...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the difficulty in rectification operation when the boiling point of the component in the mixture to be separated is higher than the temperature of the heat source when the rectification tower and the reboiler at the bottom of the tower adopt the existing communication mode and the temperature rise fluctuates greatly. The high-temperature heat source affects safe production and high energy consumption, and a device for stabilizing the temperature of the high-boiling mixture between the extractive distillation column and the bottom reboiler is provided. The high-boiling point mixture stabilizes the heating device, which can stabilize the temperature rise without increasing energy consumption, and the comprehensive energy consumption is greatly reduced.

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