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Heat pump driven benzene tower fractionation device and method

A heat pump-driven, fractional distillation device technology, applied in the field of aromatic hydrocarbon separation, can solve the problems of affecting the colorimetric index of benzene and benzene products in acid washing, etc.

Active Publication Date: 2021-09-14
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The mixed aromatics in the extractive distillation part may contain traces of olefins and other impurities, which will significantly affect the acid wash colorimetric index of benzene and benzene products

Method used

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  • Heat pump driven benzene tower fractionation device and method
  • Heat pump driven benzene tower fractionation device and method

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Embodiment Construction

[0025] Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein.

[0026] refer to figure 1 , the benzene tower fractionation device driven by heat pump according to the present invention comprises: benzene tower 1; compression preheater 9, communicated with the top of the benzene tower through the first shut-off valve; compressor 10, communicated with compression preheater 9; heat pump reboiler 11, connected to the compressor 10 and the compression preheater 9, and connected to the bottom of the benzene tower; the pressure relief valve 12, connected to the compression preheater 9; the waste heat recovery heat exchanger 2 at the top of the tower, connected to the pressure relief valve 12 through...

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Abstract

The invention provides a heat pump-driven benzene tower fractionation device and method. The benzene tower fractionation device driven by the heat pump comprises: a benzene tower; a compression preheater connected to the top of the benzene tower through a first stop valve; a compressor connected to the compression preheater; a heat pump reboiler connected to the compressor and the compression preheater. The heat exchanger is connected to the bottom of the benzene tower; the pressure relief valve is connected to the compression preheater; the waste heat recovery heat exchanger on the top of the tower is connected to the pressure relief valve through the second cut-off valve, and connected to the top of the benzene tower through the third cut-off valve; The reflux tank is connected to the waste heat recovery heat exchanger at the top of the tower; the reflux pump at the top of the tower is connected to the reflux tank at the top of the tower and the top of the benzene tower; the bottom reboiler is connected to the bottom of the benzene tower. The present invention uses a benzene tower to separate benzene and C7-C9 aromatics. By increasing the operating pressure of the benzene tower and setting a heat pump to drive the benzene tower, the heat pump reboiler can share 60-80% of the total reboil load, and the benzene tower can be reasonably reduced. Reboiling energy consumption has obvious advantages in energy saving and consumption reduction.

Description

technical field [0001] The invention relates to the technical field of aromatics separation, and more specifically, to a heat pump-driven benzene tower fractionation device and method. Background technique [0002] Aromatics extraction is an important device for petrochemical enterprises to separate aromatics from reformed products. Liquid-liquid solvent extraction and solvent extraction distillation are widely used in industrial production. Among them, domestic petrochemical companies mostly use extractive distillation technology for aromatics recovery, and its working principle is to use highly selective solvents to change the relative volatility of feed components. In the mixture of aromatics and non-aromatics, due to the action of solvent, the relative volatility of non-aromatic components is increased. This promotion allows non-aromatic components to be evaporated to the top of the column in a traditional distillation column, while aromatics enriched at the bottom of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/00B01D3/14B01D3/32B01D3/42C07C7/04C07C15/04C07C15/02
CPCB01D3/007B01D3/14B01D3/322B01D3/42C07C7/005C07C7/04C07C15/04C07C15/02Y02P20/10Y02P20/50Y02P70/10
Inventor 魏志强袁忠勋张方方张宇鹏
Owner SINOPEC ENG
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