Novel energy-saving three-tower continuous extractive distillation technology and extractive distillation system thereof

A technology of extractive distillation and extractive distillation tower, which is applied in the field of new energy-saving three-tower continuous extractive distillation process and its extractive distillation system, which can solve the problems of relative volatility decrease, excessive energy, consumption, etc., and reduce consumption , small investment, simple process

Active Publication Date: 2014-12-24
SHANDONG ZHONGSHAN PHOTOELECTRIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When the extraction and rectification extractant used in extractive distillation, its gas-liquid equilibrium composition diagram and the gas-liquid equilibrium composition diagram without extractant show a special phenomenon, that is, taking ethanol-water azeotropic system as an example, for ethanol-water In the water binary system, ethylene glycol

Method used

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  • Novel energy-saving three-tower continuous extractive distillation technology and extractive distillation system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 The new energy-saving three-tower continuous extraction and rectification system for alcohol is shown. The energy-saving three-tower continuous extraction and distillation system is sequentially connected by an extractive distillation system, a solvent recovery system and an azeotropic distillation system.

[0031] The extractive distillation system comprises an extractive distillation tower 7, the upper end of the extractive distillation tower 7 is connected to the condenser 2, the condenser 2 is connected back to the extractive distillation tower 7 through a pipeline, and the lower end of the extractive distillation tower 7 is connected to a reboiler through a pipeline 8. The reboiler 8 is connected back to the extractive distillation tower 7 through a pipeline; the raw material azeotrope inlet pipe 6 is arranged on the lower side of the extractive distillation tower 7, and the extraction agent inlet pipe 1 is arranged on the upper side;

[0032] The ...

Embodiment 2

[0042] The new energy-saving three-tower continuous extraction rectification alcohol system used in this example is the same as that in Example 1.

[0043] The extractive distillation column 7 has 25 plates, and the azeotrope system 6 (ethanol-water azeotrope system with 70% ethanol mass percentage) that has been preheated to 78°C enters the tower body from the 22nd plate, and the feed flow The rate is 100mol / h, and the extraction agent 1 (ethylene glycol) that has been preheated to 20°C enters the tower body from the seventh plate, the feed flow rate is 100mol / h, and 1000mL of material enters the bottom of the tower, and after 1 hour of total reflux Operation, the set reflux ratio is 0.1, the top pressure is maintained at 1 atm, the extraction flow rate at the top of the tower is 70mol / h, the extraction of high purity 3 (ethanol concentration is 99.98%), and the extraction flow rate at the bottom of the tower is 25mol / h , the produced liquid enters the extraction agent recove...

Embodiment 3

[0045] The new energy-saving three-tower continuous extraction rectification alcohol system used in this example is the same as that in Example 1.

[0046] The extractive distillation tower 7 has 25 plates, and the azeotrope system 6 (ethanol-water azeotrope system with 60% ethanol mass percentage) that has been preheated to 78°C enters the tower body from the 22nd plate, and the feed flow The rate is 100mol / h, and the extraction agent 1 (ethylene glycol) that has been preheated to 20°C enters the tower body from the seventh plate, the feed flow rate is 100mol / h, and 1000mL of material enters the bottom of the tower, and after 1 hour of total reflux Operation, the set reflux ratio is 0.1, the top pressure is maintained at 1 atm, the extraction flow rate at the top of the tower is 70mol / h, the extraction of high purity 3 (ethanol concentration is 99.00%), and the extraction flow rate at the bottom of the tower is 25mol / h , the produced liquid enters the extraction agent recover...

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Abstract

The invention relates to a novel energy-saving three-tower continuous extractive distillation technology and an extractive distillation system thereof. The novel energy-saving three-tower continuous extractive distillation technology comprises the steps as follows: a preheated azeotrope system enters a tower body, a preheated extracting agent enters an extractive distillation tower body, raw materials enter the tower body from the tower bottom, infinite reflux operation is performed, a high-purity and light-component product is produced from the tower top, a tower bottom produced liquid enters an extracting agent recovery tower from a sixth tower plate of the extracting agent recovery tower, infinite reflux operation is performed, a high-purity extracting agent is produced from the tower bottom and mixed with a fresh extracting agent and enters the extractive distillation tower, a tower top produced liquid enters an azeotropic distillation tower, infinite reflux operation is performed for one hour, a heavy-component product is produced from the tower bottom, the tower top produced liquid circularly returns to an azeotrope feeding pipe of the extractive distillation tower, is mixed with the raw materials and enters the extractive distillation tower, and production is performed continuously. The novel energy-saving three-tower continuous extractive distillation technology and the extractive distillation system thereof have the advantages of simple technological process, easiness in operation, little investment, high efficiency, short construction period, consumption reduction, remarkable energy saving and obvious increase of azeotrope light-component productivity.

Description

technical field [0001] The invention relates to a novel energy-saving three-tower continuous extraction and rectification process and an extraction and rectification system thereof, belonging to the field of chemical technology. Background technique [0002] The structural formula of ethanol is CH 3 CH 2 OH, commonly known as alcohol, is a flammable and volatile colorless transparent liquid at normal temperature and pressure. Ethanol is one of the industrial raw materials with a wide range of uses and a large amount. It occupies an important position in various sectors of the national economy and has a close relationship with people's lives. Ethanol is widely used in food, chemical, pharmaceutical, dye, national defense and other industries, and it is also a very important clean energy. And the ethanol-water system is the system with the lowest azeotropic point. [0003] At present, the separation methods of ethanol-water azeotropic mixture mainly include extractive dist...

Claims

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Application Information

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IPC IPC(8): C07C31/08C07C29/84B01D3/40
CPCB01D3/40C07C29/84C07C41/58C07C253/34C07C31/08C07C31/04C07C255/03C07C43/30Y02P20/50
Inventor 李哲师恩山张好翠刘莱琛
Owner SHANDONG ZHONGSHAN PHOTOELECTRIC MATERIAL CO LTD
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