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Extractive distillation method

A technology of extractive distillation and extractant, applied in the field of extractive distillation, can solve the problems of high energy consumption and complicated process, and achieve the effect of simple process, good technical effect and energy saving

Active Publication Date: 2013-08-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that extractive distillation requires the joint process of two towers, an extractive distillation tower and a solvent recovery tower, and there are problems of complicated process and high energy consumption. A new method for extractive distillation is provided, which has the following steps: Simple and low energy consumption

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Experimental program
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Effect test

Embodiment 1

[0017] according to figure 1 The extractive distillation separation tower process shown, the tower is equipped with trays, the number of theoretical plates in the common stripping section of the extractive distillation separation tower is 8, the number of theoretical plates in the extractive distillation interval is 20 (the number of theoretical plates in the extraction distillation section is 15), and the separation rectification The number of theoretical plates in the section is 20, and the number of theoretical plates in the solvent recovery section is 4. The complex extractant is added from the extractant feed port with a flow rate of 10 ml / min, and the mixture of acetic acid and water (71.13% by weight of water, 28.87% by weight of acetic acid) is added from the raw material feed port with a flow rate of 10 ml / min. The extractive distillation separation column operates under normal pressure, the reflux ratio is 1, the temperature at the top of the tower is controlled at 9...

Embodiment 2

[0019] according to figure 1 The extractive distillation partition tower body shown, the theoretical plate number of the common stripping section of the separated rectification tower is 10, the theoretical plate number of the extractive distillation interval is 10 (the theoretical plate number of the extractive distillation section is 5), and the theoretical plate number of the separated rectification section is 10. The number of theoretical plates in the solvent recovery section is 3. The complex extractant is added from the extractant feed port with a flow rate of 10 ml / min, and the mixture of acetic acid and water (71.13% by weight of water, 28.87% by weight of acetic acid) is added from the raw material feed port with a flow rate of 10 ml / min. The extractive distillation separation column is operated under normal pressure, the reflux ratio is 1.5, the temperature at the top of the tower is controlled at 99.5-101.0°C, and the temperature at the bottom of the tower is contro...

Embodiment 3

[0021] according to figure 1 The extractive distillation partition tower body shown, the theoretical plate number of the common stripping section of the divided rectification tower is 30, the theoretical plate number of the extractive distillation interval is 40 (the theoretical plate number of the extractive distillation section is 20), and the theoretical plate number of the separated rectification section is 40, the number of theoretical plates in the solvent recovery section is 10. The complex extractant is added from the extractant feed port with a flow rate of 10 ml / min, and the mixture of acetic acid and water (71.13% by weight of water, 28.87% by weight of acetic acid) is added from the raw material feed port with a flow rate of 10 ml / min. The extractive distillation separation column operates under normal pressure, the reflux ratio is 0.5, the temperature at the top of the tower is controlled at 99.5-101.0°C, and the temperature at the bottom of the tower is controlle...

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Abstract

The invention relates to an extractive distillation method which is mainly used for solving the problem that the existing extractive distillation is achieved by virtue of an extractive distillation tower and solvent recycling tower combination process, the process is complex, and the energy consumption is high. In order to preferably solve the problems in the prior art, the technical scheme adopted by the invention is as follows: the method comprises the following steps: feeding raw materials and a solvent into the solvent feed port and raw material feed port of an extractive distillation separating tower; extracting light components from the top of the extractive distillation separating tower; extracting to-be-separated components from the side of a rectification section; and recycling the solvent from the bottom of the extractive distillation separating tower. The extractive distillation separating tower comprises an extractive distillation separating tower body, a top condenser, anupper rectification condenser and a bottom reboiler, wherein the extractive distillation separating tower body comprises an extractant feed port, the raw material feed port, a top feed port, a top discharge port, a bottom feed port, a bottom discharge port, a rectification section feed port, a rectification section discharge port, a separation plate, a solvent recycling section, an extractive distillation section, a rectification section and a common extraction section. The method is used in the extractive distillation industry.

Description

technical field [0001] The present invention relates to a method of extractive distillation. Background technique [0002] Extractive distillation is an important industrial process, which usually means adding a substance (solvent) with a lower volatility than the separated component (usually a homogeneous liquid mixture with a close boiling point) to the separated system to change the relative Volatility. Selecting a suitable solvent can increase the relative volatility between the separated components, so that the difficult-to-separate system can be converted into an easily separated system, and the separation cost can be reduced. Therefore, extractive distillation can The separation of the system and the azeotrope is a very potential operation process. With the rapid development of petrochemical industry in recent years, it is required to make full use of various materials, and the requirements for the purity of raw materials and products are also continuously increasing....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04B01D3/14
Inventor 钟禄平肖剑
Owner CHINA PETROLEUM & CHEM CORP