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Method for continuously extracting, rectifying and separating mixed alcohols from water

A technology for extractive distillation and mixed alcohols, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc. It can solve the problems of immature membrane separation technology, large investment in azeotropic distillation equipment, and physical hazards of operators. To achieve the effect of improving equipment efficiency, convenient application, large economic and environmental benefits

Inactive Publication Date: 2013-07-10
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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AI Technical Summary

Problems solved by technology

[0003] At present, the traditional methods for the separation of alcohol and water systems in China mainly include: (1) Azeotropic distillation, its main advantages are high degree of mechanization, large output, and good quality. The disadvantage is that the azeotropic distillation equipment requires large investment. Boiling agent gasification is bound to increase energy consumption, and the use of benzene, a commonly used constant boiling agent, is harmful to the health of operators, so it will gradually be replaced by green and environmentally friendly new processes
(2) Membrane distillation, but because the production cost of membrane materials is relatively high, membrane separation technology is not yet fully mature, so it has not been widely used

Method used

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  • Method for continuously extracting, rectifying and separating mixed alcohols from water
  • Method for continuously extracting, rectifying and separating mixed alcohols from water

Examples

Experimental program
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Effect test

example 1

[0017] Example 1: Process reference for continuous extraction and rectification separation of alcohol-water mixture figure 1 , extractive distillation column reference figure 2 , the inner diameter of the tower is 25mm, and the packing of the tower body is Φ3 3mm stainless steel θ ring packing, the total height of the packing part is about 1.6m, and the number of theoretical plates is about 80. There are 3 and 2 tower body sampling ports in the rectification section and stripping section of the extractive distillation tower, which are convenient for liquid detection. Phase composition content. At the beginning of the experiment, first open the cooling water of the condenser at the top and bottom of the tower, close the valves at the top and bottom of the tower, and add 300ml of ethylene glycol and alcohol-containing waste liquid mixture with a solvent ratio of 4:1 into the tower kettle; Turn on the heating power of the tower kettle and heat to boiling until the tower body ...

example 2

[0018] Example 2: Basically the same as Example 1, set the feed flow rate of ethylene glycol to 0.644ml / min, the feed flow rate of alcohol-containing waste liquid to 0.279ml / min, and set the reflux ratio to 1~3.

example 3

[0019] Example 3: basically the same as Example 1, set the reflux ratio to 1.35, set the ethylene glycol feed flow rate to 0.4~0.8ml / min, and set the alcohol-containing waste liquid feed flow rate to 0.2ml / min.

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Abstract

The invention discloses a method for continuously extracting, rectifying and separating mixed alcohols from water, relates to a chemical separating method, and in particular to a method for continuously extracting, rectifying and separating mixed alcohols such as aqueous mixtures of ethanol, n-propyl alcohol, isobutyl alcohol and the like. According to the method, extractive distillation and common rectifying are combined together, and a multi-column combined step-by-step separating method is adopted to separate mixed alcohols from water step by step and recycle components with high purity. The method comprises steps of: with ethylene glycol as an extraction agent, separating the mixed alcohols from water in an extractive rectifying column B1, wherein the column B1 adopts normal pressure rectification, the reflux ratio is 1:1-10:1, the mixed alcohols can be get from the column top, and a mixture of a solvent and water can be get from the column bottom; recovering most of the solvent from a solvent recovering column B4 and recycling the solvent; and effectively separating the mixed alcohols through columns B2 and B3. According to the method, extractive distillation and common rectifying are combined together, the extraction agent is used to avoid the azeotrope of alcohols and water, and continuous separation of multiple columns are adopted to recover the components with high purity step by step, so that the method has high economic and environmental benefits.

Description

technical field [0001] The invention relates to a chemical separation method, in particular to a continuous extraction and rectification method for separating mixed alcohol-water, which can be used to recover valuable alcohols from alcohol-water mixtures. Background technique [0002] With the depletion of oil resources, the future energy structure will shift to coal and natural gas, and the production of low-carbon mixed alcohols from natural gas or coal gasification to produce syngas as an alternative fuel has attracted more and more attention. However, in the production of syngas In the low-carbon alcohol process, a large amount of alcohol-containing waste liquid is inevitably produced. If the various waste liquids generated in industrial production are directly discharged, it will cause serious waste of resources and environmental pollution. Recycling the alcohol-containing waste liquid can obtain Low-carbon mixed alcohols or alcohols with higher purity have huge environ...

Claims

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Application Information

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IPC IPC(8): C07C29/80C07C29/84C07C31/08C07C31/10C07C31/12C07C31/20
Inventor 张志刚李文秀黄动昊陈立峰邢媛
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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