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Method for separating mixed alcohol-water by continuous extractive rectification

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: 2016-03-23
海安华达石油仪器有限公司
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Problems solved by technology

[0003] At present, the traditional methods for separating alcohol-water systems in China mainly include: (1) azeotropic distillation, whose main advantages are high degree of mechanization, large output, and good quality. 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 separating mixed alcohol-water by continuous extractive rectification
  • Method for separating mixed alcohol-water by continuous extractive rectification

Examples

Experimental program
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Effect test

example 1

[0017] Example 1: continuous extraction rectification separation alcohol-water mixture flow process reference figure 1 , extractive distillation column reference figure 2 , the inner diameter of the tower is 25mm, the tower body packing is 03$3mm stainless steel 0-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 sampling ports in the tower body, which are convenient for detecting the composition and content of the liquid phase. 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 packing is wetted. Properly adjust the heating voltage and keep the full reflux for 1...

example 2

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

example 3

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

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Abstract

The present invention relates to a method for separating mixed alcohol-water by continuous extractive rectification, and relates to a chemical separation method, i.e. a method for separating mixed alcohol-water by continuous extractive rectification with water mixtures such as ethanol, n-propanol and isobutanol. The method comprises the steps: combining extractive rectification with general rectification, and gradually separating the mixed alcohol and the water by using a combined sub-step separation method of multiple towers so as to recover and obtain a component with high purity; achieving separation of the mixed alcohol and the water in an extractive rectification tower B1 by using ethylene glycol as an extractant, wherein atmospheric rectification is used in the tower with a reflux ratio of 1:1 to 10:1, the mixed alcohol is obtained from the tower top, and the solvent and the water are obtain from the tower bottom; recovering most of the solvent in a solvent recovery tower B4 for recycling; and after allowing the mixed alcohol to pass through towers B2 and B3, effectively separating the mixed alcohol, respectively. The method provided by the invention combines extractive rectification with general rectification, breaks azeotropy between alcohol and water by using an extractant, and recovers components with relatively high purity step by step by using multi-tower continuous separation, so that the method has higher 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): C07C29/84C07C31/08C07C31/10C07C31/12
Inventor 不公告发明人
Owner 海安华达石油仪器有限公司
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