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Method for separating methyl alcohol in low-carbon mixed alcohols based on steam compression

A low-carbon mixed alcohol and separation method technology, applied in the separation/purification of hydroxyl compounds, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of low taste latent heat, system energy consumption reduction, and high energy consumption of separation technology. Achieve the effects of low equipment investment, good quality, and simple control of process conditions

Inactive Publication Date: 2017-05-10
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned defects of high energy consumption of low-carbon mixed alcohol methanol separation technology existing in the prior art, and provide a method for separating methanol in low-carbon mixed alcohol based on vapor compression. The method utilizes vapor compression technology, The mature device in the existing technology realizes the recovery and utilization of low-grade latent heat, which can further reduce the energy consumption of the system on the premise of satisfying the treatment effect

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  • Method for separating methyl alcohol in low-carbon mixed alcohols based on steam compression
  • Method for separating methyl alcohol in low-carbon mixed alcohols based on steam compression

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Embodiment 1

[0018] In this embodiment, low-carbon mixed alcohols are selected, the processing capacity is 10 tons / hour, and the methanol content is 15.75% (mass fraction). Processing methods such as figure 1 As shown, the low-carbon mixed alcohol first passes through the dehydration tower to remove part of the water, and then pumps it into the methanol rectification tower through heat exchange. The operating pressure of the methanol rectification tower is controlled to be 0.04MPa. ℃. Methanol vapor is evaporated from the top of the tower, and part of it enters the steam compressor through the splitter. The methanol vapor is pressurized to 0.12MPa by the steam compressor, and after the temperature rises to 130.9°C, it enters the reboiler at the bottom of the methanol rectification tower and is used as the heat source of the methanol rectification tower to exchange heat with part of the liquid in the tower still , the temperature of the methanol vapor is reduced to 69.1°C, mixed with anot...

Embodiment 2

[0022] In this embodiment, low-carbon mixed alcohols are selected, the processing capacity is 10 tons / hour, and the methanol content is 15.75% (mass fraction). The low-carbon mixed alcohol first passes through the dehydration tower to remove part of the water, and then pumps it into the methanol rectification tower through heat exchange. The operating pressure of the methanol rectification tower is controlled to be 0.03 MPa. The temperature at the top of the tower is 36.6°C and the temperature at the bottom of the tower is 56.9°C . Methanol vapor is evaporated from the top of the tower, and part of it enters the steam compressor through the splitter. The methanol vapor is pressurized to 0.09MPa by the steam compressor, and after the temperature rises to 101.4°C, it enters the reboiler at the bottom of the methanol rectification tower, and is used as the heat source of the methanol rectification tower to exchange heat with part of the liquid in the tower still , the temperatur...

Embodiment 3

[0026] In this embodiment, low-carbon mixed alcohols are selected, the processing capacity is 15 tons / hour, and the methanol content is 15.20% (mass fraction). The low-carbon mixed alcohol first removes part of the water through the dehydration tower, and then pumps it into the methanol rectification tower through heat exchange. The operating pressure of the methanol rectification tower is controlled at 0.12MPa. The tower top temperature is 90.7°C, and the tower bottom temperature is 83.1°C. . Methanol vapor is evaporated from the top of the tower, and part of it enters the steam compressor through the splitter. The methanol vapor is pressurized to 0.33MPa by the steam compressor, and after the temperature rises to 133.9°C, it enters the reboiler at the bottom of the methanol rectification tower, which is used as the heat source of the methanol rectification tower, and exchanges heat with part of the liquid in the tower kettle , the temperature of the methanol vapor is reduce...

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Abstract

The invention relates to the technical field of low-carbon mixed alcohol separation, in particular to a method for separating methyl alcohol in low-carbon mixed alcohols based on steam compression. The method comprises the steps that the low-carbon mixed alcohols are pumped into a rectifying tower, methyl alcohol steam is extracted from the top of the tower and is divided into two ways, one way of methyl alcohol steam is distributed to a compressor, is pressurized and heated and then enters a re-boiling device at the bottom of the rectifying tower to be used as a heat source of the rectifying tower, the alcohol steam performs heat exchange with part of kettle liquid and then is mixed with the other way of alcohol steam, the mixed steam enter a tower top condenser, and a methyl alcohol product is extracted after condensation. The method fully utilizes latent heat of the alcohol steam extracted from the tower top and does not need fresh steam supplementing, and the energy consumption is remarkably reduced. The purity of the methyl alcohol product is 95% or above, and the quality is good. The device investment is saved, used devices and technologies are mature, process conditions are simple to control, and the method can be widely applied to various methanol rectification treatment occasions.

Description

technical field [0001] The invention relates to the technical field of separation of low-carbon mixed alcohols, in particular to a method for separating methanol from low-carbon mixed alcohols based on vapor compression. Background technique [0002] Low-carbon mixed alcohol refers to a mixture of C1-C6 alcohols, which is mainly formed by synthesizing and dehydrating synthesis gas under the action of a catalyst. Low-carbon mixed alcohol has a high octane number, has good doping properties with gasoline, and can be used as engine fuel or gasoline additive. The methanol content in the crude product of the low-carbon mixed alcohol accounts for more than 15%. Separating the methanol can further increase the octane number of the mixed alcohol. The octane number is an important indicator of the antiknock performance of the carburetor engine fuel. The higher the octane number of gasoline, the better the antiknock performance, and the engine can use a higher compression ratio to im...

Claims

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Application Information

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IPC IPC(8): C07C29/74C07C29/80C07C31/04
CPCC07C29/74C07C29/80C07C31/04
Inventor 盖恒军冯艺荣林凯强郭凯刘宗
Owner QINGDAO UNIV OF SCI & TECH