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Method and device for reducing separation energy consumption of ethanol crude product prepared by acetic acid hydrogenation

A technology for crude ethanol products and products, which is applied in the separation/purification of carboxylic acid esters, the separation/purification of hydroxyl compounds, and organic chemistry, etc., can solve the problems of complex composition, high energy consumption, and high separation energy consumption of ethanol crude products. , to achieve the effect of reducing heat supply, reducing separation energy consumption, and reducing energy consumption

Active Publication Date: 2020-12-29
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although step 3) has obtained dehydrated alcohol product, the energy consumption of this method is bigger
[0008] Therefore, for the process of hydrogenation of acetic acid to ethanol, the composition of the crude ethanol obtained is complex, and there is a problem of high energy consumption during separation.

Method used

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  • Method and device for reducing separation energy consumption of ethanol crude product prepared by acetic acid hydrogenation
  • Method and device for reducing separation energy consumption of ethanol crude product prepared by acetic acid hydrogenation
  • Method and device for reducing separation energy consumption of ethanol crude product prepared by acetic acid hydrogenation

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specific Embodiment approach

[0054] According to a specific embodiment of the present invention, the method may include the following steps:

[0055] (A) Separating the crude ethanol produced by hydrogenation of acetic acid into gas-liquid to obtain crude ethanol in the liquid phase, preheating the crude ethanol to 30-50°C, preferably 40-45°C, and passing it into the acetic acid separation tower 1. The top of the tower obtains the first overhead product containing ethanol, ethyl acetate, water and by-products, and the bottom of the tower obtains a product containing acetic acid and water;

[0056] (B) The first overhead product is passed into the crude fractionation tower 2, the second overhead product containing ethyl acetate, water, ethanol and by-products is obtained at the top of the tower, and the second tower bottom containing ethyl acetate, water, ethanol and by-products is obtained at the bottom of the tower Product; The second tower bottom product is passed into ethanol rectification tower 5;

...

Embodiment 1

[0082] (A) if figure 1 As shown, the crude ethanol produced by hydrogenation of acetic acid shown in Table 1 and Table 2 is subjected to gas-liquid separation to obtain crude ethanol in the liquid phase, and the crude ethanol is preheated to 42°C and passed into the acetic acid separation tower 1 , the top of the tower obtains the first overhead product containing the ethanol of 63% by weight, the ethyl acetate of 7% by weight, the water of 28% by weight and the by-product of 2% by weight, and the bottom of the tower obtains the acetic acid containing 92% by weight, 6.6% by weight The product of the water of % by weight and the by-product of 1.4% by weight; The first overhead product is passed to crude fractionation tower 2, and tower top obtains and contains 52.8% by weight of ethyl acetate, 4.5% by weight of water, 36.6% by weight of ethanol and 6.1% by weight The second tower top product of weight % by-product, the second tower bottom product that contains the by-product of...

Embodiment 2

[0092] (A) if figure 1 As shown, the crude ethanol produced by hydrogenation of acetic acid shown in Table 1 and Table 2 is subjected to gas-liquid separation to obtain crude ethanol in the liquid phase, and the crude ethanol is preheated to 40°C and passed into the acetic acid separation tower 1, tower The top obtains the first overhead product containing the ethanol of 63.4% by weight, the ethyl acetate of 7% by weight, the water of 28.4% by weight and the by-product of 1.2% by weight, and the bottom of the tower obtains the acetic acid containing 92.6% by weight, 5.8% by weight of The product of water and 1.6% by weight of by-products; the first overhead product is passed to the crude fractionation column 2, and the top of the tower is obtained to contain 52.7% by weight of ethyl acetate, 4.4% by weight of water, 36.8% by weight of ethanol and 6.1% by weight of The second tower top product of by product, the second tower bottom product that contains the by-product of weight...

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Abstract

The invention relates to the field of product refining, and discloses a method and device for reducing separation energy consumption of an ethanol crude product prepared by acetic acid hydrogenation.The method comprises the following steps: (A) preheating an ethanol crude product prepared by acetic acid hydrogenation, introducing the preheated ethanol crude product into an acetic acid separationtower to obtain a first tower top product at the tower top, introducing the first tower top product into a coarse separation tower to obtain a second tower top product at the tower top and a second tower bottom product at the tower bottom, and introducing the second tower bottom product into an ethanol rectification tower; (B) introducing the second tower top product into an ethylene glycol extraction tower for first extraction to obtain a third tower top product at the tower top and a third tower bottom product at the tower bottom; (C) introducing the third tower bottom product into an extractant recovery tower to obtain a fourth tower top product at the tower top, introducing the fourth tower top product into an ethanol rectification tower, and obtaining an ethanol-containing product atthe tower top of the ethanol rectification tower; and (D) introducing water and the third tower top product into a liquid-liquid separator for second extraction to obtain a water phase and an oil phase, and introducing the oil phase into an ethyl acetate rectifying tower. The method can reduce the separation energy consumption of the ethanol crude product prepared by acetic acid hydrogenation.

Description

technical field [0001] The invention relates to the field of product refining of organic chemistry, in particular to a method and a device for reducing energy consumption for separating crude ethanol produced by hydrogenation of acetic acid. Background technique [0002] Ethanol is an important commodity chemical that is added to gasoline and used as a vehicle fuel. Ethanol can be produced by fermentation, but the cost and energy consumption of ethanol produced by fermentation are high. Therefore, a shift has been made to the coal-to-ethanol process. There are three main routes for coal-to-ethanol: (1) Syngas to ethanol in one step. Coal gasification produces syngas, syngas is produced into low-carbon alcohols in one step, and ethanol is separated from mixed low-carbon alcohols. (2) Ethanol is produced by hydrogenation of acetate. Coal gasification produces synthesis gas, synthesis gas produces methanol, methanol carbonylation produces acetic acid, acetic acid is esterif...

Claims

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Application Information

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IPC IPC(8): C07C29/76C07C31/08C07C67/48C07C69/14
CPCC07C29/76C07C67/48C07C31/08C07C69/14
Inventor 姚金松孟祥堃陈强胡云剑赵用明
Owner CHNA ENERGY INVESTMENT CORP LTD