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Method for production of ethanol by direct hydrogenation of acetic acid

A technology of acetic acid and ethanol, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of hydroxyl compounds, etc., can solve problems affecting the separation effect of distillation towers, affecting the quality of ethanol products, and affecting the pressure of distillation towers, etc., to achieve Reduced energy consumption, improved quality, and reduced impurities

Inactive Publication Date: 2014-12-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of light components such as acetaldehyde will affect the pressure of each distillation tower, and pressure fluctuations will affect the separation effect of the distillation tower, and acetaldehyde is easy to polymerize to form heavy components, thus affecting the quality of ethanol products
Moreover, in the existing relevant patent applications, the degreasing tower generally adopts the extraction and rectification method, which has relatively high energy consumption and complicated process

Method used

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  • Method for production of ethanol by direct hydrogenation of acetic acid
  • Method for production of ethanol by direct hydrogenation of acetic acid
  • Method for production of ethanol by direct hydrogenation of acetic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0048] In this example, the catalyst for acetic acid hydrogenation is the acetic acid hydrogenation catalyst produced by Beijing Research Institute of Chemical Industry, the brand is BC-E-20, and the catalyst contains: (1) cobalt, wherein the cobalt metal content accounts for 30wt% of the total weight of the catalyst ; (2) molybdenum and chromium, respectively account for 2wt% of the total weight of the catalyst; the balance is silicon oxide. The catalyst is prepared by co-precipitation.

[0049] The method for producing ethanol by acetic acid comprises the following steps:

[0050] (1) Hydrogenation: Preheat the acetic acid raw material and hydrogen, and then make it pass through a reactor equipped with a hydrogenation catalyst to hydrogenate acetic acid into crude ethanol product; the process conditions of acetic acid hydrogenation are: the liquid phase volume of acetic acid is empty The speed is 0.5h -1 , the molar ratio of hydrogen to acetic acid is 20:1, the reaction te...

Embodiment 2

[0058] In this example, the catalyst for acetic acid hydrogenation is the acetic acid hydrogenation catalyst produced by Beijing Research Institute of Chemical Industry, the brand is BC-E-20, and the catalyst contains: (1) cobalt, wherein the cobalt metal content accounts for 30wt% of the total weight of the catalyst ; (2) molybdenum and chromium, respectively account for 2wt% of the total weight of the catalyst; the balance is silicon oxide. The catalyst is prepared by co-precipitation.

[0059] The method for producing ethanol by acetic acid comprises the following steps:

[0060] (1) Hydrogenation: Preheat the acetic acid raw material and hydrogen, and then make it pass through a reactor equipped with a hydrogenation catalyst to hydrogenate acetic acid into crude ethanol product; the process conditions of acetic acid hydrogenation are: the liquid phase volume of acetic acid is empty The speed is 0.75h -1 , the molar ratio of hydrogen to acetic acid is 15:1, the reaction t...

Embodiment 3

[0068] In this example, the catalyst for acetic acid hydrogenation is the acetic acid hydrogenation catalyst produced by Beijing Research Institute of Chemical Industry, the brand is BC-E-20, and the catalyst contains: (1) cobalt, wherein the cobalt metal content accounts for 30wt% of the total weight of the catalyst ; (2) molybdenum and chromium, respectively account for 2wt% of the total weight of the catalyst; the balance is silicon oxide. The catalyst is prepared by co-precipitation.

[0069] The method for producing ethanol by acetic acid comprises the following steps:

[0070] (1) Hydrogenation: Preheat the acetic acid raw material and hydrogen, and then make it pass through a reactor equipped with a hydrogenation catalyst to hydrogenate acetic acid into crude ethanol product; the process conditions of acetic acid hydrogenation are: the liquid phase volume of acetic acid is empty The speed is 1.25h -1 , the molar ratio of hydrogen to acetic acid is 12:1, the reaction t...

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Abstract

Belonging to the field of production technologies for alcohol substances, the invention discloses a method for production of ethanol by direct hydrogenation of acetic acid. In order to solve the defects of an ethanol purification process in the prior art, improve the ethanol product quality and reduce energy consumption, the inventor specifically puts forward a technological process through in-depth and meticulous research. The process includes: subjecting acetic acid to direct hydrogenation to obtain a crude ethanol product, then removing ketone components, separating unreacted acetic acid and ethyl acetate, and removing water in order, thus obtaining the ethanol product. The method provided by the invention can effectively separate ketone, acetaldehyde and other substances generated in the hydrogenation process, thus facilitating improving the separation effect of a distillation tower and effectively reducing impurities in the product. Therefore, the quality of the final ethanol product can be improved.

Description

technical field [0001] The invention relates to a method for producing ethanol, more specifically, the invention relates to a method for directly hydrogenating acetic acid into ethanol and obtaining ethanol product through a refining process. Background technique [0002] Ethanol is the earliest and most widely used fatty alcohol, and it is also the main component of wine. Ethanol is a colorless, volatile, flammable liquid at room temperature. Ethanol has a wide range of uses. For example, it can be used to produce chemical raw materials such as acetaldehyde, ether, ethyl acetate, ethylamine, ethyl acrylate, ethylene oxide, medicine, and pesticides. It can be mixed into gasoline and diesel oil, and can be mixed with water, Miscible with solvents such as acetic acid, acetone, benzene, carbon tetrachloride, chloroform, ether, ethylene glycol, glycerin, nitromethane, pyridine, and toluene, and can also be used as disinfectants, beverages, thinners, environmental protection pai...

Claims

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Application Information

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IPC IPC(8): C07C31/08C07C29/149C07C29/74C07C29/80
CPCC07C29/149B01J23/8878C07C29/76C07C29/84
Inventor 田保亮戴伟唐国旗黄龙杨溢
Owner CHINA PETROLEUM & CHEM CORP
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