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Method for low-energy consumption acetic acid hydrogenation production of ethanol

A low energy consumption, acetic acid technology, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of hydroxyl compounds, etc., can solve problems affecting the separation effect of the distillation tower, the pressure of the distillation tower, and the quality of ethanol products

Inactive Publication Date: 2015-12-30
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, the unreacted acetic acid is separated by rectification. This separation method will undoubtedly separate a large amount of ethanol and water from the top of the rectification tower, which requires a large amount of steam consumption. Generally speaking, this process needs to consume 1 of the entire process. / 2~1 / 3 steam consumption

Method used

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  • Method for low-energy consumption acetic acid hydrogenation production of ethanol
  • Method for low-energy consumption acetic acid hydrogenation production of ethanol
  • Method for low-energy consumption acetic acid hydrogenation production of ethanol

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Embodiment 1

[0045] In this embodiment, 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 accounted for 2wt% of the total weight of the catalyst; the balance is silicon oxide. The catalyst is prepared by co-precipitation.

[0046] The method for producing ethanol from acetic acid comprises the steps of:

[0047] (1) Hydrogenation: Preheat the acetic acid raw material and hydrogen, then make it pass through a reactor equipped with a hydrogenation catalyst, and hydrogenate acetic acid into crude ethanol product; the process condition of acetic acid hydrogenation is: the liquid phase volume of acetic acid The speed is 0.5h -1 , the molar ratio of hydrogen to acetic acid is 20:1, the reaction temperature is ...

Embodiment 2

[0053]In this embodiment, 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 accounted for 2wt% of the total weight of the catalyst; the balance is silicon oxide. The catalyst is prepared by co-precipitation.

[0054] The method for producing ethanol from acetic acid comprises the steps of:

[0055] (1) Hydrogenation: Preheat the acetic acid raw material and hydrogen, then make it pass through a reactor equipped with a hydrogenation catalyst, and hydrogenate acetic acid into crude ethanol product; the process condition of acetic acid hydrogenation is: the liquid phase volume of acetic acid The speed is 0.75h -1 , the molar ratio of hydrogen to acetic acid is 15:1, the reaction temperature is ...

Embodiment 3

[0061] In this embodiment, 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 accounted for 2wt% of the total weight of the catalyst; the balance is silicon oxide. The catalyst is prepared by co-precipitation.

[0062] The method for producing ethanol from acetic acid comprises the steps of:

[0063] (1) Hydrogenation: Preheat the acetic acid raw material and hydrogen, then make it pass through a reactor equipped with a hydrogenation catalyst, and hydrogenate acetic acid into crude ethanol product; the process condition of acetic acid hydrogenation is: the liquid phase volume of acetic acid The speed is 1.25h -1 , the molar ratio of hydrogen to acetic acid is 12:1, the reaction temperature is...

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Abstract

The invention discloses a method for producing ethanol by acetic acid hydrogenation and belongs to the technical field of alcohol substance production. The method overcomes defects of the existing ethanol purification process and improves ethanol product quality. Through deep and careful research, the inventor provides the method comprising that acetic acid undergoes a direct hydrogenation reaction to produce a crude ethanol product and the crude ethanol product is orderly subjected to ethyl acetate separation and acetic acid removal degreasing and dehydration processes so that an ethanol product is obtained. The method effectively separate ketones and acetaldehyde produced by acetic acid hydrogenation, is conducive to improvement of distillation column separating effects, effectively reduces impurities in a product and improves final ethanol product quality.

Description

technical field [0001] The invention relates to a method for producing ethanol, more specifically, the invention relates to a method for obtaining ethanol product through hydrogenation of acetic acid to ethanol and 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, Acetic acid, acetone, benzene, carbon tetrachloride, chloroform, ether, ethylene glycol, glycerin, nitromethane, pyridine and toluene are miscible in solvents such as disinfectants, beverages, thinners, environmental protection paints, pesticides, medicines, Rubbe...

Claims

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Application Information

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IPC IPC(8): C07C31/08C07C29/149C07C29/88C07C29/76
Inventor 田保亮戴伟黄龙唐国旗杨溢王国清彭晖
Owner CHINA PETROLEUM & CHEM CORP
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