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A process for preparing and refining ethanol by direct hydrogenation of acetic acid

A technology for the preparation of hydrogen and ethanol, which is applied in the field of direct hydrogenation of acetic acid to prepare refined ethanol to achieve the effects of prolonging service life, reducing volume and improving reaction efficiency

Active Publication Date: 2021-05-28
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to improve the selectivity of the direct hydrogenation reaction of acetic acid and the stability of the catalyst in the prior art, thereby proposing a method that can meet the needs of hydrogenation to produce ethanol, and greatly reduce equipment investment and energy consumption. Process for preparing and refining ethanol by direct hydrogenation of reduced acetic acid

Method used

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  • A process for preparing and refining ethanol by direct hydrogenation of acetic acid
  • A process for preparing and refining ethanol by direct hydrogenation of acetic acid
  • A process for preparing and refining ethanol by direct hydrogenation of acetic acid

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Embodiment 1

[0047] Such as figure 1 Shown, the technique that the direct hydrogenation of acetic acid of the present embodiment prepares ethanol is,

[0048] (1) Mixing the acetic acid raw material and hydrogen with a molar ratio of 1:20 in a mixer, the mixed gas is transported into the vaporizer and gasified to obtain the raw material mixed gas, and the raw mixed material mixture is transported to the heavy separator ( Such as figure 2 shown) to remove dust and liquid droplets in the raw material mixture.

[0049] (2) Under the action of a hydrogenation catalyst, the raw material mixture that removes dust and liquid droplets is passed into a hydrogenation reactor (such as image 3 and 4 Shown) to carry out the reaction, the control reaction temperature is 280 ℃, and the reaction pressure is 2.0MPa;

[0050] (3) cooling the reactant of the step (2), and separating crude ethanol and a hydrogen-containing gas phase, in order to improve the utilization rate of heat and reduce energy con...

Embodiment 2

[0064] The process of preparing ethanol by the direct hydrogenation of acetic acid of the present embodiment is,

[0065] (1) Mixing the acetic acid raw material and hydrogen with a molar ratio of 1:30 in the mixer, the mixed gas is transported into the vaporizer and gasified to obtain the raw material mixed gas, and the raw mixed material mixture is transported to the heavy separator ( Such as figure 2 shown) to remove dust and liquid droplets in the raw material mixture.

[0066] (2) Under the action of a hydrogenation catalyst, the raw material mixture that removes dust and liquid droplets is passed into a hydrogenation reactor (such as image 3 and 4 Shown) to carry out the reaction, the control reaction temperature is 210 ℃, and the reaction pressure is 3.0MPa;

[0067] (3) cooling the reactant of the step (2), and separating crude ethanol and a hydrogen-containing gas phase, in order to improve the utilization rate of heat and reduce energy consumption, the reactant of ...

Embodiment 3

[0083] Such as figure 1 Shown, the technique that the direct hydrogenation of acetic acid of the present embodiment prepares ethanol is,

[0084] (1) The acetic acid raw material and the hydrogen gas with a molar ratio of 1:40 are mixed in a mixer, and the mixed gas is transported into a vaporizer for gasification to obtain a raw material mixed gas, and the raw mixed material mixture is transported to a heavy separator ( Such as figure 2 shown) to remove dust and liquid droplets in the raw material mixture.

[0085] (2) Under the action of a hydrogenation catalyst, the raw material mixture that removes dust and liquid droplets is passed into a hydrogenation reactor (such as image 3 and 4 Shown) to carry out the reaction, the control reaction temperature is 290 ℃, and the reaction pressure is 4.0MPa;

[0086] (3) cooling the reactant of the step (2), and separating crude ethanol and a hydrogen-containing gas phase, in order to improve the utilization rate of heat and redu...

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Abstract

The invention discloses a process for directly hydrogenating acetic acid to prepare and refine ethanol, comprising: (1) mixing acetic acid raw materials with hydrogen and gasifying to obtain raw material mixed gas, and removing dust and liquid droplets in the raw material mixed gas; (2) Under the action of a hydrogenation catalyst, the raw material mixture gas that removes dust and liquid droplets is reacted, and the reaction temperature is controlled to be 210-290 ° C, and the reaction pressure is 2.0-5.0; (3) cooling the reactant of the step (2) , and separated to obtain crude ethanol, (4) the crude ethanol is delightened first, then neutralized, then purified and dehydrated to obtain refined ethanol. The hydrogenation catalyst of the present invention comprises calcium carbonate and / or barium carbonate. The selectivity of ethanol is improved, the amount of by-products acetone, isopropanol and ethyl acetate is reduced, and the step of first removing light and then neutralizing is adopted, so that the acetaldehyde content in the obtained refined ethanol is 0.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a process for preparing refined ethanol through direct hydrogenation of acetic acid. Background technique [0002] Ethanol is an important chemical, pharmaceutical, energy and food raw material. Ethanol is a colorless, volatile, flammable liquid at room temperature. Ethanol can be used to produce raw materials such as acetaldehyde, ether, ethyl acetate, ethylamine, ethyl acrylate, ethylene oxide, medicine, pesticides, etc. It can be mixed into gasoline and diesel oil, and can be mixed with water, acetic acid, acetone, benzene, Miscible with carbon tetrachloride, chloroform, ether, ethylene glycol, glycerin, nitromethane, pyridine and toluene, etc., also used as disinfectant, beverage, thinner, environmental protection paint, pesticide, medicine, rubber, plastic, artificial fiber , Detergents and other major aspects. [0003] The industrial production met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/156C07C29/152C07C31/08B01J23/28B01J23/02B01J23/72B01J23/745B01J8/04
CPCB01J8/0446B01J8/0496B01J21/08B01J23/002B01J2208/0015B01J2523/00C07C29/152C07C29/156C07C31/08B01J2523/17B01J2523/23B01J2523/68B01J2523/842
Inventor 蒲延芳赵文涛黄龙
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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