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Method used for preparing ethanol via direct hydrogenation of acetic acid

A direct hydrogen preparation technology, applied in the preparation of hydroxyl compounds, organic compounds, physical/chemical process catalysts, etc., to achieve the effects of reducing volume, prolonging service life and improving selectivity

Active Publication Date: 2017-07-28
WUHAN JINZHONG PETROCHEM ENG
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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 ethanol by direct hydrogenation of reduced acetic acid

Method used

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  • Method used for preparing ethanol via direct hydrogenation of acetic acid
  • Method used for preparing ethanol via direct hydrogenation of acetic acid
  • Method used for preparing ethanol via direct hydrogenation of acetic acid

Examples

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Embodiment 1

[0043] Such as figure 1 Shown, the technique that the direct hydrogenation of acetic acid of the present embodiment prepares ethanol is,

[0044] (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.

[0045] (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;

[0046] (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

[0056] The process of preparing ethanol by the direct hydrogenation of acetic acid of the present embodiment is,

[0057] (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.

[0058] (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;

[0059] (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 o...

Embodiment 3

[0070] Such as figure 1 Shown, the technique that the direct hydrogenation of acetic acid of the present embodiment prepares ethanol is,

[0071] (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.

[0072] (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;

[0073](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 reduc...

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Abstract

The invention discloses a method used for preparing ethanol via direct hydrogenation of acetic acid. The method comprises following steps: 1, acetic acid raw material is mixed with hydrogen, and is subjected to gasification so as to obtain a raw material mixed gas, and dust and liquid drops in the raw material mixed gas are removed; 2, under the action of a hydrogenation catalyst, the raw material mixed gas obtained via dust and liquid drop removing is reacted at 210 to 290 DEG C under reaction pressure of 2.0 to 5.0; 3, a reaction product obtained in step 2 is cooled, and crude ethanol and a hydrogen-containing gas phase are obtained via separation. The hydrogenation catalyst comprises calcium carbonate and / or barium carbonate; ethanol selectivity is increased; and the amount of by-products acetone, isopropanol, and acetic ester is reduced.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a process for preparing 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 methods of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/149C07C31/08B01J27/232
CPCC07C29/149C07C31/08
Inventor 周春平黄龙易金华张旭李松
Owner WUHAN JINZHONG PETROCHEM ENG
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