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Method for preparing ethanol through acetic acid hydrogenation

A technology for hydrogen preparation and ethyl acetate is applied in the field of preparing high-selectivity ethanol products, and can solve the problems of high investment cost, high material requirements, large size of deacidification tower, etc.

Active Publication Date: 2016-05-11
CHINA PETROLEUM & CHEM CORP +3
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Problems solved by technology

In these patents, acetic acid is generally removed first by rectification, which can reduce the material requirements in the subsequent separation, thereby reducing investment costs, but there are also some problems: ethanol and ethanol, which account for the vast majority of product quality Water needs to be vaporized, so the energy consumption of rectification and deacidification is extremely high, and the deacidification tower has a large size and high material requirements, and the investment cost is extremely high; and in the actual rectification separation, there may be a very small amount of In the case of acetic acid, fuel ethanol and industrial ethanol products have strict requirements on acidity, so the product is unqualified in the case of operational fluctuations

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  • Method for preparing ethanol through acetic acid hydrogenation

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Embodiment Construction

[0055] The following examples are illustrative descriptions of the present invention in more detail, but the present invention is not limited to these examples.

[0056] In this embodiment, the specific flow chart is shown in the attachment figure 1 shown.

[0057] First, preheat the acetic acid raw material, return material and hydrogen to form a steam feed stream, and introduce the steam feed stream into the reactor R101 equipped with a gas-phase hydrogenation catalyst. The catalyst for the gas-phase hydrogenation of acetic acid is produced by Beijing Research Institute of Chemical Industry acetic acid hydrogenation catalyst, the catalyst contains: (1) cobalt, wherein the cobalt metal content accounts for 18wt% of the total catalyst weight; (2) molybdenum and tin account for 3wt% and 34wt% of the total catalyst weight; (3) boron and Bismuth accounts for 2wt% and 5wt% of the total catalyst weight respectively, and the balance is silicon dioxide. The catalyst is prepared by ...

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Abstract

The invention provides a low-energy consumption method for preparing ethanol through acetic acid hydrogenation. The method comprises 1, gas phase hydrogenation, 2, gas-liquid separation, 3, esterification reaction and 4, product refining: feeding a liquid product B into a first rectifying tower, feeding a part of the first rectifying tower top fraction containing acetaldehyde, ethyl acetate and acetone back to a gas phase hydrogenation reactor, feeding the first rectifying tower bottom fraction as a crude ethanol product containing ethanol, ethyl acetate and water into a neutralization reactor, adding an alkaline substance into the neutralization reactor, carrying out a neutralization reaction process, feeding the neutralized first rectifying tower bottom fraction into a second rectifying tower, and carrying out separation to obtain a second rectifying tower top fraction containing ethanol and water and a second rectifying tower top fraction containing water, butanol and acetate, wherein the second rectifying tower top fraction has ethanol content of 85-95wt% and an acidity value of 0-25mg / L. The method can reduce energy consumption and improve ethanol product quality.

Description

technical field [0001] The present invention relates to a kind of method of producing ethanol, more specifically, relate to a kind of method of preparing highly selective ethanol product by acetic acid hydrogenation. Background technique [0002] Ethanol is the earliest and most widely used fatty alcohol, and it is also the main component of wine. At present, the industrial production methods of ethanol mainly include fermentation method and ethylene hydration method. Ethylene hydration method is developed along with the rise of petrochemical industry, including indirect hydration method and direct hydration method. Due to the increase of ethylene production cost in recent years, the ethylene process is basically in a state of suspension in my country. The main raw material of the fermentation method is crops (including corn, sugarcane, sorghum, cassava, rice, etc.), and ethanol is obtained by fermenting starch in the crops. [0003] The raw materials used by major ethano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/149C07C29/92C07C31/08
Inventor 黄龙戴伟李宝芹王国清田保亮杨溢唐国旗李勇胡亚敏周莹李艳明沙鑫佚陈仕萍田南黎园胡建波
Owner CHINA PETROLEUM & CHEM CORP
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