Method for production of ethanol by acetic acid hydrogenation

A technology of ethanol and acetic acid, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as unqualified products, high investment costs, and high material requirements

Active Publication Date: 2016-05-11
CHINA PETROLEUM & CHEM CORP +1
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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 extr

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  • Method for production of ethanol by acetic acid hydrogenation

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Embodiment Construction

[0054] The following examples are illustrative descriptions of the present invention in more detail, but the present invention is not limited to these examples.

[0055] In this embodiment, the specific flow chart is shown in the attachment figure 1 shown.

[0056] 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 The acetic acid hydrogenation catalyst, (1) cobalt, wherein cobalt metal content accounts for 18wt% of catalyst gross weight; (2) molybdenum and tin, respectively account for 3wt% and 34wt% of catalyst gross weight; (3) boron and bismuth, respectively It accounts for 2wt% and 5wt% of the total weight of the catalyst, and the balance is silicon dioxide. Acetic acid is hydrogenated to cru...

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Abstract

The invention provides a low-energy consumption method for production of ethanol by acetic acid hydrogenation. The method comprises the steps of: (1) gas phase hydrogenation; (2) gas-liquid separation; (3) esterification reaction; and (4) product refining: sending a liquid phase product B to a neutralization reactor, adding an alkaline substance to carry out neutralization reaction, bringing the neutralization product into a first rectification tower so as to obtain first overhead fraction containing acetaldehyde, ethyl acetate and acetone and first tower bottom fraction, i.e. a crude ethanol product containing ethanol and water, returning part of the first overhead fraction into a gas phase hydrogenation reactor, and sending the first tower bottom fraction to a second rectification tower so as to obtain second tower bottom fraction containing water, ethanol, butanol and acetate. The method can reduce energy consumption and improve the quality of ethanol product.

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 my country's...

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Application Information

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IPC IPC(8): C07C29/149C07C29/92C07C31/08
Inventor 黄龙王国清戴伟田保亮杨溢彭晖李宝芹唐国旗
Owner CHINA PETROLEUM & CHEM CORP
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