Method for preparation of ethanol by acetic acid hydrogenation

A hydrogen preparation and ethyl acetate technology, applied in the field of preparation of highly selective ethanol products, can solve problems such as high investment costs, unqualified products, and large deacidification towers

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 extr

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  • Method for preparation of ethanol by acetic acid hydrogenation

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Embodiment Construction

[0057] The following examples are illustrative descriptions of the present invention in more detail, but the present invention is not limited to these examples.

[0058] In this embodiment, the specific flow chart is shown in the attachment figure 1 shown.

[0059] 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 preparation 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 first rectification tower, sending first tower bottom fraction to a second rectification tower, returning part of second overhead fraction into a hydrogenation reactor involved in (1), and recovering part of the second overhead fraction as a mixed type solvent product, sending second tower bottom fraction into a neutralization reactor, adding an alkaline substance to carry out neutralization reaction; and sending the neutralized second tower bottom fraction into a third rectification tower. The method can lower energy consumption and improve the quality of ethanol products.

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...

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Application Information

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IPC IPC(8): C07C31/08C07C29/149C07C29/74
Inventor 黄龙戴伟田保亮王国清杨溢李宝芹唐国旗彭晖陈仕萍危亮田南黎园胡建波胡亚敏周莹汪永福周茹英沙鑫佚
Owner CHINA PETROLEUM & CHEM CORP
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