Ethanol preparation method

A technology for the preparation of ethanol and hydrogen, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as high investment costs, unqualified products, and high energy consumption

Inactive 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 s

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  • Ethanol preparation method

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[0065] The following embodiments are more detailed examples to describe the present invention, but the present invention is not limited to these embodiments. In this embodiment, the specific flowchart is as attached figure 1 Shown.

[0066] First, the acetic acid raw material, the return material and the hydrogen are preheated to form a steam feed stream, and the steam feed stream is introduced 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 contains: (1) cobalt, in which the content of cobalt metal accounts for 18wt% of the total weight of the catalyst; (2) molybdenum and tin, respectively account for 3wt% and 34wt% of the total weight of the catalyst; (3) boron and Bismuth accounts for 2wt% and 5wt% of the total weight of the catalyst, and the balance is silica. The catalyst is prepared by bal...

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Abstract

The invention provides a low-energy consumption method for preparation of ethanol by acetic acid hydrogenation. The method includes the steps of: (1) first stage gas phase hydrogenation; (2) gas-liquid separation and second stage hydrogenation; (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 the second tower top fraction into a hydrogenation reactor of (1), and recovering part of the second tower top fraction as a mixed 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 to a third rectification tower. 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] There are two ways to use acetic acid as a raw material to produce ethanol products. One is to generate acetate through esterification of acetic acid, then hydrogenate acetate to generate ethanol, and then refine it to produce ethanol products; the other is to directly hydrogenate acetic acid to generate ethanol, which is then refined process to produce ethanol products. Compared with the second method, the first method has an extra esterification process, and a large amount of ethanol needs to be recycled as an esterification raw material, which increases the size of the hydrogenation reactor and the size and energy consumption of the heat exchangers before and after it, at least Part of the refining process is also doubled. The a...

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Application Information

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IPC IPC(8): C07C31/08C07C29/149C07C29/80
Inventor 黄龙戴伟田保亮王国清彭晖杨溢唐国旗李宝芹周莹胡亚敏汪永福李真泽周茹英陈仕萍田南黎园危亮
Owner CHINA PETROLEUM & CHEM CORP
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