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Coupling production process of preparing ethanol from acetic acid

A production process, the technology of acetic acid, is applied in the field of coupled production process of acetic acid to ethanol, which can solve the problems of low conversion rate and selectivity of catalyst, increase of raw material cost, loss of ethanol, etc., to increase the added value of the factory, high hydrogen utilization rate, The effect of energy consumption reduction

Active Publication Date: 2018-07-13
河南顺达新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrogenation of acetic esterification needs to go through the esterification process first. In this process, ethanol is both a raw material and a product. There will inevitably be a loss of ethanol during the process cycle, which will increase the cost of raw materials per unit of ethanol production, and at the same time, the conversion rate and selectivity of the catalyst are low. , low productivity per unit time

Method used

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  • Coupling production process of preparing ethanol from acetic acid
  • Coupling production process of preparing ethanol from acetic acid
  • Coupling production process of preparing ethanol from acetic acid

Examples

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Comparison scheme
Effect test

Embodiment 1

[0048] A coupled production process for preparing ethanol from acetic acid, using acetic acid and acetate as reaction raw materials, including three sections of hydrogenation of acetic acid, hydrogenation of acetate and purification of crude product. The specific steps are:

[0049] A. Hydrogenation of acetic acid

[0050] Acetic acid and hydrogen are preheated separately and enter the vaporization device Ⅰ for vaporization and mixing. After being heated by the heat exchange unit, they are sent to the bottom of the reactor Ⅰ. The reaction mixture flows upwards, passes through the hydrogenation catalyst bed of the reactor Ⅰ, and undergoes catalytic hydrogenation. react to generate ethanol; the catalyst is a supported platinum / silver catalyst, the reaction temperature is 300-320° C., and the reaction pressure is 3.0-4.0 MPa.

[0051] The reaction product enters the gas-liquid separator Ⅰ for separation, and the liquid crude ethanol is directly sent to the crude product purifica...

Embodiment 2

[0058] A coupled production process for preparing ethanol from acetic acid, using acetic acid and acetate as reaction raw materials, including three sections of hydrogenation of acetic acid, hydrogenation of acetate and purification of crude product. The specific steps are:

[0059] A. Hydrogenation of acetic acid

[0060] Acetic acid and hydrogen are preheated separately and enter the vaporization device Ⅰ for vaporization and mixing. After being heated by the heat exchange unit, they are sent to the bottom of the reactor Ⅰ. The reaction mixture flows upwards, passes through the hydrogenation catalyst bed of the reactor Ⅰ, and undergoes catalytic hydrogenation. react to generate ethanol; the catalyst is a loaded platinum / silver catalyst, the reaction temperature is 320-340° C., and the reaction pressure is 2.5-3.5 MPa.

[0061] The reaction product enters the gas-liquid separator Ⅰ for separation, and the liquid crude ethanol is directly sent to the crude product purificatio...

Embodiment 3

[0068] This embodiment is Comparative Example 1.

[0069] The reaction conditions of this example are basically the same as those of Example 1, the difference being that only the acetic acid hydrogenation section and the crude product purification section are carried out; the hydrogen-rich tail gas produced in the acetic acid hydrogenation section directly enters the waste gas treatment system and does not participate in the cyclic reaction. The hydrogenation catalyst of the acetic acid hydrogenation section, the hydrogenation reaction parameters and the parameters of the crude product purification section are all the same as those in Example 1.

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Abstract

The invention discloses a coupling production process for preparing alcohol through acetic acid. Acetic acid and / or acetate serve as reaction raw materials to prepare high-purity alcohol, and the coupling production process comprises three sections of acetic acid hydrogenation, acetate hydrogenation and crude product purification. In the section of acetic acid hydrogenation, acetic acid and hydrogen serve as raw materials to prepare alcohol; in the section of acetate hydrogenation, acetate and hydrogen-rich tail gas from the section of acetic acid hydrogenation serve as raw materials to prepare alcohol; crude alcohol is subjected to the section of crude product purification, and then high-purity alcohol is obtained. Continuous production is carried out, hydrogen is subjected to deep reaction, the raw materials have higher conversion rate and yield, operation continuity and stability are very high, and in the same scale capacity, investment is greatly reduced; moreover, the reaction tail gas and the reaction heat are reasonably recycled and used, high-quality steam can be by-produced, the additional value is increased for a factory, and the requirement of cleaner production is met well.

Description

technical field [0001] The invention relates to a coupled production process for preparing ethanol from acetic acid, and belongs to the technical field of chemical synthesis. Background technique [0002] Ethanol is the earliest and most widely used fatty alcohol, and it is also the main component of wine. Ethanol is a colorless, volatile, flammable liquid at room temperature. Ethanol has a wide range of uses. For example, it can be used to produce various chemical raw materials such as acetaldehyde, ether, ethyl acetate, ethylamine, and ethylene oxide. , plastics, man-made fibers, detergents and other fields are widely used. [0003] At present, there are mainly two types of fuel ethanol process routes: (1) ethanol production by microbiological fermentation technology using grain and cellulose as raw materials; (2) production of ethanol by acetic acid hydrogenation chemical method. [0004] (1) Preparation of ethanol by fermentation [0005] The first-generation fuel et...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/149C07C29/76C07C31/08
CPCC07C29/149C07C29/76C07C31/08Y02P20/10Y02P20/50
Inventor 汤广斌潘科甘道才
Owner 河南顺达新能源科技有限公司
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