Method for preparing ethanol via hydrogenation of acetic ester based on recirculating of recovered hydrogen

A technology of acetate and ethanol, applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve problems such as large heat consumption, hydrogen waste, economic loss, etc., to reduce heating and cooling energy consumption, reduce Cost, effect of high acetate conversion

Active Publication Date: 2013-02-27
DATANG INT CHEM TECH RESINST
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Problems solved by technology

The amount of fresh hydrogen added due to the release will be significantly higher than the amount of fresh hydrogen required for the hydrogenation reaction, resulting in a large waste of hydrogen
At the same time, the reaction product needs to be cooled to at least normal temperature to condense and separate the condensable components, and then reheat the separated low-temperature circulating hydrogen, fresh hydrogen and circulating hydrogen into the reactor, which will consume a lot of heat. cause huge economic losses

Method used

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  • Method for preparing ethanol via hydrogenation of acetic ester based on recirculating of recovered hydrogen

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Embodiment

[0042] Combine below figure 1 Specific embodiments will be described. 3.5 L of hydrogenation Cu-based catalysts are loaded in the middle of the hydrogenation reactor 24, ceramic rings with the same particle size as the catalyst are installed at both ends of the reactor, and ethyl acetate is used as a raw material, and the reaction pressure of the hydrogenation reaction is 2.5 MPa (Table pressure).

[0043] Acetate 1 is pumped into the acetate preheater 20 by a high-pressure liquid feed pump, wherein the feed rate of acetate 1 is 2.65kg / h, and the high temperature product gas 9 from hydrogenation reactor 24 is in the acetate preheater Heat exchange preheating occurs in 20, and is heated to 240° C. in the acetate preheater 20 to obtain preheated acetate 3, which enters the bottom of the vaporizer 22 after preheating. During the reaction, the mixed hydrogen gas 4 obtained by mixing the fresh hydrogen gas 2 and the circulating hydrogen gas 16 is fed into the hydrogen gas preheat...

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Abstract

The invention relates to a method for preparing ethanol via hydrogenation of acetic ester based on recirculating of recovered hydrogen. The method comprises the steps of: recycling hydrogen in the gas phase of a product by using a pressure swing adsorption (PSA) device and then increasing the pressure for recirculating; heating the mixed gas of acetic ester, circulated hydrogen and fresh hydrogen by using reaction heat; heating the preheated raw material gas by medium-pressure steam and then importing into a reactor so as to realize high acetic ester conversion rate and high ethanol selectivity in the presence of a catalyst; and carrying out gas-liquid separation on the product gas obtained via the reaction, and liquefying and separating the reaction principal product ethanol, a small amount of byproducts and unreacted acetic ester to obtain an initial product. According to the method, hydrogen is recycled and recirculated via PSA so that the use of the raw material hydrogen can be greatly reduced, the reaction raw materials are preheated by fully utilizing the reaction heat so that the energy consumption of the heating and the cooling is decreased, the flow is simple and the control is simple and convenient.

Description

technical field [0001] The invention relates to a production method of ethanol. In particular, the present invention relates to a method for synthesizing ethanol by gas-phase hydrogenation of acetic ester using pressure swing adsorption to recover hydrogen and recycle. It belongs to the field of chemical technology. Background technique [0002] Ethanol (CH 3 CH 2 OH) is an important chemical raw material, which is widely used in the production and manufacture of paints, coatings, inks, medicines and food in chemical and other industrial fields; at the same time, ethanol is an important clean energy with high oxygen content , high latent heat of vaporization, and good anti-knock performance. As a vehicle fuel, it has excellent characteristics such as more complete combustion and low CO emissions, and has been promoted and recognized worldwide. [0003] my country's energy distribution is characterized by "poor oil and more coal". The relative scarcity of petroleum resour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/149
CPCY02P20/129
Inventor 李春启刘学武梅长松余铭程左玉帮
Owner DATANG INT CHEM TECH RESINST
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