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Device and method for preparing ethanol through acetic acid or acetic ester catalytic hydrogenation reaction

A technology of catalytic hydrogenation and acetate, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of large hydrogen circulation, reduce the hydrogen-acid ratio of the system, and high energy consumption of compression, and achieve good results Technical economy, the effect of reducing the hydrogen-acid ratio

Active Publication Date: 2013-10-30
PUJING CHEM IND SHA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2011, about 2.4 million tons of new acetic acid production capacity was added, while the demand was only 4.8 million tons. The problem of overcapacity in the acetic acid industry was serious, which also caused the price of acetic acid to run at a low level for a long period of time.
The reaction system does not have a staged feeding process of acetic acid, so it is impossible to reduce the hydrogen-acid ratio of the system under the condition of ensuring a high hydrogen-acid molar ratio in the catalytic reaction zone, resulting in a large amount of hydrogen circulation in the process and high energy consumption for compression

Method used

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  • Device and method for preparing ethanol through acetic acid or acetic ester catalytic hydrogenation reaction

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Embodiment 1

[0026] Such as figure 1 Shown: a device for preparing ethanol by catalyzing hydrogenation reaction of acetic acid or acetate, comprising a raw material storage tank 1, a heater 2, a reactor 3, a heat exchanger 4, a gas-liquid separator 5, and a hydrogen circulation compressor 6. The reactor 3 described above contains three-stage reaction zones, and the reaction zones at all levels are arranged in series from top to bottom. The flow inlet of each reaction zone is connected to the raw material storage tank 1 through a pipeline, and the hydrogen circulation compressor 6 is passed through The hydrogen circulation pipeline is connected to the heat exchanger 4 and the heater 2 in turn, and then connected to the top of the reactor 3. The raw material storage tank 1 is respectively connected to each reaction zone of the reactor 3 through three parallel raw material delivery pipelines, one of which is a raw material delivery pipeline The pipeline is connected in parallel with the hydro...

Embodiment 2

[0035] according to figure 1 As shown, the process flow of the present invention is adopted, the catalyst is a platinum metal carrier composite, and the three-stage catalyst bed is filled with catalysts of the same weight. The feed materials are acetic acid with a purity of 99.7wt% and hydrogen with a purity of 99.8%. The inlet temperature of the catalytic bed in the first-stage reaction zone of the reactor is 200°C, the reaction pressure is 1.5MPa, and the reaction weight space velocity is 0.1 hour -1 , the molar ratio of hydrogen to acid is 120:1; the reaction temperature at the inlet of the catalytic bed in the second-stage reaction zone of the reactor is 200°C, the reaction pressure is 1.48MPa, and the reaction weight space velocity is 0.1 hour -1 ; The reaction temperature at the inlet of the catalytic bed in the third-stage reaction zone of the reactor is 200°C, the reaction pressure is 1.46MPa, and the reaction weight space velocity is 0.1 hour -1 ; The mass ratio of t...

Embodiment 3

[0042] according to figure 1 As shown, adopting the technological process of the present invention, the catalyst is a platinum metal carrier composite, which is composed of a platinum metal carrier composite, and the three-stage catalytic bed is filled with catalysts of the same weight. The feed material is acetic acid with a purity of 99.7wt% and hydrogen with a purity of 99.8%. The inlet temperature of the catalytic bed in the first-stage reaction zone of the reactor is 350°C, the reaction pressure is 3.0MPa, the reaction weight space velocity is 0.7 hours-1, and the moles of hydrogen acid The ratio is 20:1; the reaction temperature at the inlet of the catalytic bed in the second-stage reaction zone of the reactor is 350°C, the reaction pressure is 2.98MPa, and the reaction weight space velocity is 0.7 hours-1; the reaction at the inlet of the catalytic bed in the third-stage reaction zone of the reactor The temperature is 350°C, the reaction pressure is 2.96MPa, and the rea...

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Abstract

The invention relates to a device and method for preparing ethanol through acetic acid or acetic ester catalytic hydrogenation reaction. According to the device and method, acetic acid or acetic ester and hydrogen are used as raw materials, at least two reaction sections are connected in series, the acetic acid or acetic ester raw material is divided into two or more sections which enter each hydrogenation reaction section, liquid acetic acid or acetic ester or partially-liquid acetic acid or acetic ester feeds among the reaction sections to play a role in direct heat exchange and cooling and raw material supplementation, and a reaction system is provided with one recycle hydrogen compressor, so that the hydrogen acid ratio of the whole acetic acid or acetic ester hydrogenation reaction system is greatly reduced under the condition that the hydrogen acid ratio of each reaction area is higher. Compared with the prior art, by adopting the device and the method, industrial amplification of a process for producing ethanol through acetic acid or acetic ester hydrogenation is well realized, so that the device and the method can be widely applied to industrial production of ethanol.

Description

technical field [0001] The invention relates to a device and method for producing ethanol by catalytic hydrogenation of acetic acid or acetate, in particular to a new process technology for producing ethanol by hydrogenation of acetic acid or acetate in a non-petrochemical route. Background technique [0002] Acetic acid is an environmentally friendly organic acid and an important chemical intermediate and solvent for chemical reactions. It is mainly used to prepare vinyl acetate monomer (VCM), acetic anhydride, acetate, terephthalic acid (used as a solvent), Chloroacetic acid, polyvinyl alcohol, and metal acetates, etc. In 2010, my country's acetic acid production capacity was about 6 million tons per year, accounting for 30% of the global production capacity, with an output of 3.6 million tons and a domestic consumption of 3 million tons. In 2011, about 2.4 million tons of new acetic acid production capacity was added, while the demand was only 4.8 million tons. The probl...

Claims

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Application Information

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IPC IPC(8): C07C31/08C07C29/149
Inventor 吴文章张博计扬吴飞明袁友珠叶林敏张素斌
Owner PUJING CHEM IND SHA
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