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A device and method for producing ethanol by catalytic hydrogenation of acetic acid or acetate

A technology for 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, reducing the hydrogen-acid ratio of the system, low-level operation of acetic acid, etc., to achieve control The effect of bed temperature, reduction of hydrogen-acid ratio, and good technical economy

Active Publication Date: 2016-02-17
PUJING CHEM IND SHA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2011, about 2.4 million tons of acetic acid production capacity was added, while the demand was only 4.8 million tons. The domestic acetic acid production capacity was seriously oversupplied, 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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  • A device and method for producing ethanol by catalytic hydrogenation of acetic acid or acetate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 Shown: a device for producing ethanol by catalyzing hydrogenation reaction of acetic acid or acetate, including a first reactor A, a second reactor B, a first gas-liquid separator C, a second gas-liquid separator D, and circulating hydrogen gas Compressor E, first heater F, first heat exchanger G, second heater H, second heat exchanger I. The heater F is connected to the reactor A through a pipeline; the first reactor A is connected to the first heat exchanger G and the first gas-liquid separator C through a pipeline in turn, and the gas phase outlet of the first gas-liquid separator C is connected to the first gas-liquid separator C in sequence. A heat exchanger G and a second heater H; the outlet flow of the second heater H is connected to the second reactor B through a pipeline; the outlet pipeline of the second reactor B is connected to the second heat exchanger I and the second gas-liquid separation in sequence Device D; the gas phase outlet of th...

Embodiment 2

[0035] according to figure 1 Shown, adopt technological process of the present invention. The first reactor A and the second reactor B are continuous heat exchange shell and tube reactors. The reactors use saturated process water for heat exchange and by-product steam. The reactors are filled with platinum metal carrier composite catalysts of the same quality. . The feed is acetic acid and hydrogen with a purity of 99.8%, the inlet temperature of reactor A is 200°C, the reaction pressure is 1.5MPa, and the weight space velocity of acetic acid is 0.1h -1 , the molar ratio of hydrogen to acid is 100:1; the inlet temperature of reactor B is 200°C, the reaction pressure is 1.48MPa, and the weight space velocity of acetic acid is 0.1h -1 . The mass ratio of the two acetic acid feed materials is 1:1.

[0036] The test proves:

[0037] 1. The hydrogen-acid ratio of the whole reaction system is 50:1;

[0038] 2. The actual hydrogen-acid ratio of the first reactor A and the secon...

Embodiment 3

[0042] according to figure 1 As shown, adopting the technological process of the present invention, the first reactor A is a layered fixed-bed reactor; the second reactor B is a continuous heat exchange tubular reactor, and the heat exchange medium of the second reactor B is heat transfer oil, Both the first reactor A and the second reactor B are filled with the same platinum-containing metal carrier composite catalyst, and the mass ratio of the catalyst bed filled catalyst in the first reactor A and the second reactor B is 1:1.2. The feed was acetic acid and hydrogen with a purity of 99.8%. The inlet temperature of reactor A is 350°C, the reaction pressure is 3.0MPa, and the weight space velocity of acetic acid is 0.7h -1 , the molar ratio of hydrogen to acid is 20:1; the inlet temperature of reactor B is 350°C, the reaction pressure is 2.98MPa, and the weight space velocity of acetic acid is 0.7h -1 . The mass ratio of two acetic acid feed materials is 1: 1.2

[0043] Th...

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Abstract

The invention relates to a device and a method for multistage acetic acid or acetate catalytic hydrogenation-based ethanol preparation. The device comprises a reaction system, a hydrogen recycle compressor and gas-liquid separation devices. The reaction system comprises at least two reactors and the reactors are connected in series. The hydrogen recycle compressor is connected to the top of a first reactor by a hydrogen circulating pipe. The back part of each one of all reactors is provided with one gas-liquid separation device. The method comprises the following steps of dividing a raw material into multiple raw material parts, mixing the first raw material part and hydrogen from the outlet of the hydrogen recycle compressor, heating the mixture to a reaction temperature by a last-stage heat exchanger and a first-stage heater, feeding the heated mixture to the first reactor for a reaction, feeding the product discharged by the outlet of the first reactor into a first-stage heat exchanger, then feeding the product treated by the first-stage heat exchanger into the first gas-liquid separation device, carrying out separation to obtain a liquid product which is ethanol, mixing the liquid product and the raw material, heating the mixture to the reaction temperature by the first-stage heat exchanger and a next-stage heater, and feeding the heated mixture into a next reactor. Compared with the prior art, the device and the method have the advantages of low energy consumption and industrialization.

Description

technical field [0001] The invention relates to a device and method for producing ethanol by catalytic hydrogenation of multi-stage acetic acid or acetate, in particular to a new process technology for producing ethanol through a non-grain raw material route. Background technique [0002] Acetic acid is an environmentally friendly organic acid, and is an important chemical intermediate and solvent for chemical reactions. It is often used to prepare vinyl acetate monomer (VCM), acetic anhydride, acetate, chloroacetic acid, polyvinyl alcohol and metal acetate Wait. 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 domestic acetic acid production capacity was seriously oversuppl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/08C07C29/149
CPCC07C29/149C07C31/08
Inventor 吴文章张博计扬吴飞明
Owner PUJING CHEM IND SHA
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