Tail gas circulating process in acrylic acid production by propane one-step method

A technology of tail gas circulation and acrylic acid, which is applied in the preparation of carboxylate, chemical instruments and methods, and the preparation of organic compounds, to achieve the effects of reducing consumption, ensuring yield, and enhancing competitiveness

Active Publication Date: 2013-07-10
中石油吉林化工工程有限公司
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AI Technical Summary

Problems solved by technology

[0012] 3. Traditional craftsmanship
[0015] At present, there is no report on the application of reaction tail gas circulation technology to the one-step production of acrylic acid from propane. In view of the multiple advantages of

Method used

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  • Tail gas circulating process in acrylic acid production by propane one-step method
  • Tail gas circulating process in acrylic acid production by propane one-step method

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] The stream number 1 in Fig. 1 is the tail gas circulation material, the stream number 2 is the top material of the absorption tower, the stream number 3 is the waste gas incineration material, the stream number 4 is the reactor feed, and the stream number 5 is the crude acrylic acid output.

[0026] Taking a medium-sized test device as an example, using the reaction tail gas circulation process, many tests have proved that most of the gas from the top of the washing tower 2 is used as the circulating gas, and it is better to send 80% to 90% of the circulating gas to the compressor 3. It is best to feed 85% of the circulating gas into the compressor 3, which not only avoids the composition of the reaction gas from being in the explosion range, but also makes full use of propane resources, ensuring a certain conversion rate.

[0...

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Abstract

The invention relates to a tail gas circulating process in acrylic acid production by chemical product materials through a propane one-step method. The tail gas circulating process is characterized by comprising the following steps of: entering steam, oxygen gas and nitrogen gas from a pre-mixer and then entering a charging mixer with propane; feeding the mixture to an oxidation reactor for carrying out chemical reaction after the materials are sufficiently mixed to generate acrylic acid and carbon monoxide, carbon dioxide, acetic acid and propylene by-products; exchanging heat for the reaction products through a first cooler, enabling the heat-exchanged reaction products to enter a washing tower, and using most of emitted gases from the tower top of the washing tower as circulating gases. The tail gas circulating process has the advantages that part of the propane-containing reaction tail gases are compressed and returned to the reactor by adopting the reaction tail gas circulating process for continuously participating in the oxidization reaction, so that the consumption of the propane is reduced. If the circulation volume is extremely large, by-product Co is accumulated in a vast manner and safety hazard is generated due to extremely high CO concentration; if the circulation volume is extremely small, the total yield of the reaction is reduced, and 85% of circulated gases are preferably fed to a compressor.

Description

technical field [0001] The invention relates to a raw material for chemical products, more specifically, to a tail gas circulation process in the production of acrylic acid. Background technique [0002] Acrylic acid is an important raw material of organic chemical industry, widely used in superabsorbent resin, coating, textile and other chemical production fields. Acrylic acid preparation technology mainly includes acrylonitrile hydrolysis method, cyanoethanol method, Reppe method and propylene gas-phase two-step oxidation method. At present, propylene gas-phase two-step oxidation method is mainly used in the world. In recent years, the one-step oxidation of acrylic acid using propane and oxygen as raw materials with suitable catalysts has become a research hotspot. In the traditional two-step gas-phase oxidation of propylene, the first step is to oxidize propylene to produce acrolein; the second step is to oxidize acrolein to obtain acrylic acid. Because the two-step prep...

Claims

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Application Information

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IPC IPC(8): C07C57/05C07C51/215
Inventor 胡明亮刘学线刘利巩传志王宝杰梁宏斌祝涛杨莉史家伟
Owner 中石油吉林化工工程有限公司
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