Method for recovering tail gas of propane oxidation preparation of acrylic acid

A technology of acrylic acid and oxidation method, which is applied in the chemical industry, chemical instruments and methods, and the preparation of organic compounds, etc. It can solve the problems affecting the economic benefits of enterprises, low propane conversion rate, environmental problems, etc., and achieves life extension, less investment, Reduce the effect of being able to shout

Active Publication Date: 2017-09-15
SOUTHWEST RES & DESIGN INST OF CHEM IND
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AI Technical Summary

Problems solved by technology

This method is very effective for the tail gas of acrylic acid produced by the two-step oxidation of propylene, but due to the low conversion rate of propane in the process of producing acrylic acid by propane oxidation, the tail gas contains some unconverted propane (≥5%). If the catalytic oxidation method is directly used, after the reaction The tail gas contains not only nitrogen, water, carbon dioxide, but also considerable unoxidized propane
Obviously, nitrogen, carbon dioxide, and propane are directly discharged into the atmosphere without recycling, which not only affects the economic benefits of the enterprise, but also brings environmental problems

Method used

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  • Method for recovering tail gas of propane oxidation preparation of acrylic acid
  • Method for recovering tail gas of propane oxidation preparation of acrylic acid
  • Method for recovering tail gas of propane oxidation preparation of acrylic acid

Examples

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example 1

[0057] In this example, propane oxidation to prepare acrylic acid tail gas recovery device and process flow are as follows figure 1 shown. During operation, the temperature of the raw material tail gas of stream 1 is 80°C, the pressure is 115kPaA, and the flow rate is 57538Nm 3 / h, the molar composition is nitrogen 49.86%, carbon monoxide 0.89%, oxygen 4.83%, carbon dioxide 0.59%, propylene 0.18%, propane 6.57%, water 37.03%, acrylic acid 0.001%, acetone 0.049%; raw material tail gas enters the tail gas preheater first I E-101 is preheated to 90°C to prevent liquid water from being precipitated by subsequent pressurization; the preheated exhaust gas enters the exhaust gas blower P-101 to pressurize to 160kPaA; then it is preheated to 250°C by the exhaust gas preheater IIE-102 , into the oxidation reactor R-101.

[0058] The oxidation reactor R-101 adopts a fixed bed reactor, and the catalyst is a supported noble metal catalyst. The catalyst particle diameter is 3-4mm, the bu...

example 2

[0064] In this example, propane oxidation to prepare acrylic acid tail gas recovery device and process flow are as follows figure 2 As shown. During operation, the tail gas temperature of stream 1 raw material is 80°C, the pressure is 115kPaA, and the flow rate is 57538Nm 3 / h, the molar composition is nitrogen 49.86%, carbon monoxide 0.89%, oxygen 4.83%, carbon dioxide 0.59%, propylene 0.18%, propane 6.57%, water 37.03%, acrylic acid 0.001%, acetone 0.049%; raw material tail gas enters the tail gas preheater first I E-101 is preheated to 90°C to prevent liquid water from being precipitated by subsequent pressurization; the preheated exhaust gas enters the exhaust gas blower P-101 to pressurize to 160kPaA; then it is preheated to 250°C by the exhaust gas preheater IIE-102 , into the oxidation reactor R-101.

[0065] The oxidation reactor R-101 adopts a fixed bed reactor, and the catalyst is a supported noble metal catalyst. The catalyst particle diameter is 3-4mm, the bulk d...

example 3

[0071] In this example, propane oxidation to prepare acrylic acid tail gas recovery device and process flow are as follows image 3 shown. During operation, the temperature of the raw material tail gas of stream 1 is 80°C, the pressure is 115kPaA, and the flow rate is 57538Nm 3 / h, the molar composition is nitrogen 49.86%, carbon monoxide 0.89%, oxygen 4.83%, carbon dioxide 0.59%, propylene 0.18%, propane 6.57%, water 37.03%, acrylic acid 0.001%, acetone 0.049%; raw material tail gas enters tail gas preheater first I E-101 is preheated to 90°C to prevent liquid water from being precipitated by subsequent pressurization; the preheated exhaust gas enters the exhaust blower P-101 to pressurize to 160kPaA; then it is preheated to 180°C by the exhaust gas preheater IIE-102 , into the oxidation reactor R-101.

[0072] The oxidation reactor R-101 adopts a fixed bed reactor, and the catalyst is a supported noble metal catalyst. The catalyst particle diameter is 3-4mm, the bulk densi...

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Abstract

The invention provides a method for recovering tail gas of propane oxidation preparation of acrylic acid and belongs to the technical field of acrylic acid tail gas treatment. The method comprises preheating and pressurizing tail gas, feeding the tail gas into an oxidation reactor, carrying out oxidation, orderly treating the reaction tail gas through a steam generator, a tail gas preheater II, a tail gas preheater I, a boiler water preheater and a desalted water preheater, recovering heat, treating the tail gas through a cooler and a gas-liquid separator, returning a part of the gas phase as recycling gas to the oxidation reactor, wherein the recycling gas is used as quenching gas, cooling and pressurizing the other part of the gas phase through a water cooler, carrying out decarburization and drying, feeding the dried gas into a cryogenic separation device, carrying out cryogenic separation to obtain a product containing greater than or equal to 99.9% of propane and fully discharging cryogenic tail gas. Through a catalytic oxidation method, oxygen and volatile organic matters in the tail gas are removed, propane, carbon dioxide and nitrogen gas are recovered and zero emission of the exhaust gas is realized. The method has the advantages of low investment in the process, low wastes, low pollutant discharge and good economic benefits, and provides guarantee for the large-scale industrialization of propane oxidation preparation of acrylic acid.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment of acrylic acid produced from propane, and specifically relates to a recovery process of tail gas produced from propane oxidation to acrylic acid. Background technique [0002] Acrylic acid is an important organic intermediate and fine chemical raw material in modern chemical industry, mainly used in the production of superabsorbent resin and acrylate. Acrylic acid and its esters have α, β unsaturated carboxylic acid structure, can be plastic polymers, can also be cross-linked polymers, can have different viscosity, hardness and other characteristics, so acrylic acid and its derivatives are widely used in chemical industry, Leather, food, textile and other industries. [0003] The production process of acrylic acid includes chlorohydrin method, high pressure Reppe method, enone method, acrylonitrile hydrolysis method, propylene oxidation method, etc. Due to the high conversion rate of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/215C07C57/04C07C7/00C07C7/148C07C9/08C01B21/04C01B32/50
CPCC01B21/045C01B2210/0003C01B2210/0014C07C7/005C07C7/14816C07C51/215C07C57/04C07C9/08Y02P20/10Y02P20/50
Inventor 李俊宏汪涛吴路平陈耀壮孙菲
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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