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Pilot plant and process for preparing acrylic acid through propylene oxidation with tail gas circulation

A technology of propylene oxidation and acrylic acid, which is applied in the preparation of organic compounds, organic chemistry, carbon-based compounds, etc., can solve the problems of difficult to control the amount of exhaust gas circulation, complex exhaust gas composition, difficult to control flow, etc., to avoid changes in exhaust gas composition, The effect of real catalyst performance

Pending Publication Date: 2021-11-12
兰州金润宏成新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of the tail gas is complex, it contains a large amount of water vapor, and it is difficult to control the flow rate. Although the tail gas recycling technology has been applied in industrial production, it has not been reported in a pilot-scale device.
Because the amount of tail gas circulation is difficult to control, the existing technology generally treats tail gas as waste gas after product separation
Therefore, the existing pilot-scale technology cannot simulate the actual production well, and better evaluate the performance of the catalyst

Method used

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  • Pilot plant and process for preparing acrylic acid through propylene oxidation with tail gas circulation
  • Pilot plant and process for preparing acrylic acid through propylene oxidation with tail gas circulation
  • Pilot plant and process for preparing acrylic acid through propylene oxidation with tail gas circulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 1 The shown pilot plant for producing acrylic acid by propylene oxidation includes: feed unit, reaction unit, separation unit and tail gas treatment unit. The units are connected by pipelines.

[0045] Among them, the feed unit is composed of propylene feed and flow control system, air feed and flow control system, preheater 1, water feed and flow control system, vaporizer 2, and mixer 3;

[0046] The propylene feed and flow control system, the air feed and flow control system, and the water feed and flow control system are in parallel relationship. The propylene feed and flow control system is connected to the mixer 3, the air feed and flow control system is connected to the preheater 1, the water feed and flow control system is connected to the vaporizer 2, and the materials from the preheater and the vaporizer The water vapor that comes out enters the mixer 3 and mixes with propylene.

[0047] The reaction unit includes a trans-acrylaldehyde reactor...

Embodiment 2

[0060] The difference between the propylene oxidation and acrylic acid pilot plant and Example 1 is that the feed unit consists of propylene feed and flow control system, nitrogen and air feed and flow control and preheater, water and flow control and vaporizer, and mixing device composition. The catalyst loading is 2.5L. All the other are identical with embodiment 1.

[0061] After setting the reaction temperature and pressure according to the reaction requirements, the feed of propylene, nitrogen, air and water vapor is started, and all the tail gas enters the exhaust system at this time. When the propylene feed is gradually increased from the set load of 10% to 50%, 90% of the tail gas is vented, and 10% of the tail gas is dried and mixed with steam feed to enter the reactor. Then gradually increase the propylene feed to 100% load, and the propylene oxidation reaction starts to proceed stably.

[0062] After the reaction was stable, the yield of acrylic acid and the comp...

Embodiment 3

[0064] The pilot plant of this embodiment is the same as that of Embodiment 1. The catalyst loading is 3.5L.

[0065] After setting the reaction temperature and pressure according to the reaction requirements, the feed of propylene, air and water vapor is started, and all the tail gas enters the exhaust system at this time. When the propylene feed is gradually increased from the set load of 10% to 60%, 50% of the tail gas is vented, and 50% of the tail gas is dried and mixed with steam feed to enter the reactor. Then gradually increase the propylene feed to 100% load, and the propylene oxidation reaction starts to proceed stably.

[0066] After the reaction was stable, the yield of acrylic acid and the composition of the circulating tail gas were analyzed.

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Abstract

The invention discloses a pilot plant and process for preparing acrylic acid through propylene oxidation with tail gas circulation. The pilot plant comprises the following units: a feeding unit, a reaction unit, a reaction product separation unit and a tail gas treatment unit, the units are sequentially connected according to the flow direction of material flow; the reaction unit comprises a first reaction acrolein reactor and a second reaction acrylic acid reactor; and the tail gas treatment unit comprises a dryer and a gas circulation compressor, and the tail gas discharged by the reaction product separation unit enters the dryer, passes through the gas circulation compressor and returns to the feeding unit. According to the invention, pilot scale reaction feed simulates industrial grade feed composition using circulating tail gas, and the catalyst performance is truly evaluated while the reaction process is operated stably.

Description

[0001] This application claims the priority of the following earlier application: the patent application number 202010346538.3 submitted to the State Intellectual Property Office of China on April 27, 2020, and the title of the invention is "A pilot plant and process for propylene oxidation to acrylic acid with tail gas circulation ” of the earlier application. The entirety of said prior application is incorporated by reference into this application. technical field [0002] The invention belongs to the field of acrylic acid production, and specifically relates to a pilot plant and process for producing acrylic acid by propylene oxidation with tail gas circulation. Background technique [0003] Propylene is mixed with air and steam and undergoes two-step oxidation to prepare acrylic acid under the action of a catalyst. In the acrylic acid production plant, in order to operate more smoothly, the tail gas generated during the reaction process can be recycled back to the react...

Claims

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Application Information

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IPC IPC(8): C07C51/235C07C57/04C07C45/35C07C47/22
CPCC07C51/235C07C57/04C07C45/35C07C47/22
Inventor 谷育英杨柏平张小工
Owner 兰州金润宏成新材料科技有限公司
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