Propylene oxidation unit DCS control system in crylic acid device

A technology of propylene oxidation and control system, which is applied in the direction of electrical program control, comprehensive factory control, organic chemistry, etc., can solve the problems of affecting the service life of the catalyst, increasing the separation cost of the acrylic acid refining system, increasing the steam consumption, etc., achieving considerable economic benefits, The effect of reducing human interference and safe and stable operation

Active Publication Date: 2008-03-26
中石油吉林化工工程有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, adding too much water vapor not only increases the consumption of steam, but also directly affects the service life of the catalyst, resulting in an increase in the separation cost of the rear acrylic acid refining system

Method used

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  • Propylene oxidation unit DCS control system in crylic acid device
  • Propylene oxidation unit DCS control system in crylic acid device
  • Propylene oxidation unit DCS control system in crylic acid device

Examples

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Embodiment Construction

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Taking the propylene oxidation unit of an acrylic acid plant with an annual output of 80,000 tons as an example, DCS control is used to illustrate the situation of the present invention.

[0037] The flow of steam is measured through the orifice plate and differential pressure transmitter; the flow of air is measured through Annubar and differential pressure transmitter; the flow rate of circulating exhaust gas is measured through the orifice plate and differential pressure transmitter, and the three enter the pre-mixer M- 1. Fresh propylene enters the feed mixer M-2 after flow measurement, and then enters the mixer M-2 with fresh propylene after mixing, and then enters the first reactor R-1; the reaction gas after the reaction in the first reactor enters The feed mixer M-3 is mixed with the supplementary air of the second reac...

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PUM

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Abstract

This invention discloses a kind of propylene oxidize unit DCS automation system in the crylic acid device which sets up the fresh propylene enter material flux automation system, the fresh air enter material flux automation system, vapor flux automation system, circle off-gas flux automation system, and sets up a minim water analyzer, oxygen content analyzer, propylene content analyzer, the control house setting up a DCS makes the output information of fresh propylene flux into the DCS as the main momentum signal and makes the vapor, fresh air, circle off-gas into the reactor flux signal and then into the DCS as the momentum signal all of them above composes the flux mixture ratio control system and the output signals of every analyzer enter the DSC and take part in the calculus; the merits of this invention are that uses the propylene material well and matches the vapor, the use level of oxygen, the use level circle off-gas reasonably and in the operation state concludes catalyst, temperature, pressure and so on the same state used in reactor that can reduce the manufacture cost and increase the yield and enhance the outcome 0.5 to 2 percent and ensure the operate security.

Description

technical field [0001] The invention relates to a process automatic control system in the production of acrylic acid. Background technique [0002] The process of producing acrylic acid by two-step oxidation of propylene mainly uses propylene and air as raw materials, and gas-phase oxidation reaction occurs under catalyst conditions. The oxidation process is completed in two steps. First, propylene is oxidized to acrolein, and acrolein is further oxidized to acrylic acid. The reaction equation is as follows: [0003] CH 2 =CH-CH 3 +O 2 →CH 2 =CH-CHO+H 2 O+0.34MJ (80kCal) [0004] CH 2 =CH-CHO+1 / 2O 2 →CH 2 =CH-COOH+0.25MJ(60kCal) [0005] Since this process is an exothermic strong oxidation reaction, the reaction temperature is relatively high, and in order to meet the requirements of catalyst performance and production scale, it is necessary to maintain a relatively high raw material concentration. Therefore, the mixture of propylene and oxygen is operated in a r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418C07C57/05
Inventor 刘学线李志远巩传志李欣平周江沛刘利金莉孙旭宋凯纪忠斌
Owner 中石油吉林化工工程有限公司
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