Multivariable predictive control of p-xylene oxidation reaction process

XING Jianliang; ZHAO Jun; JIANG Pengfei; ZHONG Weimin; YUAN Weikang

doi:10.3969/j.issn.0438-1157.2012.09.009

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Multivariable predictive control of p-xylene oxidation reaction process

更新时间：2025-12-10

- Multivariable predictive control of p-xylene oxidation reaction process
- CIESC Journal Issue 9, Pages: 2726-2732(2012)
- 作者机构：
  
  1. 华东理工大学化学工程联合国家重点实验室,上海,200237
  2. 浙江大学控制科学与工程学系,浙江,杭州,310027
  3. 华东理工大学化工过程先进控制与优化技术教育部重点实验室,上海,200237
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2012.09.009
  CLC： Q245.12TP273
- Online First：05 September 2012，
  
  Published：05 September 2012
- 稿件说明：
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XING Jianliang, ZHAO Jun, JIANG Pengfei, et al. Multivariable predictive control of p-xylene oxidation reaction process[J]. CIESC Journal, 2012, (9): 2726-2732.
DOI：

XING Jianliang, ZHAO Jun, JIANG Pengfei, et al. Multivariable predictive control of p-xylene oxidation reaction process[J]. CIESC Journal, 2012, (9): 2726-2732. DOI： 10.3969/j.issn.0438-1157.2012.09.009.

摘要

精对苯二甲酸(purified terephthalic acid

PTA)是我国最重要的化工原料之一。对二甲苯(p-xylene

PX)氧化反应器是PTA装置的核心运行设备

PX氧化反应是高温高压下的固液相催化反应

其关系到整个装置的产量和消耗。目前

PX氧化反应过程的常规控制虽然可以满足工业装置的生产

但关键产品指标粗对苯二甲酸中对羧基苯甲醛(4-carboxybenzaldehyde

4-CBA)含量和尾气氧浓度波动范围较大

不利于工业装置的进一步优化操作。本文利用FRONT-Suite先进控制软件进行了工业PTA装置PX氧化反应过程的多变量预测控制

稳定优化了关键控制指标反应器尾氧浓度和第一结晶器尾氧浓度以及质量指标4-CBA含量的控制

取得了显著的控制效果。

Abstract

Purified terephthalic acid is one of the most important chemical raw materials.p-Xylene oxidation is a solid-liquid phased catalytic reaction process under high temperature and high pressure.The reactor is the core unit of purified terephthalic acid plant

which affects the product yield and quality noticeably.Current traditional control strategy can meet the demands of the industrial operation

but the variation of the key quality indexes-the concentration of 4-carboxybenzaldehyde in crude terephthalic acid and the oxygen content in the exhaust are big

which influence the further optimization of the process.In this paper

in order to solve this problem

a multivariable predictive control strategy fulfilled by the FRONT-Suite software is put forward.After the application

the control performance on the 4-carboxybenzaldehyde concentration in crude terephthalic acid and oxygen content in the exhaust of p-xylene oxidation process are improved obviously.

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