Design of control scheme for diisobutylene production by reactive distillation

Abstract Diisobutylene (DIB) is an excellent chemical intermediate. Recently, a new process of producing DIB in high purity and gasoline additive from FCC C₄ by reactive distillation has been proposed. And the research on the control strategy of the DIB production process by reactive distillation technology is still in its infancy since it is complicated to control the stability for reactive distillation due to its high degree of nonlinearity. Aspen dynamic software was used for dynamic simulation. The temperature control scheme, component temperature joint control scheme and component temperature cascade control scheme were developed for DIB production by reactive distillation. The three control systems were tested and compared with (±10)% feed flow disturbance and (±5)% composition disturbance. Results show that the component temperature cascade control scheme performs better which ensures the requirements that the purity of DIB is 99%, the purity of triisobutylene is less than 10%, and the conversion rate of isobutylene is greater than 99%. And the final stable time is about 5 h. The research results can provide a basis for the industrial application of the DIB production process.

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	CHEN Zihao
	ZHANG Zisheng
	ZHOU Jinbo
	LI Changming
	LI Hong
	GAO Xin
	LI Xingang

Keywords： diisobutylene； reactive distillation； process control； cascade control； computer simulation

Received 2021-02-26;

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CHEN Zihao, ZHANG Zisheng, ZHOU Jinbo, LI Changming, LI Hong, GAO Xin, LI Xingang.Design of control scheme for diisobutylene production by reactive distillation[J] Chemcial Industry and Engineering, 2022,V39(2): 117-127

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