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Chemcial Industry and Engineering 2024, Vol. 41 Issue (4) :45-54    DOI: 10.13353/j.issn.1004.9533.20226003
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Synthesis of dipropylene glycol and tripropylene glycol over solid acid catalyst
WANG Baohe, DUAN Chenfei, ZHANG Zhaobang, MA Jing, ZHU Jing
Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

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Abstract The synthesis of dipropylene glycol (DPG) and tripropylene glycol (TPG) from propylene oxide (PO) and propylene glycol (PG) under the catalysis of solid acid was studied in a stainless steel high-pressure batch reactor. The study showed that the catalytic activity of H-ZSM-5 molecular sieve was significantly higher than that of H-13X molecular sieve. After eliminating the influence of internal and external diffusion, the kinetic model of H-ZSM-5 molecular sieve catalyzed reaction was established and the reaction kinetic constants were determined by numerical analysis. The experimental results show that the calculated values agree well with the experimental ones. The reaction conditions were optimized by the mathematical model of reaction dynamics, which provided basic physical data for the industrial production of dipropylene glycol and tripropylene glycol. The fresh and used catalysts were characterized by X-ray diffraction, N2 adsorption and desorption measurement, Pyridine asorption FTIR, and the cause of deactivation was preliminarily explored.
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WANG Baohe
DUAN Chenfei
ZHANG Zhaobang
MA Jing
ZHU Jing
Keywordspropylene oxide (PO)   propylene glycol (PG)   dipropylene glycol (DPG)   tripropylene glycol (TPG)   H-ZSM-5   reaction kinetics     
Received 2022-03-15;
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WANG Baohe, DUAN Chenfei, ZHANG Zhaobang, MA Jing, ZHU Jing.Synthesis of dipropylene glycol and tripropylene glycol over solid acid catalyst[J]  Chemcial Industry and Engineering, 2024,V41(4): 45-54
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