The synthesis of dipropylene glycol(DPG)and tripropylene glycol(TPG)from propylene ox-ide(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 ex-ternal 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 deacti-vation was preliminarily explored.
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