S-APO Propylene Oxide Technology and Catalyst

Propylene oxide (PO)is a raw material for the production of polyether polyols and, further, polyurethanes. S-APO propylene oxide technology is based on propylene, isopropylbenzene hydrogen peroxide (CHP), air, and hydrogen as raw materials, through the oxidation of isopropylbenzene. Propylene epoxidation and dimethyl benzyl alcohol (DMBA) hydrogen hydrolysis of isopropylbenzene, isopropyilbenzene recycling to produce propylene oxide. Since 2003, the Shanghai Institute has conducted comprehensive research on the complete set of technology for S-APO synthesis of PO, and successfully developed high-performance titanium-containing mesoporous propylene epoxidation catalysts and dual-function DMBA hydrogenolysis catalysts with superhydrophobic properties. Based on the above catalyst, a greenPO package technology (S-APO) with atomic economic reaction characteristics was successfully developed.

The project has obtained 43 authorized invention patents in China and won the second prize of the SINOPEC ProspectiveBasic Research Science Award.

S-APO propylene oxide technology is a green and environmentally friendly PO complete set technology with economic characteristics of atomic reaction. The 150,000 tons/year PO industrial demonstration plant will be built in Tianjin Petrochemical Co., LTD. Its technical characteristics are as follows:

◆ The epoxidation reaction system is safe and efficient: propylene epoxidation reaction and control system with multiple stages in series and heat removal between stages; Higher concentration of CHP raw materials and lower propylene /CHP ratio can be used to reduce energy consumption; According to the different reactivity of the catalyst life cycle, reasonable arrangement of reactor sequence can ensure the full conversion of CHP and eliminate the safety risk.

◆ High efficiency and energy saving of hydrogenolysis reaction system: the effective coupling of dewatering and hydrogenation of dimethyl benzyl alcohol was developed and the dual-function PD-based hydrogenolysis catalyst was successfully developed. According to the characteristics of bifunctional catalyst, the two-stage hydrogen hydrolysis process was cleverly designed to achieve the unity of high

selection and high conversion of catalyst, and significantly reduce the loss of isopropylbenzene.

◆ Efficient product refining process and excellent product quality: organic acid enrichment -alkali washing/water washing removal process, a small part of the reaction liquid product using efficient alkali washing/water washing equipment to effectively remove organic acids, reduce the loss of PO in the alkali washing process. PO extractive distillation process and extractant purification process were developed to improve the purity of circulating extractant and Po yield, and the purity of PO products was reached more than 99.99%.

The S-APO propylene oxide package includes two catalysts: superhydrophobic Ti/HMS epoxidation catalyst and bifunctionalPD-based hydrolysis catalyst.

The main characteristics of Ti/HMS epoxidation catalyst are as follows:

◆ The S-APO propylene oxide package includes two catalysts: superhydrophobic Ti/HMS epoxidation catalyst and bifunctionalPD-based hydrolysis catalyst.

◆ Excellent performance of epoxidation catalyst: Based on the principle of bionics for the first time, Ti/HMS, a highly efficient titanium-containing mesoporous molecular iolite epoxidation catalyst with ultra porous structure and superhydrophobic properties for the oxidation of propylene to PO by CHP was created by using the superhydrophobic properties of lotus leaf and its ultrananostructure and surface waxy layer mechanism.

◆ High activity: Ti/HMS epoxidation catalyst CHP conversion reaches more than 99%.

◆ High selectivity: Ti/HMS epoxidation catalyst, PO and DMBA selectivity of more than 99%.

◆ High stability: Ti/HMS epoxide catalyst, life of 612 months (similar products life of 4.5-9 months).

◆ Environmentally friendly: the catalyst has no harmful components and corrosive components, and does not pollute the environment.

The main features of bifunctional PD-based hydrolysis catalyst are as follows:

◆ High activity: the DMBA conversion rate of PD-based hydrolysis catalyst is achieved more than 99.9%.

◆ High selectivity: PD-based hydrogenolysis catalyst, isopropylbenzene selectivity reached more than 99.5%.

◆ High stability: The use of dual-function PD-based hydrogen hydrolysis catalyst, life of more than 2 years, to maintain a long period of stable operation, to maintain the reaction performance during operation.

◆ Environmentally friendly: the catalyst has no harmful components and corrosive components, and does not pollute the environment.

Built 150,000 tons/year S-APO propylene oxide plant in Tianjin Petrochemical. In 2022, S-APO propylene oxide technology will complete the license of 300,000 tons/year PO plant for the Zhenhai refining and chemical industry.

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