The new technology for direct oxidation of propylene to propylene oxide by hydrogen peroxide developed by the Dalian Institute of Chemical Physics was approved last week by an expert group organized by the Science and Technology Department of Liaoning Province. This new technology will change the serious drawbacks of the traditional propylene oxide production process and achieve the goal of the industry-friendly environment-friendly propylene oxide process route.
Propylene oxide is a very important basic chemical raw material. Previous industrial production methods mainly include the chlorohydrin method and the co-oxidation method. The chlorohydrin method consumes a large amount of chlorine, causing serious equipment corrosion and environmental pollution. The co-oxidation method utilizes the alkyl hydrogen peroxide generated by the automatic oxidation of ethylbenzene or isobutane as an oxygen source to catalyze the epoxidation of propylene to generate propylene oxide and a large number of co-products, resulting in a complicated production process and huge investment in construction. Therefore, the development of environmentally friendly, unlinked propylene oxide preparation method has always been the goal of researchers.
The new technology for the direct oxidation of propylene to propylene oxide by hydrogen peroxide developed by the research group headed by Dali Dalian Institute of Technology, compared with the in-situ coupling method developed by the project team, simplifies the process and reduces the loss of the catalyst; and the traditional industry Compared with the production method, the process is simple, environmentally friendly, and there is no problem of joint products; under the optimized process conditions, the yield of propylene oxide relative to hydrogen peroxide remains above 87% after the catalyst is recycled for 5 times, and the product distribution selectivity is greater than 99%.
The new method can directly catalyze the oxidation of propylene with hydrogen peroxide and generate propylene oxide with high selectivity under the action of a new-generation reaction-controlled phase transfer catalyst developed by the research group in a suitable solvent system. At the end of the reaction, the catalyst and the solvent can be recycled, making them environmentally friendly.
Experiments show that the new technology for the direct oxidation of propylene to propylene oxide by hydrogen peroxide and the chlorohydrin method are basically the same, but the traditional chlorohydrin method will produce 42 tons of waste water and a large amount of waste slag from the production of 1 ton of product, while the new method will produce 1 ton of product. Only 1 ton of waste water is produced, which is one-fortieth of the chlorohydrin method, and there is basically no waste residue. Compared with the two, the environmental advantages of the new method are more suitable for the national strategic needs of sustainable development. At the same time, the new method can not only solve the problems of corrosion and pollution in the traditional process route, but also has a simple process route, is suitable for industrialization, and has good economic and social benefits.
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