10 Kt/a Engineering Design Of Direct Epoxidation Of Propylene

Propylene oxide(Propylene Oxide, PO) is an important organic chemical raw material. due to the serious problem of waste discharge in epichlorohydrin process of propylene oxide, PO clean production processes are paid attention, especially hydrogen peroxide to propylene oxide(HPPO) method are paid more attention because it’s feature of both economy and low-energy consumption.In this paper, a set of 10 KTA PO commercial plant was desigen with hydrogen peroxide to propylene oxide process, based on a research institute laboratory and a pilot plant studies, which based on titanium-silicon catalyst of direct epoxidation to propylene oxide, and its equipment was optimized, its economy was studied by systematic methods, and obtained the following results:(1) Titanium-silicon molecular sieve catalyst DH-1 used in this paper was made by new synthetic method, the cost is low, the method have good repeatability, the catalyst has been completed by 10 times and 250 times lab enlargement preparation, then 5000-fold pilot preparation and 25,000-fold industrialized production; one-batch production is from 14 g, 140 g, 3.5kg, to 70 kg, the last one-batch production will reach more than 350 kg, and catalysts application performance have been fully verified in the series of enlargement products. synthesis processes, equipment selection, DH-1 catalyst filtering and washing, drying, calcination, molding, quality assessment, application effect, production status and regeneration by 25,000 times enlargement, progress and others are discussed respectively in this paper.(2) The 10 KTA HPPO plant was designed and improved based on 1.5KTA pilot plant,with a great improvement in terms of energy saving and environmental protection. Through the research in different stages of the reaction conditions in the 10 KTA reactor, the different stages of the reaction conditions was determined finally; through the distillation system adjustment and transformation, the quality of product and stability of plant were greatly improved.(3) Through the comprehensive utilization of heat in the system, so that means only the methanol-ton tower needs fresh steam, heat used in all other systems are all from the system remaining heat. steam consumption from the pilot plant 12 t/t PO, decreased to 7.3 t/t PO.(4) In this paper, the chemical process simulation software Aspen Plus was used to simulate PO refined unit, in order to provide reference for improving HPPO plant energy utilization levels and for optimizing design of the 10 KTA plant..(5) The article also raised a point that in the process of propylene epoxidation reaction, unreacted propylene, discharged from the top of the reactor, should be recycled urgently. So propylene circulatory system was designed preliminary.