Parallel reaction method for preparation of epoxypropane through HPPO process

Abstract

The invention provides a parallel reaction method for preparation of epoxypropane through a HPPO process. The method comprises the following steps: step 1, fully mixing fresh hydrogen peroxide, excess propylene and a circulating methanol solvent in a static mixer so as to obtain a mixed solution; and step 2, averagely distributing the mixed solution to a first multitubular reactor and a second multitubular reactor which are totally identical and connected in parallel, allowing propylene and hydrogen peroxide in the mixed solution to produce epoxypropane and the like under the action of a titanium-silicon zeolite fixed bed catalyst in row tubes of the first multitubular reactor and the second multitubular reactor, and subjecting a formed gas-liquid mixed phase to subsequent separation and purification after the gas-liquid mixed phase leaves the reactors. According to the invention, the first multitubular reactor and the second multitubular reactor in parallel connection are used for synthesis of epoxypropane, so during large-scale industrial production of epoxypropane, the internal diameter of each single reactor is reduced and difficulty in manufacturing of the reactors is alleviated while other equipment is not influenced.

Description

technical field [0001] The invention relates to a chemical product reaction process method, in particular to a parallel reaction method for preparing propylene oxide by HPPO (direct oxidation method). Background technique [0002] Propylene oxide is an important organic chemical raw material, second only to polypropylene and acrylonitrile in the derivatives of propylene, ranking third. Propylene oxide has extremely active chemical properties and is widely used. Propylene oxide is used as raw material to produce polyether polyol and then polyurethane is its largest application; secondly, it can be used to produce polyurethane elastomer and widely used surfactants such as propylene glycol and propylene glycol ether; it can also be used to produce oil field demulsifier and pesticide emulsifier And wetting agents, etc., are important raw materials for fine chemical products. [0003] In the industry, there are three production methods of propylene oxide: chlorohydrin method, c...

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Problems solved by technology

[0005] In order to ensure a high yield of propylene oxide and suppress the occurrence of side reactions, in addition to selecting a highly selective catalyst, an excess of propylene and a large amount of methanol solvent should also be provided. For the tubular reactor, the larger reactor inner diameter and When there are more reaction tubes, it will affect the uniform passage of the reactants through each reactor tube, which will affect the yield of propylene oxide and the utilization rate of the catalyst. In addition, the inner diameter of the reactor exceeds a certain size, and there are certain difficulties for equipment manufacturers.

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