Continuous synthesis process of epoxy chloropropane by hydrogen peroxide method

Abstract

The invention provides a continuous synthesis process of epoxy chloropropane by hydrogen peroxide method. The continuous synthesis process comprises the following steps of adding hydrogen peroxide, methanol, chloropropene and a catalyst into a reactor for epoxidation reaction, wherein the reactor is a ring reactor, and the catalyst is pre-loaded into the ring reactor; enabling the chloropropene and the methanol to form a chloropropene and methanol mixed solution in a mixing tank, pumping chloropropene and methanol mixed solution into the ring reactor by a metering pump A, and pumping hydrogenperoxide into the ring reactor by a metering pump B. The synthesis process provided by the invention has the advantages of low methanol consumption, long service life of the catalyst, simple process device, realization of continuous operation, and realization of stable hydrogen peroxide conversion rate and high epichlorohydrin selectivity in a long-term continuous operation process.

Description

technical field [0001] The invention belongs to the field of catalytic synthesis, and relates to a method for synthesizing epichlorohydrin. More specifically, the invention relates to a continuous synthesis process of epichlorohydrin by hydrogen peroxide method. Background technique [0002] Epichlorohydrin is an important organic chemical raw material and fine chemical product. Because its molecule contains active epoxy groups and chlorine atoms, its chemical properties are quite active, and it has become an important basic organic chemical raw material and intermediate. Widely used in the synthesis of epoxy resin, glycerin, alcohol rubber, medicine, pesticides, surfactants, glass fiber reinforced plastics, ion exchange resins, coatings and plasticizers. [0003] At present, research at home and abroad is mainly focused on the process of preparing epichlorohydrin by direct epoxidation of chloropropene using hydrogen peroxide as the oxygen source. small. CN101124044A discl...

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Problems solved by technology

CN101124044A discloses a production process for epichlorohydrin, using titanium-silicon molecular sieve as a catalyst, methanol as a solvent, and direct epoxidation of chloropropene to prepare epichlorohydrin. Titanium-silicon molecular sieves are packed into a fixed bed, and chloropropene, methanol It is configured into a homogeneous phase with hydrogen peroxide. At a certain temperature, it is pumped into a fixed bed for reaction. This reaction requires the feed to be configured into a homogeneous phase, so a large amount of methanol is required, and the recovery of methanol consumes a lot of energy

The use time of the catalyst in this process is short, the catalyst needs to be regenerated for each reaction, the process is complex, and the energy consumption is high

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