Method for preparing epoxy chloropropane
A technology of epichlorohydrin and chloropropene, applied in organic chemistry and other directions, can solve the problems of high energy consumption, produce many by-products, pollute the environment, etc., and achieve the effect of low energy consumption and low by-products
Pending Publication Date: 2020-08-25
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology
[0003] However, the chlorohydrin method uses highly toxic chlorine gas as a raw material, which has low safety; the oxidation by-product hydrochloric acid will cause low atom utilization in the chlorohydrinization reaction, resulting in a low yield of epichlorohydrin; The reaction produces more by-products; the direct addition reaction with chloropropene will generate low-value trichloropropane. In order to control the concentration of the target product, it is necessary to add a large amount of water to dilute the chlorine concentration in the reaction system, which not only makes the saponification and separation process consume more energy High, and about one ton of epichlorohydrin produces refractory waste water and waste residue, polluting the environment
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Embodiment 1
[0030] The embodiment of the present invention provides a kind of method for preparing epichlorohydrin, specifically as follows:
[0031] Mix methanol, 30% hydrogen peroxide and allyl chloride, the molar ratio of allyl chloride to hydrogen peroxide (calculated as pure hydrogen peroxide) is 3:1, and feed it to a fixed-bed catalytic reactor (wherein the catalyst is a titanium-silicon molecular sieve TS- 1), the feed space velocity is 1h based on hydrogen peroxide -1 , will account for methyl alcohol, hydrogen peroxide and allyl chloride 0.05% surfactant (loaded on the carrier Siben-60 and Tween-80 simultaneously, Siben-60 pure substance quality is 0.01%, Tween-80 pure substance The mass is 0.01%) is also fed to the fixed-bed catalytic reactor, and allyl chloride and hydrogen peroxide are reacted in the fixed-bed catalytic reactor.
[0032] The products generated in the fixed-bed catalytic reactor include epichlorohydrin, solvent, residual chloropropene and residual hydrogen per...
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Abstract
The invention provides a method for preparing epoxy chloropropane, which comprises the following steps: using chloropropene as a raw material and hydrogen peroxide as an oxidant, adding a solvent anda surfactant, and reacting in a fixed bed catalytic reactor. The method provided by the invention has the advantages that the catalytic effect and the promoting effect of the solvent and the surfactant are used; hydrogen peroxide and chloropropene are subjected to one-step reaction in the fixed bed catalytic reactor to prepare epoxy chloropropane; the catalyst is easy to separate, green and safe production of epoxy chloropropane with high efficiency, low energy consumption, low toxicity, low by-products and no pollution can be realized, and the method can completely replace a traditional chlorohydrin method to produce epoxy chloropropane.
Description
technical field [0001] The invention relates to the field of preparation of organic chemical intermediates, in particular to a method for preparing epichlorohydrin. Background technique [0002] Epichlorohydrin is an important organic chemical intermediate, mainly used in the production of epoxy resin. At present, the industrial preparation of epichlorohydrin mainly adopts the chlorohydrin method, and dichloropropanol is prepared by chlorohydrinization reaction with allyl chloride, chlorine gas and water, and then further saponified to obtain epichlorohydrin. In the chloroalcoholation reaction, chlorine gas is used as the oxidant and chlorine source, and water provides hydroxyl groups. The reaction mechanism is that the hypochlorous acid oxidized the double bond of chloropropene generated by the reaction of chlorine gas and water, and the electrons on the double bond are transferred to the chlorine atom. At the same time, the chlorine atom Addition to the double bond, follo...
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IPC IPC(8): C07D303/08C07D301/12
CPCC07D303/08C07D301/12
Inventor 林民张振涛杨俊玲张钰张化福
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI