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Epichlorohydrin preparation method

A technology of epichlorohydrin and chloropropene, applied in organic chemistry and other directions, can solve the problems of low utilization rate of raw materials, easy decomposition of peroxides when heated, danger of explosion, etc., to achieve fast heat removal, easy temperature control, and prevention of reaction runaway Effect

Active Publication Date: 2016-01-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that in the prior art, peroxides are easily decomposed by heating, resulting in low utilization rate of raw materials and the risk of explosion. A new method for preparing epichlorohydrin is provided.

Method used

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  • Epichlorohydrin preparation method

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Experimental program
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Effect test

Embodiment 1

[0038] use figure 1 As shown in the flow process, 2 reactors are used in series, and the fresh chloropropene with a flow rate of 0.5 kg / h is mixed with the circulating chloropropene of 1.2 kg / h and the homogeneous molybdenum-based catalyst with a flow rate of 3.3 g / h. Enter. The flow rate is 2 kg / h. After the ethylbenzene solution containing 50% ethylbenzene hydroperoxide is mixed with 1 kg / h circulating ethylbenzene, it enters from the top inlet of the reactor 1.

[0039] The weight ratio of molybdenum to ethylbenzene hydroperoxide is 0.00005, and allyl chloride: ethylbenzene hydroperoxide=3 (molar ratio).

[0040] The reaction temperature of the reactor 1 is 30° C., the reaction pressure is 0.1 MPa, and the conversion rate of ethylbenzene hydroperoxide is 40%.

[0041] The reaction temperature of the reactor 2 is 50° C., the reaction pressure is 0.1 MPa, and the conversion rate of ethylbenzene hydroperoxide is 100%.

[0042] The stream containing epichlorohydrin, chloropr...

Embodiment 2

[0048] use figure 1 As shown in the flow process, 4 reactors are used in series, and the fresh chloropropene with a flow rate of 0.5 kg / h is mixed with the circulating chloropropene of 2 kg / h and the homogeneous molybdenum-based catalyst with a flow rate of 6.7 g / h. Enter. The flow rate is 2 kg / hour. After the cumene solution containing 50% cumene hydroperoxide is mixed with 1 kg / hour circulating cumene, it enters from the top inlet of the reactor 1.

[0049] The weight ratio of molybdenum and cumene hydroperoxide is 0.0001, and allyl chloride: cumene hydroperoxide=5 (mol ratio).

[0050] The reaction temperature of the reactor 1 is 30° C., the reaction pressure is 0.3 MPa, and the conversion rate of cumene hydroperoxide is 30%.

[0051] The reaction temperature of the reactor 2 is 40° C., the reaction pressure is 0.3 MPa, and the conversion rate of cumene hydroperoxide is 60%.

[0052] The reaction temperature of the reactor 3 is 50° C., the reaction pressure is 0.3 MPa, a...

Embodiment 3

[0060] use figure 1 As shown in the flow process, 5 reactors are used in series, and the fresh chloropropene with a flow rate of 0.5 kg / h is mixed with the circulating chloropropene of 3 kg / h and the homogeneous molybdenum-based catalyst with a flow rate of 20 g / h. Enter. The flow rate is 2 kg / h. After the ethylbenzene solution containing 50% ethylbenzene hydroperoxide is mixed with 1 kg / h circulating ethylbenzene, it enters from the top inlet of the reactor.

[0061] The weight ratio of molybdenum to ethylbenzene hydroperoxide is 0.0003, and allyl chloride: ethylbenzene hydroperoxide=7 (molar ratio).

[0062] The reaction temperature of the reactor 1 is 30° C., the reaction pressure is 0.5 MPa, and the conversion rate of ethylbenzene hydroperoxide is 35%.

[0063] The reaction temperature of the reactor 2 is 50° C., the reaction pressure is 0.5 MPa, and the conversion rate of ethylbenzene hydroperoxide is 55%.

[0064] The reaction temperature of the reactor 3 is 90° C., t...

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Abstract

The present invention relates to an epichlorohydrin preparation method. A purpose of the present invention is mainly to solve the problems of low raw material utilization rate and explosion risk caused by the easy peroxide decomposition due to heating in the prior art. According to the present invention, in the presence of a homogeneous molybdenum-based catalyst, an organic peroxide and allyl chloride are used to prepare the epichlorohydrin; and the method comprises that: a) a reaction apparatus comprising n reaction kettles connected in series is provided, wherein n is an integer of more than or equal to 2; b) a stream A containing fresh allyl chloride, a stream B containing an organic peroxide and a stream C containing a homogeneous molybdenum-based catalyst are supplied to the inlet of the first reaction kettle; and c) except the last reaction kettle, the streams outflowing from the outlets of each reaction kettle enter the inlets of the next reaction kettles, and the stream Vn containing epichlorohydrin is obtained from the outlet of the last reaction kettle. The method of the present invention can be used in theindustrial epichlorohydrin production.

Description

technical field [0001] The invention relates to a method for preparing epichlorohydrin. Background technique [0002] Epichlorohydrin is also known as epichlorohydrin, and its chemical name is 3-chloro-l,2-propylene oxide. It is an important organic chemical raw material and synthetic intermediate. Among epoxy compounds, the output of epichlorohydrin is second only to ethylene oxide and propylene oxide, ranking third. Epichlorohydrin can be used as a solvent for cellulose esters, resins and cellulose ethers, and is also used in the production of surfactants, medicines, pesticides, coatings, adhesives, ion exchange resins, plasticizers, glycerin derivatives and glycidol derivatives The raw material of things. Various epoxy resins prepared by epichlorohydrin and bisphenol A have the characteristics of strong adhesion, small shrinkage, chemical corrosion resistance, and good stability, and are widely used as coatings, adhesives, reinforcing materials, and casting materials. ...

Claims

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Application Information

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IPC IPC(8): C07D303/08C07D301/19
Inventor 杨洪云高焕新金国杰黄政丁琳康陈军
Owner CHINA PETROLEUM & CHEM CORP
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