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Process for preparing epichlorohydrin

A technology of epichlorohydrin and chloropropene, applied in the direction of organic chemistry, etc., can solve the problems of low utilization rate of raw materials, easy decomposition of peroxide when heated, and explosion hazard, etc., achieve fast heat removal, easy temperature control, and prevent reaction from getting out of control Effect

Active Publication Date: 2018-04-06
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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  • Process for preparing epichlorohydrin

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Experimental program
Comparison scheme
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 invention relates to a method for preparing epichlorohydrin, which mainly solves the problems in the prior art that peroxides are easily decomposed when heated, resulting in low utilization rate of raw materials and risk of explosion. The present invention prepares epichlorohydrin by organic peroxide and chloropropene in the presence of a homogeneous molybdenum-based catalyst; the method comprises the following steps: a) providing a reaction device comprising n series reaction tanks; wherein, n is 2 The above integer; b) the stream A containing fresh chloropropene, the stream B containing the organic peroxide and the stream C containing the homogeneous molybdenum-based catalyst are supplied to the first reactor inlet; c) except the last reactor, from The stream flowing out of each reactor outlet enters the next reactor inlet, so that a stream Vn containing epichlorohydrin is obtained at the last reactor outlet, which can be used in the industrial production of epichlorohydrin.

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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Patent Type & Authority Patents(China)
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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