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Method for continuous production of epichlorohydrin

A technology of epichlorohydrin and chloropropene, which is applied in organic chemistry and other fields, can solve the problems of easy decomposition of peroxide when heated, explosion hazard, low utilization rate of raw materials, etc.

Active Publication Date: 2018-07-17
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 continuous production of epichlorohydrin is provided.

Method used

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  • Method for continuous production of epichlorohydrin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] use figure 1 As shown in the flow process, 2 reactors are used in series, and the fresh chloropropene with a flow rate of 1.7 kg / h is mixed with a homogeneous molybdenum-based catalyst with a flow rate of 3.3 g / h, and enters from the top of the reactor 1. From reaction 2 kettle discharge V2 ', split out 30% and flow be after the ethylbenzene solution that contains 50% ethylbenzene hydroperoxide mixes at 2 kilograms / hour, be divided into 2 equal parts, from reactor 1 and reactor 2 respectively Top entry to enter.

[0043] The weight ratio of molybdenum to ethylbenzene hydroperoxide is 0.00005, epichlorohydrin: ethylbenzene hydroperoxide=3 (molar ratio).

[0044] 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 50%.

[0045] 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%.

[...

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 2.5 kg / h is mixed with a homogeneous molybdenum-based catalyst with a flow rate of 6.7 g / h, and enters the reactor from the top of the reactor 1. Discharge V from the last reactor 4 After splitting out 40% with flow rate and containing the cumene solution of 50% cumene hydroperoxide at 2 kilograms / hour, be divided into 4 equal parts, enter from the top inlet of reactor 1 to reactor 4 respectively.

[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 ...

Embodiment 3

[0056] use figure 1 Shown flow process, 5 reactors are used in series, and flow rate is that the fresh allyl chloride of 3.92 kg / hour is mixed with the homogeneous molybdenum-based catalyst that flow rate is 20 g / hour, enters from reactor 1 top. Discharge V from the last reactor 5 After splitting out 50% with flow rate and containing the ethylbenzene solution of 50% ethylbenzene hydroperoxide in ', be divided into 5 equal parts, enter from the top inlet of reactor 1 to reactor 5 respectively.

[0057] The weight ratio of molybdenum to ethylbenzene hydroperoxide is 0.0003, and allyl chloride: ethylbenzene hydroperoxide=7 (molar ratio).

[0058] The reaction temperature of the reactor 1 is 30° C., the reaction pressure is 0.7 MPa, and the conversion rate of ethylbenzene hydroperoxide is 35%.

[0059] The reaction temperature of the reactor 2 is 50° C., the reaction pressure is 0.7 MPa, and the conversion rate of ethylbenzene hydroperoxide is 55%.

[0060] The reaction tempera...

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Abstract

The present invention relates to a continuous epichlorohydrin production 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; the method comprises that: a) a reaction apparatus comprising n reaction kettles connected in series is provided; b) allyl chloride and a catalyst are supplied to the inlet of the first reaction kettle; c) an organic peroxide is divided into n parts, and the n parts are respectively supplied to the inlets of the n reaction kettles; d) except the last reaction kettle, the streams outflowing from the outlets of each reaction kettle enter the inlets of the next reaction kettles, and stream Vn is obtained at the outlet of the last reaction kettle; and e) one part stream Vn' is shunted from the stream Vn, the stream Vn' circulates to the inlet of the first reaction kettle, and the remaining part Vn" is subjected to refining separation so as to obtain the product epichlorohydrin; and the method can be used for the industrial production of the epichlorohydrin.

Description

technical field [0001] The invention relates to a method for continuously producing 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...

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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