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[Chemical Knowledge]：Production process and preparation method of epichlorohydrin

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Epichlorohydrin is an important chemical raw material, which is widely used in organic synthesis and polymer chemistry. This article will introduce the production process and preparation method of epichlorohydrin.

1. The production process
of epichlorohydrin The production process of
epichlorohydrin mainly includes the following steps:

1) Raw material preparation: The raw materials for the preparation of epichlorohydrin are propylene, chlorine, hydrogen peroxide, Sulfuric acid, etc. Among them, propylene is the main raw material for preparing epichlorohydrin, chlorine is used for chlorinating propylene, hydrogen peroxide is used for oxidizing chlorinated propylene, and sulfuric acid is used for separating epichlorohydrin.

2) Chlorinated propylene: propylene and chlorine are reacted under the action of a catalyst to generate chlorinated propylene. The reaction conditions are generally a temperature of 30 to 50 ° C. and a pressure of 1.0 to 1.5MPa.

3) oxidation of chlorinated propylene: chlorinated propylene and hydrogen peroxide are reacted under the action of a catalyst to generate epichlorohydrin. The reaction conditions are generally a temperature of 50 to 60 ° C. and a pressure of 1.0 to 1.5MPa.

4) Separation of epichlorohydrin: The epichlorohydrin is separated from the mixture by extraction with sulfuric acid. Subsequently, pure epichlorohydrin is extracted by distillation, filtration, etc.

2. Preparation method of epichlorohydrin There are many preparation methods of

epichlorohydrin. The following will introduce two common methods:

1) Chlorinated propylene-hydrogen peroxide method

Chlorinated propylene-hydrogen peroxide method is currently the most widely used epichlorohydrin preparation method. The main steps of the method are the same as the chlorinated propylene and oxychlorinated propylene in the above process, and the specific reaction equation is:

C3H6 Cl2 → C3H5Cl

C3H5Cl H2O2 → C3H5ClO H2O

2) Chlorothermal method

Chlorothermal method is a new type of epichlorohydrin preparation method. The main steps of the method are as follows:

(1) chlorine gas is introduced into the organic solvent at a constant constant flow rate to generate chlorides. The organic solvent may be benzene, toluene or the like.

(2) The chloro compound is reacted with an excess of an oxidizing agent to produce epichlorohydrin. In the reaction, the oxidizing agent may be chromium trioxide, sodium perchlorate, etc.

C3H5Cl NaClO → C3H5ClO NaCl

or more are two common methods for the preparation of epichlorohydrin, and other methods include sodium hydroxide method and selective oxidation method.

In summary, epichlorohydrin is an important chemical raw material, and there are many production processes and preparation methods. In actual production, it is necessary to choose the appropriate method according to different needs to ensure product quality and production efficiency.