Production process using chloroacetic acid tail gas to produce epoxy chloropropane

Abstract

The invention provides a production process using chloroacetic acid tail gas to produce epoxy chloropropane. The production process comprises the following process flows: (1), adding glycerine and chloroactic acid mother liquor (5-8% of the glycerine by weight) to a chlorination reaction kettle; (2), mixing the chlorinated liquid of the dichloropropanol with 9-12% of lime emulsion, and then putting the mixture to a reaction tower to perform steam distillation under the pressure of (-)0.04MPa to (-)0.06MPa; (3), removing the moisture of crude epoxy chloropropane generated by the reaction in a pressure-reducing distillation manner, and putting the dehydrated epoxy chloropropane to a rectifying tower to perform rectification under vacuum, and acquiring the product epoxy chloropropane on the top of the rectifying tower. The chloroacetic acid tail gas and the glycerol react, so that the energy is saved, and the investment is a little; the cost advantages are remarkable, the operation conditions of the proposal are gentle, safe and reliable without pollution waste steam; moreover, composite catalyst is adopted in the reaction, and the dear catalyst is not needed.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a production process for producing epichlorohydrin by utilizing chloroacetic acid tail gas. Background technique [0002] Epichlorohydrin is an important organic chemical raw material and fine chemical product. The epoxy resin prepared from it has strong adhesion, corrosion resistance to chemical media, low shrinkage, good chemical stability, and high impact strength. High and excellent dielectric properties. Industrial epichlorohydrin production methods include high-temperature chlorination of propylene based on petroleum raw materials, propylene acetate method and glycerin method, and most of them are propylene routes. The high-temperature chlorination of propylene is a classic method for industrial production of epichlorohydrin. The main raw materials are propylene, chlorine and lime. The process mainly includes: high-temperature chlorination of propylene to produ...

AI Technical Summary

Problems solved by technology

The high-temperature chlorination of propylene is characterized by flexible production process, mature process, and stable operation. The disadvantage is that the raw material chlorine causes serious equipment corrosion, high requirements on the purity of propylene and the material of the reactor, high energy consumption, high chlorine consumption, and many by-products , the product yield is low; the production process produces a large amount of waste water containing calcium chloride and organic chloride, the treatment cost is high, and the coke cleaning cycle is short. In addition, the main raw material propylene required for production comes from petroleum, which is a non-renewable raw material. Under the situation that the world's energy is becoming more and more tense, there is great uncertainty in the supply of raw materials