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Method for preparing chloropropene by initiating high-temperature chlorination of propylene by free agent

A high-temperature chlorination and chloropropene technology, applied in chemical instruments and methods, preparation of halogenated hydrocarbons, organic chemistry, etc., can solve the problems of many side reaction products, complicated production process, and low purity

Inactive Publication Date: 2018-08-31
SHANDONG HIYI CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In related technologies, high-temperature chlorination, propylene oxychlorination, and allyl alcohol oxidation are generally used to produce chloropropene, which has defects such as complex production process, low yield, low purity, and many side reaction products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Dry the propylene raw material (purity is more than 98% by mass fraction) and preheat to 280°C-320°C; add the preheated propylene raw material, low-temperature chlorine gas and free agent into the mixer and mix at the same time, the mole of propylene raw material and low-temperature chlorine gas The ratio is 4.5:1; the mixed material is passed into the reactor, and the reaction temperature is controlled to be stable at about 500°C; the reaction product is passed into the heat exchanger, and quenched and cooled to about 50°C; the reaction after quenching is formed The product is passed into the pre-fractionation tower, and the temperature of the pre-fractionation tower is controlled by liquid reflux at about -40°C; the chlorinated hydrocarbons in the reaction product are separated from the bottom of the pre-fractionation tower by cooling, and the excess propylene in the reaction product 1. Hydrogen chloride gas is passed into the propylene separation device from the top o...

Embodiment 2

[0051] Dry the propylene raw material (purity is more than 98% by mass fraction) and preheat to 280°C-320°C; add the preheated propylene raw material, low-temperature chlorine gas and free agent into the mixer and mix at the same time, the mole of propylene raw material and low-temperature chlorine gas The ratio is 4.5:1; the mixed material is passed into the reactor, and the reaction temperature is controlled to be stable at about 480°C; the reaction product is passed into the heat exchanger, and quenched and cooled to about 45°C; the reaction after quenching and cooling is formed The product is passed into the pre-fractionation tower, and the pre-fractionation tower uses liquid reflux to control the temperature at about -35°C; the chlorinated hydrocarbons in the reaction product are separated from the bottom of the pre-fractionation tower by cooling, and the excess propylene in the reaction product 1. Hydrogen chloride gas is passed into the propylene separation device from t...

Embodiment 3

[0053] Dry the propylene raw material (purity is more than 98% by mass fraction) and preheat to 280°C-320°C; add the preheated propylene raw material, low-temperature chlorine gas and free agent into the mixer and mix at the same time, the mole of propylene raw material and low-temperature chlorine gas The ratio is 4.5:1; the mixed material is passed into the reactor, and the reaction temperature is controlled to be stable at about 520°C; the reaction product is passed into the heat exchanger, and quenched and cooled to about 55°C; the reaction after quenching and cooling is formed The product is passed into the pre-fractionation tower, and the pre-fractionation tower uses liquid reflux to control the temperature at about -45°C; the chlorinated hydrocarbons in the reaction product are separated from the bottom of the pre-fractionation tower by cooling, and the excess propylene in the reaction product 1. Hydrogen chloride gas is passed into the propylene separation device from t...

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Abstract

The invention provides a method for preparing chloropropene by initiating high-temperature chlorination of propylene by a free agent. The method comprises the following steps: drying a propylene raw material and preheating to first preset temperature; adding the preheated propylene raw material, low-temperature chlorine and the free agent into a mixer simultaneously to mix; introducing the mixed materials into a reactor and controlling the reaction temperature to be stabilized at second preset temperature; introducing a reaction product into a heat exchanger and performing shock cooling to third preset temperature; introducing the reaction product after shock cooling into a prefrationation tower and controlling the temperature to be fourth preset temperature through liquid reflux by the prefrationation tower; and cooling and separating out chlorinated hydrocarbon substances in the reaction production from the bottom of the prefrationation tower, and introducing the excessive propyleneand hydrogen chloride gas in the reaction product into a propylene separation device from the top of the prefrationation tower. By the technical scheme, the reaction focuses on substitution reaction,so that the yield and the conversion rate of chloropropene are increased and generation of side reaction products is reduced while raw materials and energy are recycled completely.

Description

technical field [0001] The invention relates to the technical field of chemical product preparation, in particular to a method for preparing allyl chloride by high-temperature chlorination of propylene initiated by a free agent. Background technique [0002] Allyl chloride is a colorless flammable liquid with corrosive and pungent smell, slightly soluble in water, miscible with ethanol, chloroform, ether and petroleum ether, and can be used as an intermediate in the production of epichlorohydrin, propenyl alcohol, glycerin, etc. It is used as a solvent for special reactions. It is also a raw material for pesticides, medicines, spices, and coatings. It is used in organic synthesis and pharmaceutical industries. It is also a raw material for organic synthesis. The intermediate N,N-dimethylacrylamine of carbad and the intermediate of pyrethroid acryl alcohol ketone and allyl chloride are also important raw materials for medicine, synthetic resin, paint, spices and so on. Allyl...

Claims

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Application Information

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IPC IPC(8): C07C17/10C07C21/067
CPCC07C17/10C07C21/067
Inventor 宋朋斌薄纯金张昭利张建肖
Owner SHANDONG HIYI CHEM TECH
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