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Method for preparing 1-chloropropene by catalytic dehydrochlorination of 1, 2-dichloropropane

A dichloropropane and dehydrochlorination technology, which is applied in the direction of dehydrohalogenation preparation, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problems of unmentioned proportion and rapid decline of catalyst activity, etc.

Active Publication Date: 2018-03-06
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhao 54-22302 discloses a method for preparing 1-chloropropene from 1,2-dichloropropane. The method uses a bismuth-containing heteropolyacid as a catalyst, and the selectivity of 1-chloropropene is 90.1%. Mention the ratio of cis-, trans-1-chloropropene, and the catalyst activity decreases rapidly

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0014] 7.26g of FeCl 3 ·6H 2 O, 0.15g of H 2 PtCl 6 , 0.82g of CeCl 3 ·6H 2 O was configured as an aqueous solution, and then loaded on 50g γ-Al 2 o 3 above, dry at 120°C for 2 hours in a nitrogen atmosphere, and bake at 500°C for 4 hours in a nitrogen atmosphere, then take 10ml of catalyst and put it into a reaction tube, and react at 350°C with a nitrogen space velocity of 1000 h -1 , The raw material feed rate is 1.5ml / min. The reaction product was detected by gas chromatography, the conversion rate was 88.6%, and the selectivity was 99.6%.

Embodiment 2

[0016] 7.26g of FeCl 3 ·6H 2 O, 0.15g of H 2 PtCl 6 , 0.94g LaCl 3 ·7H 2 O was configured as an aqueous solution, and then loaded on 50g γ-Al 2 o 3 above, dry at 120°C for 2 hours in a nitrogen atmosphere, and bake at 500°C for 4 hours in a nitrogen atmosphere, then take 10ml of catalyst and put it into a reaction tube, and react at 360°C with a nitrogen space velocity of 1000 h -1 , The raw material feed rate is 1.5ml / min. The reaction product was detected by gas chromatography, the conversion rate was 89.5%, and the selectivity was 99.3%.

Embodiment 3

[0018] 8.24g of FeCl 3 ·6H 2 O, 0.08g of PdCl 2 , 0.82g of CeCl 3 ·6H 2 O was configured as an aqueous solution, and then loaded on 50g γ-Al 2 o 3 above, dry at 120°C for 2 hours in a nitrogen atmosphere, and bake at 500°C for 4 hours in a nitrogen atmosphere, then take 10ml of catalyst and put it into a reaction tube, and react at 350°C with a nitrogen space velocity of 1200 h -1 , The raw material feed rate is 1.5ml / min. The reaction product was detected by gas chromatography, the conversion rate was 87.0%, and the selectivity was 99.5%.

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Abstract

The invention discloses a method for preparing 1-chloropropene by catalytic dehydrochlorination of 1, 2-dichloropropane. The catalyst comprises an active ingredient and a carrier. The active ingredient is M1-M2-M3, M1 represents a chloride of Fe or Co, M2 represents a compound of Pt or Pd, and M3 represents a chloride of Ce or La. The carrier is gamma-Al2O3, molecular sieve or activated carbon. The method comprises putting the catalyst into a fixed-bed reactor, feeding nitrogen gas into the fixed-bed reactor, heating the nitrogen gas to 300 DEG C, and feeding 1, 2-dichloropropane into the reactor for a reaction at 300-400 DEG C, wherein a nitrogen airspeed is maintained at 500-2000h<-1>. A conversion rate of the raw material 1, 2-dichloropropane is in a range of 85.7% to 90.6% and the selectivity of the 1-chloropropene is 99.2% to 99.6%. A ratio of trans-1-chloropropene to cis-1-chloropropene is 3:1.

Description

technical field [0001] The invention relates to a method for preparing 1-chloropropene by catalytic dehydrochlorination of 1,2-dichloropropane. Background technique [0002] 1-chloropropene has two isomers, cis- and trans-, cis-1-chloropropene: liquid at room temperature, freezing point -134.8°C, boiling point 32.8°C, refractive index 1.4054; trans -1-chloropropene: liquid at room temperature, freezing point -99°C, boiling point 37.4°C, refractive index 1.4048 or 1.4054, trans-1-chloropropene is more expensive than cis-1-chloropropene. 1-Chloropropene is an important intermediate in organic synthesis, and can also be used as a raw material for the preparation of glycerin and propenyl alcohol. At present, the market price of 1-chloropropene is relatively high, and the main source is the by-product of the high-temperature chlorination process of propylene, and there is no method for large-scale preparation of 1-chloropropene. 1,2-Dichloropropane is the main by-product in the...

Claims

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Application Information

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IPC IPC(8): C07C17/25C07C21/04B01J23/89B01J29/072
CPCB01J23/894B01J29/072B01J2229/18B01J2523/00C07C17/25C07C21/04B01J2523/3712B01J2523/842B01J2523/828B01J2523/31B01J2523/3706B01J2523/824B01J2523/845
Inventor 熊绪茂胡斌慕新元宋承立马占伟
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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