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Catalyst with high activity for producing chloro olefin using chloralkane gas phase catalyzing dehydrochlorination and the preparing method

A high-activity catalyst, a technology for dehydrochlorination, which is applied in the preparation of dehydrohalogenation and other directions, can solve the problems of only 87% conversion rate, low catalyst activity, difficulty in recycling and use, etc., and achieves low cost, high stability and simple preparation method. Effect

Inactive Publication Date: 2007-09-12
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are obvious deficiencies in the production of chlorinated olefins by saponification: a large amount of alkali is consumed in the production process; the hydrogen chloride removed from chlorinated alkanes reacts with alkali to produce a large amount of saponification waste liquid containing chlorinated hydrocarbons and chlorides, which is difficult to recycle. There are serious three waste discharge problems
The activity of the catalyst is still not high, and the conversion rate of 1,1,2,2-tetrachloroethane is only 87% when the reaction temperature is 200°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Catalyst preparation: 80 g of coal-based granular activated carbon (particle size 2 mm × 5 mm, BET specific surface area 650 m 2 / g) Calcined in nitrogen at 600°C for two hours, then cooled to 50-80°C. 20g anhydrous Na 2 SO 4 Dissolve in 50mL of distilled water. After the dissolution is complete, add the above-mentioned activated carbon into the solution, and continuously stir and impregnate for 7h. Then it was dried in air at 120°C for 6h and calcined in nitrogen at 250°C for 2h. The prepared catalyst contained 20% Na 2 SO 4 , and the rest is activated carbon.

[0017] 40 g of the prepared catalyst was packed into the middle of a 50 cm long tubular reactor made of stainless steel (50 cm × 1.8 cm), the temperature of the reactor was gradually raised to the reaction temperature, and nitrogen was introduced at a volume flow rate of 50 mL min -1 . After 1h, when the temperature was constant, stop feeding nitrogen, and feed. The raw material is industrial grade 1,1,...

Embodiment 2

[0019] Catalyst preparation: 80g of coal-based granular activated carbon (particle size 2mm × 5mm, BET specific surface area 720m 2 / g) Calcined at 600°C for two hours in nitrogen, then cooled to 50-80°C. 20g anhydrous Na 2 SO 4 Dissolve in 50mL of distilled water. After the dissolution is complete, add the above-mentioned activated carbon into the solution, and continuously stir and impregnate for 7h. Then it was dried in air at 120°C for 6h and calcined in nitrogen at 250°C for 2h. The prepared catalyst contained 20% Na 2 SO 4 , and the rest is activated carbon.

[0020] The prepared catalyst was loaded into a tubular reactor, using the process conditions, equipment and components and weight percentages of the raw material chlorinated hydrocarbon mixture in Example 1, wherein the reaction temperature was 200°C. After analysis, the conversion rate of 1,1,2,2-tetrachloroethane was 96.4%, and the selectivity of 1,1,2-trichloroethylene was 98.5%.

Embodiment 3

[0022] Catalyst preparation: 80g plant activated carbon (coconut shell charcoal, BET specific surface area 771m 2 / g) and 20g anhydrous Na 2 SO 4 , prepared by the catalyst preparation process in Example 2.

[0023] The prepared catalyst was loaded into a tubular reactor, using the process conditions, equipment and components and weight percentages of the raw material chlorinated hydrocarbon mixture in Example 1. When the reaction temperature was 200°C, the conversion rate of 1,1,2,2-tetrachloroethane was analyzed to be 97.2%, and the selectivity of 1,1,2-trichloroethylene was 98.1%.

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Abstract

The present invention discloses one kind of high activity catalyst for catalyzing the gaseous reaction of alkane chloride to eliminate hydrogen chloride for preparing olefin chloride and its preparation process. The catalyst has active component of alkali metal sulfate accounting for 5-30 wt% of the catalyst and carrier of assembled or irregular active carbon with specific surface area of 400-2000 sq m / g. The active carbon is first high temperature treated, then soaked in solution of active component alkali metal sulfate and finally dried at 110-140 deg.c for 6 hr. The preparation process is simple, low in cost and suitable for industrial production, and the catalyst has high catalytic activity, high material converting rate and high stability.

Description

technical field [0001] The invention relates to a highly active catalyst for preparing chlorinated alkenes by gas-phase catalytic dehydrochlorination of chlorinated alkanes, and a preparation method of the catalyst. Background technique [0002] Chlorinated olefins are important organic chlorine products, such as 1,1,2-Trichloroethylene is widely used as metal degreasing agent, metal cleaning agent, metal parts processing surface treatment agent, extraction agent, fabric and wool dry cleaning agent; it can also be used in Preparation of pesticides, raw materials for organic synthesis, pharmaceutical raw materials, and HFC-134a as a substitute for CFC-12. Ethylene dichloride is an important solvent and polymer monomer, widely used in plastics, rubber, coatings, food packaging and chemical fibers, etc. It can be used in the film industry, and it is one of the important raw materials in the polymer synthesis industry. With the continuous development of new applications, the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/055C07C21/04C07C17/25
Inventor 赵红坤张道森李嵘嵘唐操苏明莉
Owner YANGZHOU UNIV
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