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Catalyst applied to preparation of vinyl chloride by catalytic cracking of 1,2-dichloroethane as well as preparation method and application of catalyst

A technology of catalytic cracking and dichloroethane, applied in the field of cracking catalysts, can solve the problems of high reaction temperature, easy coking, high energy consumption, etc., and achieve the effects of simple preparation process, lower cracking temperature and short process

Inactive Publication Date: 2015-01-21
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems of high reaction temperature, high energy consumption, easy coking and carbon deposition in the current technology of cracking dichloroethane to produce vinyl chloride, and provide a kind of catalytic cracking of 1,2-dichloroethane to prepare chlorine Ethylene catalyst and its preparation method and application

Method used

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  • Catalyst applied to preparation of vinyl chloride by catalytic cracking of 1,2-dichloroethane as well as preparation method and application of catalyst

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preparation example Construction

[0054] The present invention also provides the preparation method of above-mentioned nitrogen-doped activated carbon catalyst correspondingly, generally comprises the following steps:

[0055] Step (1): Soak the activated carbon to remove impurities and dredge the pores, and then filter, wash, and dry it for later use;

[0056] Preferably, the soaking solution is selected from aqueous solutions of sulfuric acid, nitric acid, phosphoric acid, hydrochloric acid and sodium hydroxide, with a concentration of 0.5-5 mol / L, preferably 1-2.5 mol / L; According to the volume ratio of 1:1.1~1.5; soaking treatment for 1-24 hours. The purpose of this step is to remove impurities in the activated carbon raw material by soaking. Therefore, within the scope that those skilled in the art can understand, any soaking scheme that can achieve the purpose of removing impurities belongs to the scope of protection of the present invention; it is preferable to use centrifugal drying for solid-liquid s...

Embodiment 1

[0072] Preparation of sample 1: Nitrogen-doped coal-based carbon catalyst using ammonia as nitrogen source

[0073] The specific preparation process is as follows: 500g of coal-based carbon is added to 1000ml of 2mol / L hydrochloric acid solution, soaked at room temperature for 12 hours, then centrifuged to dry, washed with deionized water to weak acidity, and dried at 120°C for 10 hours. Take 50g of treated activated carbon and put it into a tube furnace. After raising the temperature to 500°C in a nitrogen atmosphere, feed ammonia and hydrogen at a rate of 50ml / min and 10ml / min at the same time, and stop heating and cooling after 6 hours. to room temperature, and shut off the ammonia and hydrogen to obtain a nitrogen-doped activated carbon catalyst with a total nitrogen doping amount of 1.1wt% on the inner and outer surfaces.

Embodiment 2

[0075] Preparation sample 2: nitrogen-doped coal-based carbon catalyst using polyacrylamide as nitrogen source.

[0076] The specific preparation process is as follows: take 2g of polyacrylamide-300 (analytical pure, molecular weight) and add it into 100g of deionized water, heat and stir at 60°C until completely dissolved. 50 g of the coal-based carbon treated with hydrochloric acid in Example 1 was added thereto, soaked in vacuum at -0.1 MPa for 2 hours, filtered to remove excess solution, and dried in vacuum at 80° C. for 10 hours. Put the dried activated carbon into a tube furnace, and carbonize at 600°C for 10 hours under the protection of nitrogen to obtain a nitrogen-doped coal-based carbon catalyst with polyacrylamide as the nitrogen source, and the nitrogen doping amount is between 0.1-10%. between.

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Abstract

The invention relates to a nitrogen-doped active carbon catalyst applied to preparation of vinyl chloride by catalytic cracking of 1,2-dichloroethane and in particular relates to active carbon, wherein the inner surface and the outer surface of the active carbon are doped with nitrogen; the doping content of nitrogen is 0.1-10wt%; furthermore, meal is loaded on the nitrogen-doped active carbon catalyst and exists in the form of a metal compound; the loading content of the metal compound is 0.1-10wt%. According to the catalyst, the preparation method is simple, the process is short, materials are easily available, and the cost is relatively low; the nitrogen doped in the active carbon has a small possibility of losing and inactivating; the nitrogen is doped in the nitrogen-doped active carbon catalyst loaded with the metal compound, so that the dispersion of the metal component on the active carbon can be effectively improved; the catalytic activity is improved; the cracking temperature of dichloroethane can be greatly reduced under the catalytic action of the catalyst prepared by the method.

Description

technical field [0001] The invention relates to a catalyst for preparing vinyl chloride by catalytic cracking of 1,2-dichloroethane, a preparation method and application thereof, and belongs to the field of cracking catalysts. Background technique [0002] Polyvinyl chloride (PVC) is the second largest general-purpose resin in the world, and vinyl chloride (VCM) is an important monomer for the synthesis of PVC. There are two main industrial production routes for the production of vinyl chloride: the calcium carbide method route and the ethylene method route. In the calcium carbide method, vinyl chloride is produced by the hydrochlorination of acetylene catalyzed by mercury chloride; in the ethylene process, vinyl chloride is produced by cracking 1,2-dichloroethane. [0003] The global mercury ban treaty "Water Poison Convention" strictly restricts and prohibits the use of mercury catalysts, which greatly restricts the production of vinyl chloride by the calcium carbide meth...

Claims

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Application Information

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IPC IPC(8): B01J27/24C07C21/06C07C17/25
Inventor 姜标
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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