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Catalyst for preparing vinylidene chloride by trichloroethane gas-phase catalytic cracking and preparation method thereof

A catalytic cracking, trichloroethane technology, applied in physical/chemical process catalysts, dehydrohalogenation preparation, chemical instruments and methods, etc., can solve problems such as unsatisfactory selectivity, achieve difficult surface area carbon deactivation, and prolong life. Effect

Inactive Publication Date: 2010-09-01
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The catalyst provided by the above-mentioned patent has unsatisfactory selectivity

Method used

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  • Catalyst for preparing vinylidene chloride by trichloroethane gas-phase catalytic cracking and preparation method thereof
  • Catalyst for preparing vinylidene chloride by trichloroethane gas-phase catalytic cracking and preparation method thereof
  • Catalyst for preparing vinylidene chloride by trichloroethane gas-phase catalytic cracking and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) cesium nitrate is mixed with the saturated solution under 80 ℃;

[0033] (2) At 90°C, the solution obtained in step (1) was impregnated on the carrier by an equal-volume impregnation method, and dried at 70°C under a vacuum of 0.1 Pa for 28 hours;

[0034] The equal-volume impregnation method is a conventional method for preparing catalysts, such as the method provided in the document "Introduction to Catalyst Engineering" (Wang Shangdi, Sun Junquan. Chemical Industry Press. 2001.55).

[0035] The carrier is a macroporous and mesoporous composite silica-alumina molecular sieve. The document "Synthesis and Characterization of a Hierarchically Ordered Porous Silica Material" (T.Sen.Synthesis and Characterization of Hierarchically Ordered Porous SilicaMaterials[J]Chem.Materials[J]Chem.Materials .2004, 16, 2044-2054) reported method, there is a regular macropore structure with a pore size of 100-500nm inside the molecular sieve, and a mesoporous structure with a pore si...

Embodiment 2

[0042] (1) Potassium nitrate is mixed with the saturated solution under 80 ℃;

[0043] (2) At 95°C, impregnate the solution obtained in step (1) on the carrier by an equal-volume impregnation method, and dry at 50°C for 20 hours under a vacuum of 100 Pa;

[0044] The weight ratio of the solution of the step (1) and the carrier is: the solution of the step (1): carrier=1:? ;

[0045] The carrier is a macroporous and mesoporous composite silica-alumina molecular sieve. The document "Synthesis and Characterization of a Hierarchically Ordered Porous Silica Material" (T.Sen.Synthesis and Characterization of Hierarchically Ordered Porous SilicaMaterials[J]Chem.Materials[J]Chem.Materials .2004, 16, 2044-2054) reported method, there is a regular macropore structure with a pore size of 100-500nm inside the molecular sieve, and a mesoporous structure with a pore size of 3-10nm exists on the macropore wall, and the porosity is greater than 74.05%. , and the molecular sieve with all the...

Embodiment 3

[0053] (1) Rubidium nitrate is prepared into a saturated solution at 80°C;

[0054](2) At 80°C, the solution obtained in step (1) was impregnated on the carrier by an equal-volume impregnation method, and dried at 60°C for 24 hours under a vacuum of 50 Pa;

[0055] The carrier is a macroporous and mesoporous composite silica-alumina molecular sieve. The document "Synthesis and Characterization of a Hierarchically Ordered Porous Silica Material" (T.Sen.Synthesis and Characterization of Hierarchically Ordered Porous SilicaMaterials[J]Chem.Materials[J]Chem.Materials .2004, 16, 2044-2054) reported method, there is a regular macropore structure with a pore size of 100-500nm inside the molecular sieve, and a mesoporous structure with a pore size of 3-10nm exists on the macropore wall, and the porosity is greater than 74.05%. , and the molecular sieve with all the channels connected.

[0056] (3) The product obtained in step (2) was roasted at 550° C. for 36 hours;

[0057] (4) pas...

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Abstract

The invention discloses a catalyst for preparing vinylidene chloride by trichloroethane gas-phase catalytic cracking and a preparation method thereof. The catalyst comprises a carrier and active ingredients loaded on the carrier, wherein, the active ingredients are more than one of cesium chloride, potassium chloride or rubidium chloride. The catalyst obtained by the method can be applied to preparing the vinylidene chloride by 1,1,2-trichloroethane or 1,1,1-trichloroethane gas-phase catalytic cracking, wherein, when the 1,1,2-trichloroethane is taken as a cracking reaction raw material, the conversion rate can reach up to over 23.8%, and the selectivity can reach up to over 87.7%; and when the 1,1,1-trichloroethane is taken as a cracking reaction raw material, the conversion rate can reach up to over 19.2%, and the selectivity can reach up to over 99.5%, thus meeting the industrialization need.

Description

technical field [0001] The invention relates to a method for preparing vinylidene chloride by gas-phase catalytic cracking of trichloroethane, in particular to a catalyst. Background technique [0002] Vinylidene chloride (VDC) is a very important basic chemical raw material with a wide range of applications. Vinylidene chloride can be used to produce polyvinylidene chloride as well as various copolymers. Vinylidene chloride is also widely used in the production of Freon substitutes. In summary, vinylidene chloride has broad market application prospects, and it is of great significance to vigorously develop the production technology of vinylidene chloride. [0003] The traditional production process of vinylidene chloride is the saponification method of trichloroethane. The production of vinylidene chloride by this method will produce a large amount of saline organic wastewater, which does not meet the requirements of environmental protection. 1,1,2-Trichloroethane gas-ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/10C07C21/08C07C17/25
Inventor 袁向前金海龙宋宏宇蒋鹏
Owner EAST CHINA UNIV OF SCI & TECH
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