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Catalyst and process for the oxychlorination of ethylene to dichloroethane

A kind of technology of ethylene dichloride and catalyst, applied in the field of catalyst, can solve problems such as unfavorableness, affecting the efficiency of ethylene and hydrogen chloride raw materials and the like

Active Publication Date: 2020-02-14
氧乙烯有限合伙公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the skilled artisan understands, catalyst stickiness involves agglomeration of catalyst particles and can adversely affect ethylene and hydrogen chloride feedstock efficiency in fluidized bed oxychlorination processes

Method used

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  • Catalyst and process for the oxychlorination of ethylene to dichloroethane
  • Catalyst and process for the oxychlorination of ethylene to dichloroethane
  • Catalyst and process for the oxychlorination of ethylene to dichloroethane

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preparation example Construction

[0026] Preparation of catalyst materials

[0027] As noted above, the supported catalyst materials of the present invention may be prepared by impregnating the support via incipient wetness impregnation with an aqueous solution carrying one or more active catalyst metals and a catalyst promoter. For the purposes of this specification, and unless otherwise stated, the technique of impregnating a support is to be understood in its broadest sense and includes wetting the support over a wide range (eg, 80% to 115% of its pore volume). In one or more embodiments, the support rendered wet by treatment with an aqueous solution may subsequently be dried. In one or more embodiments, the supported catalyst or any precursor may be calcined.

[0028] In one or more embodiments, the step of impregnating the support occurs in multiple steps. In other words, the support is impregnated in two or more impregnation steps to produce the desired support material. In one or more embodiments, a ...

Embodiment

[0058] Catalysts were prepared by impregnating the alumina support with an aqueous solution of the desired metal chloride using a two-step impregnation process, except for Comparative Example 1 which was prepared using a single-step impregnation. Add the metal chloride solution to the alumina support while rotating and stirring in the ceramic dish. Each impregnation was carried out at room temperature. Following each impregnation, the ceramic discs containing the catalyst were placed in a steam bath for an initial drying stage (about 4 to 6 hours) and then heated to 180°C for a final drying stage (up to 16 hours).

[0059] The alumina support of the first set of samples (i.e. Comparative Samples 1-3 and Inventive Samples 1 and 3-6) was purchased under the tradename Catalox SCCa 25 / 200 (Sasol) and was characterized by a pore volume of 0.40-0.50mL / g, the surface area is 180-210m 2 / g, particle size distribution with 0%-10% of particles smaller than 22 μm and 905–100% of partic...

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Abstract

An oxychlorination process of the type wherein ethylene is converted to 1,2-dichloroethane in the presence of a supported copper catalyst, the improvement comprising using a supported catalyst prepared by: (i) In a first step, impregnating the alumina support with a first aqueous solution comprising copper to form a first catalyst component; and (ii) in a subsequent step, impregnating the first catalyst component with a second aqueous solution comprising copper and an alkaline earth metal Thus forming a supported catalyst.

Description

[0001] This application claims the benefit of US Provisional Application Serial No. 62 / 015,732, filed June 23, 2014, which is incorporated herein by reference. [0002] field of invention [0003] Embodiments of the invention relate to catalysts for the oxychlorination of ethylene to methylene chloride. The catalysts advantageously exhibit less stickiness, especially at high copper loadings, and they can therefore be advantageously used in baffled bed reactors. [0004] Background of the invention [0005] Oxychlorination is a process in which ethylene is converted to 1,2-dichloroethane. This reaction can be carried out as a gas phase reaction on a fluidized catalyst bed in a mixture of ethylene, hydrogen chloride and oxygen (eg, pure oxygen or air). Copper catalysts supported on alumina supports are well known in the art of oxychlorination catalysts. For example, U.S. Patent No. 5,292,703 teaches a catalyst for the oxychlorination of ethylene to produce 1,2-dichloroethane, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/156C07C19/045B01J23/76B01J21/10B01J35/00
CPCB01J21/10B01J23/76C07C17/156B01J35/40C07C19/045B01J23/8892B01J21/04B01J23/72B01J23/78B01J37/0201B01J35/633B01J35/635B01J35/615B01J37/024B01J35/19
Inventor K·克雷默
Owner 氧乙烯有限合伙公司