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Wear resistant materials in the direct process

A loss-resistant, direct method technology, applied in indirect heat exchangers, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as inefficiency, unpredictable conditions required for coating, and difficulty in maintaining integrity

Inactive Publication Date: 2009-09-16
DOW SILICONES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, because the environment includes such chemically aggressive materials, it is difficult to predict which materials will remain intact
In addition, it is also difficult to predict which will adhere adequately because of the frequent thermal cycling and the stresses caused by the different coefficients of thermal expansion of the heat exchange element and the coating
Finally, the conditions required for coating are completely unpredictable as coatings that would remain intact in an otherwise corrosive environment (such as thermally sprayed tungsten carbide) would not be effective in this environment

Method used

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  • Wear resistant materials in the direct process

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Embodiment Construction

[0012] The present invention is an improvement to a fluidized bed reactor for reacting metallic silicon powder with organic halides or hydrogen halides to form halosilanes. The reactor typically includes: a reaction chamber; and at least one heat exchange element located in said reaction chamber for conveying a heat transfer medium. The present invention is characterized in that a wear-resistant coating of high hardness and high bonding strength is formed on at least a part of the heat exchange element so as to remain intact under the physical and chemical environment of the direct method.

[0013] exist figure 1 In the fluidized bed reactor, the fluidized bed reactor comprises a shell 1 having an inlet 2 for organic halides or halogen halides, an inlet 3 for silicon powder, an inlet 4 for nitrogen gas, and an outlet 5 for bed waste. The inlets 2 , 3 , 4 and the outlet 5 are separated from the reaction chamber of the reactor by a distribution plate 6 . Products, by-products...

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Abstract

The present invention relates to a heat exchange element for use in the direct process. The heat exchange element comprises a heat exchange element with a wear resistant coating on the surface of at least a portion of its surface. The wear resistant coating forms strong bonds to the heat exchange element and has a hardness greater than 50 Rockwell C. Such a coating can survive the physical and chemical environment present in the direct process.

Description

[0001] Cross-references to related applications [0002] none Background technique [0003] The invention relates to a heat exchange element for use in the direct process. The heat exchange element includes a heat exchange element coated with a wear resistant coating on at least a portion of its surface. The anti-wear coating forms a strong bond with the heat exchange element and has a hardness higher than 50HRC. This coating can remain intact in the physical and chemical environment of the direct method. [0004] The manufacture of halosilanes typically involves the reaction of silicon powder with a reactive gas (typically methyl chloride or hydrogen chloride) (often referred to as the "direct process"). This reaction is exothermic and generally requires removal of the heat generated. The heat is typically removed by means of a heat exchange fluid flowing through heat exchange tubes which are in direct contact with the silicon powder and reaction gases at high temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F19/06
CPCF28F19/02B01J19/02B01J8/1836B01J2208/00132F28D13/00B01J2219/0236F28F19/06
Inventor J·J·克莱兰霍斯特M·G·克罗帕J·莫洛伊R·T·普里特查德M·施劳本
Owner DOW SILICONES CORP