Production method for trichlorosilane, and pipe

Patent metadata

Field	Value
Publication number	US-2020368705-A1
Application number	US-201816765071-A
Country	US
Kind code	A1
Filing date	Nov 16, 2018
Priority date	Nov 20, 2017
Publication date	Nov 26, 2020
Grant date	—

Abstract

To prevent solidified aluminum chloride from adhering to and accumulating on a pipe and also prevent stress-corrosion cracking in the pipe, a method for producing trichlorosilane includes a cooling step of cooling a discharge gas that is discharged from a fluidized-bed reactor and that contains the trichlorosilane, the cooling step involving causing a fluid to flow through a space (4) inside a side wall (3) of a pipe (10), the pipe being a pipe for discharging the discharge gas from the fluidized-bed reactor, in such a manner that the side wall (3) has a surface (1a) having a temperature of not lower than 110° C.

First claim

1 . A method for producing trichlorosilane, the method comprising:
a cooling step of cooling a discharge gas that is discharged from a fluidized-bed reactor configured to produce the trichlorosilane and that contains the trichlorosilane, the cooling step involving causing a fluid to flow through a space inside a side wall of a pipe, the pipe being a pipe for discharging the discharge gas from the fluidized-bed reactor, in such a manner that the side wall has a surface with which the discharge gas flowing through the space is in contact, the surface having a temperature of not lower than 110° C.

2 . The method according to claim 1 , wherein
the cooling step involves causing the fluid to flow through the space in such a manner that the side wall has a lowermost portion having a surface temperature of lower than 125° C.

3 . The method according to claim 1 , wherein
the fluid is air having a temperature of not lower than 30° C.

4 . The method according to claim 1 , wherein
the fluid is high-temperature water having a temperature of not lower than 100° C.

5 . A pipe for discharging a discharge gas that is discharged from a fluidized-bed reactor configured to produce trichlorosilane and that contains the trichlorosilane, the pipe comprising:
side walls including (i) a first wall having a surface with which the discharge gas comes into contact and (ii) a second wall provided outward of the first wall, the first wall and the second wall defining therebetween a space through which a fluid is caused to flow.

6 . The pipe according to claim 5 , further comprising:
an inner shell in an inner-space section of the pipe through which inner-space section the discharge gas flows, the inner shell having a diameter smaller than an inner diameter of the pipe, wherein the inner-space section has a narrow-path zone in at least a partial zone of the inner-space section, the narrow-path zone being a zone in which the discharge gas flows through a channel narrowed by the inner shell.

Assignees

• Tokuyama Corp

Inventors

• Hirota Kenji
• Ogihara Katsuya

Classifications

• B01J2208/00221

  comprising baffles for guiding the flow of the heat exchange medium · CPC title

• B01J2208/00212

  Plates; Jackets; Cylinders · CPC title

• C01B33/1071 Primary

  Tetrachloride, trichlorosilane or silicochloroform, dichlorosilane, monochlorosilane or mixtures thereof · CPC title

• C01B33/10763 Primary

  from silicon · CPC title

• B01J2208/00194

  Tubes · CPC title