Thermal condensation reactor

Patent metadata

Field	Value
Publication number	US-2022401907-A1
Application number	US-202017765825-A
Country	US
Kind code	A1
Filing date	Sep 30, 2020
Priority date	Oct 1, 2019
Publication date	Dec 22, 2022
Grant date	—

Abstract

Described herein are thermal condensation reactors and processes of using the same. A presently described thermal condensation reactor includes a heat transfer chamber, wherein the heat transfer chamber is a fluidized bed having a fluidization gas flow in a first direction, and wherein the heat transfer chamber has a plurality of heating zones that may be maintained at different temperatures, and a plurality of reaction tubes disposed in the heat transfer chamber in a second direction perpendicular to the fluidization gas flow, each reaction tube having a reactant gas flow that passes through the plurality of heating zones.

First claim

1 . A thermal condensation reactor, comprising:
a heat transfer chamber, wherein the heat transfer chamber is a fluidized bed having a fluidization gas flow in a first direction, and wherein the heat transfer chamber comprises a plurality of heating zones that are maintained at different temperatures; and a plurality of reaction tubes disposed in the heat transfer chamber in a second direction that is perpendicular to the fluidization gas flow, each of the plurality of reaction tubes having a reactant gas flow that passes through the plurality of heating zones.

2 . The thermal condensation reactor of claim 1 , wherein the fluidization gas flow is vertical and the reactant gas flow is horizontal.

3 . The thermal condensation reactor of claim 1 , further comprising a port for introducing a shroud gas, wherein the shroud gas flows through a portion of each of the plurality of reaction tubes.

4 . The thermal condensation reactor of claim 3 , wherein the reactant gas is a mixture of vinyl chloride and trichlorosilane, and wherein the shroud gas is silicon tetrachloride.

5 . The thermal condensation reactor of claim 1 , wherein each of the plurality of reaction tubes is associated with a sealing gland integrated with an interior liner comprising either graphite, carbon fiber carbon composite, silicon carbide-coated isomolded graphite, or silicon carbide.

6 . The thermal condensation reactor of claim 1 , further comprising a bonnet for covering the gas flow inlets of the plurality of reaction tubes.

7 . The thermal condensation reactor of claim 1 , further comprising a floating head for covering the gas flow outlets of the plurality of reaction tubes, wherein the floating head is moveable in the second direction.

8 . The thermal condensation reactor of claim 7 , further comprising a cooling transition unit that encompasses the floating head, and wherein the cooling transition unit is also a fluidized bed.

9 . The thermal condensation reactor of claim 1 , further comprising one or more roller supports associated with the heat transfer chamber to accommodate thermal expansion.

10 . The thermal condensation reactor of claim 1 , further comprising one or more baffles disposed in the heat transfer chamber.

11 . A process for producing an alkenyl-functional halosilane comprising:
premixing an alkenyl halide and a hydrido-functional halosilane to create a reactant gas; introducing the reactant gas into a plurality of reaction tubes arranged horizontally in a fluidized bed; and passing the reactant gas through a plurality of heating zones in the fluidized bed, wherein the plurality of heating zones are maintained at different temperatures.

12 . The process of claim 11 , further comprising diluting the reactant gas with a shroud gas comprising of the halogenation product of the hydrido-functional halosilane and hydrogen halide.

13 . The process of claim 11 , wherein the alkenyl halide is vinyl chloride.

14 . The process of claim 11 , wherein the hydrido-functional halosilane has formula R w H x SiX (4−w−x) , where subscript w is 0 to 2, subscript x is 1 to 3, and a quantity (w+x) is 1 to 3; each R is an independently selected monovalent hydrocarbon group of 1 to 18 carbon atoms that is free of aliphatic unsaturation, and each X is an independently selected halogen atom.

15 . The process of claim 14 , wherein the hydrido-functional halosilane is trichlorosilane.

16 . The process of claim 12 , wherein the alkenyl halide is vinyl chloride.

17 . The process of claim 12 , wherein the hydrido-functional halosilane has formula R w H x SiX (4−w−x) , where subscript w is 0 to 2, subscript x is 1 to 3, and a quantity (w+x) is 1 to 3; each R is an independently selected monovalent hydrocarbon group of 1 to 18 carbon atoms that is free of aliphatic unsaturation, and each X is an independently selected halogen atom.

18 . The process of claim 13 , wherein the hydrido-functional halosilane has formula R w H x SiX (4−w−x) , where subscript w is 0 to 2, subscript x is 1 to 3, and a quantity (w+x) is 1 to 3; each R is an independently selected monovalent hydrocarbon group of 1 to 18 carbon atoms that is free of aliphatic unsaturation, and each X is an independently selected halogen atom.

19 . The process of claim 16 , wherein the hydrido-functional halosilane has formula R w H x SiX (4−w−x) , where subscript w is 0 to 2, subscript x is 1 to 3, and a quantity (w+x) is 1 to 3; each R is an independently selected monovalent hydrocarbon group of 1 to 18 carbon atoms that is free of aliphatic unsaturation, and each X is an independently selected halogen atom.

Assignees

• Dow Silicones Corp
• Dow Global Technologies Llc

Inventors

• Molnar Michael
• Punganur Mohan

Classifications

• C07F7/12 Primary

  Organo silicon halides · CPC title

• B01J8/067

  Heating or cooling the reactor (B01J8/062 takes precedence) · CPC title

• B01J2208/00415

  electric resistance heaters · CPC title

• B01J19/2425 Primary

  in parallel · CPC title

• B01J2219/00135

  Electric resistance heaters · CPC title