US 12,065,457 B2
Process for preparing methylchlorosilanes with structure-optimised silicon particles
Karl-Heinz Rimböck, Heldenstein (DE); Michael Müller, Burghausen (DE); and Natalia Sofina, Burghausen (DE)
Assigned to Wacker Chemie AG, Munich (DE)
Appl. No. 17/429,652
Filed by Wacker Chemie AG, Munich (DE)
PCT Filed Jun. 14, 2019, PCT No. PCT/EP2019/065735
§ 371(c)(1), (2) Date Aug. 10, 2021,
PCT Pub. No. WO2020/249237, PCT Pub. Date Dec. 17, 2020.
Prior Publication US 2022/0119422 A1, Apr. 21, 2022
Int. Cl. C07F 7/16 (2006.01); B01J 23/72 (2006.01)
CPC C07F 7/16 (2013.01) [B01J 23/72 (2013.01)] 13 Claims
 
1. A process for producing methylchlorosilanes of general formula 1
(CH3)nHmSiCl4-n-m  (1),
in which
n represents values from 1 to 3 and
m represents values of 0 or 1
in a fluidized bed reactor, wherein a chloromethane-containing reaction gas is reacted with a particulate contact mass containing silicon in the presence of copper catalyst,
wherein an operating granulation, i.e. the granulation or granulation mixture introduced into the fluidized bed reactor, contains at least 1% by mass of silicon-containing particles S described by a structural parameter S, wherein S has a value of greater than 0 and is calculated as follows:

OG Complex Work Unit Math
wherein
φS is symmetry-weighted sphericity factor
ρSD is poured density [g/cm3]
ρF is average particle solids density [g/cm3].