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US 12,129,177 B2Granted
Process for preparing chlorosilanes
AssigneeWacker Chemie AG
InventorKarl-Heinz Rimboeck
Life of this patent
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Abstract
The present disclosure relates to a process for producing chlorosilanes in a fluidized bed reactor by reaction of a hydrogen and silicon tetrachloride-containing reaction gas with a particulate contact mass containing silicon and a catalyst. The chlorosilanes have the general formula HnSiCl4-n and/or HmCl6-mSi2. The reactor design is described by an index K1, the constitution of the contact mass is described by an index K2 and the reaction conditions are described by an index K3.
Claims20
A process for producing chlorosilanes in a fluidized bed reactor, comprising:
- reacting a hydrogen and silicon tetrachloride-containing reaction gas with a particulate contact mass containing silicon and a catalyst, wherein the chlorosilanes have the general formula HnSiCl4-n and/or HmCl6-mSi2 where n=1-3 and m=0-4, and
- wherein the reactor design is described by an index
- K
-
- 1
- =
- φ
- ·
- V
- reactor
- ,
- eff
- A
- tot
- ,
- cooled
- ·
- d
- hyd
- ;
- wherein φ is a fill level of the reactor;
- wherein Vreactor, eff is an effective volume of the reactor [m3];
- wherein Atot, cooled is a sum of cooled surface areas in the reactor [m2];
- wherein dhyd is a hydraulic reactor diameter [m];
- and
- wherein Vreactor, eff is 1 to 300 m3;
- and
- wherein dhyd is 0.5 to 2.5 m;
- wherein the constitution of the contact mass is described by an index
- K
-
- 2
- =
- R
- S
-
- i
- ·
- B
- A
-
- K
- ·
- δ
- r
-
- e
-
- l
- d
- 3
-
- 2
- ;
- wherein BAK is a breadth of the particle size distribution of the contact mass [μm];
- wherein d32 is a particle Sauter diameter [μm];
- wherein RSi is a purity of the silicon;
- wherein δrel is a relative catalyst distribution in the contact mass;
- wherein δrel is 0.001 to 7;
- wherein d32 is 10 to 2000 μm;
- wherein BAK is 10 to 1500 μm;
- and
- wherein RSi is 0.75 to 0.99999;
- wherein the reaction conditions are described by an index
- K
-
- 3
- =
- u
- L
- v
- F
- ·
- 10
- 6
- ·
- p
- diff
- g
- ·
- 1
- ρ
- F
- ;
- wherein uL is a superficial gas velocity [m/s];
- wherein vF is a kinematic viscosity of a gaseous reaction mixture within an interior of the reactor [m2/s];
- wherein ρF is a fluid density [kg/m3];
- wherein pdiff is a pressure drop over fluidized bed [kg/m*s2];
- wherein g is an acceleration due to gravity [m/s2];
- wherein pdiff is 10 000 to 200 000 kg/m*s2;
- wherein uL is 0.05 to 2 m/s;
- wherein ρF is 2 to 20 kg/m3;
- wherein vF is 3*10−7 to 5.4*10−6 m2/s;
- and
- wherein K1 has a value of 2 to 20, wherein K2 has a value of 0.001 to 200 and
- wherein K3 has a value of 0.5 to 10 000.
93 more elements
Dependencies are inferred from the claim text.