US 12,064,733 B2
Static mixing device and method for mixing phosgene and an organic amine
Paul A. Gillis, Lake Jackson, TX (US); and Quan Yuan, Sugarland, TX (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 17/257,083
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Jul. 3, 2019, PCT No. PCT/US2019/040554
§ 371(c)(1), (2) Date Dec. 30, 2020,
PCT Pub. No. WO2020/027977, PCT Pub. Date Feb. 6, 2020.
Claims priority of provisional application 62/711,652, filed on Jul. 30, 2018.
Prior Publication US 2021/0138411 A1, May 13, 2021
Int. Cl. B01F 25/314 (2022.01); B01F 25/433 (2022.01); B01J 19/24 (2006.01); B01J 19/26 (2006.01); C07C 263/10 (2006.01)
CPC B01F 25/3141 (2022.01) [B01F 25/31423 (2022.01); B01F 25/4336 (2022.01); B01J 19/2405 (2013.01); B01J 19/26 (2013.01); C07C 263/10 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for mixing phosgene with an organic polyamine comprising;
establishing an axially directed phosgene flow through a conduit having an outer sidewall;
injecting the organic polyamine into the conduit through multiple circumferentially aligned jets, each such jet having a hydrodynamic diameter Dj and each having a location on a wall of the conduit, to establish multiple organic polyamine streams into the axially directed phosgene flow; wherein the conduit has a cross-sectional area A at the location of the one or more jets;
then passing the phosgene and the organic polyamine through a constricted region of the conduit that has a cross-sectional area less than A, wherein the constricted region is produced by a circumferential projection having a curved parabolic, elliptical, arc or hyperbolic leading edge that aligns with flow streamlines located on an internal surface of the outer sidewall of the conduit perpendicular to the axially directed phosgene flow and has a smallest cross-sectional area that is 50 to 95% of cross-sectional area A and wherein the constricted region begins downstream of the multiple jets at a distance equal to 0.01 to 3 times the hydrodynamic diameter Dj, reaches a minimum cross-sectional area at a distance equal to 1 to 3 times the hydrodynamic diameter Dj downstream of the multiple jets and extends downstream of the multiple jets to a distance that is no greater than 8 times the diameter hydrodynamic Dj; and
thereafter passing the phosgene and the organic polyamine into a region having a cross-sectional area at least 2 times as large as cross-sectional area A.