Patent ID: 9663373
Date: 2017-05-30
CPC Classifications: B01J,C01B

Claim:
1. A method of producing phosgene, comprising: reacting carbon monoxide and chlorine in a phosgene reactor in the presence of a catalyst to produce a final product composition comprising phosgene; wherein carbon tetrachloride is present in the final product composition in an amount of 0 to 10 ppm by volume, based on the total volume of phosgene; wherein the phosgene reactor comprises a tube, a shell, and a space located between the tube and the shell; wherein a peak temperature in the phosgene reactor is less than 800° C.; and wherein the catalyst is disposed in the tube and a cooling medium is located in the space, or the catalyst is disposed in the space and a cooling medium is located in the tube; wherein the tube comprises at least one of wherein when the tube comprises the mini-tube section then the reacting comprises passing a feed comprising carbon monoxide and chlorine over the catalyst in the mini-tube section to produce a first product composition, wherein the mini-tube has an average diameter of 0.1 to 10 millimeters; and passing at least a portion of the first product composition over the catalyst disposed in the second tube section, wherein the second tube section comprises an increased diameter tube with an average diameter greater than the mini-tube, to produce the final product composition.