PROCESS FOR STABILIZING HEAT EXCHANGER TUBES IN ANDRUSSOW PROCESS

摘要

The present invention relates to an improved process for producing hydrogen cyanide involving a heat exchanger comprising a plurality of tubes, wherein each of the plurality of tubes comprises a ceramic ferrule extending through the entrance of the tube, each ferrule comprising an insulation layer surrounding at least a portion of the ferrule, and one or more washers, wherein at least one of the one or more washers surrounds the ferrule above the entrance of the tube, wherein the ceramic ferrule is spaced apart from the tube. It further relates to a reaction apparatus for producing hydrogen cyanide involving a heat exchanger comprising a plurality of tubes, wherein each of the plurality of tubes comprises a ceramic ferrule extending through the entrance of the tube, each ferrule comprising an insulation layer surrounding at least a portion of the ferrule, and one or more washers, wherein at least one of the one or more washers surrounds the ferrule above the entrance of the tube, wherein the ceramic ferrule is spaced apart from the tube. It further relates to the heat exchanger for use in this improved process and reaction apparatus.

主权项

1. A process for producing hydrogen cyanide comprising:
(a) reacting a ternary gas mixture comprising at least 25 vol. % oxygen in a reactor to form a crude hydrogen cyanide product; (b) passing the crude hydrogen cyanide product through a heat exchanger comprising a plurality of tubes; and (c) recovering hydrogen cyanide from the crude hydrogen cyanide product; wherein each of the plurality of tubes comprises a ceramic ferrule comprising at least 90 wt. % alumina extending through the entrance of the tube, each ferrule comprising an insulation layer surrounding at least a portion of the ferrule, and one or more ceramic washers comprising at least 90 wt. % alumina, wherein at least one of the one or more ceramic washers surrounds the ferrule above the entrance of the tube, wherein the ceramic ferrule is spaced apart from the tube.