The issue with thionyl chloride and acyl chlorides
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Why must sulfuryl chloride be evaporated from the acyl chlorides produced using it?
Sulfoxide reacts with carboxyl groups to produce acyl chlorides, as well as sulfur dioxide and hydrogen chloride; to control the purity of the acyl chlorides, an excess of sulfoxide is used in the reaction. Moreover, the boiling point of thionyl chloride is only 76 degrees, allowing excess thionyl chloride to evaporate after the reaction is complete, thereby yielding a relatively pure acid chloride. (Personal opinion)
The answer for the second floor is correct, but since it contains chloride ions, graphite heat exchangers are the best choice for its heater and condenser, as this helps to prevent corrosion of the equipment.
During the production of acyl chlorides, sulfoxide chloride is used in excess; after the reaction, the excess sulfoxide chloride is evaporated, which is equivalent to a separation process.