Patent ID: 8680287

Claim:
A method for the production of a cyanopyridine, wherein (A) a gaseous reaction product comprising the cyanopyridine is produced in a reactor, (B) the gaseous reaction product is quenched with water and/or an aqueous solution in a column and a gaseous phase is obtained, which is depleted from at least a portion of the cyanopyridine, (C) the gaseous phase at a temperature of from about 40 to about 90° C. is transferred to a condenser, in which an aqueous condensate is obtained, and the gaseous phase is depleted from at least a portion of the water, (D) the gaseous phase from the condenser is passed through at least two heat exchangers, which are arranged in parallel, and an amount of condensate accumulates and is monitored in at least one of the at least two heat exchangers, and wherein, when a predetermined amount of solid has accumulated, the at least one of the at least two heat exchangers is washed, and (E) the aqueous condensate obtained in step (C) is recycled into the column of step (B).