Disclosed are novel processes and novel intermediate compounds for preparing aryl-and heteroaryl-substituted urea compounds of the formula wherein Ar1, Ar2, L, Q and X are described herein. Preferably, four arms are provided that are spaced 90 degrees from each other thereby defining two sets of opposing arms. A safety stop is connected to the second end of the connector and adapted to move from a down position to an up position. The feed to the furnace comprises a portion of the bottoms stream from the tower and the furnace output is fed back into the tower bottom to be quenched.