Preparation of xylylenediamine comprises continuously hydrogenating phthalodinitrile over a heterogeneous catalyst in the presence of liquid ammonia, where a portion of reactor effluent is recycled continuously to the reactor inlet

摘要

Preparation of xylylenediamine by continuously hydrogenating phthalodinitrile over a heterogeneous catalyst in a reactor, in which a portion of the reactor effluent is recycled as a liquid circulation stream continuously to the reactor inlet, comprises mixing phthalodinitrile by a mixing device with a stream of liquid ammonia (stream a) and a further stream that is removed at least as a sub-stream from the circulation stream around the hydrogenation reactor (stream b), or mixing of streams a and b, and conducting the resulting liquid mixture into the hydrogenation reactor. Preparation of xylylenediamine by continuously hydrogenating phthalodinitrile over a heterogeneous catalyst in the presence of liquid ammonia in a reactor, in which a portion of the reactor effluent is recycled as a liquid circulation stream continuously to the reactor inlet (circulation mode), comprises mixing phthalodinitrile, as melt or in solid form, by a mixing device with a stream of liquid ammonia (stream a) and a further stream that is drawn off at least as a sub-stream from the circulation stream around the hydrogenation reactor (stream b), or mixing of streams a and b, and conducting the resulting liquid mixture into the hydrogenation reactor.