DWP type rotary flash dryer belt drying type jet stream, hot air from a slit or hole beam up or down simultaneously sprayed material on the belt, because the jet gas velocity up to 15m / s or more, so the convective heat transfer film thin, heat transfer coefficient, and fast drying. The equipment used for gas-impermeable material class, the upper jet stream still returns above, below exhausts still returns the following, and then participating in the loop. Now switch to synthetic route benzene chlorination, nitration, nitro chlorobenzene was isolated, and then the high-pressure ammonia solution. Special intermediates for the manufacture of dyes, pesticides or pharmaceuticals, often complex, often supporting the production and the final product, the smaller yield, production of multi-batch operation. The aircraft completed a cyclone, fluidized, spouted, crushing and winnowing step technologies combine cream and cake-like material can once dried powdered qualified products; equipment is compact, small footprint, continuous operation, high production efficiency; large drying intensity, low energy consumption, thermal efficiency up to 70%; details see: www.czjianda.com