Chlorothalonil,CAS 1897-45-6

White Solid Chlorothalonil is a combustible, white, odorless, crystalline solidChEBI: A dinitrile that is benzene-1,3-dicarbonitrile substituted by four chloro groups. A non-systemic fungicide first introduced in the 1960s, it is used to control a range of diseases in a wide variety of crops.Chlorothalonil is a broad-spectrum organic fungicide mainly used to control fungi that threatens a number of agricultural crops, vegetables, trees, fruits, turf and paints, etc. It can also serves as a wood

Chlorothalonil Use and Manufacturing
Methods of Manufacturing
Ammonia oxidation The meta-xylene is carried into the reactor in a gaseous state, the liquid ammonia is preheated by evaporation and then the reactor, and the air is filtered and heat-exchanged to carry out the reactor to cause the ammonia oxidation reaction. The catalyst is silica gel as the carrier V-Cr as the main component, and the reactor is a fluidized bed. The generated m-dibenzonitrile is desublimated and continuously discharged. Exhaust gas is recovered in excess of ammonia or directly to the three wastes. After centrifugal dehydration and drying, the m-dibenzonitrile is obtained as a crude product with a content of 94% to 98% and a yield of ≥90%. Refining can adopt methods such as vacuum distillation, water washing or solvent extraction. The chlorinated isophthalonitrile is melted and sent to the vaporizer for vaporization or atomized directly with a part of the gas stream (N2) through the nozzle to carry out the reactor. After drying and preheating, chlorine gas is mixed with gaseous isophthalonitrile. Nitrogen gas is used as diluent gas for vaporization or atomization of isophthalonitrile and adjustment of reactant concentration. The reactor adopts fluidized bed or other forms. After the reaction, the gas enters the trap, and the chlorothalonil is precipitated and continuously sent out to be the product, and the yield is 90%. The tail gas is mainly chlorine, hydrogen chloride and nitrogen, which can be partially recycled or completely removed from the tail gas recovery and treatment system. Liquid carbon tetrachloride can also be sprayed into the trap. After contact with the reaction gas, chlorothalonil is precipitated. Carbon tetrachloride is vaporized and discharged together with the tail gas. After further cooling to -6℃, carbon tetrachloride is condensed and recycled.
Uses
Fungicide, bactericide, nematocide.Agricultural and horticultural fungicide.