PROCESS FOR PREPARING SOLID CYANURIC CHLORIDE IN FINE DISPERSION

摘要

1527788 Finely divided cyanuric chloride DEUTSCHE GOLD-UND SILBER-SCHEIDEANSTALT 20 Aug 1976 [23 Aug 1975] 34751/76 Heading C2C Finely divided, solid cyanotic chloride, is prepared by spraying liquid cyanuric chloride, which is free from chlorine and cyanogen chloride, into a separation column, cooling the liquid cyanotic chloride with at least one recycled inert gas to such a temperature that cyanuric chloride is deposited in crystalline form, washing the resulting heated gas containing cyanuric chloride vapour in a following second column in countercurrent with an inert liquid which is an effective solvent for cyanuric chloride in order to free the gas from evaporated cyanuric chloride, at the same time, cooling the gas and subsequently returning the gas to the separation chamber whilst the temperature of the washing liquid containing cyanuric chloride which has increased during the washing process is adjusted to the original temperature by recycling through a condenser, and continuously flushing the inside of the pipe connecting the separation column to the washing column with the washing liquid whilst separating a component stream of the washing liquid containing cyanuric chloride in a third column, which is a distillation column, into pure liquid cyanuric chloride which is recycled to the separation column, and into pure washing agent, which is recycled to the washing column. The inert gas is preferably nitrogen used at a temperature of 0-100‹ C., especially 20-60‹ C. The washing liquid may be toluene, xylene, 1,2,4-trichlorobenzene, hexachlorobutadiene, dodecylbenzene, m - chlorotrifluorotoluene, hexafluoroxylene, CF 3 CCl 3 , C 3 F 3 Cl 5 , C 8 F 18 or a mixture thereof. In the examples the product has a grain size distribution of 10-80 Á.