Degussa Aktiengesellschaft

Deutsche Gold- Und Silber-scheideanstalt Vormals Roessler

Kurt Puschner

Ralf Goedecke

Wolfgang Nischk

Martin Liebert

Wolfgang Plotz

Norbert Kriebitzsch

Friedrich Bittner

Stephanie Schauhoff

Werner Heimberger

Klaus Hentschel

Martin Petzold

Kurt Henkel

The present invention relates to a device and method for the production of cyanuric chloride. The device has three units for the production, purification and isolation of cyanuric chloride, the second unit having a partial condensation and being set in such a way that the quantity of gaseous pure cyanuric chloride produced is greater than that of the liquid impure cyanuric chloride discharged from it.

Device and process for the purification of cyanuric chloride

Solid cyanuric chloride is supplied to the gas space of a cyanuric chloride melt with the help of a gas tight product stopper. Preferably there is used for this a screw conveyor in which the gas tight stopper is formed at the end of the screw conveyor; it is most favorable if the helix ends before the last section of the tube of the screw conveyor.

Process for handling liquid cyanuric chloride

To obtain a cyanogen chloride which is practically free from water and preferably also free from hydrogen cyanide, hydrogen chloride and organic compounds, the crude cyanogen chloride is fractionally distilled. The return is led in countercurrent flow to the crude gas, thereby takes up the impurities and is further evaporated in the lower portion of the column, respectively in a special apparatus, by a liquid whose temperature is higher than the boiling temperature of cyanogen chloride. Thereby this liquid also takes up the impurities. The purification action is aided by a wash for the crude cyanogen chloride connected in series before it enters the fractionating column. It is very advantageous to combine the process with a plant for the production of cyanogen chloride.

Process for the recovery of pure cyanogen chloride

There is provided a process for the recovery of cyanuric chloride in solid or liquid form from the reaction mixture which results from the trimerization of cyanogen chloride wherein to recover the cyanuric chloride at will in liquid or solid form the gaseous reaction mixture is introduced into an apparatus combination consisting essentially of a stripping column and a condenser connected at the outlet side, preferably a head condenser, preferably above the stripping column, and in which the sump of the stripping column is held to the boiling temperature of the cyanuric chloride whereupon the cyanuric chloride contained in the gaseous reaction mixture depending on the regulation of the temperature at the outlet of the condenser in the range of 146.degree. to 190.degree. C. is partially condensed, after which to recover the liquid cyanuric chloride in liquid form it is removed as such at the lower end of the stripping column and is either directly or, in a given case, after an intermediate storage led to a spray tower and is sprayed whereupon the solid, fine-grained cyanuric chloride is withdrawn at the bottom of the spray tower while the residual gas leaving the condenser and still containing cyanuric chloride, which amount of cyanuric chloride is controlled by the temperature at the outlet of the condenser, is led preferably to a separating chamber and the residual cyanuric chloride is recovered there by known process.

Process for the recovery of cyanuric chloride

There is provided a process for the recovery of cyanuric chloride in solid or liquid form from the reaction mixture which results from the trimerization of cyanogen chloride wherein to recover the cyanuric chloride in liquid or solid form the gaseous reaction mixture is introduced into an apparatus combination consisting essentially of a stripping column and a condenser connected at the outlet side, preferably a head condenser, preferably above the stripping column, and in which the sump of the stripping column is held to the boiling temperature of the cyanuric chloride whereupon the cyanuric chloride contained in the gaseous reaction mixture depending on the regulation of the temperature at the outlet of the condenser in the range of 146.degree. to 190.degree. C. is partially condensed, after which to recover the liquid cyanuric chloride in liquid form it is removed as such at the lower end of the stripping column while the residual gas leaving the condenser and still containing cyanuric chloride, which amount of cyanuric chloride is controlled by the temperature at the outlet of the condenser, is led to a separating chamber and the residual cyanuric chloride is recovered there by known process.

There is provided a process for the recovery of cyanuric chloride in solid or liquid form from the reaction mixture which results from the trimerization of cyanogen chloride wherein to recover the cyanuric chloride the gaseous reaction mixture is introduced into an apparatus combination consisting essentially of a stripping column and a condenser connected at the outlet side, preferably a head condenser, preferably above the stripping column, and in which the sump of the stripping column is held to the boiling temperature of the cyanuric chloride whereupon the cyanuric chloride contained in the gaseous reaction mixture at the outlet of the condenser is cooled in the range of 146.degree. to 190.degree. C. and to recover the liquid cyanuric chloride in liquid form it is removed as such at the lower end of the stripping column and is either directly or, in a given case, after an intermediate storage led to a spray tower and is sprayed whereupon the solid, fine-grained cyanuric chloride is withdrawn at the bottom of the spray.

Growing community of inventors

Frankfurt-am-Main, Germany

Kurt Puschner