Deutsche Gold- Und Silber-scheideanstalt Vormals Roessler

Wolfgang Nischk

Ralf Goedecke

Martin Liebert

Kurt Puschner

Wolfgang Plotz

Kurt Eiermann

Franz-Ludwig Dahm

Uwe Kurandt

Herbert Diehl

Reinhold Lamberty

Dieter Mewes

There is provided an apparatus for continuous measurement of ion concentration in solutions by means of ion sensitive electrodes, which apparatus consists of an electrode containing measuring cell and a dosaging device. This apparatus is particularly suited for measuring cyanide ion concentration in strong hydrochloride solution in the presence of cyanogen chloride. The dosaging device contains a degassing section and a reflecting plate to which the supply means for the working solution to be measured and for the necessary auxiliary reagents are directed, the supply means being in the form of screens or nozzles.

Apparatus for continuously measuring ion concentrations

Solid cyanuric chloride is recovered by a process of spraying liquid cyanuric chloride which preferably is freed from chlorine and cyanogen chloride to the maximum extent possible, the cyanuric chloride is sprayed with the aid of known spraying apparatus into a separation container and solidified by indirect cooling.

Process for the recovery of solid cyanuric chloride (A)

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an intermediate storage led to a spray tower and is sprayed whereupon the solid, fine-grained cyanuric chloride is withdrawn at the bottom of the spray tower while the residual gas leaving the condenser and still containing cyanuric chloride, which amount of cyanuric chloride is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.

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Wesseling, Germany

Wolfgang Nischk