Skw Trostberg Aktiengesellschaft

Hubertus Klima

Heinz-Rudiger Vollbrecht

Erwin Schutz

Herbert Jekat

Jurgen Graefe

Gunter Weber

Johann Wolferstetter

Process for the production of calcium cyanamide from urea

The present invention provides a process for the decaffeination of tea containing 15 to 50% by weight of water with moist carbon dioxide at 255 to 350 bar at 50.degree. to 80.degree. C. in a pressure vessel, subsequent separation of the caffeine from the carbon dioxide with the help of an adsorbent and recycling the caffeine-free carbon dioxide over the already extracted tea, wherein the adsorbent is distributed in the material to be extracted in an amount of from 5 to 40% by weight, referred to the dry weight of the tea.

Process for the decaffeination of tea

A process for obtaining solid cyanuric chloride from the cyanuric chloride vapor obtained by trimerizing cyanogen chloride whereby the cyanuric chlorid vapor is introduced into the center of many separated cold annularly disposed inert gas streams in the lower part of the condensor and whereby the solid cyanuric chloride that is obtained on the bottom of the condensor is removed, whereas the heated inert gas is removed at the side. The advantages of the process of the present invention are high condensation throughputs, minor problems with sticking as well as good product quality of the obtained cyanuric chloride.

Process for obtaining solid cyanuric chloride

The present invention provides a process for obtaining solid cyanuric chloride from a cyanuric chloride vapor obtained by the trimerization of cyanogen chloride, wherein the cyanuric chloride vapor is introduced into the upper part of a separation chamber in the center of many individual cold inert gas streams, the solid cyanuric chloride, after emergence thereof from the separation chamber, is separated from the inert gas stream by the action of centrifugal and gravitational force and the inert gas, together with a residual content of very finely crystalline cyanuric chloride, is returned, after cooling thereof, as part streams to the separation chamber.

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Tacherting, Germany

Hubertus Klima