Hoechst Aktiengesellschaft

Joachim Semel

Helmold Von Plessen

Gerhard Luft

Heribert Tetzlaff

Jorg Schmid

Uwe Wirth

Wolfgang Schick

Ulrich Rappold

Maria Pille

Heinrich Merten

Gunther Lyding

Matthias Schubert

Wolfgang Mueller

Process for separating hydrogen halides from gases containing sulphur

The invention relates to a process for eliminating adsorbable organic halogen compounds from an aqueous phase, in particular from wastewater or from a process solution, in which the aqueous phase is treated with a nonaqueous extraction medium in a liquid-liquid extraction, which comprises, after the extraction, subjecting the adsorbable organic halogen compounds in the extraction medium to a Wurtz-Fittig reaction. Only small amounts of noncritical products such as NaOH and Hcl, which can be readily removed, are formed in the nonaqueous extraction medium. By means of this process, the cost of the chemicals which conventionally arises in the elimination of the adsorbable organic halogen compounds is considerably decreased.

Process for eliminating adsorbable organic halogen compounds from

Heating of polyvinyl chloride, in particular plasticizer-containing polyvinyl chloride, to a temperature of from 250.degree. to 500.degree. C. in the absence of oxygen gives a low-chlorine, carbon-containing residue, plasticizer and hydrogen chloride.

Process for the recovery of valuable materials during the work-up of

In isolating fullerenes from fullerene-containing soot the soot is heated by using microwaves to from 300.degree. to 800.degree. C. and the evaporating fullerenes are condensed.

Isolation of fullerenes

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Eppstein, Germany

Joachim Semel