L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

Messer Se &co. Kgaa

Messer Group Gmbh

Air Liquide Deutschland Gmbh

Joachim Barbe

Rolf Van Bonn

Friedhelm Herzog

Siegfried Rödel

In order to separate diborane from a gas mixture containing diborane and hydrogen, the gas mixture is normally cooled in a storage tank using liquid nitrogen, wherein the diborane freezes out. In order to enable an extensively continuous separation of the diborane from the gas mixture, according to the invention, the gas mixture is brought into thermal contact with a liquefied gas in a heat exchanger, which liquefied gas is held at a pressure such that the diborane is liquefied by the thermal contact with the coolant, and the liquefied diborane is then discharged from the first heat exchanger and supplied to a storage tank. In a downstream, second heat exchanger, the diborane remaining in the gas mixture can then be caused to freeze out.

Method and device for separating a gas mixture containing diborane and hydrogen

The gas-phase fluorination of plastic articles is effected in a reaction chamberinto which the plastic articles to be fluorinated are introduced. The gas-phase fluorination is effected at normal or atmospheric ambient pressure of about 1 kPa in the reaction chamber. The gas-phase fluorination can be carried out statically or dynamically. The flushing carried out before the gas-phase fluorination for complete or partial removal of atmospheric oxygen from the reaction chambercan also be effected at atmospheric pressure in the reaction chamber. The reaction chamberis equipped with a coverand metering valves V, V, Vfor air, inert gas and gas mixture comprising fluorine and one or more inert gases are present on the entrance side of the reaction chamber, which is not vacuum-tight and hence also cannot be evacuated. The metering valves are connected to the reaction chambervia a flow meter. A release valve Vand a flow-through/shut-off valve Vare arranged in an exhaust gas lineof the reaction chamber

Method and apparatus for the fluorination of plastics

The invention relates to a method for the modification of the surface of shaped parts made of plastic by treatment with a gas mixture which comprises fluorine and oxygen. The surface tension of the modified surface of the shaped part is more than 25 mN/m greater than that of a surface comprising non-modified plastic material. The ratio of the partial pressure of fluorine to the partial pressure of oxygen is 1:10 or lower and the shaped part has a fluorine occupancy of less than 0.5 &#x3bc;g/cmas a result of the treatment.

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Tönisvorst, Germany

Joachim Barbe