Basf Aktiengesellschaft

Knut Kaempfer

Klaus Hahn

Franz J Broecker

Hans Gettert

Michael Witt

Matthias Schwarzmann

Wolfram Husemann

Bruno Triebskorn

Laszlo Marosi

Hans Hintz

Dieter Naegele

Michael Riethues

Guenter Zirker

Winfried Dethlefsen

Anthony Schaefer

Dietrich Scherzer

Frank Braun

Bruno Sander

Hans D Zettler

Guiscard Gl&uuml;ck

Jan Holoch

Gerhard Alicke

Michael Schiessl

Siegfried Marquardt

Michael Baumgartel

Frieder Hohwiller

Karl-Heinz Batscheider

Gerhard Dembek

Laslo Marosi

Peter Nikolaus Lay

Guiscard Glueck

K Robert Mueller

Particulate expandable styrene polymers contain homogeneously distributed graphite particles and can be processed to give self-extinguishing foams having a density of &lE;35 g/l.

Expandable styrene polymers containing graphite particles

Method for producing expandable styrene polymers containing graphite

Continuous production process of expandable styrene polymer beads

Expandable styrene polymers containing recycled polystyrene have a content of recycled material of up to 40% by weight, based on the total weight of the polystyrene, wherein, in the course of the polymerization of the reaction mixture, from 100 to 500 ppm of a molecular weight regulator and/or from 0.05 to 1.0% by weight, based in each case on the polymerization solution, of a finely divided polyethylene wax are added.

Expandable styrene polymers containing recycled material

The invention relates to expandable styrene polymers containing

Expandable styrene polymers containing carbon dioxide as blowing agent

Wastewaters which contain carbon black and ash and originate from high temperature processes and in which the carbon black is present in a very finely divided state and partially in a colloidal state are treated and disposed of by a process in which the wastewater is treated with calcium carbonate or calcium hydroxide and an organic flocculant and subjected to a two-stage filtration and the resulting filter cake containing carbon black and ash is subjected to an aftertreatment with an aqueous iron salt solution.

Treatment and disposal of wastewaters containing carbon black and ash

H.sub.2 S-containing gases are desulfurized by direct catalytic oxidation of the H.sub.2 S to elemental sulfur with an oxygen-containing gas at elevated temperatures by a method in which the catalyst used is a supported titanium dioxide catalyst containing from 0.1 to 25% by weight of nickel oxide and from 0 to 10% by weight of aluminum oxide, the percentages being based on the supported catalyst.

Desulfurization of H.sub.2 S-containing gases

Gases containing CO and/or CO.sub.2 are purified by removing sulfur compounds and other impurities by catalytic reaction at elevated temperatures by a process in which the gases to be purified are passed directly through a catalyst charge containing a Cu/ZnO catalyst prepared by thermal decomposition of a mixed crystalline compound of zinc hydroxide carbonate, and the space velocity is set at 500-5,000 m.sup.3 (S.T.P.) per m.sup.3 of catalyst per hour. Preferably, the catalyst used is a Cu/ZnO catalyst which is prepared by thermal decomposition of a catalyst precursor of the general formula

Purification of gases containing CO and/or CO.sub.2

H.sub.2 S-containing gases are desulfurized by direct catalytic oxidation of the H.sub.2 S to elementary sulfur by means of oxygen-containing gases in a tube reactor, with indirect removal of the heat of reaction by means of a coolant and with condensation of the sulfur formed, wherein either the catalyst is present in the jacket space around the tubes and the coolant is present in the tubes of the reactor or the coolant is present in the jacket space around the tubes and the catalyst is present in the tubes of the reactor, and the catalyst fills the tubes of the tube reactor or the jacket space around the tubes over the entire cross-section of the tubes or the jacket space respectively, the exit temperature of the gaseous reaction mixture leaving the tube reactor is kept at 180.degree.-400.degree. C. and the sulfur formed in the tube reactor is separated out of the reaction mixture, obtained in the reactor, in a condensation stage downstream of the reactor.

A process for preventing deposits in the pipes of waste heat boilers employed for cooling gases in the partial autothermal oxidation of fossil fuels to prepare hydrogen or synthesis gases, wherein the pipes are flushed, at the operating temperature, with hydrogen-containing gases which contain little or no H.sub.2 S.

Method of prevention of deposits in the pipes of waste heat boilers

The compound Ni.sub.5 MgAl.sub.2 (OH).sub.16.sup.. CO.sub.3.sup.. 4H.sub.2 O is precipitated from an aqueous solution containing salts of nickel, magnesium and aluminum with a carbonate or bicarbonate of an alkali metal. After this catalyst precursor has been dried, calcined and reduced with hydrogen a catalyst can be prepared which is suitable for the cracking of hydrocarbons in the presence of steam. In the steam cracking of hydrocarbons the hydrocarbon and the steam may be reacted to form a gas rich in methane in contact with this catalyst at a preheating temperature of less than 300.degree. C.

Catalyst and the use thereof for the production of gas containing methane

A two-stage process for the manufacture of methane from hydrocarbons is described. In the first stage, the hydrocarbons are converted into methane-rich gases, using the nickel catalyst described below. The cracked gases thus obtained are cooled and converted into methane-rich gases in a further catalytic process stage, using a methanization catalyst or the nickel catalyst mentioned below. To produce the nickel catalyst, the compound Ni.sub.6 Al.sub.2 (OH).sub.16.CO.sub.3.4H.sub.2 O is prepared in aqueous solution. The catalyst is obtained from this compound by drying, calcination and subsequent reduction in a stream of hydrogen whilst maintaining very specific temperature gradients between the drying stage and the calcination stage.

Manufacture of methane

The compound Ni.sub.6 Al.sub.2 (OH).sub.16. CO.sub.3. 4H.sub.2 O is isolated from aqueous solution. The catalyst is obtained from this compound by drying, calcination and subsequent reduction in a stream of hydrogen, whilst maintaining very specific temperature gradients between the drying stage and the calcination stage. A process for the manufacture of gases containing methane from hydrocarbons by steam cracking, in which the abovementioned catalyst is employed, is also described.

Catalyst for the manufacture of gases containing methane

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Ludwigshafen, Germany

Knut Kaempfer