Bayer Aktiengesellschaft

Joachim Priemer

Imre Pascik

Edmund Giez

Herbert Bartl

Wulf Schwerdtel

Aziz El-Sayed

Norbert Schenk

Jorg Krekel

Raoul Resz

Karl Nothen

Nikolaus Schulz

Georg Nicklas

A polyurethane foam web with a thickness of 5 mm to 30 mm is passed continuously through a dipping bath and is thereby impregnated with 10% to 1000% by weight of a polymer dispersion consisting of the components A) and B) defined below:

Filler-modified polyurethane foam supports for bioconversion processes

In this process, a polyurethane foam web with a thickness of 5 mm to 30 mm is passed continuously through a dipping bath and is thereby impregnated with 10% to 1000% by weight of a polymer dispersion consisting of the components A) and B) defined below:

Process for the manufacture of filler-modified polyurethane foam

A process has now been found for the isolation of purified anthraquinone from the crude anthraquinone which has been obtained by oxidation of naphthalene to give naphthoquinone, reaction of the oxidation product with butadiene to give tetrahydroanthraquinone, oxydehydrogenation of this reaction product with molecular oxygen to give a crude anthraquinone and optionally removal of naphthalene, phthalic anhydride and low-boiling substances from this crude anthraquinone, which is characterized in that the crude anthraquinone is treated with an oxygen compound of the elements of the first and/or second main group of the periodic system at an elevated temperature, optionally in the presence of a solvent, and purified anthraquinone is then isolated by subliming the anthraquinone present at a temperature of about 190.degree. to about 290.degree. C. and a pressure of about 1 to about 90 mm Hg and then desubliming it under the same pressure, or by vaporizing the pretreated anthraquinone at a temperature of about 290.degree. to about 380.degree. C. and a pressure of about 90 to about 760 mm Hg and condensing the vapor under a pressure of about 90 to about 760 mm Hg.

Process for the isolation of purified anthraquinone

A process for the production of partially or completely hydrolyzed ethylene/vinyl acetate copolymer which is suitable for the various powder coating techniques, wherein the polymer solution is extruded in a non-gelled state into water with a temperature no more than 20.degree. C below the gellation temperature and the gelling solution is converted into particles from 0.02 to 5 mm in diameter by means of high shear forces.

Process for the production of powder-form hydrolyzed ethylene/vinyl

To isolate naphthoquinone and phthalic anhydride from the gas obtained in the gas phase oxidation of naphthalene, the gas product at 250.degree. to 500.degree. C is first quenched with a counter-current liquid stream of naphthalene, naphthoquinone and phthalic anhydride. The liquid is raised to at most 200.degree. C, cooled and partly recycled, the coolant temperature being within 70.degree. C of the temperature of the liquid being cooled. The portion of the quench liquid which is not recycled is the product, viz. a solution of naphthoquinone and phthalic anhydride in naphthalene. The quenched gas is scrubbed with liquid naphthalene and most of the liquid product is cooled and re-cycled, the balance of the liquid product being passed to the quencher. The gas which leaves the scrubber is substantially free from naphthoquinone and phthalic anhydride. The initial gas may have been pre-cooled by evaporative cooling. The surfaces of the quencher, cooler and pipes of the quenching system are preferably of stainless steel or are smoothed either mechanically or by coating with plastic, enamel, ceramic or metal.

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Odenthal, Germany

Joachim Priemer