Basf Aktiengesellschaft

Siegfried Marquardt

Bruno Sander

Uwe Kempe

Gero Lueth

Hans Diem

Christian Dudeck

Knut Kaempfer

Hans Gettert

Werner Simmler

Wolfgang Vodrazka

Robert K Horn

Walter Stingl

K Robert Mueller

The soot obtained in the form of a soot-containing aqueous waste liquor in the course of synthesis gas manufacture is utilizable by

Utilization of soot from synthesis gas production in sewage treatment

Carbon black and ash containing wastewaters from high-temperature processes in which the carbon black is present in an extremely finely divided and partly colloidal state are cleaned and disposed of by treatment with organic flocculants, predewatering of the flocculated suspension by gravity filtration and post-dewatering of the carbon black sludge by pressure filtration within the range from 0.5 to 15 bar in a process comprising adding sufficient calcium hydroxide to the wastewaters that the pH of an aqueous extract of the filter cake obtained is more than 11.8, preferably more than 12.0.

Cleaning and disposal of carbon black and ash containing wastewaters

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

An improved process for the manufacture of silver catalysts, in which the silver is applied to conventional dimensionally stable and chemically inert carriers, eg. alumina or quartz moldings, preferably by electroless deposition from silver salt solutions onto a great variety of surfaces acting as carriers, by the use of suitable reducing agents. In a particular embodiment, a uniform deposition of silver and a dense and well-adhering silver layer on the surface of the carrier are achieved by adding certain materials to the silver salt solutions.

Manufacture of supported silver catalysts

Growing community of inventors

Bobenheim-Roxheim, Germany

Siegfried Marquardt