Bayer Aktiengesellschaft

Knut Hammerstrom

Friedhelm Muller

Wolfgang Lehmann

Wilfried Lobach

Gunther Cramm

Walter Horstmann

Georg Spielberger

Otto Horak

Alfredo Wust

Hans-Ulrich Alles

Ruthard Potthast

Gunther Cramn

A di- or tri-sulphonic acid hydrazide of an alkylated diphenyl ether, said hydrazide being of the formula ##STR1## wherein R.sub.1 and R.sub.2 are identical or different and represent halogen or a lower alkyl radical and R.sub.1 and R.sub.2 can denote hydrogen,

Alkyldiphenyl ether-sulphonic acid hydrazides, their preparation and

A process for separating phenol from a mixture of the same with cresol which comprises including in the mixture a component which has a dipole moment of 0 to 0.5 Debye and has a boiling point, under 1 bar, in the temperature range from 120.degree. to 220.degree. C. or which has a dipole moment of 0.5 to 2.5 Debyes and has a boiling point, under 1 bar, in the temperature range from 150.degree. to 190.degree. C. and distilling off phenol together with said component to leave behind said cresol.

Process for separating off phenol from a mixture thereof with a cresol

Water-soluble polyamines which are obtainable by reacting

Polyamines containing amide groups

Water-soluble amines which are not self-crosslinking and are obtainable by reacting (A) one or more water-soluble or water-dispersable amines containing amide groups, prepared by condensation of (a) 1 mol of dicarboxylic acid or functional derivatives thereof, (b) 0 to 30 mols of aminocarboxylic acids containing at least three C atoms, or lactams thereof, and (c) 1.4 to 30 mols of polyalkylenepolyamines of the general formula ##STR1## in which R denotes H or CH.sub.3,

In the degradation of organic compounds in an effluent by oxidizing the effluent at an elevated temperature with oxygen, the improvement which comprises effecting the oxidation at a redox potential of from about 300 to 600 millivolts, as measured with a platinum electrode against a silver-silver chloride electrode, at a temperature of from about 80.degree. to 250.degree. C and under a pressure of from about 30 to 200 bars. The redox potential may be maintained by an Fe.sup.2+ and/or Fe.sup.3+ ion system and the pH is advantageously below about 7.

Degradation of organic compounds in effluents by wet oxidation

Tetramethylethylenediamine is prepared by reacting 1,2-dichloroethane with an excess of dimethylamine at elevated temperatures and pressures. The process is carried out continuously in the presence of water and the amines in the reaction product are liberated by treatment with bases. Unconverted dimethylamine is separated and treated with water and then recycled into the reaction.

Process for the continuous preparation of tetramethylethylene-diamine

Polyethylene-polyamine salts of low viscosity and high retention action, are prepared by subjecting polyethylene-polyamine salts of higher viscosity to a thermal degradation by heating their aqueous solutions in closed reaction vessels to temperatures of 100.degree. to 180.degree. C under pressures of 2 to 10 atmospheres.

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Cologne, Germany

Knut Hammerstrom