Basf Aktiengesellschaft

Emil Scharf

Otto Hertel

Rolf Fikentscher

Herbert Mueller

Werner Streit

Werner Auhorn

Rainer Becker

Herbert Naarmann

Friedrich Linhart

Gerhard Jeschek

Willibald Schoenleben

Hans Hammer

Michael Huellmann

Jaroslav Melzer

Guenter Boettger

Fritz Reichel

Hubert Schoeppl

Gerhard Paulus

Preparation of N-(2-hydroxyethyl)-piperazine by reacting triethanolamine with ammonia in the presence of hydrogen at from 100.degree. to 500.degree. C. and from 10 to 500 bar over a heterogeneous catalyst in which the catalytically active material contains from 20 to 85% by weight of ZrO.sub.2 or Al.sub.2 O.sub.3 or mixtures thereof, from 1 to 30% by weight of at least one copper oxide, calculated as CuO, and from 1 to 60% by weight of at least one oxide of cobalt, nickel or molybdenum, calculated as CoO, NiO and MoO.sub.3, respectively.

Preparation of N-(2-hydroxyethyl)-piperazine

In preparing or reacting alkanolamines, especially at high temperatures, the use of substantially nickel-free alloy steels prevents corrosion and discoloration.

Process and apparatus for preparing or reacting alkanolamines

Water-soluble, nitrogen-containing condensates are prepared by reacting a cross-linking agent, obtained by

Preparation of water-soluble, nitrogen-containing condensates and their

A process for the preparation of water-soluble polymeric crosslinking agents by a two-stage reaction of di-secondary diamines with epichlorohydrin and/or dichlorohydrin, wherein, in the first stage, di-secondary diamines are condensed with epichlorohydrin and/or dichlorohydrin in a molar ratio of from 1:0.5 to 1:1 at a pH of from 9 to 12, and in the second stage the condensates obtained in the first stage are reacted with additional epichlorohydrin and/or dichlorohydrin at a pH of from 4 to 8.5. The water-soluble condensates thus obtained are crosslinking agents for polyamines, polyamidoamines, ethyleneimine-modified polyamidoamines and polyether-amines. The crosslinking reaction gives water-soluble condensates, which possess a high cation activity and may be used as retention aids, drainage aids and flocculants in the manufacture of paper.

Preparation of water-soluble condensates and their use as crosslinking

A vulcanization activator which comprises a condensation product of ethylenediamine or propylenediamine with a low molecular weight aldehyde.

Vulcanization activator

Crosslinked water-soluble reaction products for the papermaking industry obtained by reacting

Incorporating a crosslinked polyamidoamine condensation product into

Production of water-soluble crosslinked auxiliaries for the papermaking industry by reacting

Nitrogenous condensation products used as retention aids in papermaking

Process for the manufacture of surface-sized papers by impregnating a paper with a solution containing a water-soluble salt of a random polymer based on .alpha.-olefins and ethylenically unsaturated acids and a compound of the formula: ##EQU1## wherein R is alkyl, aryl or a radical of the formula: ##EQU2## and R.sup.1 and R.sup.2 each independently denotes H, R or a radical of the formula:

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Ludwigshafen, Germany

Emil Scharf