Henkel Kommanditgesellschaft Auf Aktien

Guenter Panthel

Wolfgang Schmidt

Dietmar Colignon

Norbert Wrede

Erich Dorra

Karl Heinz Schmid

Bernhard Gutsche

Robert Piorr

Hans J Rommerskirchen

Christoph Breucker

Horst Ritterbex

Jochen Jacobs

Lutz Jeromin

Volker Bauer

Eberhard Peukert

Gerhard Blasey

Thomas Lueder

Herbert Lepper

Francois Pierron

In the production of granules containing anionic surfactants and having a bulk density above 450 g/l by granulation of a surfactant preparation containing a non-surface-active liquid component, the water demand and hence the energy demand for evaporating the water can be reduced if the anionic surfactant in its acid form or a mixture containing one or more anionic surfactants in their acid form and an aqueous alkaline solution are separately treated with a gaseous medium, subsequently sprayed in substantially stoichiometric quantities into the granulation and drying zone either separately or together under a high propellant gas pressure and then granulated and, at the same time, dried, optionally with addition of one or more inorganic or organic solids.

Process for the production of surfactant granules

Process for the production of highly concentrated pastes of

Process for the production of light-colored pastes of .alpha.-sulfofatty

Process for the production of light-colored .alpha.-sulfofatty acid

A process for the production of solid or paste-form products by fast reactions is carried out stoichiometrically wherein a gaseous medium is introduced into each of the reactants to be reacted with one another, the reactant streams formed are combined and are subsequently forced through a spray unit in a weight ratio of gaseous medium to product stream of from 0.04 to 0.3 (kg/kg) and at a rate of 0.1 to 15 m/second, as calculated from the gas-free reactant streams and based on the free cross-section of the spray unit. The products obtained are free from readily volatile constituents.

Process for the production of solid or paste-form products

In light colored surfactants produced by sulfonation of fatty acid alkyl esters with less than 2 moles of SO.sub.3 per mole of fatty acid alkyl ester and subsequent work-up of the crude sulfonate in aqueous medium to form salts, the content of .alpha.-sulfofatty acid disalts is regulated and reduced by transesterifying the sulfonation product before its treatment with an aqueous medium with at least about 0.5 mole equivalent of an alcohol, based on the SO.sub.3 which is not for .alpha.-sulfonation.

Control of disalt in .alpha.-sulfofatty acid ester surfactants

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Guenter Panthel