Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Heterogeneous arrangement
Patent
1998-03-12
2000-02-29
Kopec, Mark
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Heterogeneous arrangement
510470, 510501, C11D 166, C11D 1825, C11D 183
Patent
active
060309377
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a process for the production of sugar surfactant granules in which aqueous sugar surfactant pastes are subjected to granulation in the presence of selected silicon compounds.
PRIOR ART
Sugar surfactants, for example, alkyloligoglucosides and fatty acid N-alkyl glucamides, are distinguished by excellent detergent properties and high ecotoxicological compatibility. For this reason, these classes of nonionic surfactants are acquiring increasing significance. Although they have heretofore generally been used in liquid formulations, for example, dishwashing detergents and hair shampoos, there is now also a market need for solid water-free formulations which may even be incorporated, for example, in powder-form detergents.
In general, liquid surfactant formulations are industrially dried by conventional spray drying in which the aqueous surfactant paste is sprayed at the head of a tower in the form of fine droplets against which hot drying gases are passed in countercurrent. Unfortunately, this technology cannot readily be applied to sugar surfactant pastes because the temperatures required for drying are above the caramelization temperature, i.e., the decomposition temperature, of the sugar surfactants. In short, carbonized products are obtained in the conventional drying of sugar surfactant pastes, in addition to which caking occurs on the walls of the spray-drying tower and necessitates expensive cleaning at short intervals.
Attempts have been made in the past to overcome this problem. For example, German patent application DE-A1 41 02 745 (Henkel) describes a process in which a small quantity (1 to 5 weight %) of alkylglucoside is added to a fatty alcohol paste which is then subjected to conventional spray drying. Unfortunately, this process can only be carried out in the presence of a large quantity of inorganic salt. According to German patent application DE-A1 41 39 551 (Henkel), a paste of alkyl sulfate and alkylglucoside, which may only contain at most 50 weight % of the sugar surfactant, is sprayed in the presence of a mixture of soda and zeolite. However, this only gives compounds which have a low surfactant concentration and an inadequate apparent density. International patent application WO 95/14519 (Henkel) describes a process in which sugar surfactant pastes are subjected to drying with superheated steam. Unfortunately, this process is industrially very expensive. German patent application DE-A1 42 09 339 (Henkel) relates to a process for dewatering aqueous formulations of alkylglucoside and inorganic salt, for example, zeolite or water glass, in a horizontal turbine dryer with rotating baffles. The resulting solids have a high surfactant content, but the apparent density is comparatively low and the dissolution rate is unsatisfactory. German patent application DE-A1 40 21 476 describes the granulation of aqueous alkylglucoside pastes in a mixer with the addition of soda. However, the resulting water-containing granules have a surfactant content less than 50 weight % and must be dried in a second step in a fluidized bed.
Accordingly, the complex problem addressed by the present invention was to provide a simple process for the production of sugar surfactant granules that would be distinguished by their high surfactant content, a high apparent density, ready solubility even in cold water and good color quality and which, at the same time, would be dust-dry, free-flowing and stable in storage.
DESCRIPTION OF THE INVENTION
The present invention relates to a process for the production of sugar surfactant granules having a sugar surfactant content of 30 to 90 weight %, preferably 50 to 85 weight %, and particularly 70 to 80 weight %, in which an aqueous paste of optionally with simultaneous or subsequent drying.
It has surprisingly been found that use of the specified silicon compounds as a support substance provides granules with an unexpectedly high apparent density in the range from 500 to 1000 g/l and a sugar surfactant content from 30 to 90 w
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Assmann Georg
Bauer Volker
Kruse Hans-Friedrich
Drach John E.
Hardee John R.
Henkel Kommanditgesellschaft auf Aktien
Kopec Mark
Ortiz Daniel S.
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