Process for removing starch-containing contamination from dishes

Details Process for removing starch-containing contamination from dishes Process for removing starch-containing contamination from dishes

1993-10-01

1995-03-21

Lieberman, Paul

Compositions

Water-softening or purifying or scale-inhibiting agents

252DIG12, 252542, 435188, 435219, 134 252, C11D 3386

Patent

active

053992849

DESCRIPTION:

BRIEF SUMMARY
Process for removing starch-containing contamination from dishes and surfactant concentrates suitable for this process
The invention relates to a process for removing, in particular, starch-containing contamination from dishes in dishwashers comprising the steps of: between ambient temperature and about 60.degree. C. for a period of time in the range from 5 to 300 seconds, compatible with the surfactant of the concentrated surfactants solution and rinsing clean.
In the foodstuffs processing sector of industry, including the kitchen sector, more or less alkaline detergent formulations which, in addition to the builder substances usually present, contain oxidising agents in the form of peroxides or active chlorine compounds are employed for mechanical cleaning of dishes. The known detergents have the common factor that because of their alkaline formulation, they cause pollution of the waste water. However, detergent solutions which are in some cases highly alkaline are required specifically for cleaning dishes with starch-containing contamination, since the action times provided in modern dishwashers are very short. Nevertheless, the cleaning quality which can be achieved with these detergent solutions is unsatisfactory; although it is possible to remove the majority of the starch-containing contamination, a thin deposit of starch-containing material often remains on the dishes, which, as the length of time over which the dishes are used increases, can no longer be removed by the route of customary cleaning of dishes. This also applies to those processes in which the precleaned dishes are sprayed directly with relatively highly dosed alkaline detergents, which is followed by an action time which can be several seconds to several minutes. Furthermore, the presence of concentrated alkaline solutions in dishwashers intended for this purpose results in a not inconsiderable potential hazard to the operating staff.
The invention accordingly relates to a process of the abovementioned type, in which contamination, in particular starch-containing contamination, which results in kitchens, can be removed effectively without the abovementioned deposits forming, although a concentrated surfactant solution having a pH in the weakly acid to weakly alkaline range is used in this process.
This object is achieved according to the invention by a process in which the concentrated surfactant solution used is an aqueous solution which contains kilo-Novo units of one amylase or more per l of surfactant solution, thickeners, preservatives and hardness-dispersing agents.
The N-C.sub.8 to C.sub.12 -alkylpyrrolidones contained in the concentrated surfactant solutions to be used according to the invention, in particular those having straight-chain alkyl groups, are commercially available compounds which have hitherto been employed mainly as surface-active agents in cosmetics formulations.
The proteases and/or (preferably) amylases to be employed according to the invention, which can be added individually or as a mixture, are commercially available enzyme systems.
As solubilising agents to be employed in the surfactant solutions to be used according to the invention, there may be mentioned in particular short-chain sulphonates and sulphates, which are likewise known compounds.
Typical examples of foam suppressants which are to be added to the surfactant concentrates of the invention, if appropriate, are biologically degradable adducts of ethylene oxide and propylene oxide on fatty alcohols having turbidity points in water of .ltoreq.50.degree. C., or of propylene oxide on fatty alcohols. Ethylene oxide/propylene oxide adducts on fatty alcohols which are commercially available block adducts of a numerical average of 2 to 5 mol of ethylene oxide and 2 to 4 mol of propylene oxide on 1 mol of fatty alcohols having 12 to 18, in particular 12 to 14, carbon atoms are particularly preferred; the surfactant concentrates can contain them in an amount of 1 to 3% by weight. The abovementioned foam suppressants are commercially available compounds w

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