Degussa Aktiengesellschaft

Degussa - Huls Ag

Degussa-huls-aktiengesellshaft

Michael Huss

Reinhard Stober

Wolfgang Fischer

Rainer Fuchs

Reimund Pieter

Dietmar Bischoff

Roland Schneider

Klaus Udluft

Peter Werle

Andrea Preuss

Gert Roessler

Birgit Del Grosso

Thomas Luy

A process for preventing the transfer of harmful organisms of zooplankton including the epifauna thereof and of phytoplankton including its resting stages, which are taken up with the ballast water of ships and transferred to another locality on discharge. The organisms are substantially destroyed by the addition of an agent containing a water-soluble percarboxylic acid with 1 to 6 carbon atoms, particularly an aqueous solution containing peracetic acid and/or performic acid and hydrogen peroxide, in a quantity of 0.1 to 200 mg of percarboxylic acid per liter of ballast water and allowing it to react before discharge. In a preferred embodiment, cyanide is also added to the ballast water.

Process for preventing contamination of the aquatic environment with organisms from ballast water

Disinfecting agents according to the invention with a high microbiocidal effect contain up to 5 wt. % performic acid, hydrogen peroxide and peracetic acid. The agents can be obtained by addition of a source of formic acid such as formic acid, a water-soluble salt of the same or a lower formic ester, to an aqueous phase containing 5 to 50 wt. % hydrogen peroxide and 1 to 15 wt. % peracetic acid and, in the case of the addition of a salt, additionally a mineral acid. Preferred agents result from the addition of 0.1 to 1 mole sodium formate or formic acid, per kg of the agent to be produced, to an equilibrium peracetic acid containing mineral acid with 0.5 to 6 wt. % peracetic acid.

Aqueous disinfecting agent containing performic acid and peracetic acid process for production and process for use thereof

Small creatures from the group of insects and worms which are pathogenic to humans, animals and plants can be controlled effectively by applying or introducing an aqueous percarboxylic acid solution containing one or more percarboxylic acids with 1 to 6 carbon atoms to surfaces and/or into water. A solution which contains peracetic acid and/or performic acid is preferably used. In the case of insects, the larvae of these are controlled in water using an application concentration of 1 to 5000 ppm of percarboxylic acid.

Process for controlling and destroying pathogenic small creatures, in particular insects and worms

A method of treating water for a swimming pool comprising chlorination of the water, and filtration of the water using a fixed-bed filter with periodic backflushing of the filter using wash water to which a disinfectant has been added. The disinfectant is a peroxycarboxylic acid with one to six carbon atoms is used as disinfectant, preferably a solution containing peroxyacetic acid and/or peroxyformic acid and hydrogen peroxide. The method results in an improvement of the quality of the swimming-pool water and of the used wash water.

Method of treating swimming pool water

The phytotoxic action of too high a concentration of peroxygen compounds such as peroxycarboxylic acids and hydrogen peroxide in the combating of phytopathogenic microorganisms, such as fusaria, in the water systems of plant irrigation systems, especially greenhouses, can be eliminated. The water is treated with a peroxycarboxylic acid solution which is brought in contact with a solid decomposition catalyst for active-oxygen compounds before the water is used for irrigation, in order to reduce the content of peroxycarboxylic acid and hydrogen peroxide. The water contacts and flows through a fixed bed of decomposition catalyst, by trickling over it or flowing through the conduits of a monolithic block coated with a decomposition catalyst such as platinum, palladium or rhodium.

Method of combating phytopathogenic microorganisms in the water circuits

Process for disinfecting aqueous solutions

The invention relates to a method of preparing an adjustable-viscosity cationized starch in which, in a process step in the presence of 10 to 35 wt. % water and preferably 0.01 to 2.00 wt. % of a finely-divided silica and/or silicate (in each case relative to the total amount of mixture) the starch is homogenized with an alkaline oxide, hydroxide, silicate aluminate or mixtures thereof, an alkylene epoxide and a peroxo compound or a mixture of at least two peroxo compounds and then boiled in known manner at the desired time.

Method of manufacturing an adjustable-viscosity cationic starch

A method for the dry cationization of starch is disclosed by means of reaction with alkylene epoxides in an alkaline medium in the presence of water.

Method for the dry cationization of starch II

A method is disclosed for the dry cationization of galactomannans by means of reaction with alkylene epoxides in an alkaline medium in the presence of water at 5.degree. to 60.degree. and in the presence of a finely divided, hydrophilic silica.

Method for the dry cationization of galactomannans (II)

A method for preparing cellulose ethers containing tertiary or quaternary nitrogen by reacting alkylene epoxides with cellulose or its derivatives in an alkaline medium in the presence of water. Alkylene epoxides of the formulas ##STR1## or mixtures thereof, in which n=1, 2 or 3, R.sup.1, R.sup.2 and R.sup.3 correspond to the same or different alkyl groups with 1 to 18 carbon atoms or R.sup.1 corresponds to the benzyl group or --C.sub.2 H.sub.4 OH and X is chloride, bromide, sulfate or acetate are used as cationization agents.

Method of preparing cellulose ethers containing tertiary or quaternary

A dry process for preparation of cationic starch ethers by reaction of starch with alkylidene epoxides in the presence of water in an alkaline medium at a temperature of 5.degree. to 40.degree. C. in the presence of a finely divided silica.

Process for dry cationization of starch

A process for the dry cationization of galactomannans by reaction with alkylidene epoxides in an alkaline medium in the presence of water at 5.degree. to 60.degree. C. and in the presence of finely divided, hydrophilic silicic acid.

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Eschborn, Germany

Michael Huss