Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2003-05-30
2004-11-09
Del Cotto, Gregory R. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S191000, C510S392000, C510S393000, C510S435000, C510S499000, C210S601000, C210S606000, C210S636000
Reexamination Certificate
active
06815404
ABSTRACT:
The invention relates to a cleaning agent, particularly or cleaning sewers, for fat containing and/or protein-containing sewage from the home or having a municipal or industrial origin having a content of urea, a urea derivative, a urea salt and/or a urea derivative salt.
A process of the aforementioned type is disclosed in EP-B-236 989, which prescribes the use of supplines, e.g. in the form of nitrogen-containing compounds. This known proposal is based on the finding that microorganisms are frequently so specialized that they require supplines for life. Supplines are essential substances belonging to the elementary constituents of the cell and which cannot be synthesized by individual organisms. They are e.g. amino acids, purines, pyrimidines, organic acids, carbohydrates, together with vitamins, particularly phenyl alanine, arginine, aspartic, oxalic, malic, malonic and propionic acids. With regards to their function and concentration, supplines differ clearly from nutrients. They correspond to vitamins in the animal and human diet. As nutrients, which fundamentally differ from supplines, the following compounds can be given: ammonium, nitrate and phosphate ions, glucose, polysaccharide, proteins and carbohydrates. For cleaning sewers for fat-containing sewage from the home or industrial enterprises the supply of supplines for fat-degrading or emulsifying bacteria prevents the formation of a plug in the sewer or if a plug of this type has already formed, easily brings about the dissolving thereof. Thus, according to the known proposal there is a biological decomposition of the fat through the bacteria present in the sewage. Suppline combinations for promoting fat-degrading or emulsifying bacteria are applied to the plug in the sewer either alone or combined with a detergent. The suppline combination permits a rapid growth of the desired bacteria, which leads to the dissolving of the disturbing fat plug in the sewer. The fat-degrading or emulsifying bacteria are constituted by a wide range of bacteria, which are normally present in the sewage. To promote the penetration of supplines into the fat plug and in order to assist the microbial dissolving of the fat, it is possible to add a detergent. The same purpose is served alone or in combination with the detergent, the addition of a CO2-developing powder, e.g. effervescing powder, which comprises approximately 50 wt. % sodium bicarbonate and approximately 50 wt. % tartaric acid.
The above proposal has proved very valuable in practice, but requires improvement. Another prior art process can be gathered from DE 44 17 809 A1. The latter describes a process for sanitary cleaning using a sanitary cleaner in liquid or solid form, which has a minimum content of germ-inhibiting, organic substances, together with conventional lime-dissolving, water-soluble acids, germ-promoting, organic substances and further additives and it contains e.g. urea as the germ-promoting, organic substance. This application discloses a two-stage action system, according to which in a first phase the germ-inhibiting substances and in a second phase the germ-promoting substances bring about the cleaning of the sewage.
EP 184 416 A2 discloses a cleaning block for toilets, which is dissolved in the water tank and has a composition of 5 to 85 wt. % of one or more anionic surfactants, 2 to 50 wt. % of one or more solubility control agents and 0.5 to 50 wt. % of at least one water-soluble, polyvalent metal salt, such as e.g. crystal water-containing magnesium sulphate.
PCT/EP 00/04135 offers a significant improvement compared with the above-described processes or cleaning agents. The teaching described therein seeks to improve the action on the sewer-blocking plug and parts thereof in such a way that there can be both an easier and faster physical and also biochemical dissolving of plugs or parts thereof in the sewer and sewage.
This prior art also provides a proposal in this direction. It consists of a process for cleaning sewers for fat-containing sewage from the home or industrial enterprises, in which to the fat-degrading and/or fat-emulsifying bacteria contained in the sewage are added nitrogen-containing compounds and which is characterized in that 1. to a liquid effluent cleaner are additionally added urea, a urea derivative, a urea salt and/or a urea derivative salt and 2. to a solid effluent cleaner are additionally added urea, a urea derivative, a urea salt and/or a urea derivative salt and/or anhydrous magnesium sulphate, growth factors in the form of supplines being largely excluded, and in 1. and 2. the quantity of germ-inhibiting, organic substance is below 0.5 g/kg, preferably below approximately 0.3 g/kg, particularly below approximately 0.1 g/kg sewer effluent cleaner. Preferably urea is used, particularly in a quantity of 0.1 to 20 wt. %, based on the solid content. Use can advantageously also be made of urea phosphate, particularly in a quantity of 0.2 to 40 wt. %, based on the solid content. It is generally stated that fat, protein and carbohydrate-degrading enzymes and/or microorganisms can be used.
However, it is a particular characteristic of this proposal that not only are growth factors in the form of supplines largely excluded, but that in a solid sewer cleaner the quantity of germ-inhibiting, organic substances must be below 0.5 g/kg, particularly below 0.3 g/kg and more especially below 0.1 g/kg effluent cleaner. These are in particular acid, organic substances or their salts or suitable derivatives and essential oils. These more particularly include aliphatic carboxylic acids, lower carboxylic acids with 1 to 7 carbon atoms, such as more particularly formic, acetic, propionic, caproic, malonic and oxalic acids, as well as various fatty acids with 6 to 12 carbon atoms, e.g. sorbic acid or undecenoic acid, provided that they are usable in the form of suitable, water-soluble salts. Suitable derivatives of the aforementioned carboxylic acids are hydroxy acids, such as glycolic, tartaric and citric acids, as well as oxo acids, such as acetoacetic and pyruvic acids. Particularly suitable are also adequately water-soluble, aromatic carboxylic acids, such as in particular benzoic, salicylic and also other phenocarboxylic acids. Thus, the proposal of PCT/EP 00/04135 aims to exclude such germ-inhibiting, organic substances. This does not apply to the subsequently described cleaning agent according to the invention. It has been found that the last-described, technical proposal for cleaning sewers requires improvement and in particular an improved plug dissolving capacity must be sought.
Therefore the object of the invention is a cleaning agent, particularly for cleaning sewers, for fat and/or protein-containing sewage from the home or having a municipal or industrial origin and having a content of urea, a urea derivative, a urea salt and/or a urea derivative salt, which is characterized in that the cleaning agent contains approximately 50 to 90 wt. % urea, urea derivative, urea salt and/or urea derivative salt, based on dry substance, and an alkaline-acting agent, protease and fat-degrading microorganisms.
Thus, in complete contradiction to the procedure according to the prior art, the agent according to the invention uses an unusually high proportion of urea, urea derivative, urea salt and/or urea derivative salt, based on dry substance, namely approximately 50 to 90, preferably approximately 60 to 80 and in particular approximately 65 to 75 wt. %. The urea is not only germ-promoting during the targeted use of the cleaning agent according to the invention, but also acts in solubility-increasing manner for the inventively used proteases and also acts as a nitrogen source for the fat-degrading bacteria. It also has a dissolving function on proteins which may have to be removed. The germ-promoting, organic substance in the form of urea or urea derivative can fundamentally be an open-chain or cyclic compound of formula (I) R1R2N—CO—NR3R4, in which R1 to R4, in each case independently of one another, can be present in open-chain or cyclized form and
BBT Bergedorfer Biotechnik GmbH
Darby & Darby
Del Cotto Gregory R.
LandOfFree
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