Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Reexamination Certificate
2001-09-10
2003-04-15
Delcotto, Gregory (Department: 1751)
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
C134S022180, C134S026000, C134S041000, C134S042000, C510S218000, C510S219000, C510S477000, C510S488000, C510S499000
Reexamination Certificate
active
06546940
ABSTRACT:
FIELD OF THE INVENTION
The present invention is directed to a cleaning composition. Particularly, the invention is directed to a composition that comprises a chelating agent whereby the composition unexpectedly displays superior cleaning results even when the chelating agent is substantially biodegradable. Such a cleaning composition may further comprise an oxidizing agent, especially when it is desired to clean equipment contaminated with thermally degraded soil.
BACKGROUND OF THE INVENTION
It is extremely important, for example, to clean food and beverage processing facilities like breweries, carbonated beverage plants, and especially, dairy plants. Typically, such processing facilities are cleaned by subjecting the internal and/or external portions of the machines that make up the facilities to a solution that reacts with the various soils present within the machines. Also, it is often very desirable to clean the processing facilities (i.e., plants) themselves with open plant cleaning equipment and technologies.
A cleaning-in-place (CIP) system, for example, is a cleaning system which is often preferred when cleaning, disinfecting and sanitizing equipment employed in processing facilities. Such a CIP system typically comprises several storage containers that independently house solutions, like a pre-rinse solution, cleaning solution and a post-rinse solution. Often, these types of solutions are pre-pumped into the gas and liquid passages of the machines being cleaned and then are circulated through the machines until they are finally discharged to waste or recovered for subsequent cleaning cycles.
Conventional CIP compositions typically comprise chelators like EDTA. EDTA, however, is not readily biodegradable and thereby is known to cause a release of heavy metals when discharged into the environment, particularly streams. Other CIP compositions utilize methylglycine diacetic acid (MGDA) in lieu of EDTA. MGDA is more biodegradable than EDTA; however, CIP compositions comprising MGDA do not display favorable cleaning results in environments having thermally degraded lipid- and/or protein-comprising soils.
It is of increasing interests to prepare a composition that comprises environmentally friendly additives and is effective at cleaning soils like those found in processing facilities. This invention, therefore, is directed to a composition for removing soil wherein the composition comprises a chelating agent, and optionally, an oxidizing agent, and the composition is environmentally friendly and unexpectedly displays superior cleaning results, including lipid-comprising soil removal, or protein-comprising soil removal, or both.
ADDITIONAL INFORMATION
Efforts have been disclosed for cleaning processing equipment. In U.S. Pat. No. 5,888,311, a process for cleaning equipment in the absence of a pre-rinse step is described.
Other efforts have been disclosed for cleaning equipment. In World Patent Application WO 97/21797, a cleaning-in-place composition with methylglycine diacetic acid is disclosed.
Still other efforts have been disclosed for cleaning equipment. In U.S. Pat. No. 5,064,561, a CIP system with an alkaline material and an enzyme is described.
SUMMARY OF THE INVENTION
In a first embodiment, the present invention is directed to a composition for removing soil from a hard surface, the composition comprising:
(a) a carboxylated imino compound; and
(b) water
wherein
(i) the composition is not used in a dishwasher; and
(ii) the soil is soil generated at a food, beverage or dairy processing facility, and not soil recovered from a petroleum processing facility.
In a second embodiment, the present invention is directed to a composition for removing soil from a hard surface, the composition comprising:
(a) a carboxylated imino compound;
(b) water; and
(c) an oxidizing agent.
In a third embodiment, the present invention is directed to a method for using the composition of the first or second embodiment of this invention.
In a fourth embodiment the present invention is directed to a kit comprising:
(a) a first composition comprising a carboxylated imino compound;
(b) a second composition comprising an oxidizing agent; and
(c) instructions to utilize component (a) and (b) on thermally degraded soil, especially thermally degraded soil comprising thermally degraded protein-comprising soil, thermally degraded lipid-comprising soil, milkstone or combinations thereof.
As used herein, Portion I of the composition for removing soil is defined to mean a portion or first composition not comprising oxidizing agent, and Portion II of the composition for removing soil is defined to mean a portion or second composition not comprising carboxylated imino compound. Composition for removing soil is defined to mean a composition comprising carboxylated imino compound and water, including a composition comprising Portion I, or a composition comprising a mixture of Portion I and Portion II.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The only limitations with respect to the carboxylated imino compound that may be used in this invention is that the carboxylated imino compound can aid in the removal of lipid- and/or protein-comprising soils in food and beverage processing facilities.
Often, the carboxylated imino compound which may be used in this invention has the general formula:
wherein each A is independently a diacid group like an oxalic, malonic, succinic, glutaric, adipic or pimelic acid group, and R is hydrogen, a C
1-6
alkyl or aryl. In a preferred embodiment, however, each A is a succinic acid group and R is hydrogen.
The carboxylated imino compounds employable in the present invention may be made, for example, by treating an anhydride with water (e.g., to produce the diacid) and subjecting the resulting diacid to ammonia and sodium hydroxide to produce the desired carboxylated imino compound. Also, it is noted herein that it is within the scope of this invention to employ salts of carboxylated imino compounds.
In a most preferred embodiment, the carboxylated imino compound used in this invention is a salt and made with maleic anhydride as the precursor. Such a preferred compound is typically identified as D, L-aspartic acid, N-(
1
,
2
-dicarboxyethyl), tetrasodium salt, and sold under the name Baypure (iminodisuccinic acid sodium salt) by Bayer.
Regarding the amount of carboxylated imino compound that may be used in this invention, often from about 0.1% to about 60.0%, and preferably, from about 0.2% to about 30.0%, and most preferably, from about 20.0% to about 40.0% by weight of carboxylated imino compound is used, based on total weight of Portion I of the composition for removing soil, including all ranges subsumed therein. The balance of Portion I comprises water.
When it is desired to utilize an oxidizing agent (i.e., when a thermally degraded soil is targeted for removal), any oxidizing agent may be used as long as the agent enhances cleaning with the carboxylated imino compound. Such an oxidizing agent includes hydrogen peroxide, peroxyacids (like peracetic acid), ozone and chlorine dioxide. The amount of oxidizing agent used is often from about 0.01% to about 60.0%, and preferably, from about 0.05% to about 40.0%, and most preferably, from about 0.08% to about 30.0% by weight of oxidizing agent, base on total weight of Portion II of the composition for removing soil, including all range subsumed therein. The balance of Portion II is preferably water.
When preparing Portion I, or Portion II, or the composition for removing soil, each ingredient (component of the respective composition) may be added to a mixing vessel and stirred under conditions of moderate shear. There is no limitation with respect to the temperature and pressure at which the mixing occurs as long as the desired compositions may be made. Typically, however, the compositions are made at ambient temperature and at atmospheric pressure.
It is within the scope of this invention to utilize as the composition for removing soil only Portion I; therefore, the composition for removing soil will comprise a carboxylat
Crawford Charles Allen
Grober Stefan
Hilarides Jim Joseph
Rouillard Carol Anne
Schording Roland
Bovee Warren R.
Delcotto Gregory
Hamilton Neil E.
JohnsonDiversey, Inc.
Rymarz Renee J.
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