WO2010147485A1 - Acid cleaning composition - Google Patents
Acid cleaning composition Download PDFInfo
- Publication number
- WO2010147485A1 WO2010147485A1 PCT/NZ2010/000113 NZ2010000113W WO2010147485A1 WO 2010147485 A1 WO2010147485 A1 WO 2010147485A1 NZ 2010000113 W NZ2010000113 W NZ 2010000113W WO 2010147485 A1 WO2010147485 A1 WO 2010147485A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- cleaning composition
- weight
- acid cleaning
- total
- Prior art date
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- 239000002253 acid Substances 0.000 title claims abstract description 181
- 239000000203 mixture Substances 0.000 title claims abstract description 171
- 238000004140 cleaning Methods 0.000 title claims abstract description 107
- 150000007524 organic acids Chemical class 0.000 claims abstract description 75
- 150000007513 acids Chemical class 0.000 claims abstract description 32
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 150000001735 carboxylic acids Chemical class 0.000 claims abstract description 19
- 230000001747 exhibiting effect Effects 0.000 claims abstract description 19
- 235000014666 liquid concentrate Nutrition 0.000 claims abstract description 5
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 117
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 51
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical group OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 39
- 235000006408 oxalic acid Nutrition 0.000 claims description 39
- 150000001875 compounds Chemical class 0.000 claims description 28
- 239000004599 antimicrobial Substances 0.000 claims description 27
- 239000004094 surface-active agent Substances 0.000 claims description 23
- 235000008504 concentrate Nutrition 0.000 claims description 21
- 239000012141 concentrate Substances 0.000 claims description 21
- 239000003085 diluting agent Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 18
- 150000007522 mineralic acids Chemical class 0.000 claims description 17
- 235000013365 dairy product Nutrition 0.000 claims description 14
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 11
- 150000003856 quaternary ammonium compounds Chemical class 0.000 claims description 11
- 230000000845 anti-microbial effect Effects 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 10
- 229940027983 antiseptic and disinfectant quaternary ammonium compound Drugs 0.000 claims description 9
- -1 carbon atoms ammonium chlorides Chemical class 0.000 claims description 9
- 235000013305 food Nutrition 0.000 claims description 9
- 235000019270 ammonium chloride Nutrition 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 235000011149 sulphuric acid Nutrition 0.000 claims description 7
- RUPBZQFQVRMKDG-UHFFFAOYSA-M Didecyldimethylammonium chloride Chemical group [Cl-].CCCCCCCCCC[N+](C)(C)CCCCCCCCCC RUPBZQFQVRMKDG-UHFFFAOYSA-M 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical class OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- CADWTSSKOVRVJC-UHFFFAOYSA-N benzyl(dimethyl)azanium;chloride Chemical compound [Cl-].C[NH+](C)CC1=CC=CC=C1 CADWTSSKOVRVJC-UHFFFAOYSA-N 0.000 claims description 6
- 229960004670 didecyldimethylammonium chloride Drugs 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 235000012206 bottled water Nutrition 0.000 claims description 5
- 238000007865 diluting Methods 0.000 claims description 5
- 239000003651 drinking water Substances 0.000 claims description 5
- JMHWNJGXUIJPKG-UHFFFAOYSA-N CC(=O)O[SiH](CC=C)OC(C)=O Chemical compound CC(=O)O[SiH](CC=C)OC(C)=O JMHWNJGXUIJPKG-UHFFFAOYSA-N 0.000 claims description 4
- 125000000217 alkyl group Chemical group 0.000 claims description 4
- SCXCDVTWABNWLW-UHFFFAOYSA-M decyl-dimethyl-octylazanium;chloride Chemical compound [Cl-].CCCCCCCCCC[N+](C)(C)CCCCCCCC SCXCDVTWABNWLW-UHFFFAOYSA-M 0.000 claims description 4
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 3
- 125000004432 carbon atom Chemical group C* 0.000 claims description 3
- 238000007046 ethoxylation reaction Methods 0.000 claims description 3
- 150000008040 ionic compounds Chemical class 0.000 claims description 3
- 229920000847 nonoxynol Polymers 0.000 claims description 3
- 125000001453 quaternary ammonium group Chemical group 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 2
- 229920001400 block copolymer Polymers 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 34
- 238000009472 formulation Methods 0.000 description 19
- 239000000243 solution Substances 0.000 description 18
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 14
- 235000005985 organic acids Nutrition 0.000 description 14
- 235000015165 citric acid Nutrition 0.000 description 12
- 239000000126 substance Substances 0.000 description 12
- 230000008901 benefit Effects 0.000 description 11
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 239000002689 soil Substances 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000006260 foam Substances 0.000 description 9
- 241000196324 Embryophyta Species 0.000 description 8
- 238000010790 dilution Methods 0.000 description 8
- 239000012895 dilution Substances 0.000 description 8
- 235000013336 milk Nutrition 0.000 description 8
- 239000008267 milk Substances 0.000 description 8
- 210000004080 milk Anatomy 0.000 description 8
- 235000011007 phosphoric acid Nutrition 0.000 description 8
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 6
- 238000011109 contamination Methods 0.000 description 6
- 238000011282 treatment Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- 230000000813 microbial effect Effects 0.000 description 5
- 244000005700 microbiome Species 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 229910019142 PO4 Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 125000002091 cationic group Chemical group 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 4
- 239000003599 detergent Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 235000021317 phosphate Nutrition 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000001117 sulphuric acid Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 238000007792 addition Methods 0.000 description 3
- 150000001412 amines Chemical class 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000012153 distilled water Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 239000008233 hard water Substances 0.000 description 3
- 239000003446 ligand Substances 0.000 description 3
- 239000002736 nonionic surfactant Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- JUSZROWIGBIXOS-UHFFFAOYSA-N 1-(dimethylamino)propan-2-ol;hydrochloride Chemical compound [Cl-].CC(O)C[NH+](C)C JUSZROWIGBIXOS-UHFFFAOYSA-N 0.000 description 2
- ZHEAGHDYRNYMPX-UHFFFAOYSA-N 2,2-dihydroxyethyl-methyl-[3-(11-methyldodecoxy)propyl]azanium;chloride Chemical compound [Cl-].CC(C)CCCCCCCCCCOCCC[NH+](C)CC(O)O ZHEAGHDYRNYMPX-UHFFFAOYSA-N 0.000 description 2
- JTMASPCMASTAOZ-UHFFFAOYSA-N 2,2-dihydroxyethyl-methyl-[3-(8-methylnonoxy)propyl]azanium;chloride Chemical compound [Cl-].CC(C)CCCCCCCOCCC[NH+](C)CC(O)O JTMASPCMASTAOZ-UHFFFAOYSA-N 0.000 description 2
- SVTBMSDMJJWYQN-UHFFFAOYSA-N 2-methylpentane-2,4-diol Chemical compound CC(O)CC(C)(C)O SVTBMSDMJJWYQN-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical class O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 2
- 150000004985 diamines Chemical class 0.000 description 2
- 239000012470 diluted sample Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- 239000003995 emulsifying agent Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- CTSLXHKWHWQRSH-UHFFFAOYSA-N oxalyl chloride Chemical compound ClC(=O)C(Cl)=O CTSLXHKWHWQRSH-UHFFFAOYSA-N 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000005180 public health Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 239000003760 tallow Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 239000000080 wetting agent Substances 0.000 description 2
- 239000012224 working solution Substances 0.000 description 2
- ZTEHOZMYMCEYRM-UHFFFAOYSA-N 1-chlorodecane Chemical compound CCCCCCCCCCCl ZTEHOZMYMCEYRM-UHFFFAOYSA-N 0.000 description 1
- QFIYGEBLOSJFGJ-UHFFFAOYSA-N 2,2-dihydroxyethyl-methyl-octadecylazanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[NH+](C)CC(O)O QFIYGEBLOSJFGJ-UHFFFAOYSA-N 0.000 description 1
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- KBIWNQVZKHSHTI-UHFFFAOYSA-N 4-n,4-n-dimethylbenzene-1,4-diamine;oxalic acid Chemical compound OC(=O)C(O)=O.CN(C)C1=CC=C(N)C=C1 KBIWNQVZKHSHTI-UHFFFAOYSA-N 0.000 description 1
- 241000228212 Aspergillus Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- DORPKYRPJIIARM-UHFFFAOYSA-N Decaffeoylacteoside Natural products OC1C(O)C(O)C(C)OC1OC1C(O)C(OCCC=2C=C(O)C(O)=CC=2)OC(CO)C1O DORPKYRPJIIARM-UHFFFAOYSA-N 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- LOMVENUNSWAXEN-UHFFFAOYSA-N Methyl oxalate Chemical compound COC(=O)C(=O)OC LOMVENUNSWAXEN-UHFFFAOYSA-N 0.000 description 1
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 description 1
- 240000007019 Oxalis corniculata Species 0.000 description 1
- 235000016499 Oxalis corniculata Nutrition 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 241000219053 Rumex Species 0.000 description 1
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- 239000004280 Sodium formate Substances 0.000 description 1
- DORPKYRPJIIARM-GYAWPQPFSA-N Verbasoside Chemical compound O[C@@H]1[C@H](O)[C@@H](O)[C@H](C)O[C@H]1O[C@@H]1[C@@H](O)[C@H](OCCC=2C=C(O)C(O)=CC=2)O[C@H](CO)[C@H]1O DORPKYRPJIIARM-GYAWPQPFSA-N 0.000 description 1
- 125000003158 alcohol group Chemical group 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 238000009874 alkali refining Methods 0.000 description 1
- 150000003973 alkyl amines Chemical class 0.000 description 1
- 239000002168 alkylating agent Substances 0.000 description 1
- 229940100198 alkylating agent Drugs 0.000 description 1
- 125000002947 alkylene group Chemical group 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 229940111121 antirheumatic drug quinolines Drugs 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- QXDMQSPYEZFLGF-UHFFFAOYSA-L calcium oxalate Chemical compound [Ca+2].[O-]C(=O)C([O-])=O QXDMQSPYEZFLGF-UHFFFAOYSA-L 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 150000001728 carbonyl compounds Chemical class 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 150000001860 citric acid derivatives Chemical class 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000645 desinfectant Substances 0.000 description 1
- 230000000249 desinfective effect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
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- 239000000796 flavoring agent Substances 0.000 description 1
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- 235000019253 formic acid Nutrition 0.000 description 1
- 150000004674 formic acids Chemical class 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000013056 hazardous product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- ACGUYXCXAPNIKK-UHFFFAOYSA-N hexachlorophene Chemical class OC1=C(Cl)C=C(Cl)C(Cl)=C1CC1=C(O)C(Cl)=CC(Cl)=C1Cl ACGUYXCXAPNIKK-UHFFFAOYSA-N 0.000 description 1
- 229940051250 hexylene glycol Drugs 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000012678 infectious agent Substances 0.000 description 1
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- 238000005342 ion exchange Methods 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229940050176 methyl chloride Drugs 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002763 monocarboxylic acids Chemical class 0.000 description 1
- NYNKJVPRTLBJNQ-UHFFFAOYSA-N n'-(3-aminopropyl)-n'-dodecylpropane-1,3-diamine Chemical compound CCCCCCCCCCCCN(CCCN)CCCN NYNKJVPRTLBJNQ-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 150000002913 oxalic acids Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000001935 peptisation Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 238000009428 plumbing Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- VSRUWRBJHJVUDC-UHFFFAOYSA-L potassium;2-hydroxy-2-oxoacetate;iron(3+);oxalic acid Chemical group [K+].[Fe+3].OC(=O)C(O)=O.OC(=O)C([O-])=O.OC(=O)C([O-])=O VSRUWRBJHJVUDC-UHFFFAOYSA-L 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 150000004672 propanoic acids Chemical class 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000004076 pulp bleaching Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000012629 purifying agent Substances 0.000 description 1
- 150000003248 quinolines Chemical class 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 1
- 235000019254 sodium formate Nutrition 0.000 description 1
- 235000014214 soft drink Nutrition 0.000 description 1
- 239000008234 soft water Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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- NJRXVEJTAYWCQJ-UHFFFAOYSA-N thiomalic acid Chemical compound OC(=O)CC(S)C(O)=O NJRXVEJTAYWCQJ-UHFFFAOYSA-N 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
- C11D7/22—Organic compounds
- C11D7/26—Organic compounds containing oxygen
- C11D7/265—Carboxylic acids or salts thereof
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2075—Carboxylic acids-salts thereof
- C11D3/2086—Hydroxy carboxylic acids-salts thereof
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/48—Medical, disinfecting agents, disinfecting, antibacterial, germicidal or antimicrobial compositions
-
- C11D2111/20—
Definitions
- the invention relates to an acid cleaning composition. More specifically, the invention relates to an acid cleaning composition that utilises at least three organic acids which in combination act to provide strong cleaning activity and requires less acid concentration to achieve the same degree of cleaning effect as existing cleaning compositions.
- water alone acts as a good cleaning agent if enough external energy is put into the system.
- the primary constituent of all dairy plant cleaners is water. Pure water presents no problem, but no dairy plant supply water is ideal as the water may be hard, may contain traces of contaminants or may contain fouling substances such as suspended matter. Water alone is therefore not always the ideal cleaning solution.
- Cleaning compounds may be added to the water in order to decrease the external energy requirements by increasing the internal potential energy of the water. Addition of cleaning compounds also compensates for the above issues of water quality and in general avoids the need to individually tailor cleaning compounds for different water supplies as one compound can often be sufficient for a variety of applications.
- the compounds required for adequate cleaning of food plant equipment generally are complex mixtures of chemicals combined to achieve a specific purpose.
- Periodic cleaning and sanitising in dairy, food and beverage industries, in food preparation and service businesses are a necessary practice for product quality and public health. Residuals left on equipment surfaces or contaminants found in the process or service environment can promote the growth of micro-organisms.
- the antimicrobial efficacy of sanitising treatments is significantly reduced if the surface is not absolutely free of soil and other contaminants prior to the sanitising step.
- the presence of residual food soil and/or mineral deposits inhibits sanitising treatments by acting as physical barriers which shield micro-organisms lying within the organic or inorganic layer from the anti-microbial agent.
- chemical interactions between the anti-microbial agent and certain contaminants can disrupt the killing mechanism of the anti-microbial agent.
- sanitiser/disinfectant is based on properties which need to be considered including: to be non toxic when used properly; to be harmless to the applied surfaces; to be fast acting, even in presence of organic matter; to be effective against all types of infectious agents (broad spectrum); to easily penetrate the material to be disinfected; to be stable; and to be compatible with the cleaners , that are used.
- Acid type cleaners are routinely used in at least the dairy industry for milkstone removal and also as part of the cleaning process on high temperature heat exchange equipment.
- equipment in a dairy context that require cleaning include plate pasteurisers, tubular heaters, HTST pasteurisers, evaporators, UHT units, as well as in CIP cleaning of other milk processing and storage equipment.
- These types of equipment are routinely cleaned by a two- phase circulation system using an acid type cleaner in one phase. Using these cleaners allows for the removal of burnt on milk deposits thereby preventing milkstone formation.
- acid type cleaners are blends of organic acids, inorganic acids, or acid salts usually with the addition of wetting agent.
- acid type cleaners generally produce a pH of 3.0 or lower in the diluted solution.
- Other important characteristics of existing cleaners are that the cleaner should work well in hard as well as soft water and should show minimal corrosion on dairy plant metals. Acid cleaners also can combine the rinsing and sanitising steps.
- Acid detergents can be very effective in solutions where soils fail to respond to alkaline cleaners.
- acids have been employed as milkstone removers in the dairy industry.
- acids have been extensively used in the dairy plant sanitation program, especially for cleaning high-temperature processing equipment such as.
- Application of acid maintains the equipment surface free of mineral deposits and keeps stainless steel in good condition.
- acids are used as acidified rinses to ensure neutralisation of alkaline residues that may be left on equipment after insufficient rinsing of the alkaline cleaner.
- inorganic acids are phosphoric, sulphuric, hydrochloric and nitric acids which should be recognised as being strong and corrosive acids. These strong acids are normally combined with a mild or weak acid, for example phosphoric acid, to soften the strong acid corrosive effect.
- Organic acids such as acetic, peroxyacetic, lactic, propionic and formic acids are the most common acid sanitisers.
- Examples of such compositions include: Citra AcidTM manufactured by Epsilon Chemicals Ltd.; PerasanTM and Bioside HSTM manufactured by EnviroTech Chemicals, Inc.
- Organic acids also have the advantage that they are safer acid cleaners and they also have anti-microbial properties as well.
- a disadvantage though is that organic acids tend to be weaker than inorganic acid cleaners described above and therefore a greater concentration and/or volume of organic acid is required to achieve the cleaning levels desired.
- the most commonly used formulations of acid cleaners are based on inorganic acid mixtures. These mainly consist of two acids, one of which is a strong acid, for example sulphuric acid, and a second acid which is a mild or weak acid, for example phosphoric acid.
- the main disadvantages of such formulations are that they are highly corrosive and are considered as a possible source of water contamination.
- the inventors have found that by using a blend of organic acids with specific properties, it is possible to achieve excellent results in cleaning beyond that which was expected and avoid use of corrosive solutions and contamination sources. A further unexpected finding was that the specific combination of organic acids provided sufficient cleaning effects even when less (1/3rd less) concentrated than traditional acid cleaning solutions.
- an acid cleaning composition in the form of a stable liquid concentrate including at least 50% by weight of the following acids:
- the acids present in this invention are naturally occurring compounds, widely used in similar or other fields of application by themselves or as mixtures.
- organic acids are less corrosive, are not considered as a source of contamination of ground waters, safer to handle and transport, and show better performance.
- the organic acid with both alcohol and acid functionality may be glycolic acid.
- Glycolic acid has one of the smallest organic molecules with both acid and alcohol functionality, resulting in unique chemical attributes. Glycolic acid uses both the hydroxyl and carboxyl acid groups to form five-member ring complexes (chelates) with polyvalent metals. It readily forms typical salts with active metals, metal oxides and bases.
- the organic acid with chelating properties may be citric acid.
- Citric acid's ability to chelate metals makes it useful in soaps and laundry detergents. By chelating the metals in hard water, it lets these cleaners produce foam and work better without need for water softening.
- citric acid is used to regenerate the ion exchange materials used in water softeners by stripping off the accumulated metal ions as citrate complexes.
- the organic acid exhibiting reactions characteristic of carboxylic acids may be oxalic acid.
- Oxalic acid exhibits many of the reactions characteristic of other carboxylic acids.
- Oxalic acid also forms esters such as dimethyloxalate (melting point 52.5-53.5 0 C) and an acid chloride (oxalyl chloride).
- Oxalic acid or ethanedioic acid is a dicarboxylic acid and is present in many plants and vegetables, notably in those of the Oxalis and Rumex genera, where it often occurs in the cell sap of the plants as the potassium or calcium salt (oxalate).
- Oxalic acid is also a product of the metabolism of many mould fungi. Several species of Penicillum and Aspergillus convert sugar into calcium oxalate with a 90% yield under optimum conditions.
- Oxalic acid is also made by passing carbon monoxide into concentrated sodium hydroxide (NaOH) or heating sodium formate in the presence of NaOH.
- Oxalate the conjugate base of oxalic acid, is an excellent ligand for metal ions. It usually binds as a bidentate ligand forming a 5-membered MO 2 C 2 ring.
- An illustrative complex is potassium ferrioxalate, K 3 [Fe(C 2 O 4 ) 3 ].
- oxalic acid As a component for composition used for bleaching and washing animal tissue.
- 3,993,575 describes the possibility to use oxalic acid for removal of tenacious soil, such as tarnish, discoloration, corrosion and oxidation products from vehicles.
- One reference 1 shows use of oxalic acid as an efficient catalyst in the condensation of 2-aminoaryl ketones with carbonyl compounds leading to the formation of quinolines in excellent yields under solvent free conditions.
- Another reference 2 has shown, that oxalic acid can successfully be used to replace phosphoric acid for de-gumming vegetable oils with high phosphatide content prior to alkali refining, and as a result, alleviate the pollution problem with phosphate waste in cases where water purification by means of a chemical treatment process is not possible.
- the acid cleaning composition includes: (a) 10-90% total acid by weight organic acid with both alcohol and acid functionality;
- the term 'total acid' refers to the total concentration of acids in the composition. Further, the above concentration [%] for each component is calculated using the formula:
- organic acid with both alcohol and acid functionality may be glycolic acid included at a rate of about 30 to 80% total acid by weight, or about 35- 70% of total acid content by weight, or about 40-70% of total acid by weight, or most preferably, about 50-60% of total acid content by weight.
- the organic acid with chelating properties may be citric acid present in amounts of about 10-40% of total acid content by weight, or about 25- 37% of total acid content by weight, or more preferably in amounts of about 28- 35% of total acid content by weight.
- the organic acid exhibiting reactions characteristic of carboxylic acid is oxalic acid present in an amount of about 5-20% of total acid content by weight, or about 10-15% of total acid content by weight, or more preferably in amount about 10-12 % of total acid content by weight.
- the ideal composition in terms of cleaning capacity is determined in part by the oxalic acid concentration in the total composition.
- the oxalic acid concentration is about 2-7% by weight of total formulation calculated by the formula:
- Vocompositionoxalicacid 100 x
- the amount of oxalic acid is ideally about 5-6% by weight of total composition.
- the composition contains 40-70% glycolic acid, 28-35% citric acid and 2-7% oxalic acid by weight in the total composition.
- the acid cleaning composition has a ratio of acids approximate to:
- the acid cleaning composition has a ratio of acids approximate to 5 parts glycolic acid, 3 parts citric acid and 1 part oxalic acid.
- the acid cleaning composition has a pH of less than 5. More preferably, sufficient acid is present to confer a pH of between approximately 1.0- 3.5.
- the acid cleaning composition also includes further compounds selected from the group consisting of:
- further acids may be selected from the group consisting of: acetic, formic, phosphoric, sulphuric acids, and combinations thereof.
- the composition may include an anti-microbial agent or agents.
- the composition also gains additional sanitiser properties which may be equally effective on gram-negative and gram-positive micro-organisms and on yeast and moulds.
- the composition even without anti-microbial agent, still has sanitising properties.
- An advantage of the composition of the invention is that the antimicrobial activity of the composition is unaffected by water hardness which can be an issue in the art.
- antimicrobial compound is included at a concentration of 3-10% of the total composition by weight.
- the anti-microbial agent or agents may include quaternary ammonium compounds (QAC).
- QAC quaternary ammonium compounds
- Non-limiting examples include didecyl dimethyl ammonium chloride; N-alkyl ( C12-14 ) dimethyl benzyl ammonium chloride; N 1 N- bis (3-aminopropyl) dodecylamine; N-decyl-N-isononyl-N.N-dimethyl ammonium chloride, N-lsononyl- N,N,N-trimethyl ammonium chloride, decyl chloride blend.
- the various QACs may be either:
- the anti-microbial agent may be from the quaternary ammonium chloride family including dialkyls from 6-18 carbon atoms ammonium chlorides, dialkyls from 1-4 carbon atoms ammonium chlorides.
- dialkyls from 6-18 carbon atoms ammonium chlorides, dialkyls from 1-4 carbon atoms ammonium chlorides.
- the antimicrobial agent may be a combination of quaternary ammonium compounds consisting of the following blend in a 1:1:2:2.67 weight ratio respectively:
- the total levels of this blend (a-d) will preferably range from 500 to lOOOppm's (parts by weight per million).
- Tomah quaternaries are based on the reaction of high molecular weight aliphatic tertiary amines with an alkylating agent such as methyl chloride. Quaternaries are more cationic and more stable to pH change than other amine-based surfactants such as ethoxylated amines or amine acetate salts. The different molecular configurations give different solubility, emulsification, and cationic strength properties. Most Tomah quaternaries can be represented by the formula: RO(CH 2 ) 3 N + (CH 3 )(C 2 H 4 OH) 2 Cr
- R is an aliphatic alkyl of hydrophobe (of 6-18 carbon atoms)
- R is an aliphatic alkyl of hydrophobe (of 6-18 carbon atoms)
- Other useful quaternary ammonium materials are:
- antimicrobial compounds include polymeric ammonium quaternary compounds - polyquats, for example N,N-dimethyl-2- hydroxypropylammonium chloride polymer.
- polymeric ammonium quaternary compounds - polyquats for example N,N-dimethyl-2- hydroxypropylammonium chloride polymer.
- Yet another preferred antimicrobial compound are the poly-(hexamethylene- biguanite) hydrochloride (PHMB) based antimicrobial compounds. Given the fact that the PHMB molecule is cationic in nature, these antimicrobials formulate in a manner analogous to quaternary ammonium compounds.
- PHMB poly-(hexamethylene- biguanite) hydrochloride
- the surfactant compound is a non-ionic compound.
- the surfactant in the present invention may be present in an amount of about 0.1-15% by weight of the total composition, or in an amount of 0.1-12% by weight of the total composition, or in an amount of 0.2-5% by weight of the total composition, or preferably in an amount of 0.3-1% by weight of the total composition.
- Preferred surfactants may include:
- a main advantage of this class of surfactants is that they are non-ionic and therefore miscible with anionic, cationic and other non-ionic surfactants; they do not react with cations, such as calcium and magnesium, which means they can be used in hard water; and they are fully resistant to non-oxidising acids in concentrations at which they are normally employed in applications.
- Non-ionic surface active agents are usually the reaction product of an alkylene oxide, typically ethylene oxide, with an alcohol, alkylphenol, alkylamine, fatty acid or other appropriate compound having at least one active hydrogen atom.
- an alkylene oxide typically ethylene oxide
- an alcohol alkylphenol, alkylamine, fatty acid or other appropriate compound having at least one active hydrogen atom.
- the most common alcohols, amines and acids have a carbon chain length in the range C 8 -C 18 and the most common alkylphenols are nonylphenol and octylphenol.
- Dialkylphenols and trialkylphenols are also used in some specialised applications.
- the inventors have found that the most suitable non-ionic surfactants are alcohol alkoxylates and nonylphenol ethoxylates.
- alcohol alkoxylate based surfactants are such that they can be used to formulate acidic, alkaline and neutral cleaners that satisfy the most varied requirements. These types of surfactants generally perform well as emulsifiers, although some perform better than others. Their practical performance as emulsifiers can be gauged according to their hydrophilic - lipophilic balance, which correlates with their degree of ethoxylation. They are very effective wetting agents.
- the inventors have found that the most suitable surfactants from this range are alcohol alkoxylates with average molar mass 500-830g/mol, HLB value 14-16, degree of ethoxylation 8-10.
- a diluent may be added to the concentrate prior to use.
- the diluent is food grade.
- the diluent is potable water.
- the concentrate may be added to the diluent at a ratio from 1 :10 parts concentrate to diluent to 1:1500 parts concentrate to diluent, or in a ratio from about 1 :100 to about 1 :1300 or more preferably from about 1 :500 to 1 :1200 parts of concentrate to diluent.
- the acid cleaning composition concentrate may be diluted at a rate of less than 1 ,5mL concentrate per litre of diluent. More preferably, the dilution rate may be less than or equal to 1.OmL concentrate per litre of diluent.
- a preferred embodiment of the solution of the present invention is a low foaming, acidic antimicrobial sanitising and/or cleaning solution prepared by diluting the composition as defined above with potable water in such ratio, that it comprises between about 1 to about lOOOOppm, preferably from about 100 to about ⁇ OOOppm, most preferably from about 400 to about 6000ppm of the antimicrobial agent or agents; and optionally, a sufficient amount of the detergent to induce surface wetting and soil removal and water as the balance of the composition.
- synergies were noted form the mixture that were unexpected particularly around the lower concentration of concentrate required compared to what would have been expected in the art.
- the inventors also completed experiments using only two of the acids described and eliminating the third. The results were considerably less effective at cleaning and the same lower concentration result was not observed.
- the inventors understand that the synergy observed may be explained by the synergistic effect of the glycolic acid unique chemical properties, due to presence of hydroxyl and carboxyl groups, chelating properties of citric acid and the oxalic acid relatively strong dicarboxylic acid and able to play role as ligand.
- the different properties combine to form a cleaning composition that enhances the de-scaling and chelating properties of the acids individually.
- oxalic acid is the only possible compound in which two carboxylic groups are joined directly, for this reason oxalic acid is one of the strongest organic acids. Unlike other carboxylic acids, oxalic acid is readily oxidised.
- the organic acid with both alcohol and acid functionality is glycolic acid.
- the organic acid with chelating properties is citric acid.
- the organic acid exhibiting reactions characteristic of carboxylic acids is oxalic acid.
- composition produced in the method in step (a) includes:
- mixing is completed in step (a) using ratios of acids approximate to:
- step (c) 0.25 to 1.75 parts by weight organic acid exhibiting reactions characteristic of carboxylic acids.
- mixing is completed in step (a) using a ratio of acids approximate to 5 parts glycolic acid, 3 parts citric acid and 1 part oxalic acid.
- the method also includes the step of mixing in additional compounds selected from the group consisting of: further acids selected from organic or inorganic acids; at least one antimicrobial agent; at least one surfactant compound; and combinations thereof.
- the surfactant compound is a non-ionic compound.
- the diluent used in step (b) is water.
- the concentrate is added to the diluent in step (b) at a ratio from 1 part concentrate to 10 parts diluent to 1 part concentrate to 1000 parts diluent.
- the composition is a low foaming composition on dilution and application capable of removing intense flavour, e. g. of soft drinks.
- Commonly used acid cleaner sanitisers containing quaternary ammonium compounds as sanitising agents are known to produce foam, which sometimes makes it hard to dilute the concentrate to the appropriate level. This results in not having adequate concentration of active ingredient in final solution, for example, over diluting the solution because of an unclear border between liquid/foam phases;
- composition also requires less water to rinse the residues such as foam off the surface after application, which has some environmental and economical effects;
- composition is less corrosive than the art
- composition is more environmentally friendly than the art
- the manufacturing process incorporates less corrosive raw materials, and generates no heat during production unlike art compositions such as those containing sulphuric acid;
- compositions were prepared with different concentrations of oxalic, citric and glycolic acids as shown in Table 1 below.
- compositions contained antimicrobial compound in concentration of 50 g/L, and non ionic surfactant in amount of 5.1 g/L and were diluted at a rate of 1.5ml_ per litre of potable water.
- compositions were initially tested on their stability at both low and elevated temperatures.
- compositions 4 and 5 did not show the desired stability at low temperatures.
- Low temperature stability is important where the composition may be stored in cold conditions, for example in unheated storage warehouses or dairy sheds.
- compositions 3 and 6 did not show satisfying results in rust spot removal from applied surfaces.
- composition 8 was not found to show the desired cleaning ability at the dilution rates tested.
- Milk stone removal was then tested. Milk stones preparation was completed by the method described in the art 3 .
- the method involves cleaning type 302 stainless steel strips first with phosphoric acid based acid cleaner and then with alkaline cleaner, followed by thoroughly rinsing the steel strips in distilled water and drying. The strips were then weighed and placed so that lower parts of the strips were consecutively dipped into vessels containing: a) 250ppm available chlorine solution, b) raw whole
- compositions 1 , 2, 7 described above were prepared at dilution rate 1ml/L and 1.5ml/L in hot (75-85 0 C - recommended temperature for acid rinse procedure) water.
- the steel strips were dipped into the prepared diluted compositions for 60 seconds under constant mechanical stirring, rinsed with distilled water, dried and weighted to determine the amount of removed milkstone as a difference in strip weight.
- composition 1 In addition, it was found, that the best properties, from application and performance point of view, are shown by composition 1 although compositions 2 and 7 also gave useful results.
- the steel strips used were dipped into the prepared diluted compositions for 60 seconds under constant mechanical stirring, rinsed with distilled water, dried and weighed to determine the amount of removed milkstone as a difference in strip weight.
- Composition 1 removed approximately 99.97% on average of formed milkstone, compared to combatTM acid sanitiser, where the average milkstone removal was approximately 99.968%.
- a further advantage is that, because there are fewer foam residues, less water is required to rinse the residues off the surface of treated equipment after application thereby reducing the processing water required and resulting in environmental and economical benefits.
- Formulation 1 included 214.28 kg per 1000L of glycolic acid and 120 kg per 1000L of citric acid;
- Formulation 2 included 274.28 kg per 1000L of glycolic acid and 60 kg per 1000L of oxalic acid;
- Formulation 3 included glycolic, citric and oxalic acids in total equalling 334.28 kg per 1000L.
- glycolic, citric, oxalic acid containing compositions are now described in Tables 2 to 5 below.
Abstract
Description
Claims
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