US2172075A - Noncorrosive antifreeze liquid - Google Patents
Noncorrosive antifreeze liquid Download PDFInfo
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- US2172075A US2172075A US187432A US18743238A US2172075A US 2172075 A US2172075 A US 2172075A US 187432 A US187432 A US 187432A US 18743238 A US18743238 A US 18743238A US 2172075 A US2172075 A US 2172075A
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- alcohol
- inhibitor
- acid
- corrosion
- corrosive
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- 239000007788 liquid Substances 0.000 title description 16
- 230000002528 anti-freeze Effects 0.000 title description 14
- 230000009972 noncorrosive effect Effects 0.000 title description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 30
- 239000003112 inhibitor Substances 0.000 description 29
- 230000007797 corrosion Effects 0.000 description 21
- 238000005260 corrosion Methods 0.000 description 21
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Substances OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 17
- 229910052751 metal Inorganic materials 0.000 description 17
- 239000002184 metal Substances 0.000 description 17
- 108010053481 Antifreeze Proteins Proteins 0.000 description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 12
- -1 aromatic nitro-carboxy compounds Chemical class 0.000 description 11
- 239000012809 cooling fluid Substances 0.000 description 11
- 150000002739 metals Chemical class 0.000 description 11
- 150000001875 compounds Chemical class 0.000 description 10
- 239000012530 fluid Substances 0.000 description 10
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 230000003449 preventive effect Effects 0.000 description 9
- 239000002253 acid Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 8
- 230000002401 inhibitory effect Effects 0.000 description 8
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 150000001298 alcohols Chemical class 0.000 description 6
- 125000003118 aryl group Chemical group 0.000 description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 description 6
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000004317 sodium nitrate Substances 0.000 description 5
- 235000010344 sodium nitrate Nutrition 0.000 description 5
- 238000007792 addition Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- SLAMLWHELXOEJZ-UHFFFAOYSA-N 2-nitrobenzoic acid Chemical compound OC(=O)C1=CC=CC=C1[N+]([O-])=O SLAMLWHELXOEJZ-UHFFFAOYSA-N 0.000 description 3
- OTLNPYWUJOZPPA-UHFFFAOYSA-N 4-nitrobenzoic acid Chemical compound OC(=O)C1=CC=C([N+]([O-])=O)C=C1 OTLNPYWUJOZPPA-UHFFFAOYSA-N 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 229910001963 alkali metal nitrate Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 150000007514 bases Chemical class 0.000 description 3
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid group Chemical group C(C1=CC=CC=C1)(=O)O WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- WLJVXDMOQOGPHL-UHFFFAOYSA-N phenylacetic acid Chemical class OC(=O)CC1=CC=CC=C1 WLJVXDMOQOGPHL-UHFFFAOYSA-N 0.000 description 3
- 235000010288 sodium nitrite Nutrition 0.000 description 3
- VYWYYJYRVSBHJQ-UHFFFAOYSA-N 3,5-dinitrobenzoic acid Chemical compound OC(=O)C1=CC([N+]([O-])=O)=CC([N+]([O-])=O)=C1 VYWYYJYRVSBHJQ-UHFFFAOYSA-N 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- YBADLXQNJCMBKR-UHFFFAOYSA-N (4-nitrophenyl)acetic acid Chemical compound OC(=O)CC1=CC=C([N+]([O-])=O)C=C1 YBADLXQNJCMBKR-UHFFFAOYSA-N 0.000 description 1
- GSVGZXWNWOCWGJ-UHFFFAOYSA-N 2-[(3-nitrobenzoyl)amino]acetic acid Chemical compound OC(=O)CNC(=O)C1=CC=CC([N+]([O-])=O)=C1 GSVGZXWNWOCWGJ-UHFFFAOYSA-N 0.000 description 1
- WWXMVRYHLZMQIG-SNAWJCMRSA-N 3-nitrocinnamic acid Chemical compound OC(=O)\C=C\C1=CC=CC([N+]([O-])=O)=C1 WWXMVRYHLZMQIG-SNAWJCMRSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical class OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001339 alkali metal compounds Chemical class 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000002079 cooperative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010697 neat foot oil Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000005338 nitrobenzoic acids Chemical class 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 159000000001 potassium salts Chemical class 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/20—Antifreeze additives therefor, e.g. for radiator liquids
Definitions
- the invention relates to non-corrosive antifreeze liquids of the type containing an alcohol as the freezing point depressant. It is particularly concerned with inhibiting agents for such liquids adapted to suppress therein corrosive con- .ditions toward metals of a fluid cooling system.
- Alcohols are now quite generally used in automotive engines to provide non-freezing cooling liquids, and many danderrent alcohols have been used for this purpose. Representative of these are methanol, ethanol, propanol or other monohydroxy alcohols, and the polyhydroxy compounds including ethylene and propylene glycol, diethylene glycol, or other glycols and their mixtures, and glycerol.
- the present invention is applicable to cooling fluids containing any of these alcohols as freezing point depressants, and an alcohol as referred to in the specification and claims is intended to include any of the monohydric or polyhydric compounds.
- Alcohols are not inherently corrosive toward metals, but cooling fluids containing them are subjected to conditions in an automobile cooling system through which a corrosive action is often induced in the fluid. This may be due to a number of factors such as aeration during circulation of the water-diluted fluid, adventitious addition to the fluid of exhaust gases or other impurities, localized overheating, and other circumstances arising primarily from common faults of the usual cooling system. Itis, therefore, a known practice to employ corrosion inhiblti-ng materials with alcohols for use in antlfreeze solutions, to repress induced corrosive conditions and protect the metals of the cooling system.
- the nitro group is attached directly to the benzene ring, but the carboxyl group may be on the ring or in a side chain, and the latter can be either saturated or unsaturated in character.
- These materials function as an inhibitor in neutral, alkaline and slightly acid solutions, and will maintain corrosion protection throughout the normal life of the cooling fluid.
- methanol, ethylene glycol, and other mono and polyhydric alcohols the presence of the inhibitor in amounts of about 0.05 to 1.0% by weight of the alcohol is sufllcient to provide excellent metal protection, and in all usual water dilutions as a cooling fluid the inhibitor remains effective.
- the aromatic nitro-carboxy compounds are efiective without further additions as a corrosion inhibitor, but other known inhibitor materials can be used in conjunction therewith if desired.
- other known inhibitor materials can be used in conjunction therewith if desired.
- certain oils, or agents for retarding leakage compounds such as sodium nitrate and sodium nitrite for further specific aluminum and iron protection respectively, and basic materials which may aid in maintaining a reserve alkalinity in the cooling solution.
- These additional inhibitor components do not afiect the primary corrosion protection afforded by the nitro-carboxy compound, but the cooperative action of a plurality of inhibitors may be desirable for specific uses.
- compositions shown will be evident, as will also the actual percentage of, the essential inhibitor and other components.
- salts of the aromatic nitro-carboxy derivatives may be equally efiective in inhibiting action, including such as the sodium and potassium salts, or organic derivatives such as the triethanolamine salt.
- Thesematerlals are intended to be included within the broad interpretation of aromatic nitrocarboxy compounds as referred to in the speciflcation and claims.
- Specific anti-leak ingredients, dyes for coloring the alcohol, and inhibitors tor other purposes may also be desirable, and many modifications are possible within the broader scope of this disclosure. The invention should not be limited other than as defined by the appended claims.
- a non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive. an aromatic nitrocarboxy compound, having a nitro group directly attached to the aromatic nucleus.
- a non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive about 0.05% to 1.0% by weight of the alcohol of an aromatic nitro-carboxy compound, having a nitro group directly attached to the aromatic nucleus.
- a non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive a nitro-carboxy compound derived from an acid of the group consisting of benzoic, phthallic, hippuric, cinnamic and phenylacetic acids, and having a nitro group directly attached to the aromatic nucleus.
- a non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive about 0.05% to 1.0% by weight of the alcohol of a nitro-carboxy compound derived from an acid of the group consisting of benzoic, phthallic, hippuric, cinnamic and phenylacetic acids, and having a nitro group directly attached to the aromatic nucleus.
- a non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive about 0.05% to 1.0% by weight of the alcohol of a nitrobenzoic acid.
- a non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive about 0.05% to 1.0% by weight of the alcohol of 3,5-dinitrobenzoic acid.
- a non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive about 0.05% to 1.0% by weight oi. the alcohol of 3-nitrophthallic acid.
- a non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor mixture containing an aromatic nitro-carboxy compound having a nitro group directly attached to the aromatic nucleus, an alkali metal nitrate, and a basic alkali metal compound. 4
- a non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor mixtureconsisting of a nitrobenzoic acid, an alkali metal nitrate, an oil and a basic compound, of the group consisting of sodium carbonate and sodium hydroxide.
- a non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor mixture consisting of a nitrobenzoic acid, an alkali metal nitrate,'an alkali metal nitrite, and a basic compound, of the group consisting oi sodium carsodium nitrate, 1.5% oil, and 0.2% to 0.4% of a basic compound, of the group consisting of sodium carbonate and sodium hydroxide.
- a non-corrosive anti-freeze liquid comprising ethylene glycol and an inhibitor mixture consisting in percentage by weight of the ethylene glycol of 0.3% p-nitrobenzoic acid, 0.3% sodium nitrite, 0.1% sodium nitrate, and 0.25% sodium carbonate.
- Method of inhibiting corrosion of metals by an alcohol cooling fluid in contact therewith which comprises contacting said fluid with the metal in the presence of an inhibitor containing as the essential corrosion preventive an aromatic nitro-carboxy compound having a nitro group directly attached to the aromatic nucleus, said compound being present in an amount about 0.05% to 1.0% by weight of the alcohol.
- Method of inhibiting corrosion of metals by an alcohol cooling fluid in contact therewith which comprises contacting said fluid with the metal in the presence of an inhibitor containing as the essential corrosion preventive a nitrocarboxy compound derived from an acid of the group consisting of benzoic, phthalllc, hippuric, cinnamic and phenylacetic acids, said inhibitor being present in an amount about 0.05% to 1.0% by weight of the alcohol.
- Method of inhibiting corrosion of metals by an alcohol cooling fluid in contact therewith which comprises contacting said fluid with the metal inthe presence of an inhibitor mixture consisting of a nitrobenzolc acid, sodium nitrate, oil, sodium carbonate, and sodium hydroxide.
- Method of inhibiting corrosion of metals by an alcohol cooling fluid in contact therewith which comprises contacting said fluid with the metal in the presence of an inhibitor mixture consisting of p-nitrobenzoic acid, sodium nitrite, sodium nitrate, and sodium carbonate.
- Method of inhibiting corrosion of metals by an alcohol cooling fluid in contact therewith which comprises contacting said fluid with the metal in the presence of an inhibitor mixture consisting of p-nitrobenzoic acid, sodium nitrate, and sodium carbonate.
Description
h w i ll Patented SEept. 5, 1939 UNITED STATES- NONCOBROSIVE mam moum Fred B. Whaley, Buflalo, N. Y., asslgnor to Carhide and carbonchcmioala Corporation, a corporation of New York No Drawing. Application January 2a, 1938,. Serial No. 187,432
18 Claims.
The invention relates to non-corrosive antifreeze liquids of the type containing an alcohol as the freezing point depressant. It is particularly concerned with inhibiting agents for such liquids adapted to suppress therein corrosive con- .ditions toward metals of a fluid cooling system.
Alcohols are now quite generally used in automotive engines to provide non-freezing cooling liquids, and many diilerent alcohols have been used for this purpose. Representative of these are methanol, ethanol, propanol or other monohydroxy alcohols, and the polyhydroxy compounds including ethylene and propylene glycol, diethylene glycol, or other glycols and their mixtures, and glycerol. The present invention is applicable to cooling fluids containing any of these alcohols as freezing point depressants, and an alcohol as referred to in the specification and claims is intended to include any of the monohydric or polyhydric compounds.
Alcohols are not inherently corrosive toward metals, but cooling fluids containing them are subjected to conditions in an automobile cooling system through which a corrosive action is often induced in the fluid. This may be due to a number of factors such as aeration during circulation of the water-diluted fluid, adventitious addition to the fluid of exhaust gases or other impurities, localized overheating, and other circumstances arising primarily from common faults of the usual cooling system. Itis, therefore, a known practice to employ corrosion inhiblti-ng materials with alcohols for use in antlfreeze solutions, to repress induced corrosive conditions and protect the metals of the cooling system. Many addition agents have been proposed for this purpose, but the protection afforded by prior inhibitors for all metals of the common cooling system, which includes iron, aluminum, copper, brass, and solder, has not been entirely satisfactory, and even where mixtures of a plurality of inhibitor compounds have been used, a deficiency in protection of one or more of the above metals is usually encountered;
It is an object of my invention to provide an improved corrosion inhibitorior alcohol cooling fluids, and an anti-freeze liquid in which induced corrosive conditions are repressed or prevented, to adequately protect all five metals of the cooling system.
I have found a group of compounds of excel lent inhibitor qualities, which by addition individually in very small quantities to an alcohol cooling fluid will repress induced corrosive action in such fluids under all normal operating conditions. These compounds may be broadly classed as aromatic nitro-carboxy derivatives, all members of which as a group appear to show a characteristic corrosion inhibiting action. Specific compounds of this class, which have proven by actual test to repress corrosion of iron, aluminum, copper, brass and solder, include such as ortho, meta and para nitrobenzoic acids, 3,5-dinitrobenzoic acid, 3-nitrophthallic acid, m-nitrohippuric acid, m-nitrocinnamic acid and p-nitrophenyl acetic acid. In each of these compounds the nitro group is attached directly to the benzene ring, but the carboxyl group may be on the ring or in a side chain, and the latter can be either saturated or unsaturated in character. These materials function as an inhibitor in neutral, alkaline and slightly acid solutions, and will maintain corrosion protection throughout the normal life of the cooling fluid. In methanol, ethylene glycol, and other mono and polyhydric alcohols, the presence of the inhibitor in amounts of about 0.05 to 1.0% by weight of the alcohol is sufllcient to provide excellent metal protection, and in all usual water dilutions as a cooling fluid the inhibitor remains effective.
As indicated, the aromatic nitro-carboxy compounds are efiective without further additions as a corrosion inhibitor, but other known inhibitor materials can be used in conjunction therewith if desired. Among the latter are certain oils, or agents for retarding leakage, compounds such as sodium nitrate and sodium nitrite for further specific aluminum and iron protection respectively, and basic materials which may aid in maintaining a reserve alkalinity in the cooling solution. These additional inhibitor components do not afiect the primary corrosion protection afforded by the nitro-carboxy compound, but the cooperative action of a plurality of inhibitors may be desirable for specific uses.
Representative formulae which have given especially good results in an ethylene glycol solution are shown in the following table, in which the amounts of various components are expressed in percentage by weight of the ethylene glycol:
parts sulfonated neats-foot oil, 90 parts mineral oil.
Many variations in the compositions shown will be evident, as will also the actual percentage of, the essential inhibitor and other components. In place of the straight acid compounds, salts of the aromatic nitro-carboxy derivatives may be equally efiective in inhibiting action, including such as the sodium and potassium salts, or organic derivatives such as the triethanolamine salt. Thesematerlals are intended to be included within the broad interpretation of aromatic nitrocarboxy compounds as referred to in the speciflcation and claims. Specific anti-leak ingredients, dyes for coloring the alcohol, and inhibitors tor other purposes may also be desirable, and many modifications are possible within the broader scope of this disclosure. The invention should not be limited other than as defined by the appended claims.
I claim:
1. A non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive. an aromatic nitrocarboxy compound, having a nitro group directly attached to the aromatic nucleus.
2. A non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive about 0.05% to 1.0% by weight of the alcohol of an aromatic nitro-carboxy compound, having a nitro group directly attached to the aromatic nucleus.
3. A non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive a nitro-carboxy compound derived from an acid of the group consisting of benzoic, phthallic, hippuric, cinnamic and phenylacetic acids, and having a nitro group directly attached to the aromatic nucleus.
4. A non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive about 0.05% to 1.0% by weight of the alcohol of a nitro-carboxy compound derived from an acid of the group consisting of benzoic, phthallic, hippuric, cinnamic and phenylacetic acids, and having a nitro group directly attached to the aromatic nucleus.
5. A non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive about 0.05% to 1.0% by weight of the alcohol of a nitrobenzoic acid.
6. A non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive about 0.05% to 1.0% by weight of the alcohol of 3,5-dinitrobenzoic acid.
'7. A non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor containing as the essential corrosion preventive about 0.05% to 1.0% by weight oi. the alcohol of 3-nitrophthallic acid.
8. A non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor mixture containing an aromatic nitro-carboxy compound having a nitro group directly attached to the aromatic nucleus, an alkali metal nitrate, and a basic alkali metal compound. 4
9. A non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor mixtureconsisting of a nitrobenzoic acid, an alkali metal nitrate, an oil and a basic compound, of the group consisting of sodium carbonate and sodium hydroxide.
10. A non-corrosive anti-freeze liquid comprising an alcohol and an inhibitor mixture consisting of a nitrobenzoic acid, an alkali metal nitrate,'an alkali metal nitrite, and a basic compound, of the group consisting oi sodium carsodium nitrate, 1.5% oil, and 0.2% to 0.4% of a basic compound, of the group consisting of sodium carbonate and sodium hydroxide.
13. A non-corrosive anti-freeze liquid comprising ethylene glycol and an inhibitor mixture consisting in percentage by weight of the ethylene glycol of 0.3% p-nitrobenzoic acid, 0.3% sodium nitrite, 0.1% sodium nitrate, and 0.25% sodium carbonate.
14. Method of inhibiting corrosion of metals by an alcohol cooling fluid in contact therewith, which comprises contacting said fluid with the metal in the presence of an inhibitor containing as the essential corrosion preventive an aromatic nitro-carboxy compound having a nitro group directly attached to the aromatic nucleus, said compound being present in an amount about 0.05% to 1.0% by weight of the alcohol.
15. Method of inhibiting corrosion of metals by an alcohol cooling fluid in contact therewith, which comprises contacting said fluid with the metal in the presence of an inhibitor containing as the essential corrosion preventive a nitrocarboxy compound derived from an acid of the group consisting of benzoic, phthalllc, hippuric, cinnamic and phenylacetic acids, said inhibitor being present in an amount about 0.05% to 1.0% by weight of the alcohol.
16. Method of inhibiting corrosion of metals by an alcohol cooling fluid in contact therewith, which comprises contacting said fluid with the metal inthe presence of an inhibitor mixture consisting of a nitrobenzolc acid, sodium nitrate, oil, sodium carbonate, and sodium hydroxide.
1'7. Method of inhibiting corrosion of metals by an alcohol cooling fluid in contact therewith, which comprises contacting said fluid with the metal in the presence of an inhibitor mixture consisting of p-nitrobenzoic acid, sodium nitrite, sodium nitrate, and sodium carbonate.
18. Method of inhibiting corrosion of metals by an alcohol cooling fluid in contact therewith, which comprises contacting said fluid with the metal in the presence of an inhibitor mixture consisting of p-nitrobenzoic acid, sodium nitrate, and sodium carbonate.
FRED R. WHALEY.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US187432A US2172075A (en) | 1938-01-28 | 1938-01-28 | Noncorrosive antifreeze liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US187432A US2172075A (en) | 1938-01-28 | 1938-01-28 | Noncorrosive antifreeze liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2172075A true US2172075A (en) | 1939-09-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US187432A Expired - Lifetime US2172075A (en) | 1938-01-28 | 1938-01-28 | Noncorrosive antifreeze liquid |
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| Country | Link |
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| US (1) | US2172075A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2815328A (en) * | 1955-02-25 | 1957-12-03 | Nat Aluminate Corp | Corrosion inhibitor composition for aqueous liquids |
| US4324675A (en) * | 1980-01-10 | 1982-04-13 | Basf Aktiengesellschaft | Protective additive for radiators in coolants containing water |
| EP0081738A1 (en) * | 1981-12-05 | 1983-06-22 | Hoechst Aktiengesellschaft | Nitrite-free cooling fluids on the basis of glycols |
| DE3200349A1 (en) * | 1982-01-08 | 1983-07-21 | Hoechst Ag, 6230 Frankfurt | Nitrite-free functional fluids based on glycols |
| US4664833A (en) * | 1982-03-31 | 1987-05-12 | Union Carbide Corporation | Organosiloxane-silicate copolymer antifreeze composition with nitrate corrosion inhibitor |
| US4725405A (en) * | 1982-03-31 | 1988-02-16 | First Brands Corporation | Organosiloxane-silicate copolymer antifreeze composition with nitrate corrosion inhibitor |
-
1938
- 1938-01-28 US US187432A patent/US2172075A/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2815328A (en) * | 1955-02-25 | 1957-12-03 | Nat Aluminate Corp | Corrosion inhibitor composition for aqueous liquids |
| US4324675A (en) * | 1980-01-10 | 1982-04-13 | Basf Aktiengesellschaft | Protective additive for radiators in coolants containing water |
| EP0081738A1 (en) * | 1981-12-05 | 1983-06-22 | Hoechst Aktiengesellschaft | Nitrite-free cooling fluids on the basis of glycols |
| DE3200349A1 (en) * | 1982-01-08 | 1983-07-21 | Hoechst Ag, 6230 Frankfurt | Nitrite-free functional fluids based on glycols |
| US4664833A (en) * | 1982-03-31 | 1987-05-12 | Union Carbide Corporation | Organosiloxane-silicate copolymer antifreeze composition with nitrate corrosion inhibitor |
| US4725405A (en) * | 1982-03-31 | 1988-02-16 | First Brands Corporation | Organosiloxane-silicate copolymer antifreeze composition with nitrate corrosion inhibitor |
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