KR101405141B1 - Eco-friendly solution type deicer and its manufacturing method - Google Patents
Eco-friendly solution type deicer and its manufacturing method Download PDFInfo
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- KR101405141B1 KR101405141B1 KR1020140049982A KR20140049982A KR101405141B1 KR 101405141 B1 KR101405141 B1 KR 101405141B1 KR 1020140049982 A KR1020140049982 A KR 1020140049982A KR 20140049982 A KR20140049982 A KR 20140049982A KR 101405141 B1 KR101405141 B1 KR 101405141B1
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- nitric acid
- solution
- acetic acid
- concentration
- magnesium oxide
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 311
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 116
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 116
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 89
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 89
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 89
- 239000002253 acid Substances 0.000 claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000007864 aqueous solution Substances 0.000 claims description 93
- 239000000243 solution Substances 0.000 claims description 90
- 239000003795 chemical substances by application Substances 0.000 claims description 42
- 239000007787 solid Substances 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 238000013019 agitation Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 2
- 239000011343 solid material Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 abstract description 8
- 238000006386 neutralization reaction Methods 0.000 abstract description 8
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 46
- 238000002844 melting Methods 0.000 description 30
- 230000008018 melting Effects 0.000 description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 28
- 238000005260 corrosion Methods 0.000 description 27
- 230000007797 corrosion Effects 0.000 description 27
- 238000001514 detection method Methods 0.000 description 14
- UEGPKNKPLBYCNK-UHFFFAOYSA-L magnesium acetate Chemical compound [Mg+2].CC([O-])=O.CC([O-])=O UEGPKNKPLBYCNK-UHFFFAOYSA-L 0.000 description 14
- 239000011654 magnesium acetate Substances 0.000 description 14
- 235000011285 magnesium acetate Nutrition 0.000 description 14
- 229940069446 magnesium acetate Drugs 0.000 description 14
- 150000003839 salts Chemical class 0.000 description 14
- 230000008014 freezing Effects 0.000 description 13
- 238000007710 freezing Methods 0.000 description 13
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 10
- 238000011156 evaluation Methods 0.000 description 10
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 9
- 239000003153 chemical reaction reagent Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000011780 sodium chloride Substances 0.000 description 8
- 239000002689 soil Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000004744 fabric Substances 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- WJMFXQBNYLYADA-UHFFFAOYSA-N 1-(3,4-dihydroxyphenyl)-6,7-dihydroxy-1,2-dihydronaphthalene-2,3-dicarboxylic acid Chemical compound C12=CC(O)=C(O)C=C2C=C(C(O)=O)C(C(=O)O)C1C1=CC=C(O)C(O)=C1 WJMFXQBNYLYADA-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010257 thawing Methods 0.000 description 6
- 230000004580 weight loss Effects 0.000 description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 5
- 239000001110 calcium chloride Substances 0.000 description 5
- 229910001628 calcium chloride Inorganic materials 0.000 description 5
- 238000000855 fermentation Methods 0.000 description 5
- 230000004151 fermentation Effects 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 229910001629 magnesium chloride Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 241000238578 Daphnia Species 0.000 description 4
- 231100000215 acute (single dose) toxicity testing Toxicity 0.000 description 4
- 238000011047 acute toxicity test Methods 0.000 description 4
- 229910052793 cadmium Inorganic materials 0.000 description 4
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- -1 organic acid salt Chemical class 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229920002101 Chitin Polymers 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 150000001805 chlorine compounds Chemical class 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 3
- 239000000383 hazardous chemical Substances 0.000 description 3
- 239000006193 liquid solution Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229920001661 Chitosan Polymers 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 244000144972 livestock Species 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000001139 pH measurement Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- 239000005413 snowmelt Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000009182 swimming Effects 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 125000002777 acetyl group Chemical group [H]C([H])([H])C(*)=O 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 239000011260 aqueous acid Substances 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000034994 death Effects 0.000 description 1
- 231100000517 death Toxicity 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000007792 gaseous phase Substances 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000012456 homogeneous solution Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910000462 iron(III) oxide hydroxide Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- OUHCLAKJJGMPSW-UHFFFAOYSA-L magnesium;hydrogen carbonate;hydroxide Chemical compound O.[Mg+2].[O-]C([O-])=O OUHCLAKJJGMPSW-UHFFFAOYSA-L 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 208000023504 respiratory system disease Diseases 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002602 strong irritant Substances 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
Images
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-
- 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
- C09K3/00—Materials not provided for elsewhere
- C09K3/18—Materials not provided for elsewhere for application to surfaces to minimize adherence of ice, mist or water thereto; Thawing or antifreeze materials for application to surfaces
- C09K3/185—Thawing materials
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H10/00—Improving gripping of ice-bound or other slippery traffic surfaces, e.g. using gritting or thawing materials ; Roadside storage of gritting or solid thawing materials; Permanently installed devices for applying gritting or thawing materials; Mobile apparatus specially adapted for treating wintry roads by applying liquid, semi-liquid or granular materials
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
Abstract
Description
Non-saline type eco-friendly liquid snow removers and a method for producing the same.
Recently, there are frequent occurrences of heavy snowfall in winter due to abnormal weather. In this case, the most necessary ones are snow removers such as calcium chloride, salt, and magnesium chloride. The above-mentioned chlorides have excellent ability to dissolve the eyes of the eyes while reacting with snow and ice to generate reaction heat. Although the chlorides described above have an excellent effect on snow removal, they are toxic substances that cause corrosion of vehicles and bridges and deteriorate the physical properties of the soil. More specifically, chlorides impregnated into the soil after melting snow may enter rivers or soils, causing water pollution and acidification of the soil, causing diseases or deaths of flora and fauna, and even causing respiratory diseases in humans. It is necessary in winter, but its negative aspects can not be overlooked.
According to Korean Patent No. 10-1168946, 10 to 60% by weight of at least one organic acid salt selected from the group consisting of nitrates and salts of alkaline metals and alkaline earth metals, chitin, chitosan and chitin And 0.01 to 5% by weight of at least one polysaccharide selected from the group consisting of chitin chitosan having an acetyl group partially removed, and water. However, the above-mentioned non-saline- It is composed by adding ice-melting auxiliary agent to the ice-making agent because its melting power is lower than that of existing chloride-based snow-removing agent, and it does not completely prevent the corrosion by the snow-removing agent. In addition, as a non-salted snow-removing agent containing various compositions, many expensive compositions replacing chloride are used, which is not only high in cost, but also has a disadvantage that it is not superior to existing snow removing agents. For this reason, it is required to develop a snow remover which is cheap, environmentally friendly, simple to manufacture, easy to manufacture and excellent in performance to replace chloride snow remover.
The present invention provides an eco-friendly liquid snow-removing agent which exhibits excellent snow-removing effect without harmfulness and metal corrosion, does not cause re-icing, and can be stored for a long period of time, and a manufacturing method thereof.
A method of manufacturing an eco-friendly liquid snow removing agent according to one aspect of the present invention is characterized by comprising the steps of charging a stirrer with 80 to 90% by weight of a cumulative acid containing an aqueous nitric acid solution and an aqueous acetic acid solution, 20% by weight of magnesium oxide, stirring the magnesium oxide and the magnesium oxide, measuring the pH of the substance produced by the stirring, and if the measurement result is within the range of pH 7.0 to 7.5, Filtering the material produced by agitation by passing the material produced by agitation through a filtration device capable of blocking the solid material, and filtering the resultant liquid filtered by the filtration device as an eco-friendly liquid snow remover And a discharging step of discharging. If the measurement result is outside the range of pH 7.0 to 7.5, the stirring step may be re-executed and the measurement step may be re-executed.
The eco-friendly liquid snow removing agent prepared by the above production method comprises 80 to 90% by weight of cumulative acid and 10 to 20% by weight of solid magnesium oxide, including nitric acid aqueous solution and acetic acid aqueous solution. Wherein the concentration of the nitric acid aqueous solution and the acetic acid aqueous solution contained in the mixed acid is 12 to 20%, 20 to 30%, and 86 to 95%, respectively, 1 ratio.
It shows excellent snowing effect without harmfulness and metal corrosion, and does not cause re-icing and is easy to store for a long time.
FIG. 1 is a flow chart showing a manufacturing step of an environmentally-friendly liquid snow removing agent according to an embodiment of the present invention.
Fig. 2 is a photograph showing the results of the corrosion test by the reagent salt over time.
Fig. 3 is a photograph showing the results of the corrosion test by the sun salt according to the lapse of time.
Fig. 4 is a photograph showing the corrosion resistance test results of calcium chloride over time. Fig.
FIG. 5 is a photograph showing the corrosion resistance test results of magnesium chloride over time. FIG.
6 is a photograph showing time course of the results of the corrosion test by the environmentally-friendly liquid snow removers according to an embodiment of the present invention.
7 is a photograph of the appearance of a blade used in the corrosion test of Fig.
8 is an external view of a blade used in the corrosivity test of Fig.
9 is an external view of a blade used in the corrosion test of FIG.
10 is an external view of a blade used in the corrosion test of Fig.
11 is a photograph of the appearance of the blade used in the corrosion test of Fig.
The present invention relates to a homogeneous liquid-state liquid remoist which is designed in an environmentally friendly manner and exhibits excellent snow-removing effect without harmfulness and metal corrosion, and does not cause re-icing and is easy to store for a long period of time. The liquid snow-removing agent according to the present invention is a non-saline-based liquid snow removing agent produced by an acid-base neutralization reaction of a mixed acid including an aqueous nitric acid solution and an aqueous acetic acid solution and magnesium oxide, and the properties and uses thereof will be described later .
The eco-friendly liquid removers according to the present invention are produced by mixing and reacting 80 to 90% by weight of a cumulative acid solution containing an aqueous nitric acid solution and an aqueous acetic acid solution and 10 to 20% by weight of solid magnesium oxide.
Nitric acid (HNO 3 ) is a colorless, flaky liquid, a typical strong acid. Mix well with water, strong acidity, easy to corrode metals. It is not only hygroscopic to absorb moisture in the air, but also has a high reactivity, such as being decomposed by light. In the present invention, nitric acid was diluted to a concentration of 12 to 20%, and was designed as an aqueous acid solution with acetic acid to be described later. The nitric acid aqueous solution designed with the acetic acid together with the acetic acid is neutralized with the acidic base with the magnesium oxide to be described later to produce the aqueous magnesium nitrate solution and the resulting aqueous magnesium nitrate solution serves as the melting agent of the snow removing agent.
The aqueous magnesium nitrate solution has a freezing point lower than that of pure water due to freezing point lowering. Normally water begins to freeze at 0 ° C, but the magnesium nitrate aqueous solution begins to freeze at a lower temperature, so the surrounding ice around which the aqueous solution of magnesium nitrate is sprayed is melted and is used as a melting agent by this principle. Magnesium nitrate dissolves well in water but does not separate into crystals in water, and the vapor pressure of magnesium nitrate aqueous solution is lower than that of pure water daily. Considering that the higher the concentration of solute in the solvent is, the lower the triple point of the solution (the state where the substance is in equilibrium with the solid phase, the liquid phase, and the gaseous phase all at the specific temperature and pressure), magnesium nitrate aqueous solution You can lower the freezing point and melt it.
Acetic acid (CH 3 COOH), also called acetic acid, is a colorless liquid with a strong irritant odor. Its freezing point is large, so when it reacts with a small amount of water, its melting point drops sharply. Acetic acid is diluted in the form of an aqueous acetic acid solution and mixed with the above-mentioned nitric acid aqueous solution to neutralize the acid with the magnesium oxide to be described later to produce an aqueous solution of magnesium acetate. The aqueous magnesium acetate solution also acts as a freezing agent by freezing down the same as the above-mentioned magnesium nitrate aqueous solution, and a detailed description will be given with reference to the above description. The aqueous acetic acid solution used in the present invention is prepared at a concentration of 20 to 30%, mixed with the aqueous nitric acid solution having the concentration of 12 to 20% described above, neutralized with magnesium oxide to be described later, It is produced as a liquid snow removing agent.
The magnesium oxide used for the neutralization reaction with the above-described nitric acid aqueous solution and the aqueous solution containing acetic acid aqueous solution is a solid magnesium oxide having a concentration of 86 to 95%. Since magnesium oxide absorbs water and carbon dioxide in air and gradually changes to magnesium hydroxycarbonate, it is very difficult to use 100% magnesium oxide. Therefore, in the present invention, magnesium oxide having a concentration of 86 to 95% is used. Magnesium oxide at a concentration of 86 to 95% is reacted with the above-mentioned nitric acid and an aqueous acetic acid solution to produce a non-saline-based liquid snow removing agent mixed with an aqueous solution of magnesium nitrate and an aqueous solution of magnesium acetate. Magnesium oxide (MgO) is a white powder, insoluble salt that is difficult to dissolve in pure water. It can be dissolved in dilute acid or ethanol. In the present invention, it is stirred and reacted with the above-mentioned nitric acid aqueous solution and the mixed acid including aqueous acetic acid solution, so that a clear and homogeneous liquid-state snowmisc agent free from residues can be produced.
The condensed acid including the nitric acid aqueous solution and the aqueous acetic acid solution used in the present invention is charged in an amount of 80 to 90% by weight, and the magnesium oxide is added in an amount of 10 to 20% by weight. As described above, the condensed acid is used as a mixture of an aqueous nitric acid solution and an aqueous acetic acid solution by mixing a 12 to 20% nitric acid aqueous solution and a 20 to 30% aqueous acetic acid solution. The concentration ranges of the respective compositions and the respective composition ratios are not considered separately. When the respective compositions prepared in the respective concentration ranges are designed in consideration of the respective composition ratios described above, the pH ranges of 7.0 to 7.5 A range of neutral snow removers may be generated, so the concentration ranges of the respective compositions and the respective composition ratios should be considered together. In order to explain the concentration ranges and composition ratios of the mixed acid and magnesium oxide including the nitric acid aqueous solution and the aqueous acetic acid solution in detail, the concentration ranges of the aqueous nitric acid solution and the aqueous acetic acid solution were fixed to 15% aqueous nitric acid solution and 25% aqueous acetic acid solution, respectively, Nitrate aqueous solution and acetic acid aqueous solution, and the concentration of magnesium oxide to be neutralized with an acid base is fixed at 90%.
The nitric acid is diluted to a concentration of 15% to prepare an aqueous nitric acid solution, and the acetic acid is diluted to a concentration of 25% to prepare an aqueous acetic acid solution. The nitric acid aqueous solution and the aqueous acetic acid solution, which are diluted to the respective concentrations, are mixed and used as the acid solution, and neutralized with magnesium oxide at a concentration of 90%. Condensation acid is a mixture of aqueous nitric acid solution and aqueous acetic acid solution [2HNO 3 (nitric acid) + MgO (magnesium oxide) Mg (NO 3 ) (magnesium nitrate) + H 2 O (water) ], [2CH 3 COOH (acetic acid) + MgO (magnesium oxide) Mg (CH 3 COO) 2 (magnesium acetate) + H 2 O (water)]. 15% of silver nitrate 2 (63 g) / 15% = 840 g, 25% of acetic acid 2 (60 g) / 25% of the concentration of nitric acid, acetic acid and magnesium oxide, = 480 g, and the magnesium oxide having a concentration of 90% is 40 g / 90% = 44.4 g. Condensation acid was prepared by mixing nitric acid aqueous solution and acetic acid aqueous solution at a ratio of 1: 1. Therefore, magnesium oxide which can react with all of the acidic aqueous solution was 840 g of aqueous nitric acid solution and acetic acid aqueous solution, respectively, and magnesium oxide which reacted with 840 g of nitric acid aqueous solution was 44.4 g, the amount of magnesium oxide to be reacted with 840 g of acetic acid aqueous solution is 77.7 g, and the total amount of magnesium oxide required is 44.4 g + 77.7 g = 122.1 g.
For example, when the concentration of nitric acid contained in livestock livestock is designed to be less than 12%, the amount of nitric acid solution diluted to less than 12% is produced in excess of 840 g, mixed with the nitric acid aqueous solution at a ratio of 1: 1, The resulting acetic acid aqueous solution should also be prepared in excess of 840 g. In addition, the nitric acid aqueous solution and the magnesium oxide which are reacted with the aqueous nitric acid solution and the acid base neutralization reaction which are produced in excess of 840 g each are designed to be in the range of 86 to 95% of the magnesium oxide and below the minimum range of 86% , Magnesium oxide concentration range of 86 ~ 95% can be designed. However, since the ratio of magnesium nitrate and magnesium acetate acting as a melting agent per unit area is small, the efficiency of the snow remover is low as a snow remover . That is, the amount of nitric acid present in 12% to 20% of the solvent is reduced to less than 12% in the solvent 100%, and the amount of magnesium nitrate reacted with the magnesium oxide is also decreased to decrease the ratio of magnesium nitrate serving as a rusting agent per unit area .
The concentration of nitric acid is designed to be less than 12% and the concentration of acetic acid is designed to exceed 30% of the concentration range of acetic acid described above. However, since the price of acetic acid is high, Since the effect of the fertilizer acid designed by increasing the concentration of acetic acid can not be superior to the price, the concentration of nitric acid is designed considering the range suggested in the present invention.
Also, when the concentration of nitric acid is more than 12%, less than 840 g of the nitric acid aqueous solution prepared in the above-mentioned range is produced, and the aqueous acetic acid solution mixed at a ratio of 1: 1 is also produced to less than 840 g. Also, in order to satisfy the above-mentioned pH 7.0 to 7.5, the nitric acid aqueous solution and the nitric acid aqueous solution which are neutralized with the aqueous acetic acid solution each having a concentration of less than 840 g are designed to exceed the maximum range of 95% at a magnesium oxide concentration range of 86 to 95% The amount of the magnesium oxide produced in the magnesium oxide concentration range of 86 to 95% can be increased. However, the snow remover produced in this way is a nitric acid aqueous solution in which the ratio of magnesium nitrate and magnesium acetate, Is increased more than when it is prepared at a concentration of 12 to 20%, the efficiency as a snow removing agent is increased. However, when the price of nitric acid is taken into consideration, the cost of the snow removing agent is increased. Therefore, .
The concentration of nitric acid is designed to exceed 20% and the concentration of nitric acid is designed to be less than 20% from the concentration range of 20 ~ 30%. However, when the concentration of nitric acid is designed to exceed 20% The ratio of magnesium oxide that reacts with the fermented livestock decreases. At this time, since the price of nitric acid to be consumed is higher than the amount of magnesium oxide to be reduced at this time, the concentration of nitric acid is designed considering the range suggested in the present invention.
Acetic acid contained in the fermentation can also be explained in the same way as nitric acid. Acetic acid is diluted to a concentration of 20 ~ 30% and included in the fermentation. When nitric acid contained in the fermentation product is produced at a concentration of less than 20%, the nitric acid aqueous solution produced in an amount exceeding 840 g of the aqueous acetic acid solution prepared in the above-mentioned range and mixed with the aqueous acetic acid solution at a ratio of 1: ≪ / RTI > Also, in order to satisfy the above-mentioned pH 7.0 to 7.5, the aqueous solution of acetic acid and the aqueous solution of nitric acid, which are each produced in excess of 840 g, are designed to be in a concentration range of 86 to 95% and less than 86% , Magnesium oxide concentration range of 86 ~ 95% can be designed. However, since the ratio of magnesium acetate and magnesium nitrate acting as melting agents per unit area is small, the efficiency of the snow remover Falls. That is, the acetic acid, which was present in 20 to 30% of the solvent 100%, decreased to less than 20%, and reacted with the magnesium oxide. The magnesium acetate produced by the reaction with magnesium oxide is also reduced, and the ratio of magnesium acetate, which acts as a rusting agent per unit area sprayed after the snow removal operation, also decreases.
When the concentration of nitric acid is designed to be less than 20% and the concentration of nitric acid is designed to exceed 20% of the concentration range of 12 to 20% of the above-mentioned nitrate concentration, The ratio of magnesium oxide reacted with the aqueous solution and the aqueous solution of acetic acid is decreased. At this time, since the price of nitric acid is higher than the amount of magnesium oxide, the concentration of acetic acid .
When the concentration of acetic acid is more than 30%, less than 840 g of the acetic acid aqueous solution prepared in the above-mentioned range is produced, and the aqueous nitric acid solution mixed at a ratio of 1: 1 is also produced to less than 840 g. Also, in order to satisfy the above pH range of 7.0 to 7.5, the aqueous solution of acetic acid and the aqueous solution of nitric acid, which are produced at a concentration of less than 840 g each, exceed the maximum range of 95% at a magnesium oxide concentration range of 86 to 95% Or by increasing the content of magnesium oxide produced in a magnesium oxide concentration range of 86 to 95%. However, the snow removers produced in this manner can not be used because the ratio of magnesium acetate and magnesium nitrate, which act as melting agents per unit area, Acetic acid aqueous solution is more intensively increased than when the aqueous acetic acid solution is prepared at a concentration of 20 to 30%, the efficiency as a snow removing agent is increased. However, considering the commercial price of acetic acid, the cost of the snow removing agent is increased. And the concentration of acetic acid is designed.
It is possible to consider the case where the concentration of nitric acid is designed to exceed 30% and the concentration of nitric acid is designed to exceed 20% of the concentration range of nitric acid described above by 12 to 20%. However, since the price of acetic acid is high, Since the effect of the acid fertilizer designed by lowering the concentration of nitric acid can not be superior to the price, the acetic acid concentration is designed in consideration of the range suggested in the present invention.
The liquid snow removing agent thus prepared is a transparent and homogeneous liquid liquid snow removing agent, which contains 80 to 90% by weight of condensed acid, 12 to 20% by weight of magnesium oxide, 10 to 20% Mixed and reacted to produce non-saline based liquid snow removers. The non-saline liquid sorbent removers are neutralized in the range of pH 7.0-7.5, which is composed of acidic nitric acid and nitric acid containing acetic acid and alkaline magnesium oxide in concentrations of 12 to 20% By weight of acetic acid and a concentration of 86 to 95% by weight of magnesium oxide. In addition, the non-salted liquid snow removers produced are neutral in the range of pH 7.0 ~ 7.5 and can be safely used by workers because they are not exposed to acids or alkalis. They prevent soil and water pollution during snow removal, It is easy to work because the residue is absorbed in the soil after work.
Neutral snow removers designed in the range of pH 7.0 ~ 7.5 are transparent, homogeneous and liquid stable material with no residues generated by neutralization reaction of acid base and magnesium oxide with nitric acid and acetic acid for a sufficient time. It is not susceptible to long-term storage. The transparent and homogeneous liquid non-saline-based snow removers thus prepared contain ammonium ions (NO 3 -), acetic acid ions (CH 3 COO-), magnesium ions (Mg +) and water (H 2 O) All of these components make biodegradation easy and are absorbed into the soil and do not cause contamination. In addition, ammonium ion (NO 3 -) is a nitrogen (N) source that is a component of fertilizer and is absorbed into the soil during snow removal to help plant growth.
FIG. 1 is a flow chart illustrating that the compositions of the present invention are mixed and mixed to form a homogeneous liquid-state liquid removers. Referring to FIG. 1, a method of manufacturing an environmentally-friendly liquid snow removing agent according to an embodiment of the present invention comprises the steps of: mixing and reacting the above-described compositions to form a liquid, Process.
In
Alternatively, nitric acid, acetic acid, and water may be added to the agitator by calculating the amounts of nitric acid, acetic acid, and water contained in the respective concentration ranges of the above-mentioned nitric acid aqueous solution and acetic acid aqueous solution. The order of addition of nitric acid, acetic acid and water may be such that water is added first, nitric acid is added a second time, acetic acid is added a third time, water is added first, nitric acid is added a second time, nitric acid is added a third time, Water may be added first and nitric acid and acetic acid may be added at the same time. In the embodiment of the present invention, since nitric acid and acetic acid are introduced in the concentration range described above, they do not cause a sudden reaction with water but have a chemical knowledge. Therefore, water used as a solvent is added first Put in nitric acid and acetic acid. The order of addition of nitric acid and acetic acid is not determined separately, and any of them may be introduced first.
In
The fermentation acid and magnesium oxide introduced in
The amount of the added acid and the magnesium oxide including the nitric acid aqueous solution and the aqueous acetic acid solution described above will be described in detail as follows. The condensed acid is a mixture containing an aqueous nitric acid solution having a concentration of 12 to 20% and an aqueous acetic acid solution having a concentration of 20 to 30%. (1) 2HNO 3 + MgO = Mg (NO 3 ) 2 + H 2 O, (2) 2CH 3 COOH + MgO = Mg (CH 3 COOH) 2 + when the condensed acid reacts with magnesium oxide having a concentration of 86 to 95% The mechanism of (1) and (2) proceeds with H 2 O. (1), the molecular weight of nitric acid (2HNO 3 ) is approximately 2 * 63 g and the molecular weight of magnesium oxide (MgO) is approximately 40 g. A nitric acid aqueous solution having a concentration of 12 to 20% of nitric acid used in an embodiment of the present invention is used, and a solid magnesium oxide having a concentration of 86 to 95% is used as the magnesium oxide. When the concentration of the nitric acid aqueous solution is fixed to 15% of the above range of 12 to 20% and the concentration of magnesium oxide is 90% of the range of 86 to 95%, when 840 g of the nitric acid aqueous solution of 15% 44.4 g of magnesium oxide is required. Similarly, (2) can be calculated as follows. The molecular weight of acetic acid (2CH 3 COOH) is approximately 2 * 60 g, and when 480 g of 25% aqueous acetic acid solution is added, 44.4 g of magnesium oxide at 90% concentration is required.
Condensation acid should be mixed with a 15% nitric acid aqueous solution and a 25% acetic acid aqueous solution at a ratio of 1: 1. When 840 g of a 15% nitric acid aqueous solution is added by the reference to the contents of (1) and (2) 840 g of 15% nitric acid solution and 44.4 g of 90% magnesium oxide for reacting the whole amount are required. When 840 g of 25% acetic acid aqueous solution is added, 840 g of 25% acetic acid aqueous solution and 90% Lt; / RTI > Therefore, in order to react 840g of 15% nitric acid solution and 25% acetic acid aqueous solution at a ratio of 1: 1, 840g of 15% nitric acid solution and 840g of 25% acetic acid aqueous solution were reacted at a concentration of 90% g is required.
The condensed acid generated by mixing the aqueous nitric acid solution and the aqueous acetic acid solution diluted to the concentration range described above is put into a stirrer of 80 to 90% by weight. If condensed acid is added in an amount of less than 80%, the effect of the magnesium nitrate and magnesium acetate produced by the reaction with magnesium oxide decreases to lower the effect of the reducing agent. When the amount exceeds 90%, magnesium nitrate and magnesium acetate It is impossible to prepare a homogeneous liquid snow-removing agent to be implemented in the present invention.
Magnesium oxide is added in an amount of 10 to 13% by weight in a subsequent step in which a condensed acid containing an aqueous nitric acid solution and an aqueous acetic acid solution is injected in a solid form having a concentration of 86 to 95%. If magnesium oxide having a concentration of 86 to 95% is added to the agitator in an amount of less than 10% by weight, the concentration of magnesium nitrate and magnesium acetate produced by the reaction with the above-mentioned agglomerated acid is lowered to lower the melting power of the snow removing agent. it does not satisfy the range of pH 7.0 ~ 7.5 and it is biased to acidity. Even when magnesium oxide is added to the agitator in an amount exceeding 20% by weight, the pH of the resulting snow removing agent does not satisfy the above-mentioned range of 7.0 to 7.5.
In
The stirring is performed by rotating the spiral wing having a helical shape mounted inside the stirrer. The stirring was repeated 30 times for 30 minutes and 5 times for 5 times. After stirring once each time, it was checked whether the suspended solids and precipitates were not left in the solution formed by the reaction of the mixed acid and the magnesium oxide, Check with the naked eye. After each one time stirring, the transparency of the solution, the presence of suspended solids and precipitates in a solid state are visually confirmed, and a small amount of suspended solids and precipitates remain in the solid state. If the liquid portion of the solution is transparent, the liquid phase of the solution becomes opaque If there is a large amount of suspended solid and sediment in the solid state, stir again. The number of times of stirring is not limited to 5, and it may be carried out by reducing to less than 5 times or by more than 5 times depending on the transparency of only the liquid portion of the solution except for suspended solids and precipitates in a solid state. When the liquid portion of the solution becomes transparent, .
In
For example, the pH can be measured by taking 2-3 samples from the solution produced by stirring in 14 steps. If the pH of the sampled samples is not uniform and is not constant, the stirring step is repeated to sufficiently react the magnesium oxide and the magnesium oxide. Alternatively, pH can be measured by immersing the pH sensing part of the pH meter at different depths at various positions of the solution contained in the agitator, that is, at the rotating part of the agitator and the edge part corresponding to the circumferential surface of the agitator. If the pH measured at various positions of the stirrer shows a difference and is not constant, the stirring step is repeated to sufficiently react with the fermentation acid and the magnesium oxide.
In
By the process as described above, a transparent and homogeneous liquid substance having a pH of 7.0 to 7.5, which is produced by sufficient acid base neutralization reaction of 80 to 90% by weight of cumulative acid and 10 to 20% by weight of magnesium oxide, Thereby discharging it as an eco-friendly liquid removers according to an embodiment of the present invention. This discharge of the environmentally-friendly liquid snow removers is carried out by a filtration device. For example, a transparent solution may be flowed through the filter press machine during the agitation step so that only the liquid passing through the filter press of the filter press machine can flow out to the discharge pipe of the connected filter press machine to be automatically discharged.
Hereinafter, the eco-friendly liquid snow-removing agent of the present invention will be specifically described by way of Examples and Test Examples.
In the examples of the present invention, an aqueous solution of a transparent and homogeneous liquid state was prepared by neutralization of acid base and magnesium oxide, which is a mixture of an aqueous solution of nitric acid and an aqueous solution of acetic acid, Table 1 below discloses Examples 1 to 3 in which composition ratios are different.
Examples 1 to 3
Examples 1 to 3 disclosed in Table 1 were subjected to respective tests based on the EL.610 certification standard, which is an environmental mark certification standard for a snow remover. Examples of tests that have been conducted are as follows.
Test Example 1: Melting test
Table 2 shows the results of the rinsing test conducted on Examples 1 to 3. In each of the examples, the amount of ice melted for 10 minutes, 30 minutes, and 60 minutes at -5 ° C and -12 ° C was measured.
Item
As a result of the melting test described in Table 2, all the examples showed a high melting point of 90% or more as compared with the reagent salt as an authentication standard, and the result after 10 minutes showed a melting strength of more than 90% in a short time of 10 minutes It is evaluated that the initial frost resistance is excellent, and it is evaluated that it is effective to prevent re-icing because it maintains a high melting force after 60 minutes.
Test Example 2: Steel corrosion test
Table 3 shows the results of the steel corrosion test for Examples 1 to 3. In each of the examples, 2.0 kg of each was dissolved in deionized water, and the weight was reduced to 3.0% by weight.
Steel corrosion test results In all of Examples 1 to 3, corrosion did not occur at all after one week (7 days). 6 and 11, in addition to the test example 2, the degree of corrosion of the blade of the iron material based on the embodiment 2 of the present invention was shown by photograph. The photograph of FIG. 6 shows the state after one day and after seven days in order from the left, and transparency and color change did not occur during the seven day time period. FIG. 11 shows the appearance of the blades shown in FIG. 6, and after a lapse of one day and seven days after the start of the photograph, the appearance of the blade after one day or the appearance of the blade after seven days No trace of oxidation is found. Therefore, it is evaluated that the snow removing agent produced in the embodiment of the present invention is excellent in corrosion resistance.
In Figs. 2 to 5 and Figs. 7 to 10, the degree of corrosion by an aqueous solution made of sodium chloride, sun salt, calcium chloride, and magnesium chloride, which are frequently used as a damming agent, is shown.
FIG. 2 shows a 30% concentration of the reagent salt aqueous solution. It is a photograph after seven days. The aqueous solution of the reagent salt changed color to orange already in the beaker after one day, and the blade in the aqueous solution of the reagent salt is not seen. After 7 days, the beaker is reddishly oxidized and the blade is not visible either. The outer appearance of the blade obtained in Fig. 2 is shown in Fig. 7, which is one day later and seven days later, in order from the left side of the photograph shown in Fig. One day after the blade was recovered from the aqueous solution of the reagent salt, the blades were totally glazed and the tip of the blade was oxidized red. In the photograph after 7 days, the entire blade appearance was oxidized red .
FIG. 3 is a photograph showing the state after one day and seven days after the left side of the photograph, in which the concentration of the aqueous solution of sodium chloride was 30%. In both beakers, the shape of the blade is confirmed, but the color changes with the red suspension over time. The outer appearance of the blade obtained in FIG. 3 is shown in FIG. 8, which is one day later and seven days later, sequentially from the left side of the photograph shown in FIG. One day after the blade was recovered from the aqueous solution of the sun salt, the blade was totally uneven and the part of the blade was oxidized red, and in the photograph after 7 days, the whole appearance of the blade was oxidized red have.
Fig. 4 is a photograph of the calcium chloride aqueous solution at a concentration of 30%, one day after the left side of the photograph, and seven days after the left side of the photograph. In both beakers, the shape of the blade is confirmed, but the color changes with the red suspension over time. The outer appearance of the blade obtained in FIG. 4 is shown in FIG. 9, which is one day after the left side of the photograph shown in FIG. 9, and seven days after the day. It can be seen that the blade recovered from the aqueous solution of calcium chloride is already oxidized red after 1 day, and after 7 days, it appears to be rugged due to corrosion on the entire outer surface of the blade.
The magnesium chloride aqueous solution of Fig. 5 was made to have a concentration of 50%, and the photographs were taken immediately after the blade was inserted, after 1 day, and after 7 days in order from the left side of the photograph. Looking at the beakers over time, it can be seen that the magnesium chloride aqueous solution of FIG. 5 gradually becomes red, and the color of the blade is also changed. FIG. 10 is a photograph of a blade in a beaker after each lapse of time. FIG. 10 shows a blade after one day and seven days after the order from the left. 10, it can be seen that the surface of the blade after one day has lost its luster, and that the blade after 7 days has been oxidized red.
In order to judge whether or not it is suitable as an environmentally friendly liquid snow removing agent based on Examples 2 and 3 randomly selected in Examples 1 to 3, which are desirably designed as embodiments of the present invention, The results of Example 2 are shown in Tables 4 to 6 and the results of Example 3 are shown in Tables 7 and 8 below.
Table 4 above shows snowmelt spraying agents sprayed on roads and bridges to dissolve snow and ice. It is conducted according to EL.610, an environmental mark certification standard for snow removal agents, and KS I 3206: 2008, an industrial water test method. . The items of steel corrosion and melting test in Table 5 conducted in accordance with EL.610 are the same as those of Test Examples 2 and 3 described above. For details, refer to the above description. In addition, acute toxicity test for 48 hours using daphnia is a value of EC50 (median effective concentration: concentration of sample causing 50% of test organisms to inhibit swimming during the test period) And passed the certification standards. In the concrete hazard test items according to freezing and thawing, 5 cycles means 5 days and 10 cycles means 10 days. In both cases, the weight loss rate is less than 1.0%, which satisfies the certification criteria. In addition, the layer evaporation test conducted in accordance with the certification standard of KS I 3206: 2008 satisfies the certification standard.
Table 5 shows whether harmful elements are detected in the product in relation to the emission of hazardous substances. The evaluation is based on the following Table 6.
(Pb)
(As)
(CD)
(Hg)
(Cr)
(Cu)
(Ni)
(Zn)
[mg / kg]
The results of Table 7 evaluated based on Table 6 show that all harmful elements are not detected or detected below the reference value and satisfy the evaluation criteria.
Tables 7 and 8 below show the results of evaluation based on Example 2.
Table 7 above is based on EL.610 and KS I 3206: 2008 for snowmelt and snow melting agents sprayed on the roads and over the bridge. The items of steel corrosion and melting test in Table 7 conducted in accordance with EL.610 are the same test items and methods as those of Test Examples 2 and 3 described above. In addition, acute toxicity test for 48 hours using daphnia is a value of EC50 (median effective concentration: concentration of sample causing 50% of test organisms to inhibit swimming during the test period) And passed the certification standards. In the concrete hazard test items according to freezing and thawing, 5 cycles means 5 days and 10 cycles means 10 days. In both cases, the weight loss rate is less than 1.0%, which satisfies the certification criteria. In addition, the layer evaporation test conducted in accordance with the certification standard of KS I 3206: 2008 satisfies the certification standard.
Table 8 assesses whether harmful elements are detected in the product in relation to the emission of hazardous substances. The evaluation is based on Table 6. The results of Table 8 evaluated based on Table 6 show that all harmful elements are not detected or detected below the reference value and satisfy the evaluation criteria.
The present invention has been described above with reference to preferred embodiments and test examples. The present invention has been specifically described by way of Examples and Test Examples, but is not intended to limit the present invention, but merely to illustrate the present invention. Therefore, it will be apparent to those skilled in the art that the scope of the present invention is not limited by these embodiments in accordance with the gist of the present invention. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.
Claims (5)
Nitric acid aqueous solution and acetic acid aqueous solution into a stirrer;
A magnesium oxide charging step of charging 10 to 20% by weight of magnesium oxide into an agitator charged with the condensed acid;
A stirring step of stirring the mixed acid and the magnesium oxide;
A measuring step of measuring the pH of the substance produced by the stirring;
Filtering the material produced by the agitation by passing the material produced by the agitation through a filtration device capable of blocking a solid material when the measurement result is in the range of pH 7.0 to 7.5; And
And a discharging step of discharging the resultant in a liquid state filtered by the filtration apparatus as an environmentally friendly liquid snow removing agent.
Wherein when the measurement result is out of the range of pH 7.0 to 7.5, the agitation step is re-executed and then the measurement step is re-executed.
80 to 90% by weight of condensed acid including nitric acid aqueous solution and acetic acid aqueous solution; And
And 10 to 20% by weight of solid magnesium oxide.
Wherein the concentration of the aqueous nitric acid solution is 12 to 20%, the concentration of the aqueous acetic acid solution is 20 to 30%, and the concentration of the magnesium oxide is 86 to 95%.
Wherein the condensed acid is a mixture of an aqueous nitric acid solution and an aqueous acetic acid solution mixed at a ratio of 1: 1.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108018025A (en) * | 2017-12-07 | 2018-05-11 | 申东冬 | A kind of preparation method of environment protection liquid deicing salt |
| CN108084963A (en) * | 2017-12-07 | 2018-05-29 | 申东冬 | A kind of preparation method of magnesium salts environment protection liquid deicing salt |
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| JPH09241208A (en) * | 1996-03-08 | 1997-09-16 | Denki Kagaku Kogyo Kk | Production of calcium magnesium acetate double salt |
| JP2008163099A (en) | 2006-12-27 | 2008-07-17 | Kankyo Frontier:Kk | Snow melting agent and method for producing the same |
| KR101315618B1 (en) | 2013-03-25 | 2013-10-08 | (주)즐거운미래 | An eco-friendly composition for liquid type deicer having improved corrosiveness |
| KR101361136B1 (en) | 2013-12-13 | 2014-02-12 | 김창욱 | Method of manufacturing liquid type deicer |
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| JPH09241208A (en) * | 1996-03-08 | 1997-09-16 | Denki Kagaku Kogyo Kk | Production of calcium magnesium acetate double salt |
| JP2008163099A (en) | 2006-12-27 | 2008-07-17 | Kankyo Frontier:Kk | Snow melting agent and method for producing the same |
| KR101315618B1 (en) | 2013-03-25 | 2013-10-08 | (주)즐거운미래 | An eco-friendly composition for liquid type deicer having improved corrosiveness |
| KR101361136B1 (en) | 2013-12-13 | 2014-02-12 | 김창욱 | Method of manufacturing liquid type deicer |
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| CN108018025A (en) * | 2017-12-07 | 2018-05-11 | 申东冬 | A kind of preparation method of environment protection liquid deicing salt |
| CN108084963A (en) * | 2017-12-07 | 2018-05-29 | 申东冬 | A kind of preparation method of magnesium salts environment protection liquid deicing salt |
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