JP5648194B2 - Method for stabilizing anticorrosive and stabilized anticorrosive obtained thereby - Google Patents
Method for stabilizing anticorrosive and stabilized anticorrosive obtained thereby Download PDFInfo
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- JP5648194B2 JP5648194B2 JP2008285535A JP2008285535A JP5648194B2 JP 5648194 B2 JP5648194 B2 JP 5648194B2 JP 2008285535 A JP2008285535 A JP 2008285535A JP 2008285535 A JP2008285535 A JP 2008285535A JP 5648194 B2 JP5648194 B2 JP 5648194B2
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- 238000000034 method Methods 0.000 title claims description 13
- 230000000087 stabilizing effect Effects 0.000 title claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- 239000013078 crystal Substances 0.000 claims description 19
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 18
- 239000004480 active ingredient Substances 0.000 claims description 17
- 238000001556 precipitation Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 11
- 238000003860 storage Methods 0.000 claims description 11
- 239000002253 acid Substances 0.000 claims description 10
- ABLZXFCXXLZCGV-UHFFFAOYSA-N Phosphorous acid Chemical compound OP(O)=O ABLZXFCXXLZCGV-UHFFFAOYSA-N 0.000 claims description 8
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 8
- BWGBIGLMQJPOEE-UHFFFAOYSA-M sodium;phosphonoformate Chemical compound [Na+].OP(O)(=O)C([O-])=O BWGBIGLMQJPOEE-UHFFFAOYSA-M 0.000 claims description 8
- YSMRWXYRXBRSND-UHFFFAOYSA-N TOTP Chemical compound CC1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C YSMRWXYRXBRSND-UHFFFAOYSA-N 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 claims description 5
- 239000003112 inhibitor Substances 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 4
- KMDMOMDSEVTJTI-UHFFFAOYSA-N 2-phosphonobutanedioic acid Chemical compound OC(=O)CC(C(O)=O)P(O)(O)=O KMDMOMDSEVTJTI-UHFFFAOYSA-N 0.000 claims description 3
- FLXLXHMWYMTPKP-UHFFFAOYSA-N 1-phosphonobutane-1,2,3,4-tetracarboxylic acid Chemical compound OC(=O)CC(C(O)=O)C(C(O)=O)C(C(O)=O)P(O)(O)=O FLXLXHMWYMTPKP-UHFFFAOYSA-N 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims 1
- 229940079593 drug Drugs 0.000 description 9
- 239000003814 drug Substances 0.000 description 9
- 239000011574 phosphorus Substances 0.000 description 9
- 229910052698 phosphorus Inorganic materials 0.000 description 9
- -1 phosphorus compound Chemical class 0.000 description 9
- 238000009472 formulation Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 235000011007 phosphoric acid Nutrition 0.000 description 7
- ZJAOAACCNHFJAH-UHFFFAOYSA-N phosphonoformic acid Chemical compound OC(=O)P(O)(O)=O ZJAOAACCNHFJAH-UHFFFAOYSA-N 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical compound OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- 229960005102 foscarnet Drugs 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000013112 stability test Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- LMHAGAHDHRQIMB-UHFFFAOYSA-N 1,2-dichloro-1,2,3,3,4,4-hexafluorocyclobutane Chemical compound FC1(F)C(F)(F)C(F)(Cl)C1(F)Cl LMHAGAHDHRQIMB-UHFFFAOYSA-N 0.000 description 1
- OVSKIKFHRZPJSS-UHFFFAOYSA-N 2,4-D Chemical compound OC(=O)COC1=CC=C(Cl)C=C1Cl OVSKIKFHRZPJSS-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 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 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- UEZVMMHDMIWARA-UHFFFAOYSA-N Metaphosphoric acid Chemical compound OP(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-N 0.000 description 1
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 241000220010 Rhode Species 0.000 description 1
- YDHWWBZFRZWVHO-UHFFFAOYSA-N [hydroxy(phosphonooxy)phosphoryl] phosphono hydrogen phosphate Chemical compound OP(O)(=O)OP(O)(=O)OP(O)(=O)OP(O)(O)=O YDHWWBZFRZWVHO-UHFFFAOYSA-N 0.000 description 1
- UOKRBSXOBUKDGE-UHFFFAOYSA-N butylphosphonic acid Chemical compound CCCCP(O)(O)=O UOKRBSXOBUKDGE-UHFFFAOYSA-N 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- XPPKVPWEQAFLFU-UHFFFAOYSA-N diphosphoric acid Chemical compound OP(O)(=O)OP(O)(O)=O XPPKVPWEQAFLFU-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 229940005657 pyrophosphoric acid Drugs 0.000 description 1
- 239000011833 salt mixture Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- UNXRWKVEANCORM-UHFFFAOYSA-N triphosphoric acid Chemical compound OP(O)(=O)OP(O)(=O)OP(O)(O)=O UNXRWKVEANCORM-UHFFFAOYSA-N 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 150000003752 zinc compounds Chemical class 0.000 description 1
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
本発明は、防食剤の安定化方法およびそれにより得られる安定化防食剤に関する。さらに詳しくは、本発明は、工業用冷却水系などで使用されるリン化合物系防食剤の有効成分の結晶析出や固化を防止して、防食剤に長期貯蔵安定性を付与し得る防食剤の安定化方法およびそれにより得られる安定化防食剤に関する。 The present invention relates to a method for stabilizing an anticorrosive and a stabilized anticorrosive obtained thereby. More specifically, the present invention provides an anticorrosive agent that can prevent long-term storage stability of the anticorrosive agent by preventing crystal precipitation and solidification of the active ingredient of the phosphorus compound anticorrosive agent used in industrial cooling water systems and the like. And a stabilized anticorrosive obtained thereby.
工業用冷却水系などでは、水系を構成する金属材料（鉄、軟鋼、鋳鉄など）と水とが常時接触しており、金属材料表面の腐食が発生し易い。このような腐食を防止するために、従来から種々の金属防食剤が提案され、使用されている。 In an industrial cooling water system or the like, the metal material (iron, mild steel, cast iron, etc.) constituting the water system is always in contact with water, and the metal material surface is likely to corrode. In order to prevent such corrosion, various metal anticorrosive agents have been proposed and used.
例えば、金属防食剤として、水溶性ホスホン酸またはその塩、ホスホノカルボン酸およびトリアゾールからなる腐食防止剤組成物が知られている（例えば、特開昭６２−１８９２号公報：特許文献１参照。）。
また、１−ヒドロキシエチリデン−１，１−ジホスホン酸および／またはその水溶性塩、特定のホスホノカルボン酸および／またはその水溶性塩、および水溶性亜鉛化合物とを有効成分として含有する、水系における金属類のスケール抑制を兼ねた腐食防止剤が知られている（例えば、特開昭６２−９６６８３号公報：特許文献２参照。）。
For example, a corrosion inhibitor composition comprising a water-soluble phosphonic acid or a salt thereof, a phosphonocarboxylic acid and a triazole is known as a metal anticorrosive (see, for example, JP-A-62-1892: Patent Document 1). ).
Further, in an aqueous system, containing 1-hydroxyethylidene-1,1-diphosphonic acid and / or a water-soluble salt thereof, a specific phosphonocarboxylic acid and / or a water-soluble salt thereof, and a water-soluble zinc compound as active ingredients. A corrosion inhibitor that also serves to suppress the scale of metals is known (see, for example, JP-A-62-96683: Patent Document 2).
しかしながら、上記のような有効成分としてリン化合物を含有する防食剤を長期間保管すると、結晶析出や製剤として固化する場合があるという問題があった。
これまでにこのようなリン化合物系防食剤の有効成分の結晶析出や固化を防止し、製剤を長期間安定化させる技術は開示されていない。
However, when an anticorrosive containing a phosphorus compound as an active ingredient as described above is stored for a long period of time, there is a problem that it may solidify as a crystal precipitate or a preparation.
So far, no technology has been disclosed for preventing the crystallisation and solidification of active ingredients of such phosphorus compound anticorrosives and stabilizing the preparation for a long period of time.
本発明は、リン化合物系防食剤の有効成分の結晶析出や固化を防止し、防食剤に長期貯蔵安定性を付与することを課題とする。 This invention makes it a subject to prevent the crystal precipitation and solidification of the active ingredient of a phosphorus compound type anticorrosive, and to provide long-term storage stability to an anticorrosive.
本発明者らは、リン化合物系防食剤における有効成分の結晶析出について鋭意研究を行った結果、予め強酸を用いてリン化合物系防食剤のｐＨを１．５以下に調整することにより、結晶析出を長期間防止し、製剤を安定化できることを見出し、本発明を完成するに到った。 As a result of intensive studies on the crystal precipitation of the active ingredient in the phosphorus compound anticorrosive agent, the present inventors have adjusted the pH of the phosphorus compound anticorrosive agent to 1.5 or lower using a strong acid in advance, thereby precipitating the crystal. It was found that the preparation can be stabilized for a long time and the present invention has been completed.
かくして、本発明によれば、Ｈ[ＣＨ(ＣＯＯＮａ)ＣＨ(ＣＯＯＮａ)]nＰＯ3Ｎａ2（ｎ＝１および２）で表される、ホスホノコハク酸＝四ナトリウム塩と１−ホスホノブタン−１，２，３，４−テトラカルボン酸＝六ナトリウム塩の混合物であるホスホノカルボン酸ナトリウムとリン酸または水溶性有機ホスホン酸とを有効成分として含有する防食剤に強酸を加えて前記防食剤のｐＨを１．５以下に調整して、前記防食剤の貯蔵時における前記有効成分の結晶析出を防止することを特徴とする防食剤の安定化方法が提供される。
また、本発明によれば、上記の防食剤の安定化方法により安定化されてなることを特徴とする安定化防食剤が提供される。
本明細書においては、「ホスホノカルボン酸ナトリウム」は、上記のように、Ｈ[ＣＨ(ＣＯＯＮａ)ＣＨ(ＣＯＯＮａ)]nＰＯ3Ｎａ2（ｎ＝１および２）で表される、ホスホノコハク酸＝四ナトリウム塩と１−ホスホノブタン−１，２，３，４−テトラカルボン酸＝六ナトリウム塩の混合物を意味する。
Thus, according to the present invention , phosphonosuccinic acid = tetrasodium salt and 1-phosphonobutane -1, 2 represented by H [CH (COONa) CH (COONa)] n PO 3 Na 2 (n = 1 and 2) , 3,4-tetracarboxylic acid = hexasodium salt mixture of sodium phosphonocarboxylate and phosphoric acid or water-soluble organic phosphonic acid as an active ingredient to add a strong acid to adjust the pH of the anticorrosive There is provided a method for stabilizing an anticorrosive, which is adjusted to 1.5 or less to prevent crystal precipitation of the active ingredient during storage of the anticorrosive.
Moreover, according to this invention, the stabilized anticorrosive characterized by being stabilized with said stabilization method of an anticorrosive is provided.
In the present specification, “sodium phosphonocarboxylate” means phosphonosuccinic acid represented by H [CH (COONa) CH (COONa)] n PO 3 Na 2 (n = 1 and 2) as described above. = A mixture of tetrasodium salt and 1-phosphonobutane-1,2,3,4-tetracarboxylic acid = hexasodium salt.
本発明によれば、リン化合物系防食剤の有効成分の結晶析出や固化を防止し、防食剤に長期貯蔵安定性を付与することができる。
すなわち、本発明によれば、工業用冷却水系などで使用されるリン化合物系防食剤の有効成分の結晶析出を１ヶ月以上防止することができ、産業上極めて有用である。
ADVANTAGE OF THE INVENTION According to this invention, the crystal precipitation and solidification of the active ingredient of a phosphorus compound type anticorrosive can be prevented, and long-term storage stability can be provided to an anticorrosive.
That is, according to the present invention, it is possible to prevent crystal precipitation of an active ingredient of a phosphorus compound anticorrosive used in an industrial cooling water system for more than one month, which is extremely useful industrially.
本発明の防食剤の安定化方法は、ホスホノカルボン酸ナトリウムとリン酸または水溶性有機ホスホン酸とを有効成分として含有する防食剤に強酸を加えて前記防食剤のｐＨを１．５以下に調整して、前記防食剤の貯蔵時における前記有効成分の結晶析出を防止することを特徴とする。 The method for stabilizing an anticorrosive agent of the present invention comprises adding a strong acid to an anticorrosive agent containing sodium phosphonocarboxylate and phosphoric acid or water-soluble organic phosphonic acid as active ingredients so that the pH of the anticorrosive agent is 1.5 or less. It adjusts and prevents crystal precipitation of the active ingredient at the time of storage of the anticorrosive.
本発明において、安定化の対象となる防食剤は、上記の有効成分を含有し、温度−５℃の条件下で２週間以内に結晶析出する防食剤である。 In the present invention, the anticorrosive agent to be stabilized is an anticorrosive agent containing the above-mentioned active ingredient and crystallizing within 2 weeks under the condition of a temperature of -5 ° C.
ホスホノカルボン酸ナトリウムとしては、通常、工業用として市販されているものが挙げられる。例えば、ローディアジャパン株式会社製の４０％ホスホノカルボン酸ナトリウム（微リン防錆剤、商品名：BRICORR 288）が挙げられる。 Examples of sodium phosphonocarboxylate include those commercially available for industrial use. For example, 40% sodium phosphonocarboxylate (Rhode rust inhibitor, trade name: BRICORR 288) manufactured by Rhodia Japan Co., Ltd. may be mentioned.
リン酸としては、オルトリン酸、メタリン酸、縮合リン酸、ピロリン酸、トリポリリン酸、テトラリン酸、ヘキサメタリン酸などが挙げられる。
水溶性有機ホスホン酸としては、１−ヒドロキシエチリデン−１，１−ジホスホン酸、２−ヒドロキシホスホノ酢酸、２−ホスホノブタン−１，２，４−トリカルボン酸（ＰＢＴＣ）などが挙げられる。
Examples of phosphoric acid include orthophosphoric acid, metaphosphoric acid, condensed phosphoric acid, pyrophosphoric acid, tripolyphosphoric acid, tetraphosphoric acid, and hexametaphosphoric acid.
Examples of the water-soluble organic phosphonic acid include 1-hydroxyethylidene-1,1-diphosphonic acid, 2-hydroxyphosphonoacetic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC), and the like.
通常、濃度２０〜３２％程度のホスホノカルボン酸ナトリウム、濃度５〜２５％程度のリン酸または水溶性有機ホスホン酸を含む防食剤において、結晶析出が起こり易く、このような防食剤に対して本発明の方法は有効である。 Usually, in an anticorrosive containing sodium phosphonocarboxylate having a concentration of about 20 to 32%, phosphoric acid having a concentration of about 5 to 25% or a water-soluble organic phosphonic acid, crystal precipitation is likely to occur. The method of the present invention is effective.
本発明では、防食剤に強酸を加えてそのｐＨを１．５以下に調整する。
具体的には、有効成分を用いて調製した防食剤に、そのｐＨを公知の方法で測定しながら強酸を添加すればよい。
In the present invention, a strong acid is added to the anticorrosive agent to adjust its pH to 1.5 or less.
Specifically, a strong acid may be added to an anticorrosive prepared using an active ingredient while measuring its pH by a known method.
本発明で用いられる強酸としては、防食剤のｐＨを１．５以下に調整し得る酸であれば特に制限されず、塩酸、硫酸、硝酸などが挙げられる。 The strong acid used in the present invention is not particularly limited as long as it is an acid capable of adjusting the pH of the anticorrosive to 1.5 or lower, and examples thereof include hydrochloric acid, sulfuric acid, nitric acid and the like.
本発明の方法によれば、リン化合物系防食剤の有効成分の結晶析出や固化を防止して、防食剤に長期貯蔵安定性を付与することができる。
すなわち、本発明の方法により処理された安定化防食剤は、温度−５℃の条件下で貯蔵（保存）されても２週間以内に結晶析出することがない。
According to the method of the present invention, it is possible to prevent crystal precipitation and solidification of the active ingredient of the phosphorus compound anticorrosive agent and to impart long-term storage stability to the anticorrosive agent.
That is, the stabilized anticorrosive treated by the method of the present invention does not crystallize within 2 weeks even when stored (preserved) at a temperature of -5 ° C.
本発明を製剤例および試験例により具体的に説明するが、本発明はこれらの製剤例および試験例により限定されるものではない。 The present invention will be specifically described with formulation examples and test examples, but the present invention is not limited to these formulation examples and test examples.
（製剤例１〜１０）
表１に示す配合比（重量部）で４０％ホスホノカルボン酸ナトリウムと７５％リン酸またはＰＢＴＣ（２−ホスホノブタン−１，２，４−トリカルボン酸）とを水に加えて溶解させて各製剤を得た。
(Formulation examples 1 to 10)
Each formulation was prepared by adding 40% sodium phosphonocarboxylate and 75% phosphoric acid or PBTC (2-phosphonobutane-1,2,4-tricarboxylic acid) to water and dissolving them in the mixing ratio (parts by weight) shown in Table 1. Got.
試験例１（製剤の貯蔵安定性確認試験）
製剤例１〜１０の各薬剤について、ｐＨ未調整時の貯蔵（保存）安定性試験を行った。
容量１００ｍｌのガラス容器に各薬剤を約１００ｍｌずつ入れ、温度−５℃の条件下で１週間静置し、経日的に薬剤の状態を目視観察した。
目視観察において、製剤例１〜４の薬剤については１〜２週間以内に結晶析出が観察され、製剤例５および６については１日経過後に結晶析出が観察された。
Test Example 1 (Production Storage Stability Confirmation Test)
About each chemical | medical agent of formulation example 1-10, the storage (preservation) stability test at the time of pH non-adjustment was done.
About 100 ml of each drug was placed in a glass container with a capacity of 100 ml, and left to stand for 1 week under the condition of a temperature of −5 ° C., and the state of the drug was visually observed over time.
In visual observation, for the drugs of Formulation Examples 1 to 4, crystal precipitation was observed within 1 to 2 weeks, and for Formulation Examples 5 and 6, crystal deposition was observed after 1 day.
試験例２（結晶析出製剤の貯蔵安定性確認試験）
製剤例１〜６の各薬剤について、ｐＨ調整時の貯蔵（保存）安定性試験を行った。
容量１００ｍｌのガラス容器に各薬剤を約１００ｍｌずつ入れ、さらに塩酸を加えて表２に示すｐＨになるように調整した。得られた各薬剤を温度−５℃の条件下で１ヶ月間静置し、経日的に薬剤の状態を目視観察した。
Test Example 2 (Storage stability confirmation test for crystal-deposited preparation)
About each chemical | medical agent of the formulation examples 1-6, the storage (preservation) stability test at the time of pH adjustment was done.
About 100 ml of each drug was placed in a glass container having a capacity of 100 ml, and hydrochloric acid was further added to adjust the pH as shown in Table 2. Each obtained drug was allowed to stand for 1 month under the condition of a temperature of −5 ° C., and the state of the drug was visually observed over time.
得られた結果を表２に示す。
表２において、「○」は試験期間中（１ヶ月間）に結晶析出が観察されなかったもの、「×」は試験期間中に結晶析出が観察されたものものを示し、括弧内の数字は結晶析出が観察された経過日数を示す。
The obtained results are shown in Table 2.
In Table 2, “◯” indicates that no crystal precipitation was observed during the test period (one month), “×” indicates that crystal precipitation was observed during the test period, and the numbers in parentheses are Indicates the number of days that crystal precipitation was observed.
表２の結果から、薬剤のｐＨを１．５以下に調整することにより、薬剤の結晶析出が観察されず、１ヶ月間安定に貯蔵できることがわかる。 From the results in Table 2, it can be seen that by adjusting the pH of the drug to 1.5 or less, crystal precipitation of the drug is not observed and the drug can be stably stored for one month.
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