JP2001153861A - Measuring method of total acid number - Google Patents
Measuring method of total acid numberInfo
- Publication number
- JP2001153861A JP2001153861A JP33942399A JP33942399A JP2001153861A JP 2001153861 A JP2001153861 A JP 2001153861A JP 33942399 A JP33942399 A JP 33942399A JP 33942399 A JP33942399 A JP 33942399A JP 2001153861 A JP2001153861 A JP 2001153861A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- total acid
- mixed solvent
- acid value
- measured
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002253 acid Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 14
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 45
- 239000012046 mixed solvent Substances 0.000 claims abstract description 34
- 238000002835 absorbance Methods 0.000 claims abstract description 12
- 239000002904 solvent Substances 0.000 claims abstract description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 17
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 10
- 230000002378 acidificating effect Effects 0.000 claims description 5
- NUHCTOLBWMJMLX-UHFFFAOYSA-N bromothymol blue Chemical compound BrC1=C(O)C(C(C)C)=CC(C2(C3=CC=CC=C3S(=O)(=O)O2)C=2C(=C(Br)C(O)=C(C(C)C)C=2)C)=C1C NUHCTOLBWMJMLX-UHFFFAOYSA-N 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000000691 measurement method Methods 0.000 claims 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Chemical compound BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 abstract 1
- PRZSXZWFJHEZBJ-UHFFFAOYSA-N thymol blue Chemical compound C1=C(O)C(C(C)C)=CC(C2(C3=CC=CC=C3S(=O)(=O)O2)C=2C(=CC(O)=C(C(C)C)C=2)C)=C1C PRZSXZWFJHEZBJ-UHFFFAOYSA-N 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 33
- 235000019198 oils Nutrition 0.000 description 33
- 239000000203 mixture Substances 0.000 description 6
- 229930195733 hydrocarbon Natural products 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- 238000006386 neutralization reaction Methods 0.000 description 5
- 238000004448 titration Methods 0.000 description 5
- 238000011088 calibration curve Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000002845 discoloration Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 238000004737 colorimetric analysis Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 102100032566 Carbonic anhydrase-related protein 10 Human genes 0.000 description 1
- 101100321669 Fagopyrum esculentum FA02 gene Proteins 0.000 description 1
- 101000867836 Homo sapiens Carbonic anhydrase-related protein 10 Proteins 0.000 description 1
- 238000011481 absorbance measurement Methods 0.000 description 1
- 239000002696 acid base indicator Substances 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- AOADSHDCARXSGL-ZMIIQOOPSA-M alkali blue 4B Chemical compound CC1=CC(/C(\C(C=C2)=CC=C2NC2=CC=CC=C2S([O-])(=O)=O)=C(\C=C2)/C=C/C\2=N\C2=CC=CC=C2)=CC=C1N.[Na+] AOADSHDCARXSGL-ZMIIQOOPSA-M 0.000 description 1
- 125000005233 alkylalcohol group Chemical group 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000010692 aromatic oil Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000010735 electrical insulating oil Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 125000005456 glyceride group Chemical group 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 239000011877 solvent mixture Substances 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、油の全酸価を測定
する方法に関する。[0001] The present invention relates to a method for measuring the total acid value of oil.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】変圧器
などの油入機器においては、経年に伴い、電気絶縁油が
酸化劣化するため、該絶縁油を保守管理すべく、全酸価
の測定が行われている。この全酸価の測定法としては、
従来より、ＪＩＳ Ｃ ２１０１に規定されるようなア
ルカリブルー６Ｂ指示薬を用いた中和滴定法が知られて
いるが、該中和滴定法では変色の判断が困難で、個人誤
差が多いという問題があった。近年では、中和終点を光
の波長を利用して判断する全酸価自動測定装置も用いら
れるようになったが、該装置は高価であるとともに、据
え置き形であり、作業現場での全酸価測定には簡単に利
用できないものであった。2. Description of the Related Art In an oil-filled device such as a transformer, the electrical insulating oil is oxidized and deteriorated with the passage of time, so that the total acid value is measured in order to maintain the insulating oil. Has been done. As a method of measuring the total acid value,
Conventionally, a neutralization titration method using an alkali blue 6B indicator specified in JIS C 2101 has been known. However, the neutralization titration method has a problem that it is difficult to judge discoloration and there are many individual errors. there were. In recent years, a total acid value automatic measurement device that determines the neutralization end point using the wavelength of light has also been used, but this device is expensive and is of a stationary type, and the total acid value at the work site is high. It was not readily available for titration.
【０００３】したがって、本発明の課題は、絶縁油等の
油の全酸価を高い精度でかつ簡易に測定することのでき
る方法を提供することである。[0003] Therefore, an object of the present invention is to provide a method capable of easily and easily measuring the total acid value of oil such as insulating oil.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、ブロームチモールブルー、水酸化カリウ
ム及び溶媒を含む混合溶剤と、測定対象である油とを混
合し、該油中の全酸性成分を該混合溶剤に抽出した後、
該混合溶剤の吸光度を測定することにより、該油の全酸
価を測定することを特徴とする全酸価測定法を提供する
ものである。本発明においては、吸光度を利用して全酸
価を測定するため、中和滴定法のように変色の判断を目
視で行うことがなく、したがって個人誤差がなく、精確
に全酸価を測定することができる。また、高価な据え置
き形の装置も必要としないため、作業現場で簡単に実施
できるという利点がある。In order to solve the above-mentioned problems, the present invention provides a method of mixing a mixed solvent containing bromthymol blue, potassium hydroxide and a solvent with an oil to be measured. After extracting all acidic components into the mixed solvent,
An object of the present invention is to provide a method for measuring a total acid value, wherein the total acid value of the oil is measured by measuring the absorbance of the mixed solvent. In the present invention, since the total acid value is measured using the absorbance, the determination of discoloration is not visually performed as in the neutralization titration method, and therefore, there is no individual error, and the total acid value is accurately measured. be able to. Further, since an expensive stationary type device is not required, there is an advantage that it can be easily implemented at a work site.
【０００５】上記溶媒はエタノールとイソプロパノール
と水との混合溶媒であるのが好ましく、また、上記水酸
化カリウムの量は、所定の全酸価において前記混合溶剤
が変色するような量に調整されているのが好ましい。さ
らに、上記油は油入変圧器の絶縁油であってもよく、そ
の場合、上記水酸化カリウムの量は、全酸価が０．４前
後のときに上記混合溶剤が青色から黄色に変色するよう
に調整されているのが好ましい。[0005] The solvent is preferably a mixed solvent of ethanol, isopropanol and water, and the amount of potassium hydroxide is adjusted to such an amount that the mixed solvent changes color at a predetermined total acid value. Is preferred. Further, the oil may be an insulating oil of an oil-immersed transformer, in which case the amount of the potassium hydroxide is such that the mixed solvent changes color from blue to yellow when the total acid value is around 0.4. It is preferable that it is adjusted as follows.
【０００６】[0006]
【発明の実施の形態】以下、本発明を詳細に説明する。
本発明で測定対象とする油の種類は、特に限定されるこ
となく、脂肪酸のグリセリドを主成分とする動植物油、
炭化水素からなる石油、あるいはアルコール、ケトン、
アルデヒド等からなる芳香油等が例示され、用途の観点
からも特に限定されることなく、例えば、潤滑油、切削
油、離型用油、絶縁油、食用油等を測定対象油とするこ
とができる。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The type of oil to be measured in the present invention is not particularly limited, animal and vegetable oils containing glyceride of fatty acid as a main component,
Hydrocarbon petroleum, or alcohol, ketone,
Aromatic oils and the like composed of aldehydes and the like are exemplified, and are not particularly limited from the viewpoint of use. it can.
【０００７】これら種々の油の中でも、ナフテン系炭化
水素、芳香族炭化水素及びパラフィン系炭化水素を含む
炭化水素混合物や、パラフィン系炭化水素からなる油入
変圧器の絶縁油は、絶縁破壊電圧の維持や変圧器の事故
を防止するために、全酸価を高い精度で測定する必要が
あるため、本発明の測定対象として好ましい。[0007] Among these various oils, hydrocarbon mixtures containing naphthenic hydrocarbons, aromatic hydrocarbons and paraffinic hydrocarbons, and insulating oils for oil-immersed transformers composed of paraffinic hydrocarbons have a low breakdown voltage. Since it is necessary to measure the total acid value with high accuracy in order to maintain and prevent an accident of a transformer, it is preferable as a measurement object of the present invention.
【０００８】本発明では、油中の全酸性成分を抽出する
ための溶剤として、ブロームチモールブルー（ＢＴ
Ｂ）、水酸化カリウム及び溶媒を含む混合溶剤を使用す
る。ＢＴＢは酸塩基指示薬であり、変色の度合いが吸光
度測定の精度の点で優れているため、本発明では指示薬
として該ＢＴＢを使用する。上記混合溶媒中におけるＢ
ＴＢの含有量は、０．００１〜０．０５重量％であるの
が好ましく、特に０．００８重量％前後であるのが好ま
しい。In the present invention, bromthymol blue (BT) is used as a solvent for extracting all acidic components in oil.
A mixed solvent containing B), potassium hydroxide and a solvent is used. BTB is an acid-base indicator, and since the degree of discoloration is excellent in terms of the accuracy of absorbance measurement, BTB is used as the indicator in the present invention. B in the above mixed solvent
The content of TB is preferably from 0.001 to 0.05% by weight, particularly preferably about 0.008% by weight.
【０００９】上記水酸化カリウムは、所定の全酸価にお
いて該混合溶剤が変色するように含有量を調整しておく
のが好ましい。例えば、測定対象油として油入変圧器の
絶縁油を選択する場合、該水酸化カリウムの量は、全酸
価が０．４前後のときに該混合溶剤が青色から黄色に変
色するように調整しておくのが好ましい。全酸価が０．
４以上の絶縁油は劣化が激しく交換を必要とすることか
ら、このように該水酸化カリウムの量を調整しておく
と、０．４付近において特に高い精度で絶縁油の全酸価
を測定することができ、該絶縁油の交換が必要か否かを
確実に判断することができる。なお、このような水酸化
カリウムの量は、実験・計算により導き出すことができ
る。The content of the potassium hydroxide is preferably adjusted so that the mixed solvent changes color at a predetermined total acid value. For example, when the insulating oil of the oil-filled transformer is selected as the oil to be measured, the amount of the potassium hydroxide is adjusted so that the mixed solvent changes color from blue to yellow when the total acid value is around 0.4. It is preferable to keep it. The total acid value is 0.
Since the insulating oil of 4 or more deteriorates greatly and needs to be replaced, the total acid value of the insulating oil can be measured with particularly high accuracy around 0.4 by adjusting the amount of potassium hydroxide in this way. It is possible to reliably determine whether the insulating oil needs to be replaced. In addition, the amount of such potassium hydroxide can be derived by experiment and calculation.
【００１０】上記溶媒としては、アルコールと水との混
合溶媒を使用するのが好ましく、アルコール：水の混合
比（重量比）は、１００：６〜１００：８であるのが好
ましい。また、アルコールとしては、メタノール、エタ
ノール、ｎ−プロパノール、イソプロパノール、ブタノ
ール等の炭素数１〜４のアルキルアルコールの１種又は
２種以上を使用するのが好ましく、特に分層の早さや酸
性成分の抽出効率の点からエタノールとイソプロパノー
ルとの混合物を使用するのが好ましい。その場合、エタ
ノール：イソプロパノールの混合比（重量比）は、１：
２〜２：１であるのが好ましい。As the solvent, a mixed solvent of alcohol and water is preferably used, and the mixing ratio (weight ratio) of alcohol: water is preferably 100: 6 to 100: 8. As the alcohol, it is preferable to use one or more of alkyl alcohols having 1 to 4 carbon atoms such as methanol, ethanol, n-propanol, isopropanol, and butanol. From the viewpoint of extraction efficiency, it is preferable to use a mixture of ethanol and isopropanol. In that case, the mixing ratio (weight ratio) of ethanol: isopropanol is 1:
Preferably, it is 2 to 2: 1.
【００１１】本発明の方法では、最初に、上記混合溶剤
と測定対象である油とを混合する。該混合溶剤と油との
混合比（容量比）は、１：１〜６：１であるのが好まし
く、特に１：１〜４：１であるのが好ましい。In the method of the present invention, first, the mixed solvent and the oil to be measured are mixed. The mixing ratio (volume ratio) of the mixed solvent and oil is preferably 1: 1 to 6: 1, and particularly preferably 1: 1 to 4: 1.
【００１２】上記混合溶剤と油とを混合したら、十分に
振とうして該油中の全酸性成分を該混合溶剤中に抽出す
る。振とう後、静置すると、上層の混合溶剤と下層の油
とに分離するため、該混合溶剤を一定量採取し、その吸
光度、好ましくは波長６３３ｎｍにおける吸光度を測定
する。該吸光度の測定は、通常、分光光度計を使用して
行うことができ、あらかじめ標準試料によって作成した
全酸価−吸光度の検量線と照らし合わせることにより、
高い精度で全酸価を測定することができる。After the mixed solvent and the oil are mixed, the mixture is sufficiently shaken to extract all acidic components in the oil into the mixed solvent. After shaking, the mixture is allowed to stand, and then separated into an upper layer mixed solvent and a lower layer oil. Therefore, a fixed amount of the mixed solvent is sampled, and its absorbance, preferably at a wavelength of 633 nm, is measured. The measurement of the absorbance can be usually performed using a spectrophotometer, and by comparing with a total acid value-absorbance calibration curve prepared in advance with a standard sample,
The total acid value can be measured with high accuracy.
【００１３】なお、酸性成分の抽出によって変色した上
記混合溶剤について、比色法を適用することにより全酸
価を測定することも可能ではあるが、比色法では吸光度
を利用した本発明の方法ほど精確に全酸価を測定するこ
とはできない。It is possible to measure the total acid value by applying a colorimetric method to the mixed solvent whose color has been changed by the extraction of the acidic component. However, in the colorimetric method, the method of the present invention utilizing the absorbance is used. It is not possible to measure the total acid number as accurately.
【００１４】[0014]
【実施例】以下、実施例により本発明を更に具体的に説
明するが、本発明の範囲はこれらの実施例に限定される
ものではない。EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples, but the scope of the present invention is not limited to these Examples.
【００１５】〔実施例１〕 (1) 混合溶剤の調製 エタノール５８５．０ｇと、イソプロパノール５８５．
０ｇと、精製水１３０．０ｇとを混合し、これに０．１
Ｎエタノール性ＫＯＨを１．６５ｍｌ添加した。得られ
た混合液９００ｍｌに、ブロームチモールブルー粉末を
０．１０ｇ、ＫＯＨを０．２０９３ｇ溶解させ、１リッ
トルにメスアップし、これを混合溶剤とした。なお、該
混合溶剤に含まれるＫＯＨの量は、全酸価が０．４０の
ときに該混合溶剤が青色から黄色に変色するように調整
された量であった。Example 1 (1) Preparation of mixed solvent 585.0 g of ethanol and 585.
0 g and 130.0 g of purified water.
1.65 ml of N ethanolic KOH was added. In 900 ml of the obtained mixture, 0.10 g of bromthymol blue powder and 0.2093 g of KOH were dissolved, and the mixture was made up to 1 liter, and this was used as a mixed solvent. The amount of KOH contained in the mixed solvent was adjusted so that the mixed solvent changed color from blue to yellow when the total acid value was 0.40.
【００１６】(2) 検量線の作成 １種２号の新油にオクチル酸を添加して、全酸価が０．
０１、０．０５、０．１０、０．２０、０．３０、０．
４０及び０．０５の絶縁油を調製した。上記混合溶剤を
１０ｍｌ収容したスクリュービン中に、該絶縁油１０ｍ
ｌを注入し、よく振とうした。(2) Preparation of a calibration curve Octylic acid was added to Type 1 No. 2 new oil to obtain a total acid value of 0.1.
01, 0.05, 0.10, 0.20, 0.30,.
Forty and 0.05 insulating oils were prepared. 10 m of the insulating oil was placed in a screw bottle containing 10 ml of the above mixed solvent.
1 was injected and shaken well.
【００１７】分離した上層の混合溶剤を石英のセルに移
し、分光光度計（島津製作所製，ＵＶ−１２００）を使
用して６３３ｎｍにおける吸光度を測定したところ、表
１に示すような結果が得られた。The separated upper layer mixed solvent was transferred to a quartz cell, and the absorbance at 633 nm was measured using a spectrophotometer (UV-1200, manufactured by Shimadzu Corporation). The results shown in Table 1 were obtained. Was.
【００１８】[0018]
【表１】 [Table 1]
【００１９】この結果、全酸価と吸光度との間には、図
１に示すような関係があることが分かった。As a result, it was found that there was a relationship as shown in FIG. 1 between the total acid value and the absorbance.
【００２０】(3) フィールドテスト 実際に稼働している８台の変圧器から絶縁油を抜き出
し、上記と同様の混合溶剤を１０ｍｌ収容したスクリュ
ービン中に、該絶縁油１０ｍｌを注入し、よく振とうし
た。(3) Field test Insulating oil was extracted from the eight transformers that were actually operating, and 10 ml of the insulating oil was poured into a screw bottle containing 10 ml of the same mixed solvent as described above. I'm sorry.
【００２１】分離した上層の混合溶剤を石英のセルに移
し、分光光度計（島津製作所製，ＵＶ−１２００）を使
用して６３３ｎｍにおける吸光度を測定したところ、表
２に示すような結果が得られた。The separated upper solvent mixture was transferred to a quartz cell, and the absorbance at 633 nm was measured using a spectrophotometer (UV-1200, manufactured by Shimadzu Corporation). The results shown in Table 2 were obtained. Was.
【００２２】この結果及び図１の検量線より、各絶縁油
の全酸価は、それぞれ表２に示すような値であると測定
された。From the results and the calibration curve of FIG. 1, the total acid value of each insulating oil was measured as shown in Table 2.
【００２３】なお、上記各絶縁油について、ＪＩＳ法
（ＪＩＳ Ｃ ２１０１に規定されるアルカリブルー６
Ｂ指示薬を用いた中和滴定法）により全酸価を測定した
ところ、表２に示すような結果が得られた。Each of the above insulating oils was prepared according to the JIS method (Alkali Blue 6 specified in JIS C 2101).
When the total acid value was measured by a neutralization titration method using a B indicator, the results shown in Table 2 were obtained.
【００２４】[0024]
【表２】 [Table 2]
【００２５】[0025]
【発明の効果】本発明によれば、油の全酸価を簡単にか
つ高い精度で測定することができる。According to the present invention, the total acid value of oil can be measured easily and with high accuracy.
【図１】実施例１における吸光度と絶縁油の全酸価との
関係を示す検量線である。FIG. 1 is a calibration curve showing a relationship between absorbance and total acid value of insulating oil in Example 1.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2G042 AA01 AA05 BD20 BE01 CA10 CB03 EA03 FA02 FA11 FB02 2G054 AA02 AB10 BB01 CA30 CD01 CE01 CE08 EA04 GB01 JA06 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 2G042 AA01 AA05 BD20 BE01 CA10 CB03 EA03 FA02 FA11 FB02 2G054 AA02 AB10 BB01 CA30 CD01 CE01 CE08 EA04 GB01 JA06
Claims (5)
ム及び溶媒を含む混合溶剤と、測定対象である油とを混
合し、該油中の全酸性成分を該混合溶剤に抽出した後、
該混合溶剤の吸光度を測定することにより、該油の全酸
価を測定することを特徴とする全酸価測定法。1. A mixed solvent containing bromthymol blue, potassium hydroxide and a solvent, and an oil to be measured are mixed, and all acidic components in the oil are extracted into the mixed solvent.
A total acid value measurement method, wherein the total acid value of the oil is measured by measuring the absorbance of the mixed solvent.
ルと水との混合溶媒である請求項１記載の全酸価測定
法。2. The method according to claim 1, wherein the solvent is a mixed solvent of ethanol, isopropanol and water.
価において前記混合溶剤が変色するような量に調整され
ている請求項１又は２記載の全酸価測定法。3. The method for measuring a total acid value according to claim 1, wherein the amount of the potassium hydroxide is adjusted so that the mixed solvent discolors at a predetermined total acid value.
項１乃至３いずれか記載の全酸価測定法。4. The method according to claim 1, wherein the oil is an insulating oil for an oil-immersed transformer.
０．４前後のときに前記混合溶剤が青色から黄色に変色
するように調整されている請求項４記載の全酸価測定
法。5. The method according to claim 4, wherein the amount of the potassium hydroxide is adjusted so that the mixed solvent changes color from blue to yellow when the total acid value is around 0.4. .
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|---|---|---|---|
| JP33942399A JP2001153861A (en) | 1999-11-30 | 1999-11-30 | Measuring method of total acid number |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33942399A JP2001153861A (en) | 1999-11-30 | 1999-11-30 | Measuring method of total acid number |
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| Publication Number | Publication Date |
|---|---|
| JP2001153861A true JP2001153861A (en) | 2001-06-08 |
Family
ID=18327337
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735682A (en) * | 2012-06-12 | 2012-10-17 | 广东电网公司电力科学研究院 | Accurate and simple transformer oil acid value detection method |
| CN113533628A (en) * | 2021-07-19 | 2021-10-22 | 西安热工研究院有限公司 | Method for detecting acid value of synthetic lubricating oil |
| CN113945679A (en) * | 2021-10-22 | 2022-01-18 | 西安热工研究院有限公司 | A kind of automatic detection method of acid value of synthetic lubricating oil |
| CN114414558A (en) * | 2021-12-20 | 2022-04-29 | 山东东岳未来氢能材料股份有限公司 | Method for measuring acid value content of aqueous fluorocarbon resin |
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|---|---|---|---|---|
| JPS5293397A (en) * | 1976-01-31 | 1977-08-05 | Sugiyama Sangyo Kagaku Kenk | Simple measuring method of degree of deterioration in heated oil and fat |
| JPS5782763A (en) * | 1980-11-12 | 1982-05-24 | New Japan Chem Co Ltd | Method for simple decision of total acid value of electric insulating oil, lubricating oils |
| JPH04127058A (en) * | 1990-09-19 | 1992-04-28 | Nippon Steel Corp | Automatic analysis method and device for acid value and saponification value of oil |
| JPH09100712A (en) * | 1995-10-04 | 1997-04-15 | Fujikura Ltd | Method for predicting lubricating oil life and lubricating oil life predicting device using this method |
-
1999
- 1999-11-30 JP JP33942399A patent/JP2001153861A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5293397A (en) * | 1976-01-31 | 1977-08-05 | Sugiyama Sangyo Kagaku Kenk | Simple measuring method of degree of deterioration in heated oil and fat |
| JPS5782763A (en) * | 1980-11-12 | 1982-05-24 | New Japan Chem Co Ltd | Method for simple decision of total acid value of electric insulating oil, lubricating oils |
| JPH04127058A (en) * | 1990-09-19 | 1992-04-28 | Nippon Steel Corp | Automatic analysis method and device for acid value and saponification value of oil |
| JPH09100712A (en) * | 1995-10-04 | 1997-04-15 | Fujikura Ltd | Method for predicting lubricating oil life and lubricating oil life predicting device using this method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735682A (en) * | 2012-06-12 | 2012-10-17 | 广东电网公司电力科学研究院 | Accurate and simple transformer oil acid value detection method |
| CN113533628A (en) * | 2021-07-19 | 2021-10-22 | 西安热工研究院有限公司 | Method for detecting acid value of synthetic lubricating oil |
| CN113533628B (en) * | 2021-07-19 | 2023-09-29 | 西安热工研究院有限公司 | Method for detecting acid value of synthetic lubricating oil |
| CN113945679A (en) * | 2021-10-22 | 2022-01-18 | 西安热工研究院有限公司 | A kind of automatic detection method of acid value of synthetic lubricating oil |
| CN113945679B (en) * | 2021-10-22 | 2023-09-29 | 西安热工研究院有限公司 | Automatic detection method for acid value of synthetic lubricating oil |
| CN114414558A (en) * | 2021-12-20 | 2022-04-29 | 山东东岳未来氢能材料股份有限公司 | Method for measuring acid value content of aqueous fluorocarbon resin |
| CN114414558B (en) * | 2021-12-20 | 2024-04-12 | 山东东岳未来氢能材料股份有限公司 | Method for measuring acid value content of water-based fluorocarbon resin |
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