acid number

• 酸価

関

acid value

WordNet

1. give numbers to; "You should number the pages of the thesis"
2. place a limit on the number of (同)keep_down
3. a concept of quantity involving zero and units; "every number has a unique position in the sequence"
4. the property possessed by a sum or total or indefinite quantity of units or individuals; "he had a number of chores to do"; "the number of parameters is small"; "the figure was about a thousand" (同)figure
5. a clothing measurement; "a number 13 shoe"
6. an item of merchandise offered for sale; "she preferred the black nylon number"; "this sweater is an all-wool number"
7. a numeral or string of numerals that is used for identification; "she refused to give them her Social Security number" (同)identification number
8. a select company of people; "I hope to become one of their number before I die"
9. the grammatical category for the forms of nouns and pronouns and verbs that are used depending on the number of entities involved (singular or dual or plural); "in English the subject and the verb must agree in number"
10. enumerate; "We must number the names of the great mathematicians" (同)list
11. street name for lysergic acid diethylamide (同)back breaker, battery-acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane, Zen
12. any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
13. having the characteristics of an acid; "an acid reaction"
14. so frightened as to be unable to move; stunned or paralyzed with terror; petrified; "too numb with fear to move"
15. make numb or insensitive; "The shock numbed her senses" (同)benumb, blunt, dull

PrepTutorEJDIC

1. 〈U〉〈C〉(数えて得られる)『数,数量』 / 〈C〉(概念としての)『数,数字』 / 〈C〉『番号』 / 〈C〉(演奏会や演劇の)番組,出し物;曲目 / 〈C〉(雑誌の)号 / 〈U〉(文法で)数(すう) / 《複数形で》数の上の優勢 / 《複数形で》算数 / 〈C〉《単数形で》《話》(商品としての)洋服の1点;商品,売り物 / 〈C〉《単随形で》《俗》女の子 / …‘を'数える / (…の中に,…として)…‘を'含める,加える《+『among』(『with, as』)+『名』》 / …‘に'番号をつける / …‘の'数となる / 《しばしば受動態で》…‘の'数を制限する / 総計(…に)なる《+『in』+『名』〈数〉》
2. 酸性の / 酸味のある,すっぱい(sour) / (言葉・態度などが)厳しい,しんらつな / 酸 / すっぱいもの / 《俗》=LSD
3. 麻痺(まひ)した,感覚を失った,しびれた / …‘の'感覚を失わせる,‘を'しびれさせる
4. 数学,数学 / (人員などの)数の優勢 / 《米》《the~》=numbers game / 《古》詞句,韻文

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/09/24 08:42:26」(JST)

wiki en

[Wiki en表示]

In chemistry, acid value (or "neutralization number" or "acid number" or "acidity") is the mass of potassium hydroxide (KOH) in milligrams that is required to neutralize one gram of chemical substance. The acid number is a measure of the amount of carboxylic acid groups in a chemical compound, such as a fatty acid, or in a mixture of compounds. In a typical procedure, a known amount of sample dissolved in organic solvent (often isopropanol), is titrated with a solution of potassium hydroxide with known concentration and with phenolphthalein as a color indicator.

The acid number is used to quantify the amount of acid present, for example in a sample of biodiesel. It is the quantity of base, expressed in milligrams of potassium hydroxide, that is required to neutralize the acidic constituents in 1 g of sample.

V_eq is the volume of titrant (ml) consumed by the crude oil sample and 1 ml of spiking solution at the equivalent point, b_eq is the volume of titrant (ml) consumed by 1 ml of spiking solution at the equivalent point, and 56.1 is the molecular weight of KOH. W_Oil is the mass of the sample in grams.

The molar concentration of titrant (N) is calculated as such:

In which W_KHP is the mass (g) of KHP in 50 ml of KHP standard solution, V_eq is the volume of titrant (ml) consumed by 50 ml KHP standard solution at the equivalent point, and 204.23 is the molecular weight of KHP.

There are standard methods for determining the acid number, such as ASTM D 974 and DIN 51558 (for mineral oils, biodiesel), or specifically for Biodiesel using the European Standard EN 14104 and ASTM D664 are both widely utilised worldwide. Acid number (mg KOH/g oil) for biodiesel should to be lower than 0.50 mg KOH/g in both EN 14214 and ASTM D6751 standard fuels. This is since the FFA produced may corrode automotive parts and these limits protect vehicle engines and fuel tanks.

As oil-fats rancidify, triglycerides are converted into fatty acids and glycerol, causing an increase in acid number. A similar observation is observed with biodiesel aging through analogous oxidation processes and when subjected to prolonged high temperatures (ester thermolysis) or through exposure to acids or bases (acid/base ester hydrolysis).

See also

• Saponification value
• Hydroxyl value
• Iodine value
• Total acid number
• Oxidation
• EN 14214

UpToDate Contents

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Related Links

• Acid value - Wikipedia, the free encyclopedia

In chemistry, acid value (or "neutralization number" or "acid number" or "acidity") is the mass of potassium hydroxide (KOH) in milligrams that is required to neutralize one gram of chemical substance. The acid number is a measure of the ...

Related Pictures

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★リンクテーブル★

リンク元	「酸価」「acid value」
関連記事	「numb」「number」「numbering」

「酸価」

　　[★]

英

acid value、acid number

関

油脂

「acid value」

　　[★]

• 酸価

関

acid number

「numb」

　　[★]

• adj.

• かじかんだ、麻痺した、無感覚な、鈍い、しびれた。無関心の

関

anesthesia, cauterize, insensible, insensitive, insensitivity, palsy, paralysis, paralyze, plegia

　 　 　

「number」

　　[★]

• n.

• 数、ナンバー

• v.

• 番号をつける

関

count、numeral

　 　 　 　 　 　 　 　 　 　 　

「numbering」

　　[★]

• n.

• ナンバリング、番号付け