翻訳と辞書
Words near each other
・ Total Guitar
・ Total Gym
・ Total 3
・ Total 4
・ Total 5
・ Total 6
・ Total 7
・ Total 8
・ Total 9
・ Total 911
・ Total absolute curvature
・ Total absorption costing
・ Total absorption spectroscopy
・ Total Access Communication System
・ Total Access Recording
Total acid number
・ Total active reflection coefficient
・ Total addressable market
・ Total Advance
・ Total air temperature
・ Total Airport Management Systems
・ Total analysis system
・ Total Anarchoi
・ Total Anarchy
・ Total angular momentum quantum number
・ Total Annihilation
・ Total Annihilation (album)
・ Total anterior circulation infarct
・ Total average
・ Total Axxess


Dictionary Lists
翻訳と辞書 辞書検索 [ 開発暫定版 ]
スポンサード リンク

Total acid number : ウィキペディア英語版
Total acid number
The total acid number (TAN) is a measurement of acidity that is determined by the amount of potassium hydroxide in milligrams that is needed to neutralize the acids in one gram of oil.〔(【引用サイトリンク】 title=Lab Services > TAN test )〕 It is an important quality measurement of crude oil.
The TAN value indicates to the crude oil refinery the potential of corrosion problems. It is usually the naphthenic acids in the crude oil that cause corrosion problems. This type of corrosion is referred to as naphthenic acid corrosion (NAC).
TAN values may also be useful in other industries where oils are used as lubricants to determine oxidation and the subsequent corrosion risk to machinery.〔
TAN value can be deduced by various methods, including
* Potentiometric titration: The sample is normally dissolved in toluene and propanol with a little water and titrated with alcoholic potassium hydroxide (if sample is acidic). A glass electrode and reference electrode is immersed in the sample and connected to a voltmeter/potentiometer. The meter reading (in millivolts) is plotted against the volume of titrant. The end point is taken at the distinct inflection of the resulting titration curve corresponding to the basic buffer solution.
* Color indicating titration: An appropriate pH color indicator e.g. phenolphthalein, is used. Titrant is added to the sample by means of a burette. The volume of titrant used to cause a permanent color change in the sample is recorded and used to calculate the TAN value.
* Spectroscopic methods: as with many chemical parameters, spectroscopy can be used to make fast, accurate measurements once calibrated by a reference method. Mid and near infrared spectroscopy are most commonly used for this purpose.〔(【引用サイトリンク】 title=Petroleum Characteristics and Analysis )〕 Spectroscopic methods are valuable as they can also be used to simultaneously measure a number of other parameters〔 p. 404〕 and do away with the need for wet chemistry.
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Total acid number」の詳細全文を読む



スポンサード リンク
翻訳と辞書 : 翻訳のためのインターネットリソース

Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.