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ASTM D94-07(2017)
Standard Test Methods for Saponification Number of Petroleum Products
NORMA vydaná dňa 1.5.2017
Informácie o norme:
Označenie normy: ASTM D94-07(2017)
Dátum vydania normy: 1.5.2017
Kód tovaru: NS-687768
Počet strán: 9
Približná hmotnosť: 27 g (0.06 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D94-07(2017) :
Keywords:
additives, lubricating oils, potentiometric titration, saponification number ,, ICS Number Code 75.080 (Petroleum products in general)
Doplňujúce informácie
| Significance and Use | ||||||||||||||
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5.1 Petroleum products can contain additives that react with alkali to form metal soaps. Fats are examples of such additives. Also, certain used engine oils, especially from turbine or internal combustion engines, can contain chemicals that will similarly react with alkali. The saponification number expresses the amount of base that will react with 1 g of sample when heated in a specific manner. This then gives an estimation of the amount of acid present in the sample, that is, any free acid originally present plus any combined (for example, in esters) that have been converted to metal soaps during the heating procedure. 5.2 Saponification numbers are also used in setting product specifications for lubricants and additives. |
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| 1. Scope | ||||||||||||||
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1.1 These test methods cover the determination of the amount of constituents in petroleum products such as lubricants, additives, and transmission fluids that will saponify under the conditions of the test. Note 1: Statements defining this test and its significance
when applied to electrical insulating oils of mineral origin will
be found in Guide D117.
Experience has shown that for transformer oils, Test Method
D94, modified by use of 0.1
1.1.1 Two test methods are described:
Method A—Color Indicator Titration (Sections 6 – 13), and Method B—Potentiometric
Titration (Sections 14 –
23).
1.2 Because compounds of sulfur, phosphorus, the halogens, and certain other elements that are sometimes added to petroleum products also consume alkali and acids, the results obtained indicate the effect of these extraneous materials in addition to the saponifiable material present. Results on products containing such materials, on used internal-combustion-engine crankcase oils, and on used turbine oils must be interpreted with caution. Note 2: The materials referred to above, which are not
normally considered saponifiable matter, include inorganic or
certain organic acids, most nonalkali soaps, and so forth. The
presence of such materials increases the saponification number
above that of fatty saponifiable materials for which the test
method is primarily intended. The odor of hydrogen sulfide near the
end of the back-titration in the saponification test is an
indication that certain types of reactive sulfur compounds are
present in the sample. In the case of other reactive sulfur,
chlorine, and phosphorus compounds and other interfering materials,
no simple indication is given during the test. A gravimetric
determination of the actual amount of fatty acids is probably the
most reliable method for such compounds. Test Methods D128 or IP Method 284/86 can be used to
determine fatty acids gravimetrically.
1.3 The values stated in SI units are to be regarded as the standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Sections 6, 7, 8, 10, 15, 16, 17, and 19. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||||||||
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