ASTM D7462-2008 459 Standard Test Method for Oxidation Stability of Biodiesel (B100) and Blends of Biodiesel with Middle Distillate Petroleum Fuel (Accelerated Method)《柴油(b100)和生物柴.pdf
《ASTM D7462-2008 459 Standard Test Method for Oxidation Stability of Biodiesel (B100) and Blends of Biodiesel with Middle Distillate Petroleum Fuel (Accelerated Method)《柴油(b100)和生物柴.pdf》由会员分享,可在线阅读,更多相关《ASTM D7462-2008 459 Standard Test Method for Oxidation Stability of Biodiesel (B100) and Blends of Biodiesel with Middle Distillate Petroleum Fuel (Accelerated Method)《柴油(b100)和生物柴.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 7462 08An American National StandardStandard Test Method forOxidation Stability of Biodiesel (B100) and Blends ofBiodiesel with Middle Distillate Petroleum Fuel (AcceleratedMethod)1This standard is issued under the fixed designation D 7462; the number immediately following the designa
2、tion indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers a measure
3、ment of the oxidationstability of biodiesel (B100) and blends of biodiesel withmiddle distillate petroleum fuels under specified oxidizingconditions at 95C. Specifically, the oxidation stability isassessed by the formation and measurement of insolubledegradation materials.NOTE 1Biodiesel B100, compo
4、sed of alkyl esters, can have goodsolubility for some products of oxidative degradation. Thus some B100samples could undergo significant degradation, but show little or nosediment formation. By contrast, many petroleum diesel fuels haverelatively poor solubility for products of oxidative degradation
5、, so Bxxblends, such as B20, could show higher sediment levels. Refer toAppendix X1 for a suggested paraffinic dilution procedure to evaluateoxidative degradation of B100 for degradation materials that are soluble inB100, but insoluble in iso-octane.1.2 The values stated in SI units are to be regard
6、ed asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine
7、 the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 381 Test Method for Gum Content in Fuels by JetEvaporationD 943 Test Method for Oxidation Characteristics of Inhib-ited Mineral OilsD 1193 Specification for Reagent WaterD 2274 Test Method for Oxi
8、dation Stability of DistillateFuel Oil (Accelerated Method)D 4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD 4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD 4625 Test Method for Middle Distillate Fuel StorageStability at 43C (110F)3. Terminology3.1 Defi
9、nitions:3.1.1 adherent insolubles (formerly adherent gum),nmaterial that is produced in the course of stressing distillatefuel under the conditions of this test and which adheres to theglassware after fuel has been flushed from the system.3.1.2 filterable insolubles, nmaterial that is produced inthe
10、 course of stressing the sample fuel under the conditions ofthis test and can be removed from the fuel by filtration. Thisincludes both material suspended in the fuel and material easilyremoved from the oxidation cell and oxygen delivery tube withhydrocarbon solvent.3.1.3 total insolubles, nsum of t
11、he adherent and filterableinsolubles.3.2 Definitions of Terms Specific to This Standard:3.2.1 zero time, ntime the first of a batch of oxidationcells is placed in the heating bath.3.2.1.1 DiscussionThis is the time taken as the start of the16 h of residence in the heating bath.4. Summary of Test Met
12、hod4.1 A 350-mL volume of filtered sample is aged at 95C for16 h while oxygen is bubbled through the sample at a rate of3 L/h. After aging, the sample is cooled to approximately roomtemperature before filtering to obtain the filterable insolublesquantity. The interior of the oxidation cell is also w
13、ashed withhydrocarbon solvent to remove any filterable insolubles andliquid that can be removed by the solvent. These washings arealso filtered and included as filterable insolubles.4.2 Adherent insolubles are then removed from the oxida-tion cell and associated glassware with trisolvent. The trisol
14、-vent is evaporated to obtain the quantity of adherent insolubles.4.3 The sum of the filterable and adherent insolubles,expressed as milligrams per 100 mL, is reported as totalinsolubles.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the
15、direct responsibility of SubcommitteeD02.14 on Stability and Cleanliness of Liquid Fuels.Current edition approved Nov. 1, 2008. Published December 2008.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMSta
16、ndards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Significance and Use5.1 This test method provides a measurement of the oxida-tion stability
17、 of biodiesel and biodiesel blends.5.2 The test method may not provide a prediction of thequantity of insolubles that will form in field storage over anygiven period of time. The amount of insolubles formed in suchfield storage is subject to the specific storage conditions, whichare too variable for
18、 this test method to predict accurately.5.3 This test method yields results more rapidly than TestMethod D 4625, the 43C bottle test. However, as a result ofthe significantly elevated temperature and the pure oxygenatmosphere, the nature and amount of insolubles may deviateto a greater extent than T
19、est Method D 4625 from those formedin field storage.6. Interferences6.1 Oxidation is a major chemical process causing adherentand filterable insolubles to form. Any substances, such ascopper or chromium, that catalyze oxidation reactions willcause more rapid or greater quantities of insoluble materi
20、al, orboth, to form. Since the apparatus used in this test can also beused in Test Method D 943, where coils of copper and steel areused, it is important that any residues that could contain thesemetals be eliminated from the apparatus by thorough cleaningprior to use. Similarly, to preclude the pre
21、sence of chromiumions, as well as to protect laboratory personnel from potentialharm, chromic acid shall not be used for cleaning glassware inthe practice of this test method.6.2 Ultraviolet light exposure has been found to increase theamount of total insolubles. Therefore, the fuel being testedshal
22、l be shielded from direct exposure to ultraviolet light(sunlight or fluorescent). Conduct all sampling, measuring,filtration, and weighing away from direct sunlight and in asdark an area as would be compatible with other laboratoryoperations. Storage before stress, the stress period and cool-down af
23、ter stressing shall be in the dark.7. Apparatus7.1 Oxidation Cell, of borosilicate glass, as shown in Fig. 1,shall consist of a test tube, condenser, and oxygen deliverytube. This cell is identical to that used in Test Method D 2274.7.2 Heating Bath/Block, shall be capable of maintaining auniform te
24、mperature at 95 6 1C. It shall be large enough tohold the desired number of oxidation cells immersed to a depthof approximately 350 mm. Further, the construction mustpermit shielding the fuel samples in the oxidation cells fromlight while they are undergoing oxidation.37.3 Flow Meters, shall have a
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
5000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD74622008459STANDARDTESTMETHODFOROXIDATIONSTABILITYOFBIODIESELB100ANDBLENDSOFBIODIESELWITHMIDDLEDISTILLATEPETROLEUMFUELACCELERATEDMETHOD

链接地址:http://www.mydoc123.com/p-525545.html