1、Designation: D5983 06 (Reapproved 2011)Standard Specification forMethyl Tertiary-Butyl Ether (MTBE) for DownstreamBlending for Use in Automotive Spark-Ignition Engine Fuel1This standard is issued under the fixed designation D5983; the number immediately following the designation indicates the year o
2、foriginal 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 specification covers requirements for fuel grademethy
3、l tertiary-butyl ether utilized in commerce, terminalblending, or downstream blending with fuels for spark-ignitionengines. Other MTBE grades may be available for blendingthat are not covered by this specification.1.2 The values stated in SI units are to be regarded asstandard. No other units of mea
4、surement are included in thisstandard.2. Referenced Documents2.1 ASTM Standards:2D130 Test Method for Corrosiveness to Copper from Pe-troleum Products by Copper Strip TestD156 Test Method for Saybolt Color of Petroleum Products(Saybolt Chromometer Method)D381 Test Method for Gum Content in Fuels by
5、Jet Evapo-rationD1298 Test Method for Density, Relative Density (SpecificGravity), or API Gravity of Crude Petroleum and LiquidPetroleum Products by Hydrometer MethodD4045 Test Method for Sulfur in Petroleum Products byHydrogenolysis and Rateometric ColorimetryD4052 Test Method for Density, Relative
6、 Density, and APIGravity of Liquids by Digital Density MeterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4176 Test Method for Free Water and Particulate Con-tamination in Distillate Fuels (Visual Inspection Proce-dures)D4177 Practice for Automatic Sampling of Petroleum andPe
7、troleum ProductsD4306 Practice for Aviation Fuel Sample Containers forTests Affected by Trace ContaminationD4814 Specification for Automotive Spark-Ignition EngineFuelD4953 Test Method for Vapor Pressure of Gasoline andGasoline-Oxygenate Blends (Dry Method)D5441 Test Method forAnalysis of Methyl Ter
8、t-Butyl Ether(MTBE) by Gas ChromatographyD5854 Practice for Mixing and Handling of Liquid Samplesof Petroleum and Petroleum ProductsE203 Test Method for Water Using Volumetric Karl FischerTitrationE300 Practice for Sampling Industrial ChemicalsE1064 Test Method for Water in Organic Liquids by Cou-lo
9、metric Karl Fischer Titration3. Terminology3.1 Definitions:3.1.1 methanol, nthe chemical compound CH3OH.3.1.2 methyl tertiary-butyl ether (MTBE), nthe chemicalcompound (CH3)3COCH3C5H12O.3.1.3 oxygenate, nan oxygen-containing ashless, organiccompound, such as an alcohol or ether, which may be used as
10、a fuel or fuel supplement.4. Performance Requirements4.1 Methyl tertiary-butyl ether utilized in commerce, termi-nal blending, or downstream blending with fuels for groundvehicles equipped with spark-ignition engines shall conform tothe requirements of Table 1.NOTE 1Individual applications may requi
11、re a more restrictive sulfurlimit. These requirements are to be negotiated between buyer and seller.5. Workmanship5.1 The MTBE shall be visually free of undissolved water,sediment, and suspended matter. It shall be clear and bright atthe ambient temperature or 21C, whichever is higher.5.2 The specif
12、ication defines only a basic purity for thisproduct. The product shall be free of any adulterant orcontaminant that may render the material unacceptable for itscommonly used applications.1This specification is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is th
13、e direct responsibility of SubcommitteeD02.A0.02 on Oxygenated Fuels and Components.Current edition approved April 1, 2011. Published April 2011. Originallyapproved in 1996. Last previous edition approved in 2006 as D598306. DOI:10.1520/D5983-06R11.2For referenced ASTM standards, visit the ASTM webs
14、ite, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards 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 Stat
15、es.6. Sampling, Containers, and Sample Handling6.1 The user is strongly advised to review all intended testmethods prior to sampling in order to understand the impor-tance and effects of sampling technique, proper containers, andspecial handling required for each test method.6.2 Correct sampling pro
16、cedures are critical to obtain asample representative of the lot intended to be tested. Useappropriate procedures in Practice D4057 or Practice E300 formanual method sampling and in Practice D4177 for automaticmethod sampling as applicable.6.3 The correct sample volume and appropriate containerselec
17、tion are important decisions that can impact test results.Refer to Practice D4306 for aviation fuel container selectionfor tests sensitive to trace contamination. Refer to PracticeD5854 for procedures on container selection and samplemixing and handling. Where practical, MTBE should besampled in gla
18、ss containers. If samples must be collected inmetal containers, do not use soldered metal containers. This isbecause the soldering flux in the containers and the lead in thesolder can contaminate the samples. Plastic containers shouldbe avoided.6.4 Sample SizeA minimum of about 2 L is recom-mended.6
19、.5 Lot SizeA lot shall normally consist of the amountcontained in a tanker compartment or other bulk container inwhich it is delivered. If this definition does not apply, thedefinition of a lot must be agreed upon between the supplierand purchaser.7. Test Methods7.1 The scope of some of the test met
20、hods specified belowdo not include MTBE. The precision of those test methods maydiffer from the reported precisions when testing MTBE.7.2 AppearanceTest Method D4176, Procedure 1.7.3 SulfurTest Method D4045 (see Note 2).7.4 Solvent-Washed Gum ContentTest Method D381, air-jet apparatus.7.5 MTBE, mass
21、 %Test Method D5441.7.6 Methanol, mass %Test Method D5441.7.7 API Gravity at 15.6CPractice D1298.7.8 Density at 15CPractice D1298 or Test MethodD4052.7.9 Copper Strip CorrosionTest Method D130,3hat50C.7.10 Water ContentTest Methods E203 or E1064.7.11 Vapor PressureTest Method D4953.7.12 Color, Saybo
22、ltTest Method D156.NOTE 2Test Method D4045 may require dilution of the sample witha sulfur-free diluent.8. Keywords8.1 automotive spark-ignition engine fuel; blending; corro-sion; impurities; methanol; methyl tertiary-butyl ether; oxy-genate; water contentAPPENDIX(Nonmandatory Information)X1. SIGNIF
23、ICANCE OF ASTM SPECIFICATION FOR MTBE FOR DOWNSTREAM BLENDING FOR USE IN AUTOMOTIVESPARK-IGNITION ENGINE FUELX1.1 GeneralX1.1.1 Methyl tertiary-butyl ether may be used as a blend-ing component for automotive spark-ignition engine fuel tomeet the oxygenate content requirements or improve theantiknock
24、 quality, or both, of certain types of fuels. MTBEpurchased under this specification will assist terminal ordownstream blenders in the use of MTBE as a blendingcomponent.X1.1.2 The composition of unleaded fuel is subject to therules, regulations, and Clean Air Act waivers of the U.S.Environmental Pr
25、otection Agency (EPA). The use of oxygen-ates in blends with unleaded gasoline is described underSection 211(f) (1) of the Clean Air Act. The performancerequirements of this specification were established to helpensure that the addition (in appropriate amounts) of MTBE asdescribed in this specificat
26、ion would not be detrimental to theproperties of the fuel blend.X1.2 AppearanceX1.2.1 Methyl tertiary-butyl ether as covered by this speci-fication is a relatively pure material. Suspended materials,sediments, or contaminants in the MTBE which cause a cloudyor colored appearance may adversely affect
27、 the performance ofthe finished fuel blend in automotive spark-ignition engines.Also, a cloudy or colored appearance may indicate excessivewater or contamination by materials not directly measuredunder this specification.X1.3 SulfurX1.3.1 Sulfur and sulfur-containing compounds contributeto engine we
28、ar, deterioration of engine oil, exhaust catalystTABLE 1 Performance RequirementsProperty LimitsAppearance Clear and brightColor, Saybolt, min + 5Sulfur, mg/kg, max 300Solvent-washed gum content, mg/100 mL, max 5.0Copper strip corrosion, max 1MTBE, mass %, min 95.0Methanol, mass% , max 0.5Vapor pres
29、sure, kPa, max 62Water, mass %, max 0.10API gravity at 15.6C or density at 15C, kg/L ReportD5983 06 (2011)2deactivation, and corrosion of exhaust system parts in spark-ignition engine systems. The limit on sulfur is included toensure that the finished blend of fuel is not detrimental to thesesystems
30、.X1.4 Solvent-Washed Gum ContentX1.4.1 The test for solvent-washed gum content measuresthe amount of residue after evaporation of the fuel componentand following a heptane wash. The heptane wash removes theheptane-soluble, nonvolatile material such as additives, carrieroils used with additives, and
31、diesel fuels. Solvent-washed gumconsists of fuel-insoluble gum and fuel-soluble gum. Thefuel-insoluble portion can clog fuel filters. Both can bedeposited on surfaces when the fuel evaporates. The solvent-washed gum content test may also indicate contamination ofthe methyl tertiary-butyl ether durin
32、g shipping and storage.The limit is included to ensure that finished blends of gasolinedo not contain excess solvent-washed gum and handlingcontamination is minimized.X1.4.2 Solvent-washed gum can contribute to deposits onthe surfaces of carburetors, fuel injectors, and intake mani-folds, ports, val
33、ves, and valve guides. The impact of solvent-washed gum on malfunctions of modern engines is not wellestablished, and the current limit has been assumed from thehistoric gasoline limit rather than from any recent correlativework. It depends on where the deposits form, the presence ofother deposit pr
34、ecursors such as airborne debris, blowby andexhaust gas, recirculation gases, and oxidized engine oil, andthe amount of deposits.X1.4.3 Because the precision statements for Test MethodD381 were developed using only data on hydrocarbons, theymay not be applicable to MTBE.X1.5 Copper Strip CorrosionX1
35、.5.1 Fuels must pass the copper strip corrosion test tominimize corrosion in fuel systems due to sulfur compounds inthe fuel. This limit is included to ensure that the methyltertiary-butyl ether does not contribute to copper corrosion.X1.6 Methyl Tertiary-Butyl Ether PurityX1.6.1 The methyl tertiary
36、-butyl ether minimum puritylevel limits the quantities of contaminants. Some organiccompounds other than MTBE may adversely affect the prop-erties of finished fuel blends.X1.7 Methanol ContentX1.7.1 Methanol is one of the reactants in the production ofMTBE and is a potential contaminant. Methanol co
37、ntributes tovapor pressure increase and poorer water tolerance of finishedfuel blends. The U.S. EPA substantially similar rule limits themethanol content of unleaded fuels. Therefore, it is necessaryto limit the methanol content of MTBE.X1.8 Water ContentX1.8.1 Blends of MTBE and hydrocarbon gasolin
38、e have alimited solvency for water. This solvency will vary with thechemical composition, temperature, and MTBE content of thefuel. Excess water (which may be soluble in the MTBE) maynot be soluble in the gasoline-MTBE blend and could result ina hazy fuel that does not meet the clear and bright requ
39、irementof Specification D4814. The water content of MTBE used forblending with hydrocarbon gasoline is limited to reduce therisk of haze formation.X1.9 Vapor PressureX1.9.1 The vapor pressure of a finished fuel blend must behigh enough to ensure ease of engine starting. Excessive vaporpressure, howe
40、ver, may contribute to vapor lock or highevaporative emissions and running losses.X1.9.2 The vapor pressure of MTBE is controlled to pre-vent adversely affecting the vapor pressure of the finishedblend. A vapor pressure in excess of the value specified inSection 4 may indicate contamination by a lig
41、ht hydrocarbon.Therefore, the vapor pressure must be controlled.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any suc
42、h patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invite
43、d either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a
44、fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this
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