1、Designation:D101505(Reapproved 2015)Standard Test Method forFreezing Points of High-Purity Hydrocarbons1This standard is issued under the fixed designation D1015;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisi
2、on.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 procedure for the precisemeasurement of the freezing points of high-purity hydrocar-bons.1.2 The values stat
3、ed in SI units are to be regarded as thestandard.The values in parentheses are for information only.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
4、practices and determine the applica-bility of regulatory limitations prior to use.For specific hazardstatements,see 5.1,6.1 and 6.2.NOTE1For the calculation of the molal purity of essentially purecompounds from measured freezing points and for procedures to be usedfor the sampling and determination
5、of purity of certain specificcompounds,see Test Method D1016.2.Referenced Documents2.1 ASTM Standards:2D1016 Test Method for Purity of Hydrocarbons from Freez-ing PointsD1265 Practice for Sampling Liquefied Petroleum(LP)Gases,Manual MethodD4057 Practice for Manual Sampling of Petroleum andPetroleum
6、Products3.Summary of Test Method3.1 The precise experimental measurement of the freezingpoint is made from interpretation of time-temperature freezingor melting curves.34.Significance and Use4.1 The freezing point measured by this test method,whenused in conjunction with the physical constants for t
7、he hydro-carbons listed in Test Method D1016,allows the determinationof the purity of the material under test.A knowledge of thepurity of these hydrocarbons is often needed to help controltheir manufacture and to determine their suitability for use asreagent chemicals or for conversion to other chem
8、ical inter-mediates or finished products.5.Apparatus5.1 Freezing-Point Apparatus,4,5as shown in Figs.1-3comprising a freezing tube,a metal sheath for the freezingtube,a Dewar flask for the cooling bath,a Dewar flask for thewarming bath,a stirring mechanism,suitable clamps andholders for the parts,an
9、d the absorption tubes.The outer wallsof all Dewar flasks can be covered with adhesive tape tominimize danger from glass in case of breakage.(WarningWhen using liquid nitrogen as a refrigerant,provide a means toprevent condensation of oxygen in the space between thefreezing tube and the metal sheath
10、 and subsequent sealing ofthe space by ice forming on the ceramic(or glass)fiber collar.Provide the metal sheath with suitable openings in the sidesand bottom.Failure to do this may result in breakage of thefreezing tube when the liquefied oxygen evaporates within thesealed space.)5.2 Resistance Bri
11、dge,6Mueller type,reading from0.0001 to 50,in steps of 0.001.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.04.0D on Physical and Chemical Methods.Current edition approved June 1,2
12、015.Published July 2015.Originally approvedin 1949.Last previous edition approved in 2010 as D1015 05(2010).DOI:10.1520/D1015-05R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume informatio
13、n,refer to the standards Document Summary page onthe ASTM website.3For details not given here,see Glasgow,A.R.,Jr.,Rossini,F.D.,and Streiff,A.J.,“Determination of the Purity of Hydrocarbons by Measurement of FreezingPoints,”Journal of Research,JNBAA,National Institute of Standards andTechnology,Vol
14、35,No.6,1945,p.355.4The sole source of supply of the apparatus known to the committee at this timeis Reliance Glass Works,Inc.,Bensenville,IL.5If you are aware of alternative suppliers,please provide this information toASTM International Headquarters.Your comments will receive careful consider-ation
15、 at a meeting of the responsible technical committee,1which you may attend.6Apparatus described in 5.2,5.3,5.4,and 5.5 was manufactured by the Leedsand Northrup Co.,Philadelphia,PA,under the following catalog numbers:resistancebridge,No.8069 B;platinum resistance thermometer,No.8163 B;galvanometer,h
16、ighest precision,No.2284 D;galvanometer,routine precision,No.2430 A;lampand scale,No.2100.The galvanometer,routine precision,No.2430-A,and the lampand scale,No.2100,are still available from Leeds and Northrup.The platinumresistance thermometer,No.8163-B,is no longer available from Leeds andNorthrup,but is available with the same part number from Yellows SpringsInstrument Co.,Yellow Springs,OH.The resistance bridge No.8069-B,and thegalvanometer,highest precision,No.2284-D,are no longer available;
