1、Designation: D 2421 02 (Reapproved 2007)An American National StandardStandard Practice forInterconversion of Analysis of C5and Lighter Hydrocarbonsto Gas-Volume, Liquid-Volume, or Mass Basis1This standard is issued under the fixed designation D 2421; the number immediately following the designation
2、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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice describes the procedure
3、 for the intercon-version of the analysis of C5and lighter hydrocarbon mixturesto gas-volume (mole), liquid-volume, or mass basis.1.2 The computation procedures described assume thatgas-volume percentages have already been corrected for non-ideality of the components as a part of the analytical proc
4、ess bywhich they have been obtained. These are numerically thesame as mole percentages.1.3 The procedure assumes the absence of nonadditivitycorrections for mixtures of the pure liquid compounds. This isapproximately true only for mixtures of hydrocarbons of thesame number of carbon atoms, and in th
5、e absence of diolefinsand acetylenic compounds.1.4 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibilit
6、y of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Source of Data2.1 The basic values for the relative density 15.6/15.6C(60/60F) of the pure compounds have been obtained from theThermodynami
7、cs Research Center, Texas A liquefied petroleum gases; natural gas liquidsTABLE 1 Conversion Factors ScheduledOriginal Basis Desired Basis OperationFactor Column inTable 2Gas-volume mass multiply by 1Gas-volume liquid-volume multiply by 2Mass gas-volume divide by 1Mass liquid-volume divide by 3Liqui
8、d-volume gas-volume divide by 2Liquid-volume mass multiply by 3TABLE 2 Mass-Volume Data for Liquefied Petroleum Gases and Low Boiling HydrocarbonsColumn 1 Column 2 Column 3Compound Molecular MassLiquid Volume in mL of1 mL of ideal gas at15.6C (60F) and101.3 kPa (760 mm Hg)Relative Density 15.6/15.6C
9、(60/60F) (Vacuum)SourceMethaneA16.043 0.002261 0.3 GPA 2145-00EthaneB30.07 0.003565 0.35639 GPA 2145-00AcetyleneA26.038 0.00263 0.418 estimateEthyleneA28.054 0.005029 0.23569 GPA 214500PropaneB44.097 0.003672 0.50736 GPA 2145-00PropyleneB42.081 0.003402 0.52264 GPA 214500Propadiene (Allene)B40.06 0.
10、00282 0.6 API-88MethylacetyleneB40.06 0.00273 0.621 API-88n-ButaneB58.123 0.004205 0.58407 GPA 2145-00IsobutaneB58.123 0.004362 0.56293 GPA 2145-001-ButeneB56.108 0.003949 0.60035 GPSAtrans-2-ButeneB56.108 0.003879 0.61116 GPSAcis-2-ButeneB56.108 0.003772 0.62858 GPSAIsobutyleneB56.108 0.003941 0.60
11、153 GPSA1,2-ButadieneB54.092 0.003474 0.65798 GPSA1,3-ButadieneB54.092 0.003644 0.62722 GPSAEthylacetyleneB54.09 0.00328 0.696 API-88n-Pentane 72.15 0.00483 0.63111 GPA 2145-00Isopentane 72.15 0.004881 0.62459 GPA 2145-00NeopentaneB72.15 0.00511 0.59665 GPSA1-Pentene 70.134 0.004591 0.64538 GPSAtran
12、s-2-Pentene 70.13 0.004537 0.653 TRCcis-2-Pentene 70.13 0.004482 0.6611 TRC2-Methyl-1-butene 70.13 0.004519 0.6557 TRC3-Methyl-1-butene 70.13 0.004684 0.6325 TRC2-Methyl-2-butene 70.13 0.00447 0.663 TRCCyclopentane 70.134 0.003947 0.75077 GPSAIsoprene 68.119 0.004195 0.68614 GPSA1-trans-3-Pentadiene
13、 68.12 0.004224 0.6815 API1-cis-Pentadiene 68.12 0.004133 0.6964 API1,2-Pentadiene 68.12 0.004125 0.6976 APIAApparent values for dissolved gas at 15.6C (60F).BProperty of liquid phase measured at its saturation pressure at 15.6C (60F).Sources: GPA 2145-00 Revision 2: “Table of Physical Constants for
14、 Hydrocarbons and Other Compounds of Interest to the Natural Gas Industry”, Gas ProcessorsAssociation,GPSA: “Engineering Data Book, 11th Edition”, Gas Processors Suppliers Association,API: “Technical Data Book”, American Petroleum Institute, andTRC: Thermodynamic Research Center, Texas A or through the ASTM website(www.astm.org).D 2421 02 (2007)4
