ASTM D2421-2018 Standard Practice for Interconversion of Analysis of C5 and Lighter Hydrocarbons to Gas-Volume Liquid-Volume or Mass Basis.pdf
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1、Designation: D2421 13D2421 18Standard Practice forInterconversion of Analysis of C5 and Lighter Hydrocarbonsto Gas-Volume, Liquid-Volume, or Mass Basis1This standard is issued under the fixed designation D2421; the number immediately following the designation indicates the year oforiginal adoption o
2、r, 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. Scope*1.1 This practice describes the procedure for the interconversion of the analysis
3、 of C5 and lighter hydrocarbon mixtures togas-volume (mole), liquid-volume, or mass basis.1.2 The computation procedures described assume that gas-volume percentages have already been corrected for nonideality ofthe components as a part of the analytical process by which they have been obtained. The
4、se are numerically the same as molepercentages.1.3 The procedure assumes the absence of nonadditivity corrections for mixtures of the pure liquid compounds. This isapproximately true only for mixtures of hydrocarbons of the same number of carbon atoms, and in the absence of diolefins andacetylenic c
5、ompounds.1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.after SI units are provided for information only and are not considered standard.1.5 This standard does not purport to address all of the safety concerns, if any, a
6、ssociated with its use. It is the responsibilityof the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with intern
7、ationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Source of Data2.1 The basic values for the relat
8、ive density 15.6/15.6C15.6 C (60/60F)15.6 C (60 F60 F) of the pure compounds havebeen obtained from TRC (formerly the Thermodynamics Research Center, and now part of NIST), except where otherwise noted.The values for methane, ethylene, and acetylene are not those of pure materials but are assumed to
9、 apply as a component of a liquidmixture.2.2 The conversion factors for 1 mL 1 mL of ideal gas at 15.6C (60F) and 101.325 kPa (760 mm 15.6 C (60 F) and101.325 kPa (760 mm Hg) to millilitres of liquid at 15.6C (60F)15.6 C (60 F) have been calculated as follows:1 This practice is under the jurisdictio
10、n of ASTM Committee D02 on Petroleum Products Products, Liquid Fuels, and Lubricants and is the direct responsibility ofSubcommittee D02.H0 on Liquefied Petroleum Gas.Current edition approved June 15, 2013June 1, 2018. Published August 2013November 2018. Originally approved in 1965. Last previous ed
11、ition approved in 20022013as D2421 02 (2007).D2421 13. DOI: 10.1520/D2421-13.10.1520/D2421-18.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically poss
12、ible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCop
13、yright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1For 1 mL gas at 15.6C (60F), 101.325 kPa (760 mm For 1 mL gas at 15.6 C (60 F), 101.325 kPa (760 mm Hg),L 5273.15/288.71!3M/22414! (1)31/relative density!30.999016!#4.2252310253M/relative d
14、ensity!5millilitres liquid at 15.6C 60F!L 5273.15 K/288.71!3M/22414! (1)31/relative density!30.999016!#4.2252310253M/relative density!5millilitres liquid at 15.6 C60 F!where:L = calculated liquid volume, mL,M = molecular weight, g-mol,22414 = calculated from V=nRT/P,n = 1 g-mole,n = 1 g-mol,R = 8314
15、.472,R = 8314.472 mL kPa K1 g-mol1,T = 273.15, andT = 273.15 K, andP = 101.325 kPa.2.3 Where ideal gas volumes have been measured at temperatures and pressures different from 15.6C (60F) at 101.325 kPa(760 mm 15.6 C (60 F) at 101.325 kPa (760 mm Hg), they shall be corrected to these conditions.3. Si
16、gnificance and Use3.1 For custody transfer and other purposes, it is frequently necessary to convert a component analysis of light hydrocarbonmixture from one basis (either gas volume, liquid volume, or mass) to another.3.2 The component distribution data of light hydrocarbon mixtures can be used to
17、 calculate physical properties such as relativedensity, vapor-pressure, and calorific value. Consistent and accurate conversion data are extremely important when calculatingvapor, liquid, or mass equivalence.4. Procedure4.1 To convert from the original to the desired basis, multiply or divide the pe
18、rcent of each compound in the original basisaccording to the schedule shown in Table 1. Perform the calculation, using the corresponding factor indicated in Table 2. Carryat least one more significant figure in all of the calculations than the number of significant figures in the original analysis.4
19、.1.1 The factors or percentages may be multiplied by any constant number for convenience (such as moving the decimal)without changing the end result.4.2 Add the products or quotients obtained in accordance with 4.1.4.3 Multiply the products or quotients obtained in accordance with 4.1 by 100 divided
20、 by the sum of the products or quotients.Round off the results so that the same number of significant figures is obtained in the final answer as was used in the originalanalysis.TABLE 1 Conversion Factors ScheduledOriginal Basis Desired Basis Operation Factor Column inTable 2Gas volume mass multiply
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