ASTM D2001-92(2002)

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An American National Standard
Designation:D2001–92(Reapproved 2002)
Standard Test Method for
Depentanization of Gasoline and Naphthas
This standard is issued under the fixed designation D 2001; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope in Test Method D 1319 and Test Method D 2789. Pentane and
lighter hydrocarbons are separated by this test method so that
1.1 This test method covers the removal of pentanes and
the depentanized residue can be analyzed and so the pentane
lighter hydrocarbons from gasolines, naphthas, and similar
and lighter hydrocarbons can be analyzed by other methods, if
petroleum distillates to prepare samples suitable for the deter-
desired.
minationofhydrocarbontypesinaccordancewithTestMethod
4.2 Under the conditions specified in the test method some
D 1319 or Test Method D 2789. In addition, this test method
C and lighter hydrocarbons remain in the bottoms, and some
determines the volume percent of bottoms remaining after
C and heavier hydrocarbons carry over to the overhead.
depentanization. 6
Expressed as volume percent of charge, the amounts are
1.2 The values stated in SI units are to be regarded as the
typically 2 % or less, which is considered adequate for the
standard. The values given in parentheses are provided for
purpose designated under Scope. It should be recognized,
information purposes only.
however, that when expressed as volume percent of overhead
1.3 This standard does not purport to address all of the
or of bottoms the percentages can be higher, making this test
safety concerns, if any, associated with its use. It is the
method unsuitable for any purposes not designated under
responsibility of the user of this standard to establish appro-
Scope.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Apparatus
2. Referenced Documents 5.1 Depentanization Apparatus, as shown in Fig. 1, consist-
ing of the following parts:
2.1 ASTM Standards:
5.1.1 Distillation Column,
D 1250 Guide for Petroleum Measurement Tables
5.1.2 Reflux Condenser Head,
D 1319 Test Method for Hydrocarbon Types in Liquid
2 5.1.3 Light-Ends Trap,
Petroleum Products by Fluorescent Indicator Adsorption
5.1.4 Receiver, graduated, 12.5 mL, and
D 2789 Test Method for Hydrocarbon Types in Low-
2 5.1.5 Thermometer, 10 to 79°C (50 to 175°F).
Olefinic Gasoline by Mass Spectrometry
5.2 Column Packing—Two types are required:
3. Summary of Test Method 5.2.1 Heli-Pak Column Packing, 1.27 by 2.54 by 2.54 mm
(Size B, 0.050 by 0.100 by 0.100 in.).
3.1 A 50-mL sample is distilled into an overhead (C and
5.2.2 Heli-Pak Column Packing, Size C, 4.4 by 4.4 m
lighter) fraction and a bottoms (C and heavier) fraction. The
(0.090 by 0.175 by 0.175 in.), or Cannon Protruded Metal
volume of bottoms is measured and the volume percent, based
Packing, 4.0 by 4.0 mm (0.16 by 0.16 in.).
on the charge, is calculated.
5.3 Distillation Flask, round-bottom, 100 mL, with
4. Significance and Use
⁄40 standard-taper female joint.
5.4 Distillation Flask Heating Mantle, Glas-Col, spherical,
4.1 The presence of pentane and lighter hydrocarbons in
for 100-mL flask.
gasolines, naphthas, and similar petroleum distillates interferes
1 3
This test method is under the jurisdiction of ASTM Committee D02 on Thermometer No. ME510-1 available from Metro Scientific Inc., 11 Willow
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee Park Center, East Farmingdale, NY 11735.
D02.04 on Hydrocarbon Analysis. Available from Reliance Glass Works Inc., Gateway Rd., PO Box 825,
Current edition approved March 15, 1992. Published May 1992. Originally Bensenville, IL 60106.
published as D 2001 – 62 T. Last previous edition D 2001 – 91. Cannon protruded metal packing available from Scientific Development Co.,
Annual Book of ASTM Standards, Vol 05.01. Box 795, State College, PA.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D2001–92 (2002)
FIG. 1 Depentanization Apparatus
5.5 Variable Transformer, for regulating power to heating in a suitable liquid. 1,1,2 Trichloro Ethene is recommended.
mantle. (Warning—Health hazard.)
5.6 Water Cooling Bath—Ifasupplyofchilledwaterforthe
6.5 Circulate water, chilled to a temperature between 4 and
reflux condenser is not available, a satisfactory means for 10°C (40 and 50°F), through the reflux condenser.
supplying chilled water can be provided by circulating tap
water through coiled copper tubing immersed in an ice-water 7. Procedure
bath.
7.1 Lubricate the joint at the bottom of the column with a
hydrocarbon-insoluble grease, such as silicone, starch-
6. Preparation of Apparatus
glycerol, or metallic soap. Place the heating mantle around the
6.1 Fill the fractionating column with packing as follows:
flask. With a 50-mL graduated cylinder, measure 50 mL of the
Placeabout25mm(1in.)oftheHeli-Pakcolumnpacking,s
...