ASTM D2002-93

Standard Test Method for Isolation of Representative Saturates Fraction from Low-Olefinic Petroluem Naphthas (Withdrawn 1998)

General Information

• Status: Withdrawn
• Withdrawal Date: 09-Apr-1998
• ICS: 75.160.20 - Liquid fuels
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.04.0C - Liquid Chromatography

Standards Content (Sample)

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ASTM D2002 93 O759530 0525353 725 =
AMERICAN SOCIETY FOR TESTING AND hlATERIALS
Designation: D 2002 - 93
1916 Rase St Ph:!adelphia, Pa 19103
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
If not listed in the current combined index, will appear in the next edition.
Standard Practice for
Isolation of Representative Saturates Fraction from
Low-Olefinic Petroleum Naphthas'
This standard is issued under the fixed designation D 2002; 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 (t) indicates an editorial change since the last revision or reapproval.
an eluent reservoir, a sample reservoir, and wide and narrow
1. Scope
sections of a water-jacketed tubing. The column should be
1.1 This practice covers the isolation of a representative
surrounded with a transparent protective shield when oper-
saturates fraction from depentanized hydrocarbon mixtures
ating at pressures in excess of 69 kPa (10 psi). The column
that distill below 221'C (430°F) and that contain less than 1
2 of this practice will give satisfactory
shown in Fig.
volume percent of olefinic hydrocarbons.
performance if the charge does not exceed the capacity limits
1.2 The values stated in SI units are to be regarded as the
described in 7.3 of this test method.
standard. The values given in parentheses are for informa-
5.2 Receiver, graduated, of capacity sufficient to collect
tion only.
the total saturates as one fraction.
1.3 This standard does not purport to address all of the
5.3 Vibrator, for packing of silica gel.
safety problems, is any, associated with its use. It is the
Pipet, or hypodermic syringe for charging samples.
5.4
responsibilily of the user of this standard to establish uppro-
5.5 Ultraviolet Light Source, with radiation predomi-
priate safety and health practices and determine the applicu-
A.
nantly at 3650
biliry of regulatory limitations prior to ilse. Specific precau-
tionary statements are given in Notes 1, 2, and 3.
6. Reagents and Materials
6.1 Alcohol, ethyl or isopropyl. (Warning-See Note 1 .)
2. Referenced Documents
NOTE I: Warning-Flammable liquid.
2.1 ASTAf Standards:
D 1319 Test Method for Hydrocarbon Types in Liquid 6.2 Fluorescent Indicator-Liquid dye mixture or stan-
Petroleum Products by Fluorescent Indicator Adsorp-
dard dyed gel?
tion2 Pressuring Gas, nitrogen or air delivered to the top of
6.3
the column at a regulated pressure.
3. Significance and Use
6.4 Silica Gel, 149 to 74 pm (100 to 200 mesh).4
(Warning-See Note 2.)
3.1 The determination of paraffins and naphthenes by the
refractivity intercept method requires a sample free from
NOTE 2: Warning-Compressed gas.
olefins and aromatics. This practice is applicable for the
7. Procedure
isolation of saturates fractions from samples containing less
than 1 volume % of olefinic hydrocarbons.
7.1 Prepare the apparatus and pack the adsorption
column in accordance with 7.1.1 to 7.1.2 of this test method.
4. Summary of Practice
Fluorescent indicator is required as a visual aid in making
4.1 A measured amount of sample is charged to the top of the cut between the separated saturates and olefin bands.
the giass column packed with fine activated silica gel. The Two forms of indicator are available for this purpo~e.~ If the
adsorbed sample is then progressively desorbed with alcohol. liquid fluorescent dye mixture is preferred, it should be
In this process of adsorption and desorption the hydrocar- added to the sample in a volume ratio of approximately 1 to
bons are separated according to their adsorption affinities. 1000. If the standard dyed gel is preferred, it should be added
The saturated hydrocarbon components are least adsorbed to the adsorption column while it is being packed with silica
and issue from the bottom of the silica gel column first. The gel. Approximately 0.25 mL of dyed gel added so that it is
total percolate collected prior to the elution of the yellow positioned near the top of the 10-mm section has proven
fluorescing olefinic marker is representative of the saturates satisfactory.
in the sample. 7.1.1 Clean column and receiver with chromic-sulfuric
acid, warm water, and acetone (Warning-See Note 3.) or
5. Apparatus
alcohol, and dry them by evacuation. Lightly lubricate the
stopcock at the bottom of the column and the receiver
5.1 Adsorption Column, as shown in Fig. 1 , consisting of
stopcock (but not the spherical joint of the sample reservoir
This practice is under the jurisdiction of ASTM Committee D-2 on Petroleum
Products and Lubricants and is the direct responsibility of Subcommittee W2.04
The standard dyed gel is available from UOP Process Div., Organics Dept., 25
on Hydrocarbon Analysis. E. Algonquin Rd., Des Plaines, IL60017-5017, by request
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