ASTM D936-89

Method of Test for Aromatic Hydrocarbons in Olefin-Free Gasolines by Silica Gel Absorption (Withdrawn 1990)

General Information

• Status: Withdrawn
• Withdrawal Date: 14-Aug-1991
• ICS: 75.160.20 - Liquid fuels
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants

Standards Content (Sample)

ASTM DY36 89 M 0759510 OOLl0309 T 9
24 - I6
An American National Standard
41)) Designation: D 936 - 89 AMERICAN SOCIETY FOR TESTINO AND MATERIALS
1016 ASCO SI., PhMe@hm , PI. 19103
Reprinted hOm lh. Anmiil Boa oi ASTM Standards, COplrQhi ASTM
II rol ïikd in lha cum cmbined krdai. will wir hi lha wnt rdiiim.
Standard Test Method for
Aromatic Hydrocarbons in Olefin-Free Gasolines by Silica Gel
Adsorption’
This standard is issued under the fixed designation D 936; the number imrnediafely foliowing 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 (c) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Deparimeni of Dejiense and repiaces Method 3702 of Federal Test Method
Standard No. 791b. Consult the DoD Index of Specijications and Standardsfor the spec$c year of issue which has been adopted by the
Department of Defense.
1. Scope saturates, saturates plus aromatics, aromatics, aromatics plus
alcohol, and alcohol. The percolate is collected in small frac-
1.1 This test method covers the determination of total
tions and the aromatic content of the sample is calculated
aromatic content of gasolines and other debutanized hydro-
from measured volumes and refractive indices of the frac-
carbon mixtures that distill below 204°C (400°F) and contain
tions. Samples containing less than 4 % aromatics are fortified
less than 1 % of olefinic hydrocarbons.
with a known amount of toluene and those containing more
1.2 The values stated in SI units are to be regarded as the
than 80 % aromatics are diluted with a saturated hydrocarbon
standard. The values in parentheses are for information only.
or hydrocarbon mixture boiling in the gasoline range; correc-
1.3 This standard may involve hazardous materials, oper-
tion is made in the calculation for the toluene or diluent added.
ations, and equipment. This standard does not purport to
address all of the safety problems associated with its use. It is
4. Significance and Use
the responsibility of the user of this standard to establish
appropriate safity and health practices and determine the
4.1 A precise knowledge of the liquid volume percent of
applicability of regulatory limitations prior to use. Specific
the aromatic hydrocarbons of gasolines and petroleum
hazard statements are given in Section 7 and Annex Al.
fractions from which gasolines are blended is of value in
of the gasolines. Such
assessing the performance properties
2. Referenced Documents
knowledge is also of value in measuring the conversion of
paraffins and cycloparaffins to aromatics by catalytic re-
2.1 ASTM Standards:
forming. This test method provides a procedure for making
D941 Test Method for Density and Relative Density
such a precise determination.
(Specific Gravity) of Liquids by Lipkin Bicapillary
Pycnomete?
D 1319 Test Method for Hydrocarbon Types in Liquid 5. Interference
Petroleum Products by Fluorescent Indicator Adsorp-
5.1 Paraffins and cycloparaffins do not interfere, regard-
tion2
less of their concentration. Olefinic hydrocarbons, when
E 11 Specification of Wire-Cloth Sieves for Testing Pur-
present in concentrations greater than one percent, interfere
poses3
in the normal use of this test method. Compounds con-
taining sulfur or nitrogen interfere by being included with
3. Summary of Test Method4
the aromatic hydrocarbons. ’
3.1 The sample is passed downward through a column
packed with fine, activated silica gel and, when all of the
6. Apparatus
sample has been adsorbed on the gel, alcohol is added as an
6J Adsorption Column, as shown in Fig. 1, consisting of
eluent. The alcohol causes desorption of the hydrocarbons, -
an eluent reservoir, a sample reservoir, and wide and narrow
forcing them down the column. In this process of adsorption
sections of a water-jacketed tubing. The column should be
and desorption, the hydrocarbons are separated according to
surrounded with a transparent protective shield when oper-
their adsorption affinities so that the components issue from
ating at pressures in excess of 69 kpa (10 psi).
the bottom of the silica gel column in the following order:
6.2 Receiver, graduated, of 1 1-mL capacity, as shown in
Fig. 2.
* This test method is under the jurisdiction of ASTM Committee D2 on
NOTE 1-Whiie not strictly required, a cathetometer, capable of
Petroleum Products and Lubricants and is the direct responsibility of Subcom-
measuring liquid levels to IO. 1 mm, is desirable for more accurate and
mittee Dû2.04 on Hydrocarbon Analysis.
convenient calibration of the receiver (see Section 9).
Current edition approved Oct. 27, 1989. Published December 1989. Originally
published as D 936 - 47. Last previous edition D 936 - 83.
6.3 Sample Containers, of approximately 5,
...