GB/T 6536-2010 English PDF (GBT6536-2010)

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GB/T 6536-2010: Standard test method for distillation of petroleum products at atmospheric pressure
GB/T 6536-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.080
E 30
Replacing GB/T 6536-1997
Standard test method for distillation of petroleum
products at atmospheric pressure
ISSUED ON: JANUARY 10, 2011
IMPLEMENTED ON: MAY 01, 2011
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 4 
Introduction ... 8 
1 Scope ... 9 
2 Normative references ... 9 
3 Terms and definitions ... 10 
4 Method summary ... 13 
5 Instruments ... 13 
6 Sampling, sample storage and sample handling ... 19 
7 Instrument preparation ... 22 
8 Calibration and standardization ... 23 
9 Test steps ... 25 
10 Calculation ... 31 
11 Report ... 34 
12 Precision and deviation ... 36 
Annex A (normative) Details of instruments ... 42 
Annex B (normative) Determination of the difference in temperature lag time
between electronic temperature measurement system and glass mercury
thermometer... 47 
Annex C (informative) Steps to simulate the influence of the exposed liquid
column of a glass mercury thermometer ... 49 
Annex D (normative) Measurement steps and precision calculation examples
for the evaporation percentage or recovery percentage at the specified
temperature reading ... 51 
Annex E (informative) Determination of the corrected loss data table based on
observed loss and atmospheric pressure ... 55 
Annex F (informative) Calculation examples of report data ... 58 
Annex G (informative) Report format description ... 60 
Annex H (informative) Instructions for determination of repeatability and
reproducibility ... 62 
Annex I (normative) Determination of repeatability of Group 0 samples ... 63 
Standard test method for distillation of petroleum
products at atmospheric pressure
WARNING - This standard does not intend to make recommendations for
all safety issues related to its use. Before applying this Standard, users
are responsible for establishing appropriate safety and protection
measures, and determining the applicability of relevant regulatory
restrictions.
1 Scope
This Standard specifies the method that uses laboratory batch distillation
equipment to quantitatively determine the distillation characteristics of
petroleum products at atmospheric pressure. This Standard includes
measurement methods for manual instruments and automatic instruments.
This Standard is applicable to distillate fuels such as natural gasoline (stabilized
light hydrocarbons), light and middle distillates, automotive spark-ignition
engine fuels, aviation gasoline, jet fuel, diesel and kerosene, as well as naphtha
and white spirit products. This Standard does not apply to products that contain
more residues.
NOTE: The residual volume fraction of samples used to establish the precision of this
method is not more than 2%.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For dated references, the subsequent
amendments (excluding corrigendum) or revisions do not apply to this Standard,
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 514, Specification for Liquid-In-Glass Thermometers for Testing of
Petroleum Products
GB/T 3535, Petroleum products - Determination of pour point (GB/T 3535-
2006, ISO 3016:1994, MOD)
GB/T 4756, Method for manual sampling of petroleum liquids (GB/T 4756-
distillation flask.
NOTE: In use, the final boiling point is generally used instead of the dry point. For some
naphtha with special uses, such as naphtha used in the paint industry, the dry point can be
reported. When the final boiling point determination precision of some samples does not
always meet the specified requirements, the dry point can also be used instead of the final
boiling point.
3.5 dynamic holdup
The materials that appear in the neck of the distillation flask, branch pipes and
condenser tubes during the distillation process.
3.6 emergent stem effect
The deviation of the thermometer reading produced when using the fully
immersed glass mercury thermometer under partial immersion conditions.
NOTE: Under local immersion conditions, part of the mercury column, that is, the exposed
part of the mercury column, is at a lower temperature than the immersed part, which causes
the mercury column to shrink and causes the thermometer to read lower.
3.7 final boiling point; FBP
end point; EP
The highest calibrated thermometer reading obtained during the test.
NOTE: The final boiling point or end point usually occurs after all the liquid at the bottom
of the distillation flask has evaporated, and is often referred to as the maximum
temperature.
3.8 front end loss
It refers to the volatilization loss of the specimen transferred from the receiving
cylinder to the distillation flask, the evaporation loss of the specimen during the
distillation process, and the uncondensed specimen vapor loss in the distillation
flask at the end of the distillation.
3.9 initial boiling point; IBP
The corrected thermometer reading observed when the first drop of condensate
is dripped from the end of the condenser tube.
3.10 percent evaporated
The sum of the percent recovery and the loss percentage.
The temperature obtained by a temperature measurement device or system
and equivalent to the thermometer reading described in 3.19
3.18.1 corrected temperature reading
The temperature of the temperature reading described in 3.18 after being
corrected by atmospheric pressure.
3.19 thermometer reading; thermometer result
Under the test conditions of this method, the saturated vapor temperature at
the neck below the branch pipe of the distillation flask measured with a
prescribed thermometer.
3.19.1 corrected thermometer reading
The temperature after the thermometer reading described in 3.19 is corrected
by atmospheric pressure.
4 Method summary
According to the specimen composition, vapor pressure, expected initial boiling
point and expected final boiling point, classify the specimen into one of the five
specified groups. Put the 100mL of specimen under the conditions specified by
the corresponding group, under the ambient atmospheric pressure and the
design that is about a theoretical fractionation tray. Use the laboratory batch
distillation equipment to distill. According to the requirements of test results,
systematically observe and record temperature readings and condensate
volume, distillation residue and loss volume. The observed temperature
readings need to be corrected for atmospheric pressure. The test result is
expressed as a table or graph of the evaporation percentage or percent
recovery to the corresponding temperature.
5 Instruments
5.1 Basic components of the instrument
5.1.1 The basic components of the distillation instrument are the distillation flask,
the condenser and the connected condensation bath, the metal protective cover
or enclosure for the distillation flask, the heater, the distillation flask holder and
support plate, the temperature measurement device and the receiving cylinder
for collecting the distillate.
5.1.2 The manual distillation...