ISO 647:2017

INTERNATIONAL ISO
STANDARD 647
Second edition
2017-07
Brown coals and lignites —
Determination of the yields of tar,
water, gas and coke residue by low
temperature distillation
Charbons bruns et lignites — Détermination des rendements en
goudron, en eau, en gaz et en résidu de coke par distillation à basse
température
Reference number
ISO 647:2017(E)
©
ISO 2017

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ISO 647:2017(E)

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ISO 647:2017(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Preparation of test sample . 5
8 Procedure. 5
9 Expression of result . 7
10 Precision . 7
10.1 Repeatability limit . 7
10.2 Reproducibility limit . 8
11 Test report . 8
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ISO 647:2017(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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This document was prepared by Technical Committee ISO/TC 27, Solid minerals fuels, Subcommittee
SC 5, Methods of analysis.
This second edition cancels and replaces the first edition (ISO 647:1974), of which it constitutes a minor
revision. The changes compared to previous edition are as follows: dated references and other minor
items have been changed.
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ISO 647:2017(E)

Introduction
The yield of distillation products by low temperature distillation, especially the yield of tar, forms the
basis for the classification of brown coal and lignite for use in low temperature carbonization.
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INTERNATIONAL STANDARD ISO 647:2017(E)
Brown coals and lignites — Determination of the yields
of tar, water, gas and coke residue by low temperature
distillation
1 Scope
This document specifies a method for the determination of the yields of tar, water, gas and coke residue
obtained from brown coal and lignite by distillation to a final temperature of 520 °C.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 5068-2, Brown coals and lignites — Determination of moisture content — Part 2: Indirect gravimetric
method for moisture in the analysis sample
ISO 1170, Coal and coke — Calculation of analyses to different bases
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
4 Principle
The sample is heated in an aluminium retort to a temperature of 520 °C during a period of 80 min.
The products of decomposition pass into a water-cooled receiver. The tar and water are condensed
while gaseous products pass to atmosphere. The coke residue remaining in the retort is weighed. The
receiver and its contents are also weighed and the mass of the water in it determined by entrainment
with toluene or xylene. The mass of tar is obtained by difference.
The total water in the receiver includes the moisture in the coal as well as that from the decomposition
of the coal. A separate determination of moisture in the coal is made so that the decomposition water
can be calculated.
The percentage of gas (plus errors) is obtained by subtracting from 100 the sum of the percentages of coke
residue, tar and total water. The results are reported on the “as analysed” basis and on the “dry” basis.
5 Reagents
5.1 Graphite paste.
Ground dry and made into suitable paste with water or thick lubricating oil.
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