BS ISO 647:2017 pdf download – Brown coals and Ii gnites 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 residueobtained from brown coal and lignite by distillation to a final temperature of 520 °℃. 2Normative references The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies. Forundated 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 gravimetricmethod for moisture in the analysis sample ISO 1170, Coal and coke -Calculation of analyses to different bases 3Terms and definitions No terms and definitions are listed in this document. ISO and lEC maintain terminological databases for use in standardization at the following addresses: —IEC Electropedia: available at http://www.electropedia.orgl -ISO online browsing platform: available at http://www.iso.org/obp 4Principle 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 condensedwhile gaseous products pass to atmosphere. The coke residue remaining in the retort is weighed.Thereceiver and its contents are also weighed and the mass of the water in it determined by entrainmentwith 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 decompositionof the coal. A separate determination of moisture in the coal is made so that the decomposition watercan be calculated. The percentage of gas (plus errors) is obtained by subtracting from 100 the sum of the percentages of cokeresidue, tar and total water.The results are reported on the “as analysed”” basis and on the “dry” basis. 5Reagents 5.1Graphite paste. Ground dry and made into suitable paste with water or thick lubricating oil. 5.2 Xylene. Boiling point 135 °C to 140°C. 5.3 Toluene. Boiling point 110 °C. 6Apparatus6.1 Retort. Made of aluminium, with the dimensions shown in Figure 1. With the cover fitted,its capacity with theoutlet tube shall be 170 ml ± 10 ml.The outlet tube shall be made of brass and its internal wall shall beclean and polished.A...

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