GB/T 2293-2019The method of quinoline-insolube for pitch products of coal carbonization (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 2293-2008 "Pitch products of coal carbonization - Determination of quinoline-insoluble". Compared with GB/T 2293-2008, main technical changes are as follows: - modified Scope (see Clause 1 of this Edition, Clause 1 of Edition 2008); - modified technical requirements for weighing bottle (see

4.1.2 of this Edition,

4.1.2 of Edition 2008); - added filter device; added suction-filtration of glass sand-core filter crucible as well as use and processing methods (see

4.1.7 of this Edition); - improved technical requirements for reagents - quinoline, toluene (see 4.2.1,

4.2.2 of this Edition, 4.2.1,

4.2.2 of Edition 2008); - added technical requirements for reagents - acetone, diatomaceous earth (see 4.2.3,

4.2.4 of this Edition); - modified requirements for sample weighing (see

6.1 of this Edition,

6.2.1 of Edition 2008); - added provisions on processing of glass rod for stirring use (see

6.3 of this Edition); - added use and processing methods for filtering process filter aid (diatomaceous earth) (see

6.5 of this Edition); - modified washing steps after sample is dissolved; respectively used hot quinoline, toluene, and acetone to wash successively (see 6.7, 6.8,

6.9 of this Edition,

6.2.5 of Edition 2008); - modified dosage volume of washing solution - hot quinoline (see

6.7 of this Edition,

1 Scope

GB/T 2293-2019 is the Chinese national standard on the method of quinoline-insolube for pitch products of coal carbonization, in the field of chemical technology. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 4 June 2019 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 January 2020. Classification: ICS 71.080, CCS G18. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This Standard specifies test principle, instruments and reagents, sampling and preparation of sample, test steps, test result calculation and allowable deviation for coal tar and quinoline-insoluble for pitch products of coal carbonization that uses coal tar to produce. This Standard is applicable to determinations of contents of coal tar and quinoline-insoluble for pitch products of coal carbonization that uses coal tar to produce.

2 Normative references

The following referenced documents are indispensable for the application 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.

GB/T 1999, Sampling of coking oil products

GB/T 2000, Coking solid products - Sampling

GB/T 2291, Method for preparation of coal tar pitch specimens

GB/T 6005, Test sieves - Metal wire cloth perforated metal plate and electroformed sheet - Nominal sizes of openings

GB/T 8170, Rules of rounding off for numerical values & expression and judgement of limiting values

4.2.3 Acetone: analytical reagent.

4.2.4 Diatomite: analytical reagent, fineness is 40 meshes ~ 60 meshes. Place diatomite in G4 glass sand-core filter crucible. Use laboratory water to wash and filter. Place in drying oven. Dry to constant weight (2h~2.5h). Put it in dryer to cool to room temperature for use.

5 Sampling and preparation of sample

5.1 Sample's sampling is in accordance with GB/T 1999 and GB/T 2000.

5.2 Sample preparation is in accordance with GB/T 2291. After drying, use mortar to grind into granules that pass through SSomega500/315µm sieve.

5.3 For soft pitch sample: Melt sample first. Stir well. Ensure melting temperature does not exceed 150°C. Melting time does not exceed 10min.

6 Test steps

6.1 Accurately weigh sample volume of which quinoline-insoluble content in sample meets 75mg~150mg (to the nearest of 0.0002g). Place coal tar and pitch samples in clean and dry 100mL beakers. Place modified pitch sample in centrifugal test tube. Add 25mL of quinoline. Use glass rod to stir well.

6.2 Soak above beaker or centrifugal test tube that contains sample together with hard glass washing bottle that contains quinoline into (75±5)°C constant temperature water bath. Stir sample from time to time. Take it out after 30min for suction-filtration.

6.3 Use hot quinoline to wash clean glass rod that is used to stir. Place washing solution into beaker or centrifugal test tube that contains sample.

6.4 Place centrifugal test tube that contains modified pitch sample in centrifuge. Perform centrifugation at a speed of 4000r/min for 20min. Take it out for suction- filtration.

6.5 Install filter device. Add 2g~3g of dry diatomite into clean filter that is dried to constant weight. Weigh all, to the nearest of 0.0001g.

6.6 Use a small amount of quinoline to wet diatomite in filter specified in 6.5. Slowly pour dissolved sample into filter. Perform suction-filtration at the same time.