1、Designation: D4746 98 (Reapproved 2013)Standard Test Method forDetermination of Quinoline Insolubles (QI) in Tar and Pitchby Pressure Filtration1This standard is issued under the fixed designation D4746; the number immediately following the designation indicates the year oforiginal adoption or, in t
2、he case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of thequinoline-insoluble matter (QI) in ta
3、r and pitch by pressurefiltration and gives results comparable to those obtained byTest Method D2318.1.2 Since this test method is empirical, strict adherence toall details of the procedure is necessary.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in pare
4、ntheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-pria
5、te safety and health practices and determine the applica-bility of regulatory limitations prior to use. Specific hazards aregiven in Section 7, 6.2, and 6.3.2. Referenced Documents2.1 ASTM Standards:2D70 Test Method for Density of Semi-Solid BituminousMaterials (Pycnometer Method)D95 Test Method for
6、 Water in Petroleum Products andBituminous Materials by DistillationD329 Specification for AcetoneD850 Test Method for Distillation of Industrial AromaticHydrocarbons and Related MaterialsD2318 Test Method for Quinoline-Insoluble (QI) Content ofTar and PitchD4296 Practice for Sampling PitchE1 Specif
7、ication for ASTM Liquid-in-Glass Thermometers3. Summary of Test Method3.1 The sample is digested in hot quinoline and filteredthrough a heated pressure filter. The insoluble material iswashed with hot, fresh quinoline and with cold acetone, dried,and weighed.4. Significance and Use4.1 This test meth
8、od is useful in evaluating and character-izing tar and pitch and as one element in establishing theuniformity of shipments and sources of supply.5. Apparatus5.1 Pressure Filtration VesselThe pressure filtration ves-sel3(see Fig. 1) is a stainless steel (304) jacketed block heatedby steam or cooled w
9、ith water, sealed by a lid, flat gasket, andclamp. The interior of the block is designed to accept a 3A2Berlin porcelain filtration crucible (see 5.4). The crucible issealed within the block by the use of three O-rings, a cruciblesealing collar, and an adjustable plunger.5.1.1 The seal is accomplish
10、ed when the sealing lid isplaced on top of the block and clamped. The adjustable plungerapplies a force to the crucible sealing collar, which in turnpushes downward on the crucible and simultaneously com-presses O-ring gaskets, forming a seal between surfaces of thecrucible and the wall of the block
11、. The filtration of material isaccomplished by nitrogen (10 to 30 psig) introduced throughthe lid of the pressure filter. The filtrate exits from the draintube at the bottom of the block. The filtrate is disposed into aBuchner flask, attached to drain tube by a No. 7 rubber stopper.A vacuum hose is
12、attached to the Buchner flask and placed ina 100-mL beaker containing water to indicate the exit ofnitrogen when the filtration is completed.5.2 Beaker, 50 mL.5.3 Buchner Flask, 500.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direc
13、t responsibility of SubcommitteeD02.05 on Properties of Fuels, Petroleum Coke and Carbon Material.Current edition approved July 15, 2013. Published August 2013. Originallyapproved in 1987. Last previous edition approved in 2008 as D4746 98 (2008).DOI: 10.1520/D4746-98R13.2For referenced ASTM standar
14、ds, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The sole source of supply of the pressure filtration vessel known to thecommittee at thi
15、s time is Koppers Inc., 436 Seventh Ave., Pittsburgh, PA15219-1800. If you are aware of alternative suppliers, please provide this informa-tion to ASTM Headquarters. Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.Copyright AS
16、TM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.4 Filtering Crucible, porcelain, with a medium-porositybottom, top outer diameter 134 in. (45 mm), bottom outerdiameter 1.2 in. (30 mm), height 2 in. (50 mm).5.5 Analytical Balance.5.6 Desiccator.
17、5.7 Thermometer, 0 to 300F (150C).5.8 Drying Oven, maintained at 221F (105C).5.9 Mortar and Pestle.5.10 Two Wash Bottles, 500 mL.5.11 Steam Bath.6. Reagents6.1 QuinolineRefined, meeting the following require-ments:6.1.1 The quinoline shall be distilled from 5 to 95 % withina range of 2F (1C) that sh
18、all include the temperature of459.3F (237.4C) after corrections for barometric pressureand emergent steam have been applied. The distillation shall becarried out in accordance with Method D850 using a total-immersion thermometer with a range from 383 to 581F (195to 305C), graduated in 1F (0.5C) and
19、conforming to therequirements for thermometer 69C as described in Specifica-tion E1.6.1.2 The quinoline shall have a specific gravity at 15.5/15.5C of 1.092 to 1.098, as determined by Test Method D70,or other method of equivalent accuracy.6.1.3 The quinoline shall be clear and light in color and sha
20、llcontain less than 0.5 volume % of water as determined by TestMethod D95. If not, redistill the quinoline in an all-glassapparatus, discarding the first 5 % and collecting the next 90 %.If the quinoline contains suspended matter but is clear, light incolor, and contains less than 0.5 % water, filte
21、r the quinolinethrough a crucible containing5gofcelite filter aid.6.1.4 Store the quinoline in a tightly closed, dark bottle.6.2 1 + 1 Hydrochloric Acid SolutionAdd equal volumeconcentrated hydrochloric acid to distilled water. (WarningCorrosive.)6.3 Acetone, meeting Specification D329.(WarningFlamm
22、able (Health Hazard).)7. Hazards7.1 Fumes of the solvents should be removed by means ofproper hoods from all working areas. The working area shouldbe kept free of sparks and flames. Quinoline fumes should notbe inhaled, and prolonged contact with skin should be avoided.7.2 Observe proper laboratory
23、procedures for handling anddiluting hydrochloric acid.8. Bulk Sampling8.1 Samples from shipments shall be taken in accordancewith Practice D4296 and shall be free of foreign substances.Thoroughly mix the sample immediately before removing arepresentative portion for the determination or for dehydrat
24、ion.9. Dehydration of Sample9.1 Hard PitchIf the solid bulk sample contains freewater, air dry a representative portion in a forced draft oven at122F (50C).9.2 Soft Pitch (Softening Point 140F (60C)If thepresence of water is indicated by surface foam on heating,maintain a representative portion of t
25、he bulk sample at atemperature between 257 and 302F (125 and 150C) in anopen container until the surface is free of foam. Take care notto overheat, and remove the heat source immediately when thefoam subsides.9.3 TarA wet tar sample can either be dehydrated or usedas received as long as conditions s
26、tated in 9.3.1 and 9.3.2 aremet.9.3.1 Dehydrate a representative portion of the bulk sample.9.3.2 As an alternative to dehydration, the water content ofthe tar is determined by Test Method D95 and, if the watercontent is less than 10 weight %, the QI content is corrected toa dry-tar basis (see 13.2)
27、. This alternative method applies onlyto stable emulsions of water in tar, that is, no water separateswhen the tar sample is left undisturbed for 24 h at roomtemperature.10. Preparation of Working Sample10.1 Pitch that is sufficiently hard at room temperature shallbe finely pulverized in a mortar. C
28、rush this sample so that allof it will pass the 250-m (No. 60) sieve. Soft pitches and tarsshall be warmed and well agitated before sampling.FIG. 1 Pressure FilterD4746 98 (2013)210.2 The amount of sample to be taken for the test shall besuch that the final quantity of quinoline insoluble (QI) shall
29、 benot less than 0.1 g. As a guide, the following sample sizes arerecommended:Sample Size, gCrude coke oven tar 5.0Horizontal retort tars 2.5Fiber pitch 5.0Other pitches 2.5Distilled tars 2.5Vertical retort tars 10.0 to 25.010.2.1 When the sample contains 15 % QI or if the softeningpoint is greater
30、than 248F (120C), the amount used fortesting should be reduced, but to not less than 0.5 g.11. Crucible Preparation11.1 If the crucible, after thorough cleaning (see 11.2), hasbeen used for less than six determinations, clean it as follows.Remove the mat, wash the crucible with distilled water, dry,
31、and ignite in a muffle furnace for1hatabout 1472F (800C).Cool the crucible slowly by placing it in a drying oven for 1 hafter removal from the furnace to prevent cracking and place itin a desiccator while still warm.11.2 After the crucible has been used for six determinations,remove any residual ash
32、 from pores in the filtering area byboiling in1+1hydrochloric acid solution. Refer to 6.2. Thenboil the crucible in distilled water, thoroughly back wash withdistilled water, dry, and ignite as in 11.1.12. Procedure12.1 Weigh the recommended amount of sample (usually2.5 g) into a 50-mL beaker and re
33、cord weight (W1).12.2 Add 2.0 mL of refined quinoline per gram of sample tobeaker.12.3 Place thermometer 0 to 300F (150C) (6 in. length)into solution and heat on steam bath to 167 6 10F (75 6 5C)for not less than 15 nor more than 20 min. Closely inspect thethermometer and bottom of the beaker for un
34、dissolved pitchand stir so that all of the pitch is brought into solution.12.4 Place gaskets into the pressure vessel.12.5 Start to heat block with steam (see 5.1 and Fig. 2).12.6 Weigh a 3A2 Berlin crucible and record mass (W2).12.7 Place the preweighed crucible in the pressure vesseland then put c
35、rucible collar on (see 5.1 and Fig. 3).12.8 When the quinoline-pitch solution has completed theheating cycle (see 12.3), pour the solution into the crucible,decanting it alongside the thermometer. Wash down the ther-mometer and beaker with 5 to 10 mL of quinoline and place onthe steam bath.12.9 Plac
36、e the lid of the pressure filter with the adjustableplunger on the pressure vessel. The plunger shall be adjusted sothat there is about18-to14-in. gap between the lid and the flatgasket (see Fig. 1) of block. To close, force down by hand andattach clamp.NOTE 1Sealing of the crucible is a trial-and-e
37、rror process. Excessivepressure could cause the crucible to be pushed past the O-rings duringfiltration or not allow complete sealing of the lid. Insufficient pressure ofthe plunger could cause leaks around the O-rings.12.10 Add 10 psig of nitrogen using the pressure controllerto pressurize the vess
38、el to 10 psig with nitrogen. One may seeslight bubbling from the indicator before the filtrate can be seencoming from the drain. Once the filtrate is flowing, pressurecan be increased to 30 psig gradually. Nitrogen may bubbleslowly (caused by volume displacement in the collecting flask)through the w
39、ater seal and may bubble fast when filtration iscompleted. When filtrate stops coming out of bottom, shut offnitrogen and remove lid.NOTE 2In some cases, nitrogen stops bubbling although there is nodraining of the filtrate. The filtration is actually completed, the quinolineinsolubles have compacted
40、 on the bottom (filter cake) of the crucible anddo not let nitrogen pass through. By increasing the pressure, nitrogen willeventually break through the filter cake.12.11 Continue filtering the sample as described in 12.8 to12.10 until the filtrate is clear. This usually will take aboutthree washings
41、 of the beaker. When the third or last washing ispoured into the crucible, rinse the beaker with the wash bottle,allowing the solution to run into the crucible to remove anycarbon deposits. Filter the rinses.12.12 When the last filtration is complete, shut the steamand nitrogen off. Remove the lid a
42、nd start cooling the blockwith water (it takes approximately 5 min to cool the block andcrucible).12.13 Once cool, fill the crucible to about three quarters ofits volume with acetone. Place lid on and follow 12.10 to filter.Perform this step three times.12.14 When acetone rinses are complete, shut o
43、ff thenitrogen, remove the lid, remove the crucible, and wipe sideswith a paper towel containing acetone to remove any traces ofquinoline. Place crucible in an oven at 221F (105C) for aminimum of 30 min, preferably 1 h. Remove, place in adesiccator, and allow to cool for 30 min.12.15 Weigh the cruci
44、ble containing quinoline insolublesand record the mass (W3).NOTE 3For pitches yielding slow-filtering quinoline insolubles, ahigher pressure may be used of up to 50 but not to exceed 75 psig. Underthese conditions, a stainless steel disk with a18-in. hole is added to thebottom of the block. Under hi
45、gh pressure, the crucible can be forcedthrough O-rings. The stainless steel plate reduces the distance the cruciblewill travel to a minimum and thus avoids breakage and sample loss.13. Calculation13.1 Calculate the quinoline-insoluble (QI) content as fol-lows:QI,%5 W32 W2!/W1# 3100 (1)where:W3= mass
46、 of crucible with QI, g;W2= mass of the crucible, g; andW1= mass of the sample, g.13.2 If the QI was determined on a wet tar sample (see9.3.2), correct the QI value determined in 13.1 to a dry-tar basisas follows:D4746 98 (2013)3FIG. 2 Pressure Filter DimensionsD4746 98 (2013)4QI, mass % dry basis!
47、5QI, mass % wet basis! from 13.1100 2 water content of tar, mass %!3100(2)14. Report14.1 Report the quinoline insoluble (QI) content to thenearest 0.1 %.15. Precision and Bias415.1 RepeatabilityDuplicate values by the same operatorshall not be considered suspect unless they differ by more than0.2 %.
48、4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D08-1002.FIG. 3 Pressure Filter Tension Adjuster, Collar, and CapD4746 98 (2013)515.2 ReproducibilityThe values reported by each of twolaboratories, representing the arithmetic ave
49、rage of duplicatedeterminations, shall not be considered suspect unless theydiffer by more than 0.3 %.16. Keywords16.1 coal-tar insolubles; pitch; pressure filtration; QI;quinoline-insolubles; tarASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility
