1、Designation: D5742 95 (Reapproved 2015)D5742 16Standard Test Method forDetermination of Butane Activity of Activated Carbon1This standard is issued under the fixed designation D5742; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、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 determination of the activation level of activated carbon. Butane activity (BA) is
3、 defined herein asthe ratio (in percent) of the mass of butane adsorbed by an activated carbon sample to the mass of the sample, when the carbonis saturated with butane under the conditions listed in this test method.1.2 The values stated in SI units are to be regarded as standard. No other units of
4、 measurement are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulator
5、ylimitations prior to use. For a specific warning statement, see 7.1.2. Referenced Documents2.1 ASTM Standards:2D2652 Terminology Relating to Activated CarbonD2854 Test Method for Apparent Density of Activated CarbonD2867 Test Methods for Moisture in Activated CarbonD3195 Practice for Rotameter Cali
6、brationD3467 Test Method for Carbon Tetrachloride Activity of Activated CarbonE177 Practice for Use of the Terms Precision and Bias in ASTM Test MethodsE300 Practice for Sampling Industrial ChemicalsE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method3. T
7、erminology3.1 Definitions For definitions of terms used in this test method, refer to Terminology D2652.4. Summary of Test Method4.1 An activated carbon bed of known volume and mass is saturated with butane vapor. The mass adsorbed at saturation is notedand reported as mass of butane per unit mass o
8、f carbon.5. Significance and Use5.1 The butane activity as determined by this test method is a measure of the ability of an activated carbon to adsorb butanefrom dry air under specified conditions. It is useful for the quality control and evaluation of granular activated carbons. The butaneactivity
9、is an indication of the micropore volume of the activated carbon sample. This activity number does not necessarily providean absolute or relative measure of the effectiveness of the tested carbon for other adsorbates or at other conditions of operation.5.2 The butane activity test can be used as a n
10、on-ozone depleting substitute for the carbon tetrachloride activity test in TestMethod D3467. Fig. 1 shows an experimental correlation of activity values obtained using the two adsorbates.NOTE 1This test has not been designed for use with powdered activated carbon, but it has been used successfully
11、when the flow rate or time areadjusted or the sample volume is decreased to keep the pressure drop at an acceptable value.1 This test method is under the jurisdiction of ASTM Committee D28 on Activated Carbon and is the direct responsibility of Subcommittee D28.04 on Gas PhaseEvaluation Tests.Curren
12、t edition approved Oct. 1, 2015June 1, 2016. Published October 2015July 2016. Originally approved in 1995. Last previous edition approved in 20102015 asD5742 95 (2010).(2015). DOI: 10.1520/D5742-95R15.10.1520/D5742-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactAST
13、M Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made
14、 to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyr
15、ight ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16. Apparatus6.1 Water Bath, capable of maintaining a temperature of 25 6 0.2C and of sufficient depth so that the entire carbon bed in thesample tube is immersed in the water.6.2 Sample Tube,
16、 with the options shown in Fig. 2.6.3 Flowmeter, capable of delivering butane at 0 to 500 mL/min, calibrated in accordance with Practice D3195.6.4 Balance, capable of weighing to within 60.01 g.6.5 Fill DeviceThe vibration feed device used in Test Method D2854.6.6 Apparatus Assembly, shown in Fig. 3
17、.7. Reagents7.1 n-Butane, C. P. Grade. (WarningButane is a flammable gas with a flash point of 138C and a boiling point of 0.5C.Its specific gravity is 2.046 relative to air. Butane may be narcotic in high concentrations and is considered a simple asphyxiant.If the entire apparatus is not set up in
18、a fume hood, provision must be made to vent the gas coming from the discharge stem ofthe sample tube.)8. Sampling8.1 Refer to Practice E300 for guidance in sampling granular activated carbon.FIG. 1 Butane Versus Carbon Tetrachloride CorrelationD5742 1629. Maintenance of Bath Water9.1 The bath water
19、should be changed periodically in order to prevent mold formation.NOTE 1(1) Ground glass stopper, hollow, medium length, 14/20, fromAce Glass catalog No. 8529, Schwartz drying tube, or similar; (2) 5-mm rod,brace; (3) 17-mm OD 1.2-mm standard wall tubing; (4) coors perforated porcelain disk or extra
20、-coarse fritted disk, or similar; (5) 10-mm OD 1.0-mm standard wall tubing; (6) right-angle stopcock, Ace Glass catalog No. 8197, Size 4, 10-mm OD stem, with Ace Glass catalog No. 8470, SizeB, serrated hose connector, or similar; and (7) dimension corresponding to a volume of 16.7 mL above the retai
21、ner plate.FIG. 2 Butane Activity Sample TubeFIG. 3 Butane Activity ApparatusD5742 16310. Procedure10.1 Dry the sample using the procedure described in Test Methods D2867.10.2 Determine the apparent density in accordance with Test Method D2854 and record.10.3 Accurately weigh the empty, dry sample tu
22、be and stoppers to the nearest 0.01 g and record.10.4 Weigh a representative sample of the carbon equivalent to 16.70 6 0.05 mL based on the apparent density determined in10.2. Transfer the weighed sample into the sample tube using the filling technique described in Test Method D2854 through afunnel
23、 modified to accommodate the adsorption tube.10.5 Weigh the filled sample tube and stoppers to the nearest 0.01 g and record.10.6 Set the water bath control to maintain a temperature of 25 6 0.2C.10.7 Clamp the sample tube in a vertical position in the 25 6 0.2C water bath, and attach the tube to th
24、e output of theflowmeter. If the entire apparatus is not in a hood, attach a length of tubing from the effluent side of the sample tube to an exhaustvent.10.8 Regulate the flow to pass butane through the carbon bed at 250 6 5 mL/min. Continue the flow of butane for at least 900s.10.9 Turn off the bu
25、tane, disconnect the tubing, and stopper the sample tube immediately. Remove the sample tube from thewater bath, dry the sample tube, and inspect the tube visually for any condensed water vapor. Stop the testing and begin the testprocedure again if any condensed water is observed.10.10 Weigh the fil
26、led sample tube and its stoppers to the nearest 0.01 g and record.10.11 Reconnect the sample tube to the apparatus and flow butane for consecutive 600-s time intervals until the mass of thesample is constant to within 60.02 g.11. Calculation11.1 The calculations described in this section are based o
27、n the following determinations made during the course of theprocedure:M = mass of sample tube and stoppers,C = mass of carbon, sample tube, and stoppers, andD = mass of saturated carbon, sample tube, and stoppers.11.2 Calculate the butane activity on mass basis as follows:butane activity,%5D 2 C!310
28、0C 2 M! (1)11.3 Fig. 1 shows an experimental correlation between butane activities measured using this test method and carbontetrachloride activities measured in accordance with Test Method D3467.12. Report12.1 Report the following information in the analysis:12.1.1 Name of activated carbon supplier
29、,12.1.2 Grade designation of the sample,12.1.3 Nominal partialparticle size range,12.1.4 Apparent density of the sample,12.1.5 Butane activity,12.1.6 Name of the agency and technician running the test,12.1.7 Identification number and date of the test,12.1.8 Lot number from which the sample was taken
30、, and12.1.9 Estimated carbon tetrachloride activity (optional).13. Precision and Bias13.1 An interlaboratory study of this test method was conducted in 1990.3 Each of eight laboratories tested three randomlydrawn test specimens from each of three different activated carbons. Carbon A was a wood-base
31、d granular carbon, Carbon B wasa pelleted wood-based carbon, and Carbon C was a granular coal-based carbon. Butane activities were 41.4 %, 40.0 %, and 27.2 %,respectively. Practice E691 and Practice E691 computer software were used to design the study and analyze the data.3 Supporting data have been
32、 filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:D28-1003. Contact ASTM CustomerService at serviceastm.org.D5742 16413.2 95 % Limit on Repeatability (Within Laboratory), %:Activated carbonA B CButane activity, % 1.95 2.34 0.9713.3 95 % Limit on Reproduci
33、bility (Between Laboratories), %:Activated carbonA B CButane activity, % 3.57 3.15 1.05NOTE 2The terms repeatability and reproducibility limit are used as specified in Practice E177.14. Keywords14.1 activated carbonASTM International takes no position respecting the validity of any patent rights ass
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