1、Designation: D5742 95 (Reapproved 2010)Standard 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, the year
2、 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 activationlevel of activated carbon. Butane activity (BA) is definedh
3、erein as the ratio (in percent) of the mass of butane adsorbedby an activated carbon sample to the mass of the sample, whenthe carbon is saturated with butane under the conditions listedin this test method.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement
4、 are included in thisstandard.1.3 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-priate safety and health practices and determine the applica-bility of regulatory limitation
5、s prior to use. For a specificwarning statement, see 7.1.2. Referenced Documents2.1 ASTM Standards:2D2652 Terminology Relating to Activated CarbonD2854 Test Method for Apparent Density of ActivatedCarbonD2867 Test Methods for Moisture in Activated CarbonD3195 Practice for Rotameter CalibrationD3467
6、Test Method for Carbon Tetrachloride Activity ofActivated CarbonE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE300 Practice for Sampling Industrial ChemicalsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3. Terminology3.1 De
7、finitionsFor definitions of terms used in this testmethod, refer to Terminology D2652.4. Summary of Test Method4.1 An activated carbon bed of known volume and mass issaturated with butane vapor. The mass adsorbed at saturation isnoted and reported as mass of butane per unit mass of carbon.5. Signifi
8、cance and Use5.1 The butane activity as determined by this test method isa measure of the ability of an activated carbon to adsorb butanefrom dry air under specified conditions. It is useful for thequality control and evaluation of granular activated carbons.The butane activity is an indication of t
9、he micropore volume ofthe activated carbon sample. This activity number does notnecessarily provide an absolute or relative measure of theeffectiveness of the tested carbon for other adsorbates or atother conditions of operation.5.2 The butane activity test can be used as a non-ozonedepleting substi
10、tute for the carbon tetrachloride activity test inTest Method D3467. Fig. 1 shows an experimental correlationof activity values obtained using the two adsorbates.NOTE 1This test has not been designed for use with powderedactivated carbon, but it has been used successfully when the flow rate ortime a
11、re adjusted or the sample volume is decreased to keep the pressuredrop at an acceptable value.6. Apparatus6.1 Water Bath, capable of maintaining a temperature of 256 0.2C and of sufficient depth so that the entire carbon bed inthe sample tube is immersed in the water.6.2 Sample Tube, with the option
12、s shown in Fig. 2.6.3 Flowmeter, capable of delivering butane at 0 to 500mL/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 TestMethod D2854.6.6 Apparatus Assembly, shown in Fig. 3.7. Reagents7.1 n-
13、Butane, C. P. Grade. (WarningButane is a flam-mable gas with a flash point of 138C and a boiling point of0.5C. Its specific gravity is 2.046 relative to air. Butane maybe narcotic in high concentrations and is considered a simpleasphyxiant. If the entire apparatus is not set up in a fume hood,provis
14、ion must be made to vent the gas coming from thedischarge stem of the sample tube.)1This test method is under the jurisdiction of ASTM Committee D28 onActivated Carbon and is the direct responsibility of Subcommittee D28.04 on GasPhase Evaluation Tests.Current edition approved April 1, 2010. Publish
15、ed May 2010. Originallyapproved in 1995. Last previous edition approved in 2005 as D5742 95 (2005).DOI: 10.1520/D5742-95R10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, r
16、efer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8. Sampling8.1 Refer to Practice E300 for guidance in sampling granu-lar activated carbon.9. Maintenance of Bath Water9.1
17、The bath water should be changed periodically in orderto prevent mold formation.10. Procedure10.1 Dry the sample using the procedure described in TestMethods D2867.10.2 Determine the apparent density in accordance withTestMethod D2854 and record.10.3 Accurately weigh the empty, dry sample tube andst
18、oppers to the nearest 0.01 g and record.10.4 Weigh a representative sample of the carbon equivalentto 16.70 6 0.05 mL based on the apparent density determinedin 10.2. Transfer the weighed sample into the sample tubeusing the filling technique described in Test Method D2854through a funnel modified t
19、o accommodate the adsorption tube.10.5 Weigh the filled sample tube and stoppers to thenearest 0.01 g and record.10.6 Set the water bath control to maintain a temperature of25 6 0.2C.10.7 Clamp the sample tube in a vertical position in the 256 0.2C water bath, and attach the tube to the output of th
20、eflowmeter. If the entire apparatus is not in a hood, attach alength of tubing from the effluent side of the sample tube to anexhaust vent.10.8 Regulate the flow to pass butane through the carbonbed at 250 6 5 mL/min. Continue the flow of butane for atleast 900 s.10.9 Turn off the butane, disconnect
21、 the tubing, and stopperthe sample tube immediately. Remove the sample tube fromthe water bath, dry the sample tube, and inspect the tubevisually for any condensed water vapor. Stop the testing andbegin the test procedure again if any condensed water isobserved.10.10 Weigh the filled sample tube and
22、 its stoppers to thenearest 0.01 g and record.FIG. 1 Butane Versus Carbon Tetrachloride CorrelationD5742 95 (2010)2NOTE(1) Ground glass stopper, hollow, medium length, 14/20, from Ace Glass catalog No. 8529, Schwartz drying tube, or similar; (2) 5-mm rod,brace; (3) 17-mm OD 3 1.2-mm standard wall tu
23、bing; (4) coors perforated porcelain disk or extra-coarse fritted disk, or similar; (5) 10-mm OD 31.0-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 c
24、orresponding to a volume of 16.7 mL above the retainer plate.FIG. 2 Butane Activity Sample TubeFIG. 3 Butane Activity ApparatusD5742 95 (2010)310.11 Reconnect the sample tube to the apparatus and flowbutane for consecutive 600-s time intervals until the mass ofthe sample is constant to within 60.02
25、g.11. Calculation11.1 The calculations described in this section are based onthe 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 Calcula
26、te the butane activity on mass basis as follows:butane activity, % 5D 2 C! 3 100C 2 M!(1)11.3 Fig. 1 shows an experimental correlation betweenbutane activities measured using this test method and carbontetrachloride activities measured in accordance with TestMethod D3467.12. Report12.1 Report the fo
27、llowing information in the analysis:12.1.1 Name of activated carbon supplier,12.1.2 Grade designation of the sample,12.1.3 Nominal partial 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 an
28、d date of the test,12.1.8 Lot number from which the sample was taken, and12.1.9 Estimated carbon tetrachloride activity (optional).13. Precision and Bias13.1 An interlaboratory study of this test method wasconducted in 1990.3Each of eight laboratories tested threerandomly drawn test specimens from e
29、ach of three differentactivated carbons. Carbon A was a wood-based granularcarbon, Carbon B was a pelleted wood-based carbon, andCarbon C was a granular coal-based carbon. Butane activitieswere 41.4 %, 40.0 %, and 27.2 %, respectively. Practice E691and Practice E691 computer software were used to de
30、sign thestudy and analyze the data.13.2 95 % Limit on Repeatability (Within Laboratory), %:Activated carbonABCButane activity, % 1.95 2.34 0.9713.3 95 % Limit on Reproducibility (Between Laborato-ries), %:Activated carbonABCButane activity, % 3.57 3.15 1.05NOTE 2The terms repeatability and reproduci
31、bility limit are used asspecified in Practice E177.14. Keywords14.1 activated carbonASTM 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
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34、have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multi
35、ple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).3Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D28-1003.D5742 95 (2010)4
