ASTM D4438-1985(2007) Standard Test Method for Particle Size Distribution of Catalytic Material by Electronic Counting《电子计数法对催化材料的粒度分布的试验方法》.pdf
《ASTM D4438-1985(2007) Standard Test Method for Particle Size Distribution of Catalytic Material by Electronic Counting《电子计数法对催化材料的粒度分布的试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D4438-1985(2007) Standard Test Method for Particle Size Distribution of Catalytic Material by Electronic Counting《电子计数法对催化材料的粒度分布的试验方法》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 4438 85 (Reapproved 2007)Standard Test Method forParticle Size Distribution of Catalytic Material by ElectronicCounting1This standard is issued under the fixed designation D 4438; the number immediately following the designation indicates the year oforiginal adoption or, in the case o
2、f revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of particlesize distribution of catalyst and cataly
3、st carrier particles usingan electroconductive sensing method and is one of severalvaluable methods for the measurement of particle size.1.2 The range of particle sizes investigated was 20 to 150m (see IEEE/ASTM SI 10) equivalent spherical diameter.The technique is capable of measuring particles abo
4、ve andbelow this range. The instrument used for this method is anelectric current path of small dimensions that is modulated byindividual particle passage through an aperture, and producesindividual pulses of amplitude proportional to the particlevolume.1.3 This standard does not purport to address
5、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 limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 1193 Specificati
6、on for Reagent WaterE 177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE 691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodIEEE/ASTM SI 10 Standard for Use of the InternationalSystem of Units (SI): The Modern Metric System3. Summary
7、 of Test Method3.1 Acarefully dispersed, dilute suspension of the sample ina beaker filled with an electrolyte is placed in the countingposition on the instrument sample stand. The suspension isforced through a restricting aperture. Each passing particle isrecorded on an electronic counter, and the
8、data are accumulatedaccording to selected particle size intervals for subsequentprocessing.3.2 The instrument response is proportional to liquid dis-placement by the particle volume. Equivalent spherical diam-eter is commonly used to express the particle size.4. Significance and Use4.1 This test met
9、hod can be used to determine particle sizedistributions for material specifications, manufacturing control,and research and development work in the particle size rangeusually encountered in fluidizable cracking catalysts.5. Apparatus35.1 Electronic Particle Counter, with sample stand andstirring mot
10、or.5.2 Aperture Tubes, with varying diameters. The diameterrequired is dependent upon the particle size distribution of thesample. Generally, any given tube will cover a particle sizerange from 2 to 40 % of its aperture diameter.5.3 Ultrasonic Tank, 100 W.5.4 Beaker, 100-mL.5.5 Graduated Glass Pipet
11、, 5-mL.5.6 Wash Bottles.5.7 Membrane Filtering Device with 0.22-m filters.5.8 Round-Bottom Sample Beakers, 250-mL.5.9 Micro-Riffler or Chute Riffler.6. Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherwise indicated, it is intended thatall reagents shall c
12、onform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.4Other grades may beused, provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of
13、the determination.1This test method is under the jurisdiction of ASTM Committee D32 onCatalysts and is the direct responsibility of Subcommittee D32.02 on Physical-Mechanical Properties.Current edition approved April 1, 2007. Published April 2007. Originallyapproved in 1985. Last previous edition ap
14、proved in 2001 as D 443885(2001)e1.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Supporting data have been
15、 filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR: D32-1011.4“Reagent Chemicals, American Chemical Society Specifications,” Am. Chemi-cal Soc., Washington, DC. For suggestions on the testing of reagents not listed bythe American Chemical Society, see “Anal
16、ar Standards for Laboratory U.K.Chemicals,” BDH Ltd., Poole, Dorset, and the “United States Pharmacopeia.”1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 Purity of WaterUnless otherwise indicated, referencesto water shall be unde
17、rstood to mean reagent water conformingto Specification D 1193, Type II.6.3 ElectrolyteDissolve 10.0 g of reagent grade sodiumchloride (NaCl) in 1 L of distilled or deionized water and filtertwice through a 0.22-m filter.NOTE 1Commercially available Electrolyte solution of the sameconcentration can
18、also be used, but should be filtered for apertures smallerthan 100 m.6.4 Wash WaterDistilled or deionized water, twice filteredthrough a 0.22-m filter. Electrolyte may also be used as washwater.6.5 Calibration Spheres5, Near monosized, having a relativestandard deviation from the mean of less than 5
19、 %, or equiva-lent, as certified by the manufacturer.7. Procedure7.1 Follow instrument manufacturers instruction manualfor instrument settings.7.2 Follow the manufacturers instructions for calibratingeach aperture and electrolyte combination that will be used.7.3 Before each analysis, using the wash
20、 bottle and filteredwash water, wash all surfaces coming in contact with thesample.7.4 Place 150 to 200 mL of electrolyte in a round-bottombeaker on the sample stand with the stirring rod turningmoderately fast. Position the stirring blades near the bottom ofthe beaker and increase the stirrer speed
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD443819852007STANDARDTESTMETHODFORPARTICLESIZEDISTRIBUTIONOFCATALYTICMATERIALBYELECTRONICCOUNTING

链接地址:http://www.mydoc123.com/p-517053.html