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1、International Standard ) 756/ 1 0 * 4 d!l!l INTERNATIONAL ORGANIZATION FOR STANDARDIZATIDN*MEXAYHAPOHAR OPAH!43ALW=l flOCTAH/lAPT3AlWl*ORGANiSATlON INTERNATIONALE DE NORMALISATION % / ,:;, , ;, : , : 4. j, ;,; :, ! ;. :I i ” A ; i ” , I , $ ; 1: /, Propan-2-01 for industrial use - Methods of test -
2、Part I : General Propanol-2 A usage industriel - M, j .A i t!* iii UDC 661.725.4 : 543 : 620.1 Ref. No. ISO756/1-1981 (E) if Descriptors : industrial products, propanes, tests, generalities. Price based on 3 pages Foreword IS0 (the International Organization for Standardization) is a worldwide feder
3、ation of national standards institutes (IS0 member bodies). The work of developing Inter- national Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. I
4、nternational organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. In
5、ternational Standard IS0 756/l was developed by Technical Committee ISO/TC 47, Chemistry, and was circulated to the member bodies in October 1980. It has been approved by the member bodies of the following countries : Australia Egypt, Arab Rep. of Austria France Belgium Germany, F. R. Brazil Hungary
6、 Bulgaria India China Ireland Czechoslovakia Italy Korea, Rep. of Netherlands Poland Romania Switzerland United Kingdom USSR The member body of the following country expressed disapproval of the document on technical grounds : South Africa, Rep. of International Standards IS0 756/l, IS0 756/2 and IS
7、0 756/3 cancel and replace IS0 Recommendation R 756-1968 of which they constitute a technical revision. 0 International Organization for Standardization, 1981 0 Printed in Switzerland INTERNATIONAL STANDARD IS0 755/l-1981 (E) Propan-2-01 for industrial use Part 1 : General 1 Scope and field of appli
8、cation This part of IS0 756 gives general instructions relating to methods of test for propan-2-01 (isopropyl alcohol) for in- dustrial use. It also specifies the methods to be used for the determination of density at 20 VI, for the determination of boiling range, for the determination of dry residu
9、e after evaporation on a water bath, for the measurement of colour, for the determination of water content, and for the determination of aldehydes and ketones content. The present list of parts of IS0 756 is given in the annex. 2 References IS0 759, Liquid chemicalproducts for industrial use - Deter
10、- mination of density at 20 T. IS0 759, Volatile organic liquids for industrial use - Deter- mination of dry residue after evaporation on a water bath - General method. IS0 760, Determination of water - Karl Fischer method (General method). IS0 918, Volatile organic liquids for industrial use - Dete
11、r- mination of distillation characteristics - General method. ) IS0 1843/3, Higher alcohols for industrial use - Methods of test - Part 3 : Determination of carbonyl compounds content - Potentiometric method. IS0 2211, Liquid chemical products - Measurement of colour in Hazen units (platinum-cobalt
12、scale). 3 Samplingz) Store the laboratory sample in a clean, dry, air-tight glass bottle Regulate the rate of heating so that the first drop of distillate fitted with a ground glass stopper, or a screw-capped bottle fit- falls from the end of the condenser after 7 to 12 min (see ted with a polyethyl
13、ene cone insert, of such capacity that it is IS0 918, sub-clause 7.2). 1) At present at the stage of draft. (Revision of ISO/R 918.) - Methods of test - almost entirely filled by the sample. If it is necessary to seal the bottle, take care to avoid any risk of contamination of the con- tents. NOTE -
14、 A sample of not less than 750 ml is necessary for performing all the tests specified for the product. 4 Determination of density at 20 OC Use the method specified in IS0 759. 5 Determination of boiling range Use the method specified in IS0 918, subject to the following modifications appropriate to
15、propan-2-01. 5.1 Thermometer, complying with the requirements of IS0 918, sub-clause 5.1.2, and of table 1. Table 1 - Requirements for the thermometer Temperature Graduations range Maximum Maximum error error in an interval of 10 oc -. OC OC OC T 48 to 102 02 02 02 I” 5.2 Temperature correction If t
16、he corrected barometric pressure deviates from 1 013 mbara), apply a correction to the observed temperature by subtracting 0,025 “C for every millibar above, or adding 0,025 OC for every millibar below, 1 013 mbar (see IS0 918, clause 9). 5.3 Distillation 2) The sampling of liquid chemical products
17、for industrial use will form the subject of a future International Standard. 3) 1 bar = lo5 Pa 1 IS0 756/l-1981 (E) 6 Determination of dry residue after evaporation on a water bath Use the method specified in IS0 759. 7 Measurement of colour Use the method specified in IS0 2211. 8 Determination of w
18、ater content Use one of the methods specified in IS0 760. 9 Determination of aldehydes and ketones content Use the method specified in IS0 1643/3, subject to the follow- ing modifications. 9.1 Ethanol, carbonyl-free, prepared as follows. Boil under reflux 506 ml of the ethanol (see IS0 1643/3, sub-
19、clause 3.1) with 5 g of 2,4-dinitrophenylhydrazine and 5 drops of hydrochloric acid solution, Q I,19 g/ml, for 2 to 3 h. Distil off the ethanol slowly using a Widmer distillation column about 300 mm long and about 25 mm in diameter, or any other suitable column. Reject the first 50 ml of distillate
20、and collect the next 400 ml, rejecting the remainder. If the distillate is col- oured, redistil it. 9.2 Determination (see IS0 1643/3, sub-clause 5.3) Use a 406 ml beaker for the titration. Table 2 - Carbonyl compounds content Potassium hydroxide solution concentration c(KOH) = 0,l mol/l c(KOH) = 0,
21、Ol mol/l 1 Method of exoression Calculation formulae milligrams per kilogram lOOM(V, - vo, lOM(Vl - vo, (mg/kg) m m percentage by mass M (VI - V()l A4 ( Vl - vo, % (m/m)1 m x IO* m x 103 In the formulae in table 2 : V. is the volume, in millilitres, of the standard volumetric potassium hydroxide sol
22、ution (see IS0 1643/3, sub-clause 3.3 or 3.4) used for the blank test; k , is the volume, in millilitres, of the standard volumetric potassium hydroxide solution (see IS0 1643/3, sub-clause 3.3 or 3.4) used for the determination; A4 is the molar mass, in grams per mole, of the carbonyl compound in t
23、erms of which the results are to be ex- pressed; m is the mass, in grams, of the test portion. 10 Test report The test report, for each determination, shall contain the following information : a) an identification of the sample; b) the reference of the method used; c) the results and the method of e
24、xpression used; d) any unusual features noted during the determination; 9.3 Expression of results (see IS0 1643/3, clause 6) The carbonyl compounds content is given by the formulae shown in table 2. e) any operation not included in the appropriate part of IS0 756 or in the International Standards to which reference is made, or regarded as optional. 2 IS0 756/l-1981 (E) Annex IS0 publications relating to propan-2-01 for industrial use IS0 756/l - General. IS0 756/2 - Determination of acidity - Titrimetric method. IS0 756/3 - Test for miscibility with water.