ISO-1388-10-1981.pdf

International Standard 1388/l 0 0 N 4 a!- INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON*MEWlYHAPOAHAR OPTAHK3AUMR fl0 CTAH,lAPTM3AUklM*ORGANlSATlON INTERNATIONALE DE fdORMALISATION ,?, ,; jq:y; : . . ! ; : ,; ; , : *: : Ethanol for industrial use - Methods of test - Part 10 : Estimation of hydrocarbons content - Distillation method Ethanol B usage industriel - M&hodes d essai - Partie IO : Evaluation des hydrocarbures - Mkthode par distillation First edition - 1981-11-01 is. , , ., : . . i.!“j/ i i U DC 661.722 : 543.824 Ref. No. IS0 1388/10-1981 (E) , i Descriptors : industrial products, ethanols, tests, determination of content, hydrocarbons, distillation method. Price based on 5 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 19:46:53 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword IS0 (the International Organization for Standardization) is a worldwide federation 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. International 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. International Standard IS0 1388/10 was developed by Technical Committee ISO/TC 47, Chemistry, and was circulated to the member bodies in February 1980. It has been approved by the member bodies of the following countries : Australia France Austria Germany, F.R. Belgium Hungary Brazil India Bulgaria Italy China Korea, Rep. of Czechoslovakia Netherlands Philippines Poland Romania South Africa, Rep. of Switzerland Thailand USSR The member body of the following country expressed disapproval of the document on technical grounds : United Kingdom International Standards IS0 1388/l to IS0 1388/12 cancel and replace IS0 Recom- mendation R 1388-1970, of which they constitute a technical revision. 0 International Organization for Standardization, 1981 0 Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 19:46:53 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 X388/10-1981 (E) Ethanol for industrial use - Methods of test - Part 10 : Estimation of hydrocarbons content - Distillation method 1 Scope and field of application 4.4 Receiver for the estimation of hydrocarbons content, such as that shown in figure 2. This part of IS0 1388 specifies a distillation method for estimating the hydrocarbons content of ethanol for industrial use. 5 Procedure This document should be read in conjunction with IS0 1388/l (see the annex). 5.1 Test portion Take 1 500 f 1 ml of the laboratory sample. 2 Principle 5.2 Determination Distillation of a test portion in the presence of water, addition to the distillate of a saturated sodium chloride solution and measurement of the volume of insoluble hydrocarbons. 3 Reagent During the analysis, use only reagent of recognized analytical grade, and distilled water or water of equivalent purity. 3.1 Sodium chloride, saturated solution at ambient temperature. 4 Apparatus Place the test portion (5.1) in the distillation flask (4. I) and add 1 500 ml of water. Connect the fractionating column (4.2) to the flask and connect the side arm to the Liebig condenser (4.3) fitted with its adaptor. Heat the flask so that the rate of distilla- tion does not exceed 30 drops per minute and collect the distillate in the receiver (4.4). When the distillate reaches the mark on the constricted part of the receiver (about 13 ml of distillate), stop the distillation. Add sufficient of the sodium chloride solution (3.1) to the receiver so that the liquid level lies between the 1 and 2 ml graduations. Mix the contents of the receiver by rotating it, taking care not to turn it upside down. Allow to stand until the liquid has separated into layers. If necessary, again rotate the receiver so as detach any drops of the hydrocarbon phase adhering to the walls of the receiver. Read the volume of the upper layer on the graduated scale of the receiver. Ordinary laboratory apparatus, and 6 Expression of results 4.1 Distillation flask, round-bottomed, of capacity 4 000 ml. 4.2 Hempel fractionating column, height of filling 230 mm, such as that shown in figure 1, filled with glass beads of diameter between 10 and 12 mm. 4.3 Liebig condenser, nominal jacket length 400 mm, fitted with a ground glass adaptor. Using the graph in figure 3, obtain the hydrocarbons content, expressed as a percentage by volume, corresponding to the volume of liquid in the upper layer (5.2). NOTE - Figure 3 is an empirical graph which reflects the fact that the entire hydrocarbons content of the sample does not distil out within the first 13 ml of distillate. The graph is non-linear because the distilla- tion rate of hydrocarbons from the sample is not proportional to the hydrocarbons content. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 19:46:53 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1388/10-1981 (E) Dimensions in millimetres Figure 1 - Hempel fractionating column (4.2) 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 19:46:53 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1388/10-1981 (E) I I 3 ml - - 2 - - 1 - Dimensions in millimetres 4 Q 25 c 53 ml 13 ml Figure 2 - Receiver for the estimation of hydrocarbons content (4.4) 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 19:46:53 MDTNo reproduction or networking permitted without license from IHS -,-,- P W I c) a D 3 z i! d 3 iti : 0 Hydrocarbon content. % ( VI VI 0 -0 i3 .!O -0 .- 0 0 r 3 * 0 s - : s T 5 .- 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 19:46:53 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1388/10-1981 (El Annex IS0 Publications relating to ethanol for industrial use IS0 1388/l - General. IS0 1388/2 - Detection of alkalinity or determination of acidity to phenolphthalein. IS0 1388/3 - Estimation of content of carbonyl compounds present in small amounts - Photometric method. IS0 1388/4 - Estimation of content of carbonyl compounds present in moderate amounts - Titrimetric method. IS0 1388/5 - Determination of aldehydes content - Visual calorimetric method. IS0 1388/6 - Test for miscibility with water. IS0 1388/7 - Determination of methanol content methanol contents between 0,Ol and 0,20 % (V/v) - Photometric method. IS0 1388/8 - Determination of methanol content methanol contents between 0,lO and I,50 % (V/VII - Visual calorimetric method. IS0 1388/g - Determination of esters content - Titrimetric method after saponification. IS0 1388/10 - Estimation of hydrocarbons content - Distillation method. IS0 1388/11 - Test for detection of furfural. IS0 1388/12 - Determination of permanganate time. 5 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 19:46:53 MDTNo reproduction or networking permitted without license from IHS -,-,-