ISO INTERNATIONAL STANDARD 6845 Second edition 1989-07-15 ANsr Interrat Doc Sec Surface active agents - Technical alkane sulfonates --- Determination of the mean relative molecular mass of the alkane monosulfonates and the alkane monosulfonate content Agents de surface - Alcanesulfonates techniques - Determination de la masse moleculaire relative moyenne des alcanemonosulfonates et de leur teneur Reference number ISO 6845 : 1989 (E) No reproduction or networking permitted without license from IHS Not for Resale ISO 6845 : 1989 (E) Foreword national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through Iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with iso, also take part in the work. Iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the Iso Council. They are approved in accordance with IsO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 6845 was prepared by Technical Committee iSO/TC 91, Surfaceactiveagents This second edition cancels and replaces the first edition (IS0 6845 : 1982), of which it constitutes a minor revision. ? ISO 1989 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfim, without permission in writing from the publisher. International Organization for Standardization Case postale 56. CH-1211 Geneve 20 Switzerland Printed in Switzerland Copyright International Organizatin for Standardization No reproduction or networking permitted without license from IHS Not for Resale INTERNATIONALSTANDARD ISO 6845 :1989 (E) Surface active agents - Technical alkane sulfonates Determination of the mean relative molecular mass of the alkane monosulfonates and the alkane monosulfonate content Scope Extraction with light petroleum in a liquid-liquid extractor, giving quantitative separation of the alkane monosulfonic acids This International Standard specifies a method for the deter- into the light petroleum phase and of the alkane disuifonates mination of the mean relative molecular mass of the alkane and sulfate ions into the aqueous/ethanolic phase. monosulfonates present in technical alkane sulfonates which do not contain significant quantities of paraffins,as well as a Evaporation of the light petroleum phase and addition of method for the determination of the alkane monosulfonate ethanol. content. Removal of traces of alkali by means of a cation-exchange The method is applicable to all alkali metal salts of the products column. of sulfochlorinationand sulfoxidationof paraffins. Neutralization of the eluate with carbonate-free sodium hydrox- ide solution. Drying and weighing of the sodium alkane 2 Normative references monosulfonates so formed. Calculation of the mean relative molecular mass of the alkanemonosulfonates and the The following standards contain provisions which, through alkanemonosulfonatecontent. reference inthis text,constituteprovisions of this International Standard.At the time of publication,the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encour- 5 Reagents aged to investigate the possibility of applying the most recent editions of the standards listed below.Members of IEC and ISO During the analysis, use only reagents of recognized analytical maintain registers of currently valid International Standards. grade, and only distilled water or wat