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Chemical - METTLER TOLEDO

Chemical - METTLER TOLEDO

Chemical - METTLER

ChemicalPerspectives in Liquid Process Analytics11NewsINGOLDLeading Process AnalyticsAutomated pH Cleaning SystemBoosts Lifetime and Minimizes MaintenanceIn a paraffin wax refining process, measurement of pH and ORP valueswas optimized in association with an electrode cleaning and calibrationsystem. This process improved electrode life to six months and minimizedmaintenance effort.Sasol Wax GmbHThe corporate headquarters and mainfacilities of Sasol Wax GmbH are locatedin the Hamburg port area. Current productionof paraffin and paraffin-relatedproducts amounts to approx. 350,000tons/a. Apart from standard products thecompany also provides customized solutions.Hydrogenation of macroand microcrystalline paraffinsMacro and microcrystalline paraffin waxesdisplay outstanding features for a widevariety of applications, ranging frommass-produced items through to specialtiesfor innovative solutions, e.g. heatstorage media. Derived from fossil rawmaterial, paraffins are mainly made upof saturated hydrocarbons. Potentiallyharm ful constituents such as hydrogensulfide or aromatics are removed usinge.g. high-pressure hydrogenation, renderingthem completely toxicologically safe.Why ORP and pH measurement?The poisonous hydrogen sulfide removedduring the above-mentioned hydroge nationis converted to elementary sulfur inan absorber column via an oxidationstage. Full equation for this conversion is:H2S + ½ O2 ➝ S + H2O.To ensure consistent oxidation of sulfide(S 2- ), the redox potential values beforeand after the oxidizer are important controlcriteria for optimal removal of hydrogensulfide (H2S) in the column. Optimalprocess function is achieved with redoxpotential values of approx. -300 mV at theentry to the oxidizer and approx. -100 mV

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Chemicals - Mettler Toledo
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Fine Chemicals - METTLER TOLEDO