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《Petroleum Geology & Oilfield Development in Daqing》 2004-03
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Two- phase titration using mixed indicator of methylene blue and methyl orange to determine the active matter among PS

LI Bai- lin,et al. (Daqing Petroleum Institute,Daqing 163318,China)  
This paper introduces the two- phase titration method,which uses hyamine 1622 as the titrant,the mixture of methylene blue and methyl orange as the indicator,to determine the active matter among PS (petroleum sulfonate) employed to enhance oil recovery.By studying the factors affecting titration results,we optimize the titration condition and prepared the mixed indicator solution which contains 0.1 wt% methylene blue and 0.02 wt% methyl orange (the concentration ratio of two indicators is 5:1). The investigation shows that,with the addition of 4-8 drops of the mixed indicator,when the end- point is obtained,the pink color of the aqueous phase becomes blue and the blue color of the chloroformic phase becomes green.The both color change can be observed clearly.The two- phase titration has many advantages such as obvious end- point,low disturbance,easy- to- operate and good repeatability.In addition,its relative standard deviation is less than 1.0%.
【CateGory Index】: TE35746
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