Gulab H.,Bacha Khan University Chrasadda |
Jan F.A.,Bacha Khan University Chrasadda |
Hussain K.,Bacha Khan University Chrasadda |
Tahir Khan M.,Attock Oil Refinery Ltd ARL |
Hussain S.H.,Bacha Khan University Chrasadda
Petroleum and Coal | Year: 2015
The best quality oil is characterized by the lowest Basis Sediment, Water contents (BS and W) and low API gravity values. The present article highlights the problems of crude oil emulsions and identification of the most effective combination of treatment methods to give the best quality oil through the compa-rative analysis of various brands of demulsifiers. About 70 different brands of commercially available demulsifiers were used for the cleaning of slope oil emulsions. Bottle test was used in the current study for the screening of demulsifiers. A combination of factors such as residence time, chemical requirement, heat effect etc. were used to determine the best treatment condition. Based on the result obtained in a single demulsifiers screening process, the demulsifiers from both groups (water soluble and oil soluble) were combined together as composite which resulted in formulation which was very efficient in treating aspaltenes emulsions. The experimental data of the comparative analysis indicated that demulsifiers of brand names 44479 and 669 were the best chemicals for separate treatment of both light and heavy crude emulsions as compared to the other demulsifiers. These demulsifier also caused the sepa-ration of 4.02 Ptb and 3.99Ptb of salts from emulsions respectively. A composite mixture of different demulsifiers also proved to be effective but best results were found in case of mixing of 44479 ,669 and 5217 demulsifiers. In combination test when both types of oil (from C-Sump and D-Separator) were mixed at 60:40 ratios the demulsifier D 6193 caused 22% water drop from at 500 ppm injection rate and was suggested to be the most perfect treating chemical for such emulsions.