Emulsion neutralization of high total acid number (TAN) crude oil
a technology of organic acids and crude oil, applied in water/sewage treatment by neutralization, quary waste water treatment, aqueous alkali solution refining, etc., can solve the problems of corrosive equipment, many petroleum crudes with high organic acid content, and does not disclose the treatment of whole crudes or fractions boiling at 1050+°, so as to reduce the acidity and corrosivity of an acid containing corrosive
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example 1
[0040] 1-5 μm droplet size (Ca(OH)2-slurry-in-crude emulsion was prepared in the lab by mixing 5 gm Ca(OH)2, 20 cc H2O and 140 cc Gryphon crude in a beaker with a 19000 rpm batch single stage rotor / stator blender at room temperature.
[0041] Stoichiometric amount of Ca(OH)2 slurry-in-oil emulsion (29.5 ml) was then blended with (440 ml) Gryphon crude (volumetric ratio of 6.7%) and allowed to sit overnight at room temperature in a 2″ d×10″ h graduated cylinder simulating ambient temperature crude storage tank conditions. A similar experiment was done with Chad crude at 50° C. simulating a heated storage tank at 50° C.
[0042] TAN analysis next morning showed 75% and 76% TAN reduction respectively for two repeated experiments. The calcium analysis of the crude showed 80% TAN neutralization for both, which checks the TAN reduction data.
example 2
[0043] An emulsion of aqueous calcium hydroxide in Gryphon crude was prepared using a high-speed (19000 rpm) shear mixer at room temperature. A mixing time as short as 20 seconds is very effective in preparing small drop size water-in-oil emulsions giving a water droplet size distribution of 1 to 10 microns with occasional droplets up to 25 microns. A measured amount of this emulsion equivalent to 100% TAN neutralization was dispersed in the crude oil (separately Gryphon and Chad) by moderate hand shaking for less than 15 seconds. The mixture was allowed to stand overnight in a tall vessel (H / W˜6) with periodic sampling of the crude mixture. Summarized below is the effective TAN reduction vs. time for both Gryphon and Chad crudes:
(a) Gryphon Crude (TAN = 3.14) at 20° C. (room temperature) using1 to 10μ droplets: 29.5 ml of emulsion added to 440 ml of Gryphon crude(volumetric ratio of 6.7%) to achieve full stoichiometric neutralization.TAN NeutralizedSettling TimeTAN Neutralized(as...
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