Isolation of interfacial material from organic matrices
A method for preparing a crude oil solution for analysis, including adding water to a porous adsorbent to obtain a supported water substrate, having a plurality of water monolayers disposed on the porous adsorbent. The method further includes exposing the crude oil solution to the supported water substrate for a period of time; separating the supported water substrate from the crude oil solution; washing the supported water substrate with a water immiscible solvent to remove at least one hydrocarbon; displacing water from the plurality of water monolayers and the at least one interfacially active compound from the porous adsorbent with an alcohol and a co-solvent to obtain a displaced phase. The displaced phase can include the water, the at least one interfacially active compound, the alcohol, and the co-solvent. Finally, the method can include drying the displaced phase to isolate the at least one interfacially active compound.
1. A method for analyzing a crude oil solution for the presence of at least one interfacially active compound in the crude oil solution, the method comprising:
adding water to a porous adsorbent to obtain a supported water substrate, wherein the supported water substrate comprises from 10 to 30 water monolayers disposed on the porous adsorbent;
exposing the crude oil solution to the supported water substrate for a period of time;
separating the supported water substrate from the crude oil solution;
washing the supported water substrate with a water immiscible solvent to remove at least one hydrocarbon while retaining the at least one interfacially active compound with the water monolayers on the supported water substrate;
displacing water from the plurality of water monolayers and the at least one interfacially active compound from the porous adsorbent with an alcohol and a polar solvent for the interfacially active compound to obtain a displaced phase, wherein the displaced phase comprises the water, the at least one interfacially active compound, the alcohol, and the polar solvent; and
drying the displaced phase to isolate the at least one interfacially active compound.
2. The method of claim 1 , wherein the porous adsorbent is silica-gel.
3. The method of claim 1 , wherein the porous adsorbent has a surface area of about 800 m 2 /g.
4. The method of claim 1 , wherein the period of time is greater than 2 hours.
5. The method according to claim 1 , wherein the water immiscible solvent comprises about 50% by weight of heptane and about 50% by weight of toluene.