Study On Oil-soluble Drag Reduction Agent Prepared By Mixing α-Alkenes Solution Copolymerization

Since the world's economic is recovering gradually, the consumption of crude oil and various refined oil is increasing correspondingly. The technique and product for piping transport is fast developing. The drag reduction agent which is high polymer with high flexibility is polymerized by mixingα-alkenes. And its molecular weight is very huge (>106). By adding a bit of it in the pipe which is transporting the crude oil and refined oil, the DRA can increase the transport quantities, decrease the friction resistance of pipeline and the energy and the investment of equipments, and improve the utilization rate of pipes. Its meaning is important.By the orthogonal experiment, we picked out the important technical factors that affected the drag reducing performance ofα-dodecene-α-octene copolymers which had been made by solution polymerization. Using the single factor test, we review the important contributing factor in turn– the category of solvent; the concentration of solution; the temperature of the second step reaction; the proportioning of monomers; the dosage of DDS; the dosage of the catalyst and the dosage of the cocatalyst. With the aim of removing the solvent in the drag reduction agent which was made in solution copolymerization, we have used the method of decompression-steaming and reviewed the mechanisms of the decompression. The drag reducing performance of theα-dodecene-α-octene copolymers which had been polymerized in difference conditions were evaluated by the simulative loop evaluation apparatus and GPC. Finally we determined the optimum technological conditions forα-dodecene-α-octene solution copolymerization in 200mL reaction system: the n-hexane used as solvent; the concentration of the solution (V%)=30%; theα-octene in the solute (V%) = 15%; the dosage of the catalyst = 0.16g; the dosage of the cocatalyst = 15mL; the dosage of DDS = 0mL; the temperature of original reaction was -5℃; the time of the first step reaction was 10 mins. Under the optimum technological conditions, the drag reducing efficiency of oil-soluble drag reduction agent which has been removed the solvent approached 55.2%. Results by GPC indicated that the process of decompression-steaming had little effect to the part of super high molecular weight. Results by the simulative loop evaluation apparatus indicated that the method of decompression-steaming could remove the solvent more than 90%, but the drag reducing efficiency only reduced about 10%. This method is valuable for scale-up.