烷基苯磺酸盐在油水中的分配

为了发挥活性剂间的协同效应 ,矿场使用的表面活性剂多为复配体系。然而复配体系流经多孔介质时所产生的色谱分离会使其协同效应降低或消失。除表面活性剂在固体表面上的吸附之外 ,表面活性剂复配体系在油水中分配的差异是造成其色谱分离的一个重要因素。对不同结构的烷基苯磺酸盐在油水中的分配规律的研究表明 ,烷基苯磺酸盐与油接触后在油水中的分配比和分配损失与其结构有关 :分子量增大 ,烷基苯磺酸盐在油水相间的分配比增大 ,分配损失也增大 ;同样分子量的烷基苯磺酸钠 ,其直链结构的分配损失大于支链结构的分配损失。另外分配损失还与油相性质和水相性质有关。油水比也是影响烷基苯磺酸盐在油水中分配的一项重要因素 ,油水比增大 ,烷基苯磺酸盐的分配损失随之增大。图 4参 3

Allocation of alkylbenzene sulfonate in oil or water phase

The mixed surfactants are usually used to obtain "synergism" in chemical flooding, but the synergism can be collapsed because of the chromatographic movement of different surfactants through porous media. Expect the absorption of surfactants; an important factor affecting chromatographic movement is the allocation of mixed surfactants in the various phases present in the reservoir. Variation of allocation for alkylbenzene sulfonate with different structure in oil or water phase is studied in this paper. The results indicate that the allocation of alkylbenzene sulfonate in oil or water phase is related to its structure. With molecular weight increase, the allocation loss of alkylbenzene sulfonate increases. For alkylbenzene sulfonate with same molecular weight, allocation loss of linear alkylbenzene sulfonate is larger than branched alkylbenzene sulfonate. The allocation for alkylbenzene sulfonate in oil or water phase is related to properties of oil and water phases. Oil water ratio is an important factor influencing the allocation of alkylbenzene sulfonate in oil or water phase. With oil water ratio increase, the allocation loss of alkylbenzene sulfonate increases.