<正>采用廉价的硫酸分别部分交换咪唑型和吡啶型季铵盐中的氯离子，得到在室温下为液体的混合离子液体2[BMIM]Cl/[BMIM]2SO4与2[BPy]Cl/[BPy]2SO4，并在所合成的混合离子液体中，进行了乙酸钠与苄氯反应合成乙酸苄酯的研究；探讨了温度、反应时间和乙酸钠与苄氯的摩尔比对乙酸苄酯产率的影响，得到了合成乙酸苄酯的最佳工艺条件。将两种混合离子液体2[BMIM]Cl/[BMIM]2SO4和2[BPy]Cl/[BPy]2SO4进一步混合，得到的乙酸苄酯的产率高于单独使用2[BMIM]Cl/[BMIM]2SO4或2[BPy]Cl/[BPy]2SO4混合离子液体时的值，且当两种混合离子液体的摩尔比为1∶1时，乙酸苄酯的产率达到最大值。该方法可简化离子液体的生产工艺，有效降低离子液体的生产成本。

Some small section steel soil-cement walls are applied to foundation pit support in stance. But there isn’t acquainted with the wall’s action mechanism. Through the bending experiments on small H-Steel soil-cement model beam, basedon the similarity theory, the combined action mechanism of section steel and soil-cement in the model beam is set forth in this paper. The experiments showed that the soil-cement made great contributions to the rigidity of compound beam and also showed that both section steel’s and soil-cement’s contri butions to the rigidity changed before or after the soil-cement cracking. Therefore, the con cept is given of soil cement and section steel relativity rigidity contribution coefficient, the ri gidity formula of compound beam and the acquisition value of the rigidity Contribution coeffi cient. The frictional resistance is obtained between the clay (or sand) soil-cement and the section steel. This frictional resistance is a direct proportion to the soil cement strength. The different compound form of double section steel ends has a little influence onthe soil cement rigidity contribution coefficient and the cracking uhimate deflections. The cracking ultimate deflections of the compound beam are also obtained, h concludes that the double section steel hinged girder is more applicative in the practice under the analysis of combined action mechanism.