Paraffin wax deposition from middle distillate fuel low temperature is one of the serious and long standing problems in petroleum industry. At low temperature, the crystals of wax easily form impermeable cakes, which can block filters and eventually lead to engine failure. The mechanism of the depressants action has been suggested according the adsorption of each additive. Adsorption of the additive on the surface of the wax particles inhibits their growth and alters the crystal habits through micelle core. As the results the surface and thermodynamic parameters confirm the suggested mechanism and the decreasing of pour point. Many methods have been attempted for the prevention of the crystals mating together. Some amphoteric surfactants N-Decyl-N-benzyl-N-methylglycine(AB) and N-Dodecyl-N-benzyl-N-methylglycine(CD) were prepared in the laboratory. The physicochemical chemical characteristics were investigated. The adsorption behavior of these surfactants at oil/air interface was investigated by measuring the surface tension and interfacial tension as function of concentration. Surface properties, in particular the critical micelle concentration (CMC), the maximum surface excess (Γ_CMC) and the minimum surface area (A_MIN) were measured. It is found the surface and thermodynamic properties of the prepared surfactants depend on their hydrocarbon chain length. Also it is found that there is a good relation between surface properties of the additive and their efficiency in depressing the pour point. The mechanism of the depressants action has been suggested according the adsorption of each additive. Adsorption of the additive on the surface of the wax particles inhibits their growth and alters the crystal habits through micelle core. This is resulted in a multilayer, more isotropic wax crystal, and thus only a fixed amount of wax separates at any given temperatures.

来自中间馏分燃料低温的石蜡沉积是石油工业中严重且长期存在的问题之一。在低温下，蜡的晶体容易形成不可渗透的滤饼，这会阻塞过滤器并最终导致发动机故障。已经根据每种添加剂的吸附情况提出了抑制剂作用的机理。添加剂在蜡颗粒表面的吸附会抑制其生长，并通过胶束核心改变晶体习性。结果，表面和热力学参数证实了建议的机理和倾点的降低。已经尝试了许多方法来防止晶体相互配合。一些两性表面活性剂Ñ -Decyl- Ñ苄基Ñ在实验室中制备了-甲基甘氨酸（AB）和N-十二烷基-N-苄基-N-甲基甘氨酸（CD）。研究了其理化化学特性。通过测量表面张力和界面张力随浓度的变化，研究了这些表面活性剂在油/空气界面的吸附行为。表面性能，特别是临界胶束浓度（CMC），最大表面过量（Γ _CMC）和最小表面面积（A _MIN）进行了测量。发现制备的表面活性剂的表面和热力学性质取决于它们的烃链长度。还发现添加剂的表面性能与其降低倾点的效率之间存在良好的关系。已经根据每种添加剂的吸附情况提出了抑制剂作用的机理。添加剂在蜡颗粒表面的吸附会抑制其生长，并通过胶束核心改变晶体习性。这导致了多层的，各向同性的蜡晶体，因此在任何给定温度下仅分离出固定量的蜡。