Calculation And Application Of Hydrophile-Lipophile Banlance For Ionic Surfactants By Configuration-fragment Method

Surfactant is something which can obviously debase the interfacial tension of gas- water interface and oil-water interface. The word surfactant is a combination of surface, active and agent for short. Generally surfactant molecular is composed of hydrophile group and lipophilic group. Because of its dualism, the main function of surfactant ex-hibits on the surface and interface, it has great ability and high efficiency of debasing the surface and interfacial intension. Surfactant can form an ordered assembly system when the concentration of the solution comes up to an fixed value. Therefore, it has a series of function as wet and reverse-wet, emulsification and emulsion breaking, bubble and de-foam, increases solubility and etc. Thus in the lavation, the cosmetics, the spinning and weaving, the papermaking, the leather, the medicine, food, the petroleum, the rubber, the chemical fertilizer, the coating, the information material, the metal working, the dressing, the building, the environmental protection and so on, surfactant was widespreadly ap-plied in the different industry field. Surfactant was so widespreadly applied in the indus-try that caused many studies to study how to choose it correctly and use it reasonably. HLB value as an important parameter, becomes the key measurement factor naturally, and how to calculate the HLB value of surfactant also becomes the key of the study works.On the base of Davies'group contribution method to calculate HLB values, hydro-phobic value(logP) of configuration fragment was introduced, calculate the contribution values of the corresponding hydrophobic groups and use them to instead of the lipophilic groups'contribution values, the model equation was built up to calculate the HLB value by configuration-fragment method. This model equation greatly improves the HLB val-ues'prediction accuracy of ionic surfactants. By the computation and test of 87 ionic surfactants'HLB values, the average relative error was gained as 1.97%. Subsection sta-tistical correlation method was used to obtain the contribution of each EO group to HLB, and the contribution values was used to calculate the HLB values of polyethoxylated nonionic surfactants. By the computation and test of 162 nonionic surfactants'HLB val-ues, the average relative error was gained as 9.55%. Then the relationship between HLB value and CMC was correlated by non-linear method. Through preparing naphtha emul-sion, the influences of emulsifier's HLB value and preparation techniques on the emul-sion's stability and other relevant properties were investigated.