Phase inversion is a process where one material from a liquid-phase is transformed with all the aid of a polymer that is managed into a good phase. There are four basic methods which are participating in producing such phase inversion membranes. They are as follows; precipitation in the vapor phase, allowing precipitation together with the aid of managed evaporation, phase separation which is thermally induced last but not least immersion precipitation. Among these four basic methods, immersion precipitation is the one which is largely employed. As follows, the four basic techniques of phase inversion are discussed in more detail. A solvent -polymer mixture emerge a vapor environment where there is a nonsolvent which is saturated together with the same solvent and is put on a movie. The diffusion of the nonsolvent to the cast film forms a membrane as a result. The result of this process is a membrane that is porous. The other phase inversion technique which is the precipitation by controlled evaporation consists of a polymer that is dissolved in a solvent along with a nonsolvent combination. The high volatility results in the evaporation of a membrane as well as the solvent are formed as a result. Thermally induced phase separation method of phase inversion makes usage of a solitary or a combination of of solvent polymer solutions which can be cooled down so that you can achieve phase separation stage. This really is as the membranes are formed as a result of solvent evaporation in this procedure, a method that is often utilized in the planning of synder membranes. In this this method, the mixture of mass transfer processes and phase separation affects the structure of the membrane that is certainly formed. The polymer that is used in this process should be soluble in a solvent mixture.