Purification process and purification devices for liquid crystal

The present invention relates to a device and a process for liquid crystal purification, the process includes steps following: (a) providing a liquid crystal, an inorganic salt and a sealed chamber with a filter; (b) mixing the liquid and the inorganic salt to a mixture; (c) transferring the mixture to the sealed chamber with a filter; (d) providing a high-pressure inert gas to filtrate the mixture; and (e) obtaining a liquid crystal after filtration; wherein the inorganic salt were have pore structure within a diameter less then 15nm; the pore diameter of the filter ranged in 0.1-0.5 m; and the inert gas were have the pressure ranged 0-15kg/cm2.