A kind of preparation method of pervaporation membrane for gasoline desulfurization

Abstract

The invention provides a method for preparing a pervaporation membrane for gasoline desulfurization. The pervaporation membrane comprises a porous support base membrane and a metal-organic framework / polyethylene glycol composite layer coated thereon, that is, a MOFs / PEG composite layer. The metal-organic framework is any one of ZIF-8, ZIF-7, MAF-6, UiO-66, MOF-508a, and the MOFs / PEG composite layer adopts metal-organic framework particles, polyethylene glycol, It is prepared by mixing inorganic particles, cross-linking agents, catalysts and solvents. The inorganic particles are any one of zinc nitrate, zinc oxide, zinc hydroxide, and zirconium chloride, and the metal elements contained in the inorganic particles are mixed with metal organic compounds. The metal elements contained in the skeleton remain the same metal. The invention is applied to gasoline desulfurization, has high sulfur enrichment factor and good permeation flux. The sulfur-rich factor far exceeds the highest value reported in the current literature, and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of pervaporation membrane separation, and in particular relates to a preparation method of a pervaporation membrane for gasoline desulfurization. Background technique [0002] The sulfur compounds in gasoline will cause serious air pollution. The sulfur compounds in gasoline will generate sulfur oxides after combustion, and when they are discharged into the air, they will form acid rain and pollute the environment. At present, my country's gasoline sulfur content is implemented according to the National IV standard, and the upper limit of gasoline sulfur content is 50ppm. However, from January 1, 2018, the country will fully implement the National V standard, stipulating that the sulfur content of gasoline should not exceed 10ppm. Therefore, increasingly Strict environmental protection standards require oil refineries to produce ultra-low sulfur clean gasoline. The research and development of gasoline deep desulfurizat...

AI Technical Summary

Problems solved by technology

From the above literature reports, it can be seen that the modification of polymer membranes by existing inorganic particles can effectively increase the permeation flux, but the improvement of the sulfur enrichment factor is very limited, and even the filling of inorganic particles in some studies will reduce the enrichment of polymer membranes. Sulfur factor, which may be due to the poor adaptability between polymer-based membranes and inorganic particles in the developed hybrid membranes. For example, the molecular chains of hydrophobic PDMS are relatively flexible, and it is easy to enter zeolite, In the hydrophobic pores of porous materials such as CPO-27-Ni, some inorganic particle pores are blocked, and it is difficult to give full play to the preferential adsorption of sulfur by inorganic particles, resulting in a low sulfur-rich factor.