Research On Polymerization Process Of Coker Gasoline And Extracting Of Alpha-olefin From Coker Gasoline

Poly-alpha-olefins synthetic lubricant is a kind of hydrocarbon synthetic lubricant prepared with chemical synthetic method. Recently, with the growing society demands for energy conservation and environmental protection and engine oil for further heat stability, The lubricant blended by mineral base oil has not satisfied increasingly demanding deployment requirements of high-grade products. Poly-alpha-olefins synthetic lubricant is one of the important synthetic lubricants. It has a good performance in viscosity-temperature characteristics, wide range of liquid, low pour point, high viscosity index, small losses to evaporate, better sensitivity to additives, high thermal oxidation stability, non-toxic and less of anti-coking skin, as the same with the growing demand.In this thesis, the research was feasible to produce hydrocarbon synthetic lubricant with Coker gasoline as feed and Lewis acid AlCl3 as Catalyst. The effects of some parameters, including catalyst addition, reaction temperature, reaction time and reaction pressure on the production rate of hydrocarbon synthetic lubricant and polymerization activity were investigated. And a hydrolysis-neutralization process for treating the catalyst acid sludge from polymerization and the reusability of light distillate from polymerization were discussed. In order to effectively use theα-olefins in Coker gasoline, the explorative research was the method of liquid temperature swing adsorption separation for the separation of Alpha-olefin from Coker gasoline using zeolite.With Lewis acid AlCl3 as Catalyst, The optimum ??nological conditions of poly-alpha-olefins synthetic lubricant with middle and high viscosity were that the quality of Catalyst was 4%~6%, the temperature was 130℃, the reaction time was 4 hour, the pressure was 0.6 MPa, and the method of extending the reaction time and reducing the reaction temperature were used to produce hydrocarbon synthetic lubricant with low viscosity. The hydrolysis–neutralization method of catalyst acid sludge from polymerization was discussed, and this method would separate the residual oil which could be boiler fuel and sour water (including a lot of Cl-). The light distillates from polymerization were refined by acid-base; and the cuts after fractional distillation were used flushing oil and solvent kerosene.Alpha-olefin in Coker gasoline was absorbed separating by 5A or 10X zeolite, and the adsorption performance of 5A and 10X zeolite was compared. Elevated temperature could increase adsorption rate and decrease adsorption quantity. Increasing velocity could reduce adsorption quantity. Compared to synthetic lubricant produced by adsorbed oil and synthetic lubricant produced by Coker gasoline, the viscosity of synthetic lubricant produced by adsorbed oil was decreased and the viscosity index of synthetic lubricant produced by adsorbed oil was improved slightly.