Light Olefin Controlled Polymerization And Pentaerythritol Ester Base Oil Clean Production

With the deepening development of petroleum refining and petrochemical products processing,catalytic cracking,thermal cracking and coking processes produce a large number of low-carbon olefins(C3/C4 olefins)by-products.But,in the current market,light olefins such as propylene and butene are still used as fuel-based resources,resulting in waste of resources.The intensification of the energy crisis has made the rational use of these low-carbon olefins more and more urgent.In addition to improving the utilization of low-carbon olefin resources,in recent years,the use of low-carbon olefins for olefin oligomerization technology and the comprehensive application of oligomers have become an effective way to develop olefins.Firstly,Aluminum ion catalyst was used as the active component,and the porous polytetrafluoroethylene supported aluminum trichloride catalyst material was used as the carrier to prepare the supported Aluminum ion catalyst by impregnation method.Using propylene as raw material,the effect of catalyst dosage,reaction temperature and reaction time on the polymerization reaction was investigated by using a small fixed bed reactor,and the polymerization products were aligned and characterized.The results show that the optimized polymerization conditions were as follows:20 g of catalyst,40℃ of temperature,4 h of reaction time.In this condition,the product was a light yellow transparent oily liquid,the ash content was 0.15%,the pour point was-63℃,and the degree of polymerization could achieve<50 polymerization degree.The porous polytetrafluoroethylene supported aluminum trichloride catalyst could be reused and used five times without significant decrease in catalytic efficiency.A compound obtained by polymerizing low-carbon olefin based on supported catalyst,which contains a part of double bonds and has many branches,can be used as lubricating oil.In order to further enhance its lubricating properties and increase the practicality,it is often considered to be used after compounding with other base oils.Considering that pentaerythritol ester is a good base oil,low-carbon olefin polymer can complex with it and increase the effect of base oil.In the second part of this paper,tributyl phosphate was used as a catalyst to synthesize pentaerythritol tetrahexanoate,pentaerythritol tetraenanthate,pentaerythritol tetraoctanoate and pentaerythritol tetra-mixed acid ester by reacting pentaerythritol with caproic acid,heptanoic acid,caprylic acid and mixed acid(octanoic acid,heptanoic acid,and citric acid are mixed according to a certain ratio).The reaction conditions were as follows:1.5%of catalyst,190-210℃ of temperature,10h of reaction time.In this conditions,the desired base oil product can be obtained.On this basis,the study also conducted a pilot test in a 500 L reactor.In addition,due to the high COD grease wastewater generated in the base oil production process,in order to ensure clean production,the third part of this paper has studied the treatment of alkyd wastewater.The flocculant and activated carbon and hydrogen peroxide composite process are used to treat the oil wastewater.The results show that the optimized process conditions were as follows.The flocculant addition was 0.5%,reaction temperature was 60℃,reaction time was 4 h,reaction pH was 4,activated carbon addition was 2%,hydrogen peroxide addition was 6%.Under this condition,the COD and chromaticity of the oil wastewater were greatly improved after treatment.The COD removal rate was 82.33%and the decolorization rate was 93.75%.Finally,the paper explores the application of low-carbon olefin paraffin oil.This study attempts to use a low-polypropylene paraffin oil,pentaerythritol ester and their composites to provide a low-condensation point diesel lubrication improver.The experimental results show that the use of low-propylene paraffin oil or pentaerythritol ester alone can improve the lubricating properties of diesel oil,and its slightly better than the commercially available acid-type and ester-type anti-wear agents.When used in combination,the effect is obviously improved,and even if the dosage is reduced,the effect is still relatively obvious.In addition,this study also mixed low-polypropylene polymer and pentaerythritol tetra-mixed acid ester in a mass with the ratio of 1:1 to obtain a product with solidifying point lower than-60℃.The product has a low solidifying point and can meet the engine start under ultra-low temperature conditions can extreme conditions.