Study on Performances of Two New Types of Gasoline Detergents and Their Effects on Fuel Properties

Recently, two types of new gasoline detergents had been developed in our laboratory namely 2-hydroxyl-3-para- polyisobutylphenoxy propyl amines and parapolyisobutyl- phenoxyethyl amines using polyisobutyl(Mw=815, 995)phenol, epoxy chloropropane, 1,2-dibromoethane, diamine and triamine. In current investigation, studies were focused on their performances, their thermal stability and their effects on gasoline physicochemical properties. The fuel oxidation reactor test was performed which results showed that deposits formed 0.84 mg/cm² from unadditized gasoline decreased to 0.30 ∼ 0.48 mg/cm² when 300 μg/g(ppm) of 2-hydroxyl-3-parapoly- isobutylphenoxy propyl amine was added during 35 hours oxidation at 110°C, while deposits formed 0.84 mg/cm² from unadditized gasoline decreased to 0.34 ∼ 0.52mg/cm² when 300μg/g of parapolyisobutylphenoxy- ethyl amine was added during tests. Also, reduction patterns of deposit formation with increase of their dosage were investigated. TGA curves demonstrated that all 2-hydroxyl-3-parapolyisobutylphenoxy propyl amines begin to decompose and lose weight at about 280°C and four parapolyisobutylphenoxyethyl amines are also of similar thermal stability with decomposing temperature at about 250°C, indicating that these two types of new gasoline detergents have relatively low CCD forming tendencies. Conclusions were also approached that, when these new detergents were added to gasoline less than 500μg/g, such fuel properties as Reid saturated vapour pressure, smoke point, copper corrosion, and distillation range exhibit no remarkable changes, while existent gum increases significantly.