The Synthesis And Study On Diesel Flow Improvers

With the development of our national economy, the demand for the energyincreased day by day, especially is the requirement of diesel fuel urgent. However,diesel fuel is not only insufficient on supplying, but also limited by temperature in using(Diesel oil is unable to use normally around cold filter plugging point). so it makes thecontradiction obvious between the supply and demand of diesel fuel. By using diesellow temperature flow improvers can alleviate above- mentioned questions and createbenefits for oil plant too. Purpose of this paper lies on preparing and sifting better diesel flow improvers(DFI). Through reading reference and in order to master the research and appliancecondition of diesel flow improvers, the component of five kinds diesel flow improverson sale are analyzed and compared. The results show that the copolymers of these DFIare all ethylene-vinyl acetate, the difference between them is only on the content ofvinyl acetate. The solvents of these five DFI are naphtha or aromatic hydrocarbon. On the ground of summarizing reference documents, some monomers such asmethyl acrylic acid long chain carbon ester, Maleic long chain diester, , vinyl acetate,styrene, acylamide are selected to synthesize a series of DFI separately. Among them, methyl acrylic acid long chain carbon ester and Maleic long chaindiester are made by oneself. The level of theirs esterification rate could determine themonomer's purity. There are many factors influencing the esterification reaction, so theorthogonal method is adopted to confirm the best reaction condition. Regarding TuHa 0#, TuHa -10# and TuHa -20# diesel fuel as samples, the fourabove-mentioned copolymer's low-temperature improvement ability were tested. Inorder to understanding three diesel oil' paraffin series construction and content,adopting the urea complex method to draw the paraffin and determine them by usinggaseous phase chromatogram- mass spectrum. The experimental result show that:among the alkane content of 0# diesel, hexadecane is the most heavy, the content ofheptadecane and pentadecane is greater and close, total relative century of these threecontent is 45%; among the alkane content of -10# diesel, the heptadecane is heaviest ,hexadecane is close to the content of heptadecane, the content of octadecane isrelatively large too, The total of the three is 48%; among the alkane content of -10#diesel, the relative content of heptadecane is largest, the content of hecadecane is similarto it, Secondly is docosane, the sum of relative content of the three is 57%. So, when synthesizing the copolymers, the content of hexadeanol and octadecylalcohol ester should be relatively larger in order to improving sensitivity. The concreteproportion of long chain carbon alcohol ester is 12:14:16:18=1:1:2:2. Through the references documents, 2-2'-Azo-bis-iso-butyronitrile is Selected to bethe initiator, the toluene is regarded as the solvent, investigated the influence ofmonomer's proportion, monomer's consistency, initiator' consumption and reactiontemperature on the average molecular weight of the copolymer. In order to signify the average molecular weight of the copolymer, characteristicviscidity of four kinds of copolymer' rare solution is determined, the relationshipsbetween characteristic viscidity and cold filter plugging point, the relationships betweencharacteristic viscidity and solidifying point were studied. the law between them wasalso described. The four DFI' action mechanism were discussed through analyzing structure ofcopolymer.