Study On The Synthesis And Properties Of Copolymers As Low-Temperature Flow Improver For Diesel

The text relates to the development and synthesis of new kind diesel fuel low-temperature flow improver(DFI)for the characteristics of the Xinjiang local high wax content of diesels, which is composed of the following parts:(1) The contents of n-paraffin and carbon number distribution in n-paraffin wax of diesel of the diesels of Xinjiang were determined by urea adduction,nuclear magnetic resonance spectrum,GC-MS,The results of method would be regarded as an important reference for future research of pour point depression of diesel.(2) Several kinds of polymerization monomer such as dibehenyl styrenemaleic,fumarate-vinyl ester,alkyl acrylate are synthesized. The optimal experiment conditions are studied, the structures are identified by IR spectroscopy.On the base of above experiment, diffierent series of polymers are produced by using styrene,vinyl,maleic anhydride,hexadecyl amine and octadecyl amines raw materials. The polymer structure is tested by IR spectroscopy.(3) The help function of DFI are further evaluated. The improver is applied to four diesel fuel produced by crude oil of Xinjiang as raw material. CFPP of the Tuha0#diesel fuel is lowered by 2-8℃, Dushanzi0# diesel fuel is lowered by 6-8℃, Kelamayi0# diesel fuel is lowered by 6-14℃, Wushihua0# diesel fuel is lowered by 3-7℃.According to the results of the cold filter plugging point test, it is conclude that the impressibility of DFI to fuel is not only connected with the alkyl side chain and the polarity group of medicine oneself, but also the component, technology and directions for producing of fuel and so on. For increasing the oil dissolving property and dispersion of DFI, Compared with the present using DFI in our country and the results of reports, the developing comes to an advanced level, and is placed in the lead level in our country .(4) the mechanism of the synthesized low temperature flow improver was explored using hight emperature gas chromatograph,the X-ray diffraction and Environmental Scanning Microscope method.Results showed that wax crystal was mostly composed of n-paraffin with carbon number was changed;The wax crystals became smaller of diesel fuel with DFI;The microscopic images revealed that the shapes of wax congeries change from the needle to the granular Played a reduction in diesel cold filter plugging point role.