The Research For Basic Nitrogen Removal From Fuel By Solid Phase Coordination Extraction

Nitrides contained in petroleum products may produce a significant effect on their stability. Serious atmospheric pollution can be caused by nitric oxides generated from burning nitrogen-containing fules . In developed countries and some big cities in china NOx is one of the most primary air polltutants , which is harmful to people and environment, and is also one of the items of air quality forecasting . The problem of creation of the chemical smog is a major concern we need pay attention to .They were discussed that the shortcomings and virtues of some denitrogenation technologies , such as acid refining , solvent refining , complexing refining , sorbent refining , and their combination , as well as biodenitrogenation and microwave treatmemnt denitrogenation . Aiming at above shortcomings , a new denitrogenation method was invented .Based on Lewis theory of acids and bases and similarity law, metal cation styrene resins , solid phase extraction sorbents for basic nitrogen compounds removal from diesel fuel , were prepared . The static adsorption capacity of metal cation styrene resins was Sr²⁺-cation resin> Mn²⁺-cation resin 2+-cation resin < Co²⁺-cation resin < Ni²⁺-cation resin < Cu²⁺-cation resin >Zn²⁺ -cation resin . The Sr²⁺-cation resin had a good adsorption capacity and the properties of it was also studied in detail. The results showed that adsorption capacity was 9.10 mg·g^-1 and the proper temperature of adsorption was 25℃. The adsorption isotherm of C₅H₅N on Sr²⁺-cation resin was a combined Langmuir and BET . The widely-used two-parameter Langmuir and Freunch equations were inapplicable for this case . Coordination molar ratio of C₅H₅N to Sr(â…¡) was 1:1. The physical structure of the resin had a great effect on adsorption capacity .The kinetics and thermodynamics of the adsorption of C₅H₅N on Sr²⁺-cation resin were studied . Meanwhile , the corresponding determing-rate-steps were ascertained and diffusion coeffients were calculated . The results showed that the adsorption of C₅H₅N on Sr²⁺-cation resin was controlled by particle diffusion control(PDC) if the concentration of C5H5N solution was larger than lOOmg/L (ï¿¡>,â– = 5.01xl0"7cm2s'') , otherwise , controlled by film diffusion control (FDC) if the concentration of C5H5N solution was less than 50mg/L (A/=6.77xlO"5cms"1) within temperature range of 288.15K—298.15K . The adsorption was spontaneous forAG°=-3Q92K//woi , less than zero . The enthalpy &H°(KJ/mol) was found to be110.8 , indicating the adsorption was endothermic .The effects of resin height in the column (or H/D , i . e . ratio of resin column to its diameter ), flow rate of the diesel fuel samples on adsorption , and the effects of composition , flow rate of the eluant on desorption were studied . The suitable methods were also established about extraction , elution and regeneration in the resin column.