Synthesis And Application Of Ce(thd)₄ And Its Addition Agent

Going with the development of economy, the world environment condition gets worse.Asthe automobile exhaust is one of the biggest pollutant source, improving the quality ofgasoline is imperative under the situation. Using gasoline additives including octane-improvement agents(anti-knock agents) is the most efficient and economical way to improvethe gasoline quality. MTBE has the most percentage in the present market, but it will quit thethis stage soon because of its pollution to underground water. Scholars believe that efficientcomposite additives based on organometallic antiknock agents will be hot spots. Under thisbackground, our team begin the research on new organometallic antiknock agents.(2, 2, 6, 6-tetramethyl-3, 5-heptanedionato)-cerium(â…£)(Ce(thd)₄) is synthesized accompaniedwith its addition agent diisobutene(DIB).Starting with triethylacetic acid, after esterification, claisen condensation and complexing,final product Ce(thd)₄ is obtained. Synthesis of Hthd is studied by orthogonal experiments.Optimized conditions are as follows:using ethanol solution of sodium ethylate as catalyst, themole ratio of ester to ketone is 1.2:1; the temperature is 90℃; the dosage of solvent is 10mLwith reaction time 5h. Final product is confirmed by melting point measuration andMS. Antiknock mechanism of Ce(thd)₄ is discussed.Using strong acid cation exchange resin homemade as a catalyst, t-butanol as selectivityimprover, diisobutene is synthesized on the basis of literatures. Optimized conditions are got byorthogonal experiments:the temperature is 90℃, the time is 2h, the mole ratio of t-butanol toisobutene is 0.5%: 1, the dosage of catalyst is 1%. The product is determined by standard product and GC.Test results of oil-solubility and corrosiveness indicate that both products are suitable asexcellent gasoline antiknock agents. Application test results indicate that FCC can be upgratedto 90# gasoline with 5%(volume) diisobutene and 0.016g/L Ce; 90# gasoline can be upgradedto 93# gasoline with 10% diisobutene and 0.08g/L Ce.