The Study On Performance Of D-006 Resin Catalyst And Its Application On MTBE Synthesis

Methyl-tert-butyl ether , brief name MTBE , have a kind of ether smell ,is an ideal mix componen, ,is a kind of liquid that is colorless, transparent and high octane value to produce unleaded and high octane value and oxo-gasoline ,is already used widely as gasoline additive all over the world .It can not only increases efficiently gasoline octane value ,but also still improves the car performance ,lower CO content in the exhaust ,at the same time decreases the gasoline production cost .In addition MTBE is still a kind of important chemical material ,for example cracking to produce the high pure iso-butene .Iso-butene and methanol etherification proceeds according to the electrophilic addition mechanism ,Iso-butene makes protonation reaction as the proton acceptor under the acid catalyst function ,being born the positive carbon ion ,intermediate products react rapidly with nucleophilic reagent(CH3O- ) to produce MTBE .Therefore the first step is a process that controls reaction velocity decided by iso-butene concentration ,having nothing with methanol concentration. According to the mechanism , olefin protonation is a process of acid-alkali reaction , so the reaction is easy to happen when the acidity of catalyst and the basicity of olefin are very strong . It is the reason of high selectivity of MTBE that mix C₄ react with methanol to produce .Usually MTBE is a kind of compound that butene in C4 cut has additive reaction with methanol to get ,the reaction is a typical acid catalyst reaction. According to the theory ,in principle any strong acid substance can be used as MTBE catalyst .From current research and production application, used catalyst is mainly a strong acid macroporous cation exchange resin , also a general catalyst at present .It adopt styrene and divinylbenzene polymer as carrier ,the carrier proceed sulfonation to make strong acid macroporous cation exchange resin. Because functional group in resin framework has near character of inorganic acid in substance of swelling , it can be used as catalyst of etherification reaction, but normal cation exchange resin has poor heat resistance , is easy to have desulfonation, so is controlled at about 90℃,not over 120℃.Through research for iso-butene and methanol reaction ,the test contrasts the catalytic function of strong acid macroporous cation exchange resin , and research for resin character , pretreament method , influence of dosage and...