The Study Of Catalytic Amination Of Polyether Polyols

Amino-Terminated Polyether is a class of amines compounds containing specificfunctional groups, which can react with a variety of groups, so it has been widely used inpolyurethane, lubricant additives, epoxy curing agents and ion exchange.Technology isrelatively backward in the country, due to the high reaction conditions,difficult to synthesisand poor catalytic effect, which was already part of the literature, but have not carried outlarge-scale production.This study is catalytic reaction of polyether polyol, ammonia, hydrogen and otherreactants for preparing low molecular weight amino-terminated polyether. By changing theconditions of the catalyst preparation process, the good performance of the catalyst isprepared for catalytic amination of polyether polyols, and the effects of various preparationconditions on the catalytic performance is analyzed.(1) Water as a solvent for preparing ruthenium-based catalyst:The influence of different carrier on the catalyst were investigated, it is proved thatruthenium-based catalyst prepared in aluminum-magnesium composite carrier can effectivelyimprove conversion rates and improve product colors. The carrier was prepared and loadedwith different active ingredients by changing the pH, the aluminum-magnesium ratio, thecalcination temperature. The effects of conditions, including active content, reductiontemperature, the type and content of additives and washing on catalytic activity, isinvestigated. The conclusion is that a different pH, aluminum-magnesium ratio andcalcination temperature has a significant impact on the carrier when water is a solvent. Theoptimal conditions for preparing the support: pH about9.0, Al-Mg ratio at20.0wt%, thecalcination temperature at550℃. The optimal conditions for preparing catalyst: activecontent at1.5wt%, KNO3as additives, additive ratio (K:Cl=4), at600℃for reduction, toachieve good catalytic activity, the conversion was60.0%, and the product as a colorless.Additionally, ammonia washing and a secondary reaction can improve the reactivity of thecatalyst.(2) Methanol as a solvent for preparing ruthenium-based catalyst:Solvents, different carriers in the same solvent, active content, reduction methods,reduction temperature, rotary evaporation method and time, adding a stabilizer, adding asecond active ingredient, washing etal was investigated on ruthenium-based catalystperformance about polyether polyols catalyzed amination, and the effect of different solventsand rotary evaporation methods was analyzed on catalyst activity. A variety of compositecarriers were characterized and the effects of the preparation conditions on the catalysts wereanalyzed. With catalytic conditions evaluated, the optimum preparation conditions: methanol as the solvent, the active content at1.5wt%, rotary steam for20minutes after dipping for30min, after reduction at650℃. The conversion rate of the polyether polyol is77.5%and theproduct is colorless.