The Analysis Of Preparation Of Diamine From Dibasic Acid

The polyamide material have got a wide range of application on auto industry andaviation. As the important intermediate, industrial production of decanediamine anddodecamethylenediamine are the key to application of the material. Industrial production ofdecanediamine in our country started early but low quality and high costs during nowadays.Few company are left from dosens in the last century. While industrial production ofdodecamethylenediamine begin since21st century and few enterprise in our country work onit. To improve these industry can make a great contribution to the economy and obtainemployment, and most important to be part of independent study of our country.This article is about the transformation from sebacic acid to decanediamine and thetransformation from dodecanedioic acid to dodecamethylenediamine. The products are testedby IR and GC-MS and the most fitted experimental programs are settled through contrasttest.The primary coverage is statement below:1.The sebaconitrile is prepared through sebacic acid and composed catalyst. The mostfitted experimental program contains: spending nine hours on heating up from roomtemperature to220℃, then rising from220℃to260℃and heat preservation lasts fou threehours. The mass ratio between ZnO and Al2O3is two to one and catalyst amount cost sixpercent of mass of reactant. The purity quotient of sebaconitrile is92%tested by IR and GC-MS.2. The decanediamine is prepared by sebaconitrile as the reactant and Raney’s nickel asthe catalyst. The most fitted experimental program contains: temperature range from70℃to95℃and pressure no more than2.1MPa.The mixing rate is settled on600r/min. The mass ofsolvent alcohol is1.1times to the reactant sebaconitrile while the mass of inhibitor KOH cost0.6%of mass of reactant.20um Raney’s nickel is chosen as the catalyst and yield ofdecanediamine is92%.3. The Dodecanedinitirle is prepared by dodecanedioic acid as reactant. The most fittedexperimental program contains: the maximum temperature is280℃and reaction time cost eleven hours. The mass ratio between ZnO and Al2O3is two to one and catalyst amount costnine percent of mass of reactant. The purity quotient of Dodecanedinitirle is93%tested by IRand GC-MS.4. The dodecamethylenediamine is prepared by Dodecanedinitirle and hydrogen. Themost fitted experimental program contains: the maximum hydrogenation temperature is110℃while pressure no more than2.1MPa. The mass of inhibitor KOH cost0.8%of mass ofreactant while catalyst Raney’s nickel cost15percent. The mixing rate is settled on600r/minand yield of dodecamethylenediamine after reduced pressure distillation is83%.