Research Of The Synthesis Of Ethers Additive Of Methanol Gasoline

Methanol has good combustion performance, low emissions, high octane numberantidetonating quality, abundant resources and technology maturity. So, it is considered as apotential energy alternertives with great market. But due to the physical and chemicalproperties of methanol, need to add a cosolvent to increase the intermiscibility of methanolgasoline. raw material and environmental factors restrict production method of traditionalethers additives. Thus synthesis of ether additive from methanol and low carbon alcohol is anew way for methanol gasoline.Thermodynamics of the synthesis of MTBE from methanol with tert-butyl alcohol (TBA)is studied in this paper. The standard enthalpy change, the gibbs free energy and equilibriumconstant under different temperature are getted with gas phase and liquid phase. The influenceof temperature and phase behavior of reaction are discussed. Thermodynamic basic data isgetted. Reaction conversion rate, reaction temperature and reaction equilibrium of thesynthesis of MTBE from methanol with tert-butyl alcohol (TBA) is studied to provideguidance for the synthesis of ethers from methanol and low carbon alcohols equilibriumconversion rate and yield and equilibrium composition of the synthesis of ethers frommethanol and low carbon alcohols are calculated and analyzed with Different raw materialratio in the conditions of273.15～423.15K,0.1MPa. At the same time of methanol andmixed alcohol reaction the law reaction of methanol and mixed alcohol is studied to makepeople have a clear understanding of the basic rule of reaction process and provide theoreticalguidance for the industrialization.It is showed that Methanol with tert-butyl alcohol (TBA) is spontan eous exothermicreaction in liquid phase. The heat effect and equilibrium constant decreased with the increaseof temperature. Compared with the ether reaction on synthesis of MTBE at the same temperature, Synthesis of isobutylene and dimethyl ether occurred more spontaneously, andthe reaction equilibrium constant is higher. Synthesis of isobutylene occurred mostspontaneously and the reaction equilibrium constant is the maximum, Synthesis of Tert-butylether get the lowest. Compared with the gas-phase reaction, MTBE in liquid phase is higherthan that in gas phase, and the reaction occurred more spontaneously and owned the greaterreaction equilibrium constant. Therefore,the reaction is favored in liquid phase. The synthesisof MTBE is no more dominant than other reactions,and high MTBT yield can not be obtainedunless under lower temperature. The optimal methanol/Tert-butanol is about2:1.Synthesis of ethers from methanol and C4alcohols. The influence of273～373K andn(methanol)/n(C4alcohols) on the conversion and productive rate is also studied to providetheoretical guidance for the synergistic effect of methanol and C4alcohols and the productionprocesses. The results indicate that optimal temperature for the synthesis of methanol andalcohols is333～363K and n(methanol)/n(C4alcohols) is about1:1～3:1.The thermodynamic analysis for the synthesis of ethers from methanol and C2～C5alcohols is conducted. The influence of temperature and the n(CH3OH)/n(C2～C5alcohols) onreaction process are investigated. The results indicated that the optimal temperature range is333～363K and n(CH3OH)/n(C2～C5alcohols) is about1:1～3:1for the synthesis of ethers.On the above conditions, the equilibrium conversions are all above95%and the yield ofmethyl ethyl ether is the highest. The appropriate reaction conditions of the homogeneoussynthesis of ethers from methanol and C2～C5alcohols is estimated. The temperature range is333～363K, the concentration of methanol is0.3~0.5.