【摘要】：為研究分子篩催化甲醇與甲醛反應(yīng)合成聚甲氧基二甲醚(PODE_n)的反應(yīng)過程特點(diǎn),在均相實(shí)驗(yàn)裝置中,考察了不同溫度和不同原料配比下該反應(yīng)的化學(xué)平衡特性和動力學(xué)特性。實(shí)驗(yàn)采用1st Opt軟件中擬牛頓-全局優(yōu)化算法計(jì)算出混合溶液中單體甲醛、甲醇和水的真實(shí)含量,進(jìn)一步得到合成PODE_n的平衡常數(shù)。計(jì)算結(jié)果表明,實(shí)驗(yàn)條件下的混合溶液中單體甲醛摩爾分率數(shù)量級為10~(-3) mol/mol,即溶液中單體甲醛含量極低。通過范特霍夫方程,合成PODE_n反應(yīng)的反應(yīng)焓分別為-34.24 k J/mol(n=2)、-27.12 k J/mol(n≥3),即合成PODE_n的反應(yīng)為微放熱反應(yīng)。擬均相催化反應(yīng)動力學(xué)模型能很好地反映PODE_n的生成過程,為工業(yè)上反應(yīng)器的設(shè)計(jì)提供理論支持。
[Abstract]:In order to study the characteristics of the synthesis of polymethoxydimethyl ether (PODE_n) from methanol and formaldehyde catalyzed by molecular sieve, a homogeneous experimental device was developed. The chemical equilibrium and kinetic characteristics of the reaction were investigated at different temperatures and different feedstock ratios. By using the quasi-Newton-global optimization algorithm in 1st Opt software, the real content of formaldehyde, methanol and water in mixed solution is calculated, and the equilibrium constant of synthetic PODE_n is obtained. The results show that the molar fraction of monomer formaldehyde in mixed solution is 10 ~ (-3) mol/mol, that is, the content of monomer formaldehyde in solution is very low. The enthalpy of synthesis of PODE_n is -34.24 k J/mol (n ~ 2) and -27.12 k J/mol (n 鈮，

本文編號：2358657