二甲醚在液体石蜡中的溶解度和体积传质系数的研究

Study on Solubility and Volumetric Mass Transfer Coefficient of Dimethyl Ether in Liquid Paraffin

基于等容吸收降压原理,在314.15～517.15K、0.05～0.4MPa、搅拌转速800r·min-1条件下,在机械搅拌高压釜中,测定了二甲醚在液体石蜡中的溶解度和体积传质系数.结果表明二甲醚的溶解度随着压力的升高而增大,随温度的升高而减小.溶解度与压力的关系曲线为通过原点的直线,符合亨利定律.回归出了二甲醚的溶解度系数Hi与温度T的关联式,溶解度的计算值与实验值的相对误差小于5.0%.二甲醚的体积传质系数随温度和压力的升高而增大.

According to the theory of isopyknic gas absorption, solubility (C*) and volumetric mass transfer coefficient (kLα) of dimethyl ether in liquid paraffin were measured at 314.15-517.15 K, 0.05-0.40 MPa, and 800 r&middotmin-1 stirring speed in a high-pressure agitated vessel. The variation of system pressure with time was recorded by using an on-line computer and acquisition system. The results show that equilibrium solubility (C*) of dimethyl ether increases with the increase of pressure, but decreases with the increase of temperature, and the volumetric mass transfer coefficient (kLα) of dimethyl ether increases with the increase of pressure and temperature. The obtained relationship between solubility and pressure is linear and passing through the origin, it means that the obtained solubility of dimethyl ether in paraffin follows the Henry's Law. The relationship between solubility coefficient of dimethyl ether and temperature was correlated. The relative error between the calculation data and experimental data of the solubility of dimethyl ether in paraffin is less than 5.0%.