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用流动汽液平衡釜测定了如下四个二元体系三个三元体系在0,12,22℃下的汽液平衡: ①1,4-戊二烯(1)与异戊二烯(2);②1,4-戊二烯(1)与2-甲基丁烯-2(2);③1,4-戊二烯(1)与正戊烷(2);④1,4-戊二烯(1)与乙腈(2);⑤1,4-戊二烯(1)与异戊二烯(2)及乙腈(3);⑥1,4-戊二烯(1)与异戊二烯(2)及DMF(3);⑦1,4-戊二烯(1)与异戊二烯(2)及NMP(3)。四个二元体系平衡数据均通过热力学一致性检验。用Wilson方程关联二元数据,汽相摩尔组成平均偏差△y<0.01,对三元体系数据进行推算△y<0.02。用汽液色谱测定了1,4-戊二烯在NMP、DMF及乙腈溶剂中不同温度下的无限稀释活度系数(z~∞),相对挥发度(α~∞)及选择性(S~∞),得到了1,4-戊二烯在上述三种溶剂中的溶解焓和混合焓。结果表明,NMP对1,4-戊二烯和异戊二烯的分离能力最佳。
The liquid-vapor equilibrium reactor was used to determine the vapor-liquid equilibrium of three ternary systems with the following four binary systems at 0, 12 and 22 ℃: ① 1,4-pentadiene (1) and isoprene (2) ; 1,4-pentadiene (1) and 2-methylbutene-2 (2); 1,3-pentadiene (1) and n-pentane 1) with acetonitrile (2); ⑤ 1,4-pentadiene (1) with isoprene (2) and acetonitrile And DMF (3); ⑦1,4-pentadiene (1) with isoprene (2) and NMP (3). The four binary system equilibrium data passed the thermodynamic consistency test. Associated with the Wilson equation binary data, vapor phase molar composition of the average deviation △ y <0.01, ternary system data are estimated △ y <0.02. The infinite dilution activity coefficients (z ~ ∞), relative volatility (α ~ ∞) and selectivity of 1,4-pentadiene at different temperatures in NMP, DMF and acetonitrile solvents were determined by gas- ∞), the enthalpy and enthalpy of 1,4-pentadiene in the above three solvents were obtained. The results showed that NMP had the best separation ability for 1,4-pentadiene and isoprene.