The acid-functionalized ionic liquid([HSO3Pmim]HSO4) was synthesized by a two-step method. Nuclear magnetic resonance(NMR) and Fourier transform infrared spectroscopy(FT-IR) show that the synthesis method is feasible ...The acid-functionalized ionic liquid([HSO3Pmim]HSO4) was synthesized by a two-step method. Nuclear magnetic resonance(NMR) and Fourier transform infrared spectroscopy(FT-IR) show that the synthesis method is feasible and high purity of ionic liquid can be obtained. Using [HSO3Pmim]HSO4as the catalyst, we studied the reaction kinetics of synthesizing sec-butyl alcohol from sec-butyl acetate and methanol by transesterification in a high-pressure batch reactor. The effects of temperature, initial molar ratio of methanol to ester, and catalyst concentration on the conversion of sec-butyl acetate were studied. Based on its possible reaction mechanism, a homogeneous kinetic model was established. The results show that the reaction heat ΔH is 10.94 × 103J·mol-1, so the reaction is an endothermic reaction. The activation energies Ea+and Ea-are 60.38 × 103 and 49.44 × 103J·mol-1,respectively.展开更多
Isobaric vapor-liquid equilibrium(VLE) data for acetic acid + sec-butyl acetate and water+acetic acid + sec-butyl acetate systems were determined at 101.3 kPa using a modified Rose type.The nonideality of the vapor ph...Isobaric vapor-liquid equilibrium(VLE) data for acetic acid + sec-butyl acetate and water+acetic acid + sec-butyl acetate systems were determined at 101.3 kPa using a modified Rose type.The nonideality of the vapor phase caused by the association of the acetic acid was corrected by the chemical theory and Hayden-O'Connell method.Thermodynamic consistency was tested for the binary VLE data.The experimental data were correlated successfully with the Non-Random Two Liquids(NRTL) model.The Root Mean Square Deviation(RMSD) of the ternary system was 0.0038.The saturation vapor pressure of sec-butyl acetate at 329 to 385 K was measured by means of two connected equilibrium cells.The vapor pressures of water and sec-butyl acetate were correlated with the Antoine equation.The binary interaction parameters and the ternary VLE data were obtained from this work.展开更多
建立了一种采用填充柱切割-反吹二维气相色谱分析汽油中酯类化合物（包括乙酸乙酯、乙酸仲丁酯、碳酸二甲酯）的方法。利用非极性填充预柱将汽油中沸点低于正辛烷的轻组分保留进入分析柱，重组分反吹放空，轻组分和酯类化合物经一个装...建立了一种采用填充柱切割-反吹二维气相色谱分析汽油中酯类化合物（包括乙酸乙酯、乙酸仲丁酯、碳酸二甲酯）的方法。利用非极性填充预柱将汽油中沸点低于正辛烷的轻组分保留进入分析柱，重组分反吹放空，轻组分和酯类化合物经一个装填有强极性固定相的色谱柱分离分析。采用外标法定量，3种酯类化合物在50~50000 mg / L 范围内线性关系良好，相关系数（r2）分别为0.99999、1.00000和0.99995，标准样品6次重复性测定的相对标准偏差（RSD）均小于1.0％，回收率在98.7％~107.9％之间，方法检出限（ S / N ＝3）为5 mg / L。该方法不需要进行样品前处理，具有操作简单，准确高效的特点，是汽油中酯类化合物测定的理想分析方法。展开更多
基金Supported by the New Century Excellent Talents in Fujian Province(JA12014)the Natural Science Foundation for Distinguished Young Scholars of Fujian(2014J06004)
文摘The acid-functionalized ionic liquid([HSO3Pmim]HSO4) was synthesized by a two-step method. Nuclear magnetic resonance(NMR) and Fourier transform infrared spectroscopy(FT-IR) show that the synthesis method is feasible and high purity of ionic liquid can be obtained. Using [HSO3Pmim]HSO4as the catalyst, we studied the reaction kinetics of synthesizing sec-butyl alcohol from sec-butyl acetate and methanol by transesterification in a high-pressure batch reactor. The effects of temperature, initial molar ratio of methanol to ester, and catalyst concentration on the conversion of sec-butyl acetate were studied. Based on its possible reaction mechanism, a homogeneous kinetic model was established. The results show that the reaction heat ΔH is 10.94 × 103J·mol-1, so the reaction is an endothermic reaction. The activation energies Ea+and Ea-are 60.38 × 103 and 49.44 × 103J·mol-1,respectively.
基金Supported by the National Natural Science Foundation of China （21176049） and the Natural Science Foundation of Fujian Province （2012J01034）.
文摘Isobaric vapor-liquid equilibrium(VLE) data for acetic acid + sec-butyl acetate and water+acetic acid + sec-butyl acetate systems were determined at 101.3 kPa using a modified Rose type.The nonideality of the vapor phase caused by the association of the acetic acid was corrected by the chemical theory and Hayden-O'Connell method.Thermodynamic consistency was tested for the binary VLE data.The experimental data were correlated successfully with the Non-Random Two Liquids(NRTL) model.The Root Mean Square Deviation(RMSD) of the ternary system was 0.0038.The saturation vapor pressure of sec-butyl acetate at 329 to 385 K was measured by means of two connected equilibrium cells.The vapor pressures of water and sec-butyl acetate were correlated with the Antoine equation.The binary interaction parameters and the ternary VLE data were obtained from this work.
文摘采用BC-DH2004催化剂进行仲丁醇脱氢合成甲乙酮的研究.考察不同催化体系的热稳定性,并考察催化剂的堆密度、助剂含量和仲丁醇的原料组成对BC-DH2004催化剂性能的影响及BC-DH2004催化剂多周期运行的稳定性.实验结果表明,BC-DH2004催化剂的热稳定性好;在反应温度250～270℃、液态空速4 h-1的条件下,仲丁醇脱氢产物中甲乙酮的质量分数大于80%,碳八酮的质量分数小于3%;具有适当的堆密度和助剂含量的催化剂性能较好;经再生后催化剂的性能稳定,操作周期大于1 250 h.
文摘建立了一种采用填充柱切割-反吹二维气相色谱分析汽油中酯类化合物（包括乙酸乙酯、乙酸仲丁酯、碳酸二甲酯）的方法。利用非极性填充预柱将汽油中沸点低于正辛烷的轻组分保留进入分析柱，重组分反吹放空，轻组分和酯类化合物经一个装填有强极性固定相的色谱柱分离分析。采用外标法定量，3种酯类化合物在50~50000 mg / L 范围内线性关系良好，相关系数（r2）分别为0.99999、1.00000和0.99995，标准样品6次重复性测定的相对标准偏差（RSD）均小于1.0％，回收率在98.7％~107.9％之间，方法检出限（ S / N ＝3）为5 mg / L。该方法不需要进行样品前处理，具有操作简单，准确高效的特点，是汽油中酯类化合物测定的理想分析方法。
