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建立在常温、常压条件下准确定量测定溶解乙炔含量的紫外-可见分光光度法,并对乙炔在丙酮、三乙二醇、N,N-二甲基甲酰胺和二甲基亚砜中的溶解特性进行系统考察;采用循环伏安法研究助溶剂丙酮、三乙二醇、N,N-二甲基甲酰胺和二甲基亚砜对乙炔电化学氧化过程的影响以及绿色溶剂TEG对该过程影响的作用机制。实验结果表明在常温、常压条件下,溶解乙炔的含量可采用紫外-可见分光光度法通过紫红色的乙炔铜进行准确测定,N,N-二甲基甲酰胺溶解乙炔的能力最强;在乙炔电化学氧化过程中,水分子和三乙二醇之间强烈的氢键作用是提高乙炔在Na_2SO_4溶液中溶解度的决定性因素;在含体积分数为9%TEG的0.5mol·L~(-1) Na_2SO_4溶液中,乙炔电化学氧化过程的表观活化能为13.20kJ·mol~(-1),属于受吸附控制的不可逆过程。该研究以期寻找一种乙炔的良好溶剂,为乙炔电化学氧化过程的研究、乙炔传感器(尤其是乙炔的电化学传感器)、绿色化学以及乙炔化工等的发展提供理论依据和实验指导。
A UV-Vis spectrophotometric method was developed for the accurate and quantitative determination of dissolved acetylene at room temperature and atmospheric pressure. The effect of acetylene in acetone, triethylene glycol, N, N-dimethylformamide and dimethyl sulfoxide The effects of acetone, triethylene glycol, N, N-dimethylformamide and dimethyl sulfoxide on the electrochemical oxidation of acetylene were investigated by cyclic voltammetry and the effect of green solvent TEG The mechanism of action influence. The experimental results show that under normal temperature and atmospheric pressure, the content of dissolved acetylene can be accurately determined by UV-visible spectrophotometry with fuchsine acetylene copper. N, N-dimethylformamide has the strongest ability to dissolve acetylene; at During the electrochemical oxidation of acetylene, the strong hydrogen bonding between water and triethylene glycol is the decisive factor to improve the solubility of acetylene in Na_2SO_4 solution. When the content of 0.5mol·L -1 ) Na_2SO_4 solution, the apparent activation energy of electrochemical oxidation of acetylene is 13.20kJ · mol -1, belonging to the irreversible process controlled by adsorption. The research is looking for a good solvent for acetylene, providing theoretical basis and experimental guidance for the electrochemical oxidation process of acetylene, acetylene sensor (especially acetylene electrochemical sensor), green chemistry and acetylene chemical industry.