【摘要】：建立在常溫、常壓條件下準(zhǔn)確定量測(cè)定溶解乙炔含量的紫外-可見(jiàn)分光光度法,并對(duì)乙炔在丙酮、三乙二醇、N,N-二甲基甲酰胺和二甲基亞砜中的溶解特性進(jìn)行系統(tǒng)考察;采用循環(huán)伏安法研究助溶劑丙酮、三乙二醇、N,N-二甲基甲酰胺和二甲基亞砜對(duì)乙炔電化學(xué)氧化過(guò)程的影響以及綠色溶劑TEG對(duì)該過(guò)程影響的作用機(jī)制。實(shí)驗(yàn)結(jié)果表明在常溫、常壓條件下,溶解乙炔的含量可采用紫外-可見(jiàn)分光光度法通過(guò)紫紅色的乙炔銅進(jìn)行準(zhǔn)確測(cè)定,N,N-二甲基甲酰胺溶解乙炔的能力最強(qiáng);在乙炔電化學(xué)氧化過(guò)程中,水分子和三乙二醇之間強(qiáng)烈的氫鍵作用是提高乙炔在Na_2SO_4溶液中溶解度的決定性因素;在含體積分?jǐn)?shù)為9%TEG的0.5mol·L~(-1) Na_2SO_4溶液中,乙炔電化學(xué)氧化過(guò)程的表觀活化能為13.20kJ·mol~(-1),屬于受吸附控制的不可逆過(guò)程。該研究以期尋找一種乙炔的良好溶劑,為乙炔電化學(xué)氧化過(guò)程的研究、乙炔傳感器(尤其是乙炔的電化學(xué)傳感器)、綠色化學(xué)以及乙炔化工等的發(fā)展提供理論依據(jù)和實(shí)驗(yàn)指導(dǎo)。
[Abstract]:A UV-Vis spectrophotometry was established to determine the content of dissolved acetylene at room temperature and atmospheric pressure, and the dissolution characteristics of acetylene in acetone, triethylene glycol, N-dimethylformamide and dimethyl sulfoxide were systematically investigated. The effects of acetone, triethylene glycol, N-dimethylformamide and dimethyl sulfoxide on the electrochemical oxidation of acetylene were investigated by cyclic voltammetry and the mechanism of the effect of green solvent TEG on the process was studied. The experimental results show that the content of dissolved acetylene can be accurately determined by UV-Vis spectrophotometry at room temperature and atmospheric pressure, and the ability of dissolution of acetylene is strongest by NN- dimethylformamide. In the process of electrochemical oxidation of acetylene, the strong hydrogen bond between water molecule and triethylene glycol is the decisive factor to improve the solubility of acetylene in Na_2SO_4 solution. In 0.5mol L ~ (-1) Na_2SO_4 solution containing volume fraction of 9%TEG, the apparent activation energy of the electrochemical oxidation of acetylene is 13.20kJ mol~ (-1), which is an irreversible process controlled by adsorption. The purpose of this study is to find a good solvent for acetylene and to provide theoretical basis and experimental guidance for the study of acetylene electrochemical oxidation process, the development of acetylene sensor (especially acetylene electrochemical sensor), green chemistry and acetylene chemical industry.
【作者單位】： 太原理工大學(xué)化學(xué)化工學(xué)院;太原師范學(xué)院化學(xué)系;
【基金】：the National Natural Science Foundation of China and the Shenhua Group Corporation Limited(U1261103) the Open Fund of State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences(J12-13-913)
【分類號(hào)】：O623.124;O657.3

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