By using laser monitoring technique,the solubilities of p -toluic acid in N -methyl-2-pyrrolidone, N,N -dimethylformamide, N,N -dimethylacetamide,chloroform,acetic acid and water are measured in larger temperature int...By using laser monitoring technique,the solubilities of p -toluic acid in N -methyl-2-pyrrolidone, N,N -dimethylformamide, N,N -dimethylacetamide,chloroform,acetic acid and water are measured in larger temperature intervals by synthetic method.As to the solubility of p -toluic acid in water,the experimental and literature data have satisfactory consistency.Given the solubilities of p -toluic acid, a solubility model is proposed. This model is verified by experimental and literature data, and the solubilities calculated by the model show good agreement with experimental and literature data.展开更多
Micro-amount terephthalic acid and 4-carboxybenzaldehyde in p-toluic acids were determined by a reversed-phase ion suppression chromatography.The separation was carried out on a C18column（4.6mm i.d.×150mm）with ...Micro-amount terephthalic acid and 4-carboxybenzaldehyde in p-toluic acids were determined by a reversed-phase ion suppression chromatography.The separation was carried out on a C18column（4.6mm i.d.×150mm）with methanol-water（70∶30）as the mobile phase at a flow rate of 0.8ml/min and with H3PO4 as an inhibitor.The detection wavelength was 240 nm.The relative standard deviation of terephthalic acid and 4-carboxybenzaldehyde are less than 3% and 2%,respectively.The average recoveries were 102.9% and 103.2%,respectively.The detection limit were 0.25 ng and 0.45 ng,respectively.展开更多
利用羟胺酸BPHA(N 苯甲酰基 N 苯基羟胺)钴配合物Co(BPHA)2作催化剂,对对二甲苯液相氧化反应进行了研究.详细考察了反应温度、催化剂浓度、配体浓度、反应时间和轴配体对该催化反应的影响.实验结果表明:当反应温度为125℃、氧气压力为0....利用羟胺酸BPHA(N 苯甲酰基 N 苯基羟胺)钴配合物Co(BPHA)2作催化剂,对对二甲苯液相氧化反应进行了研究.详细考察了反应温度、催化剂浓度、配体浓度、反应时间和轴配体对该催化反应的影响.实验结果表明:当反应温度为125℃、氧气压力为0.5MPa、催化剂浓度为1.0×10-3mol/L、配体与催化剂的摩尔比为2∶1时、添加四甘醇或聚乙二醇作配体,反应2h时对二甲苯转化率可达41～43%、选择性为92%.本研究丰富了二甲苯选择性氧化的内容,并具有一定的工业应用前景.展开更多
文摘By using laser monitoring technique,the solubilities of p -toluic acid in N -methyl-2-pyrrolidone, N,N -dimethylformamide, N,N -dimethylacetamide,chloroform,acetic acid and water are measured in larger temperature intervals by synthetic method.As to the solubility of p -toluic acid in water,the experimental and literature data have satisfactory consistency.Given the solubilities of p -toluic acid, a solubility model is proposed. This model is verified by experimental and literature data, and the solubilities calculated by the model show good agreement with experimental and literature data.
文摘Micro-amount terephthalic acid and 4-carboxybenzaldehyde in p-toluic acids were determined by a reversed-phase ion suppression chromatography.The separation was carried out on a C18column（4.6mm i.d.×150mm）with methanol-water（70∶30）as the mobile phase at a flow rate of 0.8ml/min and with H3PO4 as an inhibitor.The detection wavelength was 240 nm.The relative standard deviation of terephthalic acid and 4-carboxybenzaldehyde are less than 3% and 2%,respectively.The average recoveries were 102.9% and 103.2%,respectively.The detection limit were 0.25 ng and 0.45 ng,respectively.
文摘利用羟胺酸BPHA(N 苯甲酰基 N 苯基羟胺)钴配合物Co(BPHA)2作催化剂,对对二甲苯液相氧化反应进行了研究.详细考察了反应温度、催化剂浓度、配体浓度、反应时间和轴配体对该催化反应的影响.实验结果表明:当反应温度为125℃、氧气压力为0.5MPa、催化剂浓度为1.0×10-3mol/L、配体与催化剂的摩尔比为2∶1时、添加四甘醇或聚乙二醇作配体,反应2h时对二甲苯转化率可达41～43%、选择性为92%.本研究丰富了二甲苯选择性氧化的内容,并具有一定的工业应用前景.
基金Supported by the National Basic Research Programof China(973 Program)(2003CB716003,2004CB719605)and the Knowledge Innovation Programof the Chinese Academy of Sciences(K2002A12).
