Triphenylpyridinium ylid 2, generated by the decarboxylation of betaine 1, were noted to react with acetyl chloride, chloroform or acetone to form addition-elimination product and proton extraction - carbanion additio...Triphenylpyridinium ylid 2, generated by the decarboxylation of betaine 1, were noted to react with acetyl chloride, chloroform or acetone to form addition-elimination product and proton extraction - carbanion addition products, respectively. The reaction with chloroform was determined as pseudo first order from kinetic experiments. The values of kobsd and t1/2 for decarboxylation at 20, 40 and 50C were calculated to be 4.6 x 10-4, 8.8 x 10-3, 2.8 x 10-2 min-1 and 1.5 x 103, 78, 24 minutes, respectively.展开更多
Solid complex Zn(Thr)SO 4·H 2O was prepared in a water acetone system. Under linearly increasing temperature, the non isothermal kinetics and the decomposition mechanism of Zn(Thr)SO 4·H 2O were studie...Solid complex Zn(Thr)SO 4·H 2O was prepared in a water acetone system. Under linearly increasing temperature, the non isothermal kinetics and the decomposition mechanism of Zn(Thr)SO 4·H 2O were studied by means of thermogravimetry and IR spectrometry. The thermal decomposition processes of the complex could be divided into three stages. The non isothermal decomposition mechanism and the kinetics parameters of the ligand lost process were obtained from an analysis to the TG DTG curves at various heating rates of 5 0, 10 0, 15 0 and 20 0 K/min by two integral and three differential methods. The results show that the random nucleation and the subsequent growth mechanism ( n =3/2) controlled the ligand lost process, the corresponding activation energy E and pre exponential constant A are 139 96 kJ/mol and 10 11 32 s -1 , respectively. The empirical kinetics model equation was constructed.展开更多
为考察较低温度(<17℃)条件下添加微量金属元素对厌氧发酵产气量的影响,在发酵底物TS(含固率)为10%下采用10 L玻璃瓶作反应器,以牛粪为原料,向厌氧生物反应器中分别添加MnSO4、FeSO4·7H2O、电解锰渣,分析了厌氧消化系统运行过...为考察较低温度(<17℃)条件下添加微量金属元素对厌氧发酵产气量的影响,在发酵底物TS(含固率)为10%下采用10 L玻璃瓶作反应器,以牛粪为原料,向厌氧生物反应器中分别添加MnSO4、FeSO4·7H2O、电解锰渣,分析了厌氧消化系统运行过程中的产气量、COD(化学需氧量)和pH的变化。结果表明,锰元素能促进低温下牛粪的厌氧发酵,加速反应启动。当添加6 g MnSO4、100 g电解锰渣时,单位质量VS产气率分别为0.26 mL/g和0.64 mL/g,添加6 g FeSO4·7H2O与空白对照组均未见明显产气。展开更多
基金the National Natural Science Foundation of China (No. 20272001)
文摘Triphenylpyridinium ylid 2, generated by the decarboxylation of betaine 1, were noted to react with acetyl chloride, chloroform or acetone to form addition-elimination product and proton extraction - carbanion addition products, respectively. The reaction with chloroform was determined as pseudo first order from kinetic experiments. The values of kobsd and t1/2 for decarboxylation at 20, 40 and 50C were calculated to be 4.6 x 10-4, 8.8 x 10-3, 2.8 x 10-2 min-1 and 1.5 x 103, 78, 24 minutes, respectively.
基金Supported by the National Natural Science Foundation of China(No.2 98710 32 and2 0 1710 36 ) and the EducationalSpecial Foundation of Shaanxi Province(No.0 1H0 8)
文摘Solid complex Zn(Thr)SO 4·H 2O was prepared in a water acetone system. Under linearly increasing temperature, the non isothermal kinetics and the decomposition mechanism of Zn(Thr)SO 4·H 2O were studied by means of thermogravimetry and IR spectrometry. The thermal decomposition processes of the complex could be divided into three stages. The non isothermal decomposition mechanism and the kinetics parameters of the ligand lost process were obtained from an analysis to the TG DTG curves at various heating rates of 5 0, 10 0, 15 0 and 20 0 K/min by two integral and three differential methods. The results show that the random nucleation and the subsequent growth mechanism ( n =3/2) controlled the ligand lost process, the corresponding activation energy E and pre exponential constant A are 139 96 kJ/mol and 10 11 32 s -1 , respectively. The empirical kinetics model equation was constructed.
文摘为考察较低温度(<17℃)条件下添加微量金属元素对厌氧发酵产气量的影响,在发酵底物TS(含固率)为10%下采用10 L玻璃瓶作反应器,以牛粪为原料,向厌氧生物反应器中分别添加MnSO4、FeSO4·7H2O、电解锰渣,分析了厌氧消化系统运行过程中的产气量、COD(化学需氧量)和pH的变化。结果表明,锰元素能促进低温下牛粪的厌氧发酵,加速反应启动。当添加6 g MnSO4、100 g电解锰渣时,单位质量VS产气率分别为0.26 mL/g和0.64 mL/g,添加6 g FeSO4·7H2O与空白对照组均未见明显产气。
