论文部分内容阅读
本文以煤油为稀释剂,研究HEH(EHP)从硫酸盐水溶液中萃取Cr(Ⅲ)的动力学过程。考察了铬离子浓度、萃取剂浓度、酸度、硫酸根浓度对萃取速率的影响。推断该过程的主要历程为: Cr(OH)_2~++(HA)_I?(Cr(OH)_2A)_I+H~+ (Cr(OH)_2A)_I+(H_2A_2)。?(CrA_3)。+2H_2O结合水解、络合等步骤,并考虑到检测结果是萃余水相铬离子的总浓度,即 [Cr(Ⅲ)]=[Cr~(3~+)]+(Cr(OH)~(2+)+[Cr(OH)_2~+]+[CrSO_4~+]采用稳态法导出其速率方程为 R=(k_1K_2[Cr(Ⅲ)][HA]_I[H_2A_2]。)/(k_(-1)[H~+]+k_2[H_2A_2]。)(1/β_1β_2)(H~+]~2+1/β_2[H~+]+1+a/β_1β_2[H~+][SO-4~(2-)]) -(k_(-1)k_(-2)[CrA_3]。[H~+]/(k_(-1)[H~+]+k_2[H_2A_2]。))
In this paper, kerosene as a diluent HEH (EHP) kinetics of Cr (Ⅲ) extraction from aqueous sulfate solution. The effects of chromium ion concentration, extractant concentration, acidity and sulfate concentration on the extraction rate were investigated. The main course of the process is inferred as follows: Cr (OH) _2 ~ + + (HA) _I? (Cr (OH) _2A) _I + H ~ + (Cr (OH) _2A) _I + (H_2A_2). ? (CrA_3). + 2H_2O combined with hydrolysis and complexation steps, taking into account that the test result is the total concentration of chromium ions in the raffinate aqueous phase, namely [Cr (Ⅲ)] = [Cr ~ (3 ~ +)] + (2) + [Cr (OH) _2 ~ +] + [CrSO_4 ~ +] using the steady state method, the rate equation is derived as R = (k_1K_2 [Cr (Ⅲ)] [HA] _I [H_2A_2] k H -1 + a + β 2 β H 2 + H 2 + H 2 + H 2 + H 2 + H 2 + H 2 + H 2 + H 2 + SO2- (2)] - (k1 - k2 - [CrA3]. [H ~ +] / (k_ (-1) [H ~ +] + k_2 [H2_2] )