R115/NaX的吸附动力学及其因素显著性分析

doi:10.16183/j.cnki.jsjtu.2020.065

摘要/Abstract

摘要：

为了认识五氟一氯乙烷(R115)在NaX上的吸附动力学机理,以指导R115吸附脱除和催化转化等工业应用,分别利用准一级、准二级和内扩散模型研究R115浓度(指体积分数)和吸附剂粒径对R115吸附的影响.对比Thomas和Yan模型对穿透曲线的适用性,采用二水平三因子实验方法分析R115浓度、吸附剂质量和体积流速对吸附性能影响的显著性和相关性.研究结果显示,吸附过程主要受膜扩散控制;Yan和准一级吸附动力学模型对实验数据拟合度较高;吸附剂质量是最关键因素,显著影响穿透时间、饱和时间、吸附剂处理量和床层利用率;吸附剂质量和体积流速的交互作用对吸附剂处理量影响显著.

关键词: 五氟一氯乙烷, 吸附, 动力学, 穿透曲线, 实验设计

Abstract:

To understand the adsorption kinetic mechanism of chloropentafluoroethane (R115) on NaX and then to guide the industrial applications of R115 adsorption removal and catalytic conversion, the effect of R115 concentration (referring to volume fraction) and adsorbent particle size on adsorption performance are studied by using pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. The applicability of the Thomas model and Yan model for breakthrough curve analysis are compared. A two-level three-factor experimental method is implemented to evaluate the significance and possible correlations of R115 concentration, adsorbent mass, and flow rate on adsorption performance. The results indicate that the adsorption process is mainly controlled by R115 external film diffusion. The Yan model and the pseudo-first-order adsorption kinetic model fit the experimental data better. The adsorbent mass is the most important factor significantly affecting the breakthrough time, saturation time, volume of effluent treated per gram of adsorbate, and fractional bed utilization. The interaction of adsorbent mass and flow rate has a significant effect on the volume of effluent treated per gram of adsorbate.

Key words: chloropentafluoroethane, adsorption, kinetics, breakthrough curves, experimental design

中图分类号:

张金柯, 缪光武, 金佳敏, 陈银飞, 卢晗锋, 宁文生, 白占旗, 刘武灿. R115/NaX的吸附动力学及其因素显著性分析[J]. 上海交通大学学报, 2021, 55(9): 1071-1079.

ZHANG Jinke, MIAO Guangwu, JIN Jiamin, CHEN Yinfei, LU Hanfeng, NING Wensheng, BAI Zhanqi, LIU Wucan. Analysis of Factors and Significances of Adsorption Kinetics R115/NaX System[J]. Journal of Shanghai Jiao Tong University, 2021, 55(9): 1071-1079.

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变量	代号	水平
变量	代号	-1	0	1
φ₀×10⁶	X	400	500	600
m/g	Y	2	5	8
Q/(mL·min^-1)	Z	15	25	35

d_p/mm	φ₀×10⁶	第一部分线性		第二部分线性
d_p/mm	φ₀×10⁶	k_id/(mg·g^-1·h^-1/2)	R²	k_id/(mg·g^-1·h^-1/2)	I/(mg·g^-1)	R²
0.39	200	4.21	0.998	1.05	7.36	0.882
0.55	200	4.45	0.998	1.09	8.87	0.900
0.55	600	13.47	0.996	3.19	24.28	0.938
0.78	200	4.71	0.997	1.30	8.50	0.920
0.78	600	13.37	0.993	2.49	26.93	0.938
1.10	200	4.71	0.998	1.38	9.00	0.917

d_p/mm	φ₀ ×10⁶	准一级模型		准二级模型
d_p/mm	φ₀ ×10⁶	k₁/h^-1	R²	k₂×10³/(g·mg^-1·h^-1)	R²	h/(mg·g^-1·h^-1)
0.39	200	0.157	0.957	2.954	0.927	1.46
0.55	200	0.144	0.981	1.893	0.939	1.47
0.55	600	0.215	0.957	2.873	0.882	4.15
0.78	200	0.151	0.981	2.288	0.935	1.47
0.78	600	0.179	0.894	3.166	0.918	4.52
1.10	200	0.131	0.984	2.020	0.951	1.51

φ₀×10⁶	d_p/mm	q_e/(mg·g^-1)	Thomas 模型			Yan模型
φ₀×10⁶	d_p/mm	q_e/(mg·g^-1)	k_TH/(mL·min^-1·mg^-1)	q_TH/(mg·g^-1)	R²	q_Y/(mg·g^-1)	a_Y	R²
200	0.39	12.159	4.52	14.02	0.993	13.29	3.57	0.995
	0.55	14.358	3.69	16.46	0.992	15.56	3.41	0.995
	0.78	15.725	3.33	17.96	0.993	16.96	3.38	0.995
	1.10	16.624	2.96	18.87	0.990	17.65	3.15	0.995
600	0.55	38.038	1.79	44.50	0.997	43.07	4.47	0.995
	0.78	37.821	1.79	44.26	0.996	42.82	4.47	0.994

φ₀ ×10⁶	m/g	Q/(mL·min^-1)	t_b/h		t_s/h		V_s/(L·g^-1)		ζ
φ₀ ×10⁶	m/g	Q/(mL·min^-1)	实验值	预测值	实验值	预测值	实验值	预测值	实验值	预测值
600	2	15	6.37	7.42	125.78	124.71	56.60	56.82	0.11540	0.11370
400	2	15	5.22	4.18	124.68	125.75	56.11	55.89	0.09786	0.09957
600	8	15	60.42	59.38	217.33	218.40	24.45	24.23	0.36670	0.36830
400	8	15	51.18	52.23	242.13	241.06	27.24	27.47	0.32090	0.31920
600	2	35	4.00	2.96	27.33	28.40	28.70	28.48	0.22100	0.22270
400	2	35	2.85	3.90	26.67	25.60	28.00	28.23	0.21570	0.21390
600	8	35	38.88	39.93	99.33	98.26	26.07	26.30	0.50860	0.50690
400	8	35	38.00	37.00	116.00	117.07	30.45	30.23	0.46140	0.46310
500	5	25	25.60	26.07	122.00	122.20	34.97	34.85	0.28716	0.24890
500	5	25	25.71	25.81	122.19	122.24	34.65	34.74	0.28794	0.25430
500	5	25	26.30	25.76	122.54	122.80	34.51	34.54	0.29022	0.25430
	平均值		25.87	25.88	122.41	122.41	34.70	34.71	0.28844	0.25250
	R²		0.9978		0.9998		0.9997		0.9999