三种硫化氢吸收剂吸收效率对比及碘酸钾体系吸收条件优化研究

doi:10.11949/0438-1157.20191151

摘要/Abstract

摘要：

硫化氢具有腐蚀性与毒性，采用吸收剂吸收硫化氢气体是重要的脱硫处理方式。不同的吸收剂在吸收效率上存在较大差别。首先对比了三氯化铁体系、碘酸钾体系和碱性铁氰化钾体系三种不同硫化氢吸收剂的吸收效率。在此基础上重点优化了碘酸钾体系吸收条件参数，讨论了包含浓度、温度、pH、气体流量及时间等因素对硫化氢吸收效率的影响。并建立了四因素三水平正交试验研究较优吸收条件，得到正交试验优化吸收条件为：温度55℃，pH 6.01，硫化氢流量0.3 L·min^-1，吸收时间1 min，该条件下8%（质量）碘酸钾体系的三级吸收效率为51.56%。研究结果对硫化氢吸收处理提供了理论参考，也为间接电解法循环处理研究提供了支持。

关键词: 气体, 吸收, 优化, 硫化氢, 吸收效率, 碘酸钾

Abstract:

Hydrogen sulfide is corrosive and toxic, and the use of absorbents to absorb hydrogen sulfide gas is an important desulfurization treatment. The absorption efficiency of different absorbent is different. The absorption efficiency of three different hydrogen sulfide absorbent, namely ferric chloride system, potassium iodate system and alkaline potassium ferricyanide system, was firstly compared. Based on this, the absorption parameters of potassium iodate system were optimized, and the effects of concentration, temperature, pH, gas flow rate and time on the hydrogen sulfide gas absorption efficiency were discussed. The optimum absorption conditions were obtained by orthogonal test: temperature 55℃, pH 6.01, H₂S flow rate 0.3 L·min^-1, absorption time 1 min, the third-order absorption efficiency of 8%(mass) potassium iodate is 51.56%. The results of this study provide a theoretical reference for the absorption of hydrogen sulfide and support for the study of indirect electrolysis process.

Key words: gas, absorption, optimization, hydrogen sulfide, absorption efficiency, potassium iodate

中图分类号:

TQ 125.1

吕雪, 牟玥, 缪逸文, 廖寒露, 冉建速, 郑杰. 三种硫化氢吸收剂吸收效率对比及碘酸钾体系吸收条件优化研究[J]. 化工学报, 2020, 71(10): 4696-4703.

Xue LYU, Yue MOU, Yiwen MIU, Hanlu LIAO, Jiansu RAN, Jie ZHENG. Comparison of absorption efficiency of three hydrogen sulfide absorbents and optimization of absorption conditions of potassium iodate system[J]. CIESC Journal, 2020, 71(10): 4696-4703.

图/表 10

图1 硫化氢吸收剂吸收实验装置

Fig.1 Hydrogen sulfide absorbent absorption experiment device

表1 硫化氢吸收剂正交实验设计

Table 1 Orthogonal test design of hydrogen sulfide absorbent

水平

A(硫化氢流量)/

(L·min^-1)

B(吸收时间)/min

C(吸收

温度)/℃

D(体系pH)

0.3

0.67

图2 三种硫化氢吸收剂的吸收效率

Fig.2 Absorption efficiency of three hydrogen sulfide absorbents

图3 不同浓度碘酸钾体系的吸收效率

Fig.3 Absorption efficiency of potassium iodate with different concentration

图4 不同温度下碘酸钾体系的吸收效率

Fig.4 Absorption efficiency of potassium iodate system at different temperatures

图5 不同pH碘酸钾体系的吸收效率

Fig.5 Absorption efficiency of different pH potassium iodate systems

图6 不同硫化氢流量下碘酸钾体系的吸收效率

Fig.6 Absorption efficiency of potassium iodate system at different hydrogen sulfide flow rates

图7 不同吸收时间下碘酸钾体系的吸收效率

Fig.7 Absorption efficiency of potassium iodate system under different absorption time

表2 不同浓度碘酸钾体系吸收前后pH的变化

Table 2 Changes of pH before and after absorption in different concentrations of potassium iodate system

序号	碘酸钾质量浓度	三级吸收效率 η/%	反应前 pH	反应后pH
序号	碘酸钾质量浓度	三级吸收效率 η/%	反应前 pH	1^#吸收管	2^#吸收管	3^#吸收管
1	0.01	5.79	4.42	1.71	1.64	1.60
2	0.03	12.53	5.25	1.38	1.25	1.22
3	0.05	18.33	5.48	1.35	1.18	1.18
4	0.06	21.39	5.83	1.19	1.14	1.13
5	0.08	26.35	6.27	1.13	1.00	0.94

表3 碘酸钾体系正交实验结果

Table 3 Orthogonal test results of potassium iodate system

实验号	因素水平				三级吸收效率/%
实验号	A	B	C	D	三级吸收效率/%
1	1(0.3)	1（1)	1(26.5)	1(1.93)	51.26
2	1	2(2)	2(40)	2(6.01)	52.27
3	1	3(3)	3(55)	3(10.11）	50.12
4	2(0.67）	1	2	3	32.87
5	2	2	3	1	38.96
6	2	3	1	2	30.34
7	3（1）	1	3	2	45.36
8	3	2	1	3	30.10
9	3	3	2	1	22.83
k₁	51.21	43.16	37.23	37.68
k₂	34.06	40.44	35.99	42.65
k₃	32.76	34.43	44.81	37.70
极差R	18.45	8.73	8.83	4.97
优化水平	A1	B1	C3	D2
因素影响顺序	A>C>B>D

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