CIESC Journal ›› 2020, Vol. 71 ›› Issue (10): 4696-4703.doi: 10.11949/0438-1157.20191151

• Separation engineering • Previous Articles     Next Articles

Comparison of absorption efficiency of three hydrogen sulfide absorbents and optimization of absorption conditions of potassium iodate system

Xue LYU(),Yue MOU,Yiwen MIU,Hanlu LIAO,Jiansu RAN,Jie ZHENG()   

  1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
  • Received:2019-10-19 Revised:2019-11-18 Online:2020-10-05 Published:2019-12-02
  • Contact: Jie ZHENG E-mail:lvxue@cqu.edu.cn;zhengjie@cqu.edu.cn

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

CLC Number: 

  • TQ 125.1

Fig.1

Hydrogen sulfide absorbent absorption experiment device"

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)
10.31252
20.672406
3135510

Fig.2

Absorption efficiency of three hydrogen sulfide absorbents"

Fig.3

Absorption efficiency of potassium iodate with different concentration"

Fig.4

Absorption efficiency of potassium iodate system at different temperatures"

Fig.5

Absorption efficiency of different pH potassium iodate systems"

Fig.6

Absorption efficiency of potassium iodate system at different hydrogen sulfide flow rates"

Fig.7

Absorption efficiency of potassium iodate system under different absorption time"

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
1#吸收管2#吸收管3#吸收管
10.015.794.421.711.641.60
20.0312.535.251.381.251.22
30.0518.335.481.351.181.18
40.0621.395.831.191.141.13
50.0826.356.271.131.000.94

Table 3

Orthogonal test results of potassium iodate system"

实验号因素水平三级吸收效率/%
ABCD
11(0.3)1(1)1(26.5)1(1.93)51.26
212(2)2(40)2(6.01)52.27
313(3)3(55)3(10.11)50.12
42(0.67)12332.87
5223138.96
6231230.34
73(1)13245.36
8321330.10
9332122.83
k151.2143.1637.2337.68
k234.0640.4435.9942.65
k332.7634.4344.8137.70
极差R18.458.738.834.97
优化水平A1B1C3D2
因素影响顺序A>C>B>D
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