超声波作用下柠檬酸盐溶液中SO2的解吸机理

本文从超声波作用特点出发,利用数值计算研究了在超声解吸SO2过程中,超声波的作用机理,从理论上阐明了影响超声解吸SO2的主要因素,并对此进行了实验验证,实验结果与理论分析吻合较好。研究表明,超声场下脱除柠檬酸盐溶液中SO2在理论和实验室规模下是可行的;超声频率、溶液中气体含量以及溶液性质对超声解吸SO2影响较大;给溶液中增加空化气泡核如通入微量惰性气体,SO2解吸效率显著提高;超声频率越低,超声脱除SO2效果越好;给溶液施加适当搅拌,SO2解吸率提高20%～30%;溶液中SO2初始浓度越高,解吸效果越好。     

添加剂对超声解吸柠檬酸盐溶液中SO2的影响

将超声波作为外场引入柠檬酸钠缓冲溶液中脱除SO2的过程是一项新的尝试. 本工作从超声波作用特点及溶液性质出发,探讨了超声解吸柠檬酸钠溶液中SO2的机理以及添加剂(表面活性剂和惰性气体)对解吸过程的影响,并通过实验研究进行了对比性验证. 结果表明,十二烷基硫酸钠、十二烷基苯磺酸钠和十二烷基三甲基氯化铵均能显著降低柠檬酸钠溶液的表面张力,添加表面活性剂对超声解吸SO2具有一定的促进作用,其中十二烷基硫酸钠的效果较好;当表面活性剂浓度大于0.1 g/L时,溶液表面张力几乎不变,SO2解吸率增加缓慢;在解吸体系中通入少量的惰性气体也能提高超声解吸SO2的效率,解吸率比无惰性气体存在时提高20%.     

哌嗪有机胺脱硫液解吸技术研究

采用加热方法解吸哌嗪有机胺脱硫富液中的二氧化硫,研究解吸时间、解吸温度、气相流量、添加硫酸浓度对解吸率、解吸液剩余SO32-浓度的影响.实验结果表明:解吸时间越长、解吸温度越高、气相流量越大、硫酸浓度越高,解吸率越高,解吸液剩余SO32-浓度越低.解吸过程的最佳工艺条件为:解吸时间100 min,解吸温度90℃,解吸气...     

添加酸对HPP-SO_2水溶液热解吸的影响

研究了添加不同酸对HPP-SO2吸收液加热解吸SO2的影响。结果表明,添加酸可提高SO2的解吸率和解吸速率,解吸率随酸添加量增大而提高。吸收液pH值6.20时,解吸率的大小为:硫酸草酸磷酸乙酸柠檬酸己二酸;吸收液pH值5.00时,解吸率的大小为:磷酸硫酸草酸柠檬酸乙酸己二酸。HPP-硫酸溶液中添加磷酸,溶液pH值4.80时,可进一步提高SO2热解吸效果。     

烟气膜吸收法脱除SO2的超声波强化处理

本文提出了以柠檬酸盐溶液为吸收剂、中空纤维膜组件为脱除SO₂的基本设备,并配有超声波强化吸收的技术模式,首次将超声波和膜技术应用于烟气脱硫过程。重点探讨了超声空化作用及其促进传质过程的机理,利用自主设计的超声膜吸收器进行了烟气脱硫研究,同时分析了超声对吸收液和中空纤维稳定性的影响。研究结果表明：在超声频率为20kHz,柠檬酸盐溶液浓度为0.5mol•L^-1, pH值为4.5的条件下,超声波对膜吸收SO₂有明显的促进作用,对吸收液温度有加热的副作用,同时超声波的加入对吸收液和膜材料的稳定性没有影响。     

旋转填料床/柠檬酸盐法脱除烟气中SO2的实验研究

提出采用旋转填料床结合柠檬酸盐法脱除烟气中SO2的方法,考察了旋转填料床转子转数、液气比、pH值等因素对脱硫率的影响.结果表明采用超重力法柠檬酸盐溶液初始浓度为1.5mol/L、液气比为71/m3、超重机转子转速为1000r/min,吸收液的pH值为5.0,脱硫率达到98％以上.     

填料塔中柠檬酸盐溶液脱除低质量浓度SO2的特性

研究了用柠檬酸盐溶液在波纹填料塔中吸收高氧含量烟气中低质量浓度SO2的特性,重点考察了柠檬酸浓度、溶液的pH、烟气流量对吸收效果的影响,确定出溶液中SO2质量浓度与烟气中SO2脱除率的关系,测定出吸收溶液中亚硫酸根的氧化速率,证实了溶液中硫酸根的质量浓度基本呈线性增加,增加的速率约为0.2g/(L·h)。     

二乙烯三胺-柠檬酸溶液吸收SO_2过程

以二乙烯三胺为吸收剂,柠檬酸为添加剂,考察了二乙烯三胺-柠檬酸吸收/解吸SO_2工艺过程。结果表明,二乙烯三胺-柠檬酸吸收/解吸SO_2合适的条件为二乙烯三胺浓度0.2 mol/L,二乙烯三胺与柠檬酸物质的量之比1:1,吸收液pH值5.40,吸收温度40℃,解吸温度102℃。在该条件下,SO_2的吸收量为2.65 mol/mol,对应的SO_3~(2-)氧化率为2.52%,SO_2的解吸率为90.57%,对应的SO_3~(2-)-氧化率为3.77%。根据二乙烯三胺-柠檬酸吸收/解吸SO_2工艺过程,分析了吸收/解吸过程机理,并建立吸收平衡常数表达式。     

超声波降解水中硝基苯研究

通过超声波、超声-H2O2、超声一Fealmon 试剂降解含硝基苯废水的试验,探讨了频率、声强、H2O2的投加量以及Fonton反应的最佳pH值等对硝基苯降解效果的影响.试验结果表明：当硝基苯浓度为 367 mg/L、频率为 40 kHz时、作用时间为 6 min,用超声波单独处理,硝基苯去除率效果只有30%;采用超声-H2O2联合技术可使硝基苯降解率明显提高,硝基苯降解率为62%;超声-Feaaton试剂处理效果最佳,在相同处理条件下,当pH=3时,硝基苯的降解率可达到86%.     

聚丙烯酸四甲基胍的制备及其吸收-解吸二氧化硫

通过自由基溶液聚合制备了聚丙烯酸,使其与1,1,3,3-四甲基胍中和反应制得聚丙烯酸四甲基胍(PTMGA),利用模拟的工业装置,研究了PTMGA水溶液在不同温度和烟气条件下吸收-解吸SO2的性能. 结果表明,PTMGA水溶液对SO2具有较好的吸收-解吸性能及选择吸收性能. 当吸收温度40℃、烟气中SO2浓度2%或4%(j)时,PTMGA水溶液吸收SO2效率大于97%,解吸效率大于40%,且低温利于吸收,高温利于解吸.     

超声波解吸柠檬酸盐溶液中二氧化硫的研究

Using a sonochemical reactor designed by the authors,the process of removing sulfur dioxide from cit- rate solution simulating the flue gas desulfurization was studied.The influence of ultrasonic frequency,ultrasonic power,reaction temperature,stirring speed,inert gases,initial concentration of sulfur dioxide and concentration of citrate on the efficiency of sulfur dioxide desorption,the stability of citrate solution and the concentration of sulfate radical was examined systematically.By comparing the desorption of sulfur dioxide with and without ultrasonifica- tion,it was concluded that(1)lower ultrasonic frequency results in a better degassing efficiency;(2)the use of ul- trasonification in desorbing sulfur dioxide from citrate solution improves the desorbing efficiency in some condi- tions,without changing the essence of chemical reactions;(3)sparging inert gas into the liquid can lower the vis- cosity of solution and the cavitating threshold,and raise the desorption efficiency.These results demonstrate a technical way for deep desorption of sulfur dioxide and provide the fundamental data for future industrial disposal of sulfur dioxide.     

Theoretical Study on Sulfur Dioxide Absorption with Citrate Solution

The citrate absorption of SO2 is currently one of the most successful and economic methods to harness sulfur dioxide pollution. In order to theoretically elucidate the mechanism of SO2 absorption by citrate solution and provide theoretical instruction for experiments and industrial process, the theory of multi-buffer solution, combined with computer numerical calculation methods, was applied to study the distribution parameters of the components of the citrate solution in the process of SO2 absorption and the following results were obtained: (1) HCi2- and H2Ci- in the citrate solution played the dominant role in the absorption and desorption processes; (2) Through the calculation for the buffer capacity of citrate solution, it was found that the pH of the absorption and desorption solution should be in the range of 2~8, while at pH=4.5 the buffer capacity reached its maximum. Some valuable parameters were obtained, which are instructive to the ensuing experiments and industrial design.     

高效填料塔中用柠檬酸/柠檬酸钠溶液进行烟气脱硫的研究

以柠檬酸 柠檬酸钠溶液为缓冲液在高效规整填料塔中进行烟气脱硫。模拟的烟气首先在吸收塔中用柠檬酸钠溶液脱硫 ,然后富液在解吸塔中释放出SO2 ,再生的缓冲液返回吸收塔循环使用。研究了影响吸收及解吸效率的各种重要参数 ,确定了最佳操作条件。对解决SO2 污染问题提供了应用基础     

超重力旋转填料床中柠檬酸钠缓冲液吸收二氧化硫(英文)

Absorption of SO2 from a SO2/air mixture with sodium citrate buffer solution was investigated using a rotating packed bed(RPB) in laboratory scale.The effects of operating parameters,such as the rotation speed of RPB,liquid-gas ratio,inlet gas flow rate,inlet concentration of SO2 in flue gas,sodium citrate buffer concentration and initial pH of absorption solution,on the SO2 concentration in the absorption solution or removal efficiency of SO2 were examined.Incremental rate of sulfate radical ions in the absorption solution was also examined.Experimental results indicate that the efficiency of this regenerative process will be improved by using RPB under appropriate operating conditions,and the generation of SO2-4 will be restrained in the process in RPB.     

Absorption of Low Concentration Sulfur Dioxide Using Liquid-containing Microporous Membrane

The absorption of low concentration SO2 in flue gas by using the module of liquid-containing microporous membrane which is made up of hollow fiber and citric acid-sodium citrate buffer solution was investigated. The absorption efficiency of hydrophilic and hydrophobic membranes by using the concept of dynamic contact angle was mainly studied. The influences on absorption efficiency from absorption time, flowrate of gas phase, SO2 concentration of gas phase, air pressure, citrate concentration, pH value of solution as well as the generation of sulfate radical in absorption solution were examined. The results indicate that the hydrophobic hollow fiber membrane is better than hydrophilic membrane, the absorption efficiency decreases with increasing absorption time, gas phase flowrate, gas phase SO2 concentration and air pressure, the absorption rate and capacity of SO2 can be improved by increasing the citrate concentration, the absorption efficiency can be improved by increasing the pH value of citrate solution, the concentration of SO42- in absorption solution increases linearly with the absorption time at a rate around 0.192 g/(L×h).     

Fe2+液相催化氧化脱除烟气中SO2

提出了一种烟气脱硫新工艺。实验选用水作脱硫剂 ,在只以Fe为催化剂的条件下进行。加入吸收液槽中的铁屑可与脱硫产生的稀硫酸进行反应 ,不仅可维持较高的吸收液pH值 ,而且产生的Fe2 + 引发了液相催化氧化SO2 反应。连续运行实验结果表明脱硫过程在不同阶段分别受SO2 溶解、Fe2 + 液相催化氧化SO2 反应、气相中SO2 扩散和铁屑与酸反应控制。吸收液中Fe2 + 质量浓度的变化和初始Fe2 + 质量浓度对脱硫率及吸收液pH值影响显示 ,可直接由清水制取高浓度硫酸亚铁溶液。实验还调查了SO2 入口质量浓度、液气比、空塔气速和吸收温度对脱硫率和吸收液pH值的影响     

共聚焦拉曼光谱研究Mg2+和SO42-缔合平衡作用

硫酸镁溶液是一种应用很广的电解质溶液,Mg2+和SO42-缔合平衡的特征与规律一直是人们关注的热点,具有重要的现实意义。本文利用拉曼光谱法并结合高斯-洛伦兹去卷积分峰拟合程序分析了不同浓度的MgSO4溶液在不同温度下Mg2+和SO42-缔合结构特征,计算了其缔合平衡常数KR值,并对标准状态下Mg2+与SO42?离子缔合反应及其生成的接触式离子对CIP′的表观热力学参数进行了推测计算。实验结果表明：MgSO4溶液中SO42－浓度与ν1-SO42?特征峰的峰面积和峰强度之间均存在较好的线性相关关系。自由态SO42?是ν1-SO42?特征峰的主要结构。随着溶液温度的升高,1.5和2.0mol/LMgSO4溶液ν1-SO42?特征峰的峰面积和峰强度有减小的趋势,峰位发生红移,峰的对称性发生变化,其中自由态SO42?结构比例呈下降趋势,而单齿接触式离子对结构比例相应增加,双齿接触式离子对和SO42?离子团簇结构比例变化规律不明显。Mg2+和SO42-的缔合平衡随温度升高向右移动,KR值逐渐增大。在较稀MgSO4溶液中,几乎没有双齿接触式离子对和SO42?离子团簇结构,ν1-SO42?特征峰缔合结构及KR值随温度变化没有明显规律。相同温度条件下,KR值随MgSO4溶液浓度的升高呈现指数降低的趋势。