Na_2S溶液吸收低浓度SO_2的控制步骤分析

在一个半连续式反应器中采用硫化钠溶液吸收低浓度的SO2 气体 ,随着SO2 吸收量的增加 ,吸收液中pH值的变化出现两次突降 ,表现为三阶段模式。pH值第二次突降后的第三阶段吸收液失去完全吸收SO2 的能力。SO2 吸收的增强因子的变化范围为 :2 2 9 6 9× 10 -10 C-2H i 1 1× 10 -2 C-1H i- (6 9×10 -10 C-2H l 1 1× 10 -2 C-1H l)CSO2 lCSO2 i< <2 2 9 6 9× 10 -10 C-2H i 1 1× 10 -2 C-1H l,结合Gianni根据增强因子大小判断气体吸收的传质阻力控制步骤的分析 ,得出在本研究体系中 ,当吸收液pH >3 4 6时硫化钠溶液吸收低浓度的SO2 气体的过程为气侧传质阻力控制。这一结论正好与实验相符。     

低浓度SO2烟气脱硫技术分析

为控制大气SO2污染,各国科技人员先后开发了200多种烟气脱硫技术,比较常用的有石灰石－石膏法、催化氧化法、吸附法等。综合考虑经济和技术问题,比较适合我国的方法有：石灰作吸收剂的SDA系统、托普索湿法硫酸工艺、活性炭－磷铵法等。SDA脱硫渣可与磷石膏一起制水泥和硫酸。各企业应因地制宜,选用技术先进、经济合理、操作简单、可有效控制污染的脱硫工艺。     

溶液吸收法浓缩低浓度含氧煤层气

煤层气是一种优质能源,但目前我国煤层气利用率仅30%左右,主要受限于利用方式单一,煤层气提浓正在发展成一种新的重要利用方式。文章比较了目前的煤层气提浓技术,分析了其技术优势和缺点。为解决现有技术中存在的问题,本研究通过集成现有技术,提出溶液法吸收法分离低浓度煤层气的工艺,并具有安全性高,能耗及成本较低的优势。     

Na2S-SO2反应体系中H2S产生的过饱和态分析

向Na2S溶液中通入低浓度SO2气体以生成H2S，H2S从液相中逸出时，存在一突跃现象。本文根据这一现象，结合Y．T．Shah等提出的吸收－反应－解吸体系中过饱和态存在的条件，通过理论分析，得出在Na2S-SO2-H2S4反应体系中H2S解吸存在过饱和现象。     

热电锅炉烟气脱硫溶液中Na2S2O3含量的测定

“中成碱法回收热电锅炉烟气中的二氧化硫”是对国外Wellman-Lord烟气脱硫方法的改进，是我公司2004年新上的一项环保项目，用于处理公司热电站锅炉排放的烟气，以实现锅炉烟气达标排放，回收的产品二氧化硫作为生产保险粉的原料。此脱硫法脱硫液的成分很复杂，主要含NaHSO3、Na2SO3、Na2SO4和Na2S2O3。     

NO_X对Na_2S吸收低浓度SO_2烟气的影响

硫化钠溶液吸收-还原硫法是湿法烟气脱硫中具有良好应用前景的新方法。烟气中NOx与SO2往往同时存在,可能会对该工艺造成影响,为此,本文就NOx对该吸收液中S2-、HSO3-、S2O32-以及SO42-含量的影响进行了研究。结果表明,NOx不仅与吸收剂Na2S发生反应,造成吸收剂的消耗,还会对脱硫产物的种类和含量产生影响,并且NO2的浓度越高,对其影响越大。NO2的存在会促进SO42-的生成,并在酸性条件下抑制HSO3-和S2O32-的生成。     

Na2S2O3滴定法测定水泥中SO3

Ｎａ_２Ｓ_２Ｏ_３滴定法测定水泥中ＳＯ_３林育彤福建省三明市石棉瓦厂三龙粉磨站（３６５０００）通常用测定水泥中ＳＯ３含量来控制石膏的掺加量。传统的测定ＳＯ３方法有ＢａＳＯ４质量法、树脂交换法及碘量法。经过长期的实践、观察及对比，研究建立了Ｎａ２Ｓ２Ｏ３...     

高白度低残硫粘胶纤维的Na2S脱硫

以Na2S替代NaOH脱硫生产高白度,低残硫粘胶短纤维,纤维残硫大幅度降低,白度明显增高。介绍了Na2S母液的配制技术。     

脱硫溶液中Na2S203含量的快速准确测定

由于脱硫溶液中含有S^2-等还原性离子干扰Na2S2O3的测定，故在测定中需要寻找一种合适的方法来消除S^2-等还原性离子的干扰。对通常的3种测定Na2S2O3，含量的方法进行了试验取舍，并在此基础上摸索出了一种操作简便、快速，准确度高的测定脱硫溶液中Na2S2O3，含量的方法。     

脱硫溶液中Na2S2O3含量分析的探讨

脱硫溶液中的Na2S2O3是脱硫过程中的副产物，其含量的高低既是溶液脱硫能力的一种体现，也是操作工对脱硫溶液进行加料操作时的一个重要参考数据，所以，脱硫溶液中Na2S2O3含量分析很重要。由于脱硫溶液中含有S^2-等还原性离子干扰Na2S2O3的测定，故在测定中需要寻找一种合适的方法来消除S^2-等还原性离子的干扰。     

Kinetics of absorption of sulfur dioxide in dimethylaniline solution

Absorption of sulfur dioxide accompanied by reversible reaction in dimethylaniline has been studied using a short falling-film apparatus. Solutions of the amine in kerosene were used for this purpose. The effects of gas and liquid concentrations, contact time and temperature on the rate of absorption were investigated. Reaction equilibrium constant values were obtained at different temperatures from separate measurement of solubility of sulfur dioxide gas in kerosene as well as in dimethylaniline solutions. The heat of reaction was also calculated from these data. The absorption data could be satisfactorily interpreted by using the penetration theory of mass transfer with simultaneous pseudofirst order chemical reaction. The rate equations for the forward and reverse reactions were established.     

用氢氧化钠溶液吸收硫化氢制取硫化钠工业技术

详细阐述了在氯化钡生产过程中,将产生的硫化氢用氢氧化钠溶液吸收并制取硫化钠的生产工艺,分别从技术和经济的角度讨论其可行性：用380~420 g/L氢氧化钠溶液在填料塔中吸收硫化氢,反应终点控制硫化钠质量浓度为330~350 g/L,硫化氢吸收率达95%~98%。该工艺不仅可有效保护环境,而且可为企业创造效益。     

Removal of nitric oxide and sulfur dioxide from flue gases using a FeII-ethylenediamineteraacetate solution

The combined absorption of NO and SO₂ into the Fe(II)-ethylenediamineteraacetate(EDTA) solution has been realized. Activated carbon is used to catalyze the reduction of Fe^III-EDTA to Fe^II-EDTA to maintain the ability to remove NO with the Fe-EDTA solution. The reductant is the sulfite/bisulfite ions produced by SO₂ dissolved into the aqueous solution. Experiments have been performed to determine the effects of activated carbon of coconut shell, pH value, temperature of absorption and regeneration, O₂ partial pressure, sulfite/bisulfite and chloride concentration on the combined elimination of NO and SO₂ with Fe^II-EDTA solution coupled with the Fe^II-EDTA regeneration catalyzed by activated carbon. The experimental results indicate that NO removal efficiency increases with activated carbon mass. There is an optimum pH of 7.5 for this process. The NO removal efficiency increases with the liquid flow rate but it is not necessary to increase the liquid flow rate beyond 25 ml min^?1. The NO removal efficiency decreases with the absorption temperature as the temperature is over 35 °C. The Fe²⁺ regeneration rate may be speeded up with temperature. The NO removal efficiency decreases with O₂ partial pressure in the gas streams. The NO removal efficiency is enhanced with the sulfite/bisulfite concentration. Chloride does not affect the NO removal. Ca(OH)₂ and MgO slurries have little influence on NO removal. High NO and SO₂ removal efficiencies can be maintained at a high level for a long period of time with this heterogeneous catalytic process.     

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.     

钠石灰动态吸附CO2效能分析

为了深入研究钠石灰动态吸附CO2的规律特性,更好地将钠石灰用于地下工程空气环境保障工程实践,进行了钠石灰动态吸附CO2的测试实验,测得了钠石灰的最大吸附效率,通过控制不同的环境参数来探究环境因素对于钠石灰动态吸附CO2效率和吸附速率的影响,实验选取了温度和相对湿度两个变量因素,设置了4组不同的环境参数。通过实验可得出结论:相对湿度和温度对于钠石灰动态吸附CO2的效率和速率都有影响,并且呈正相关,其中相对湿度的影响要强于温度,在等温不等湿时的最大动态吸附效率差达到6%,最大平均吸附速率差达281 mL/min;钠石灰对CO2的动态吸附稳定,不易出现解吸附,适合用于地下工程中消除CO2。     

Kinetic study of hydrogen sulfide absorption in aqueous chlorine solution

Hydrogen sulfide (H₂S) is currently removed from gaseous effluents by chemical scrubbing using water. Chlorine is a top-grade oxidant, reacting with H₂S with a fast kinetic rate and enhancing its mass transfer rate. To design, optimize and scale-up scrubbers, knowledge of the reaction kinetics and mechanism is requested. This study investigates the H₂S oxidation rate by reactive absorption in a mechanically agitated gas–liquid reactor. Mass transfer (gas and liquid sides mass transfer coefficients) and hydrodynamic (interfacial area) performances of the gas–liquid reactor were measured using appropriated physical or chemical absorption methods. The accuracy of these parameters was checked by modeling the H₂S absorption in water without oxidant. A sensitivity analysis confirmed the robustness of the model. Finally, reactive absorption of H₂S in chlorine solution for acidic or circumneutral pH allowed to investigate the kinetics of reaction. The overall oxidation mechanism could be described assuming that H₂S is oxidized irreversibly by both hypochlorite anion ClO⁻ (k = 6.75 × 10⁶ L mol⁻¹ s⁻¹) and hypochlorous acid ClOH (k = 1.62 × 10⁵ L mol⁻¹ s⁻¹).