硫酸铁-硫酸配比对软锰矿氧化吸收H_2S的影响

研究了硫酸-硫酸铁酸性溶液氧化吸收硫化氢的工艺条件.采用廉价的天然原料,氧化吸收和铁盐再生同步完成,可以连续运行.工艺条件为:室温,0.5mol/L硫酸,1.0mol/L铁离子,硫化氢最大吸收率为99.2%.     

湿式氧化法脱除硫化氢的现状与发展

综述了湿式氧化法脱除生物气中硫化氢的发展及其各种方法的原理和特点。湿式氧化法包括3种典型工艺(砷基工艺、钒基工艺、铁基工艺)和新兴工艺,就目前研究过的湿式氧化法和其他新兴的方法来看,湿式络合铁法仍是一种有较大发展前途的方法。     

二氧化硫与硫化氢反应实验的创新设计

在人教版新课程教材化学必修1的教学中,常常会涉及硫及其化合物的相互转化。教师常常会利用二氧化硫与硫化氢反应,以证明二氧化硫具有氧化性,硫化氢具有还原性。但由于二氧化硫是主要的大气污染物,它能直接危害人体健康,会引起呼吸道     

臭氧生成和其性质综合实验

原理：当潮湿的白磷在空气中缓慢氧化时，可生成臭氧、磷酸和亚磷酸．臭氧化学反应活性很高，可将PbS氧化为PbSO。，把KI氧化而析出I。实验方法和现象：将新切开的白磷数小块置于盛有少量水和碎玻璃的试管底部，使白磷半面沉入水中，半面露在空气中，然后套入带有湿润的碘化钾试纸和用硫化氢熏黑的硝酸铅试纸的胶塞，盖紧．几分钟后，使有臭氧生成，碘化钾淀粉试纸显蓝色，用硫化氢熏黑的硝酸铅试纸，由黑色变白色．实验优点：操作简便，省时易行，内容新颖，把制法和性质的实验处于同一装置中进行，便于观察，是一个带有创新的综合性实…     

实验室新法制取硫化氢

FeS跟非氧化性酸作用，是实验室硫化氢的传统制法．也可用石蜡和硫费混合加热制取硫化氢，近来，我用植物油（花生油、茶油、莱子油等）和硫黄混合，微热也产生大量硫化氢．一．实验操作取一支15X150llllll试管，加人约2毫升花生油和1克硫黄粉，再加人一团棉纺，用玻璃棒拌匀．用铁夹把试管固定在铁架台上．用酒精灯给混合物微热，就产生大量硫化氢气体．停止加热，反应立即停止．用酒精灯再给混合物加热，硫化氢又产生，使用方便．二．实验装置图三．优点1．原料易找·2．使用方便·3．利于开展家庭小实验．实验室新法制取硫化氢@陆英麟$…     

氧化还原反应复习项目式教学设计与实践——以“池塘的消毒杀菌”为例

以养殖池塘的硫化氢污染处理为任务，通过氧化还原视角研究物质的转化，将生产生活问题转化为化学问题，在课堂中运用项目式教学，实现素养养成和知识学习的有机结合。     

2009年全国初中化学竞赛复赛试题第21、25、26题的解法

21题 硫化氢（H2S）是一种有毒的气体,工业上产生的硫化氢要经过处理,使其变成硫单质．富玛克斯法治理硫化氢的方法和步骤如下：     

碘量法测定脱硫液中硫化氢含量的优化

对脱硫液中的硫化氢进行测定时发现重复性无法满足现有碘量法中对重复性的方法要求。根据对脱硫液中硫化氢测定结果超差原因的分析,提出对碘量法的部分操作条件进行改进。用改进后的操作条件对脱硫液中的硫化氢进行测定,结果表明重复性全部满足方法优化后的要求。     

发酵时间对沼液四种有害物质的影响

目的:探索工厂化沼气发酵装置中的沼液,在不同发酵时间内的酚、挥发酸、亚硝酸盐和硫化氢含量的变化规律.方法:在沼气发酵装置中的发酵罐(样Ⅰ)、湿式沼气柜(样Ⅱ)、预沉淀池(样Ⅲ)和一体化氧化沟(样Ⅳ)四处采取沼液,分别于发酵的第0d、7d、14d、21d和28d,测定酚(羧甲基纤维素法)、挥发酸(氢氧化钠滴定法)、亚硝酸盐(α-萘胺法)和硫化氢(碘量法)含量.结果:各组沼液酚含量均随发酵时间的增加而降低;挥发酸含量随发酵时间的延长而增加,但均≦0.335g/L(28d);亚硝酸盐含量,样Ⅰ显著升高(p﹤0.05), 样Ⅱ有升高趋势,样Ⅲ和样Ⅳ有降低趋势,差异均不显著(p﹥0.05);硫化氢含量,样Ⅰ随发酵时间的延长而显著增加(p﹤0.05,p﹤0.01);样Ⅱ和样Ⅲ呈现升高趋势,但差异不显著(p﹥0.05);样Ⅳ硫化氢含量呈现下降趋势,但差异不显著(p﹥0.05).结论:在沼液发酵21-28d,选择样Ⅱ和样Ⅲ饲喂动物是安全的,不会引起酚、挥发酸、亚硝酸盐和硫化氢中毒.     

对阳离子定性分析方案的几点改进

华中师大等三校编写的分析化学实验教材从1982年使用至今已有五年了。该教材定性分析中阳离子系统分析是将原来五组硫化氢系统分析方案改为四组简易硫化氢系统分析方案。此方案比较简捷,便于初学者掌握,组与组之间的分离和组内离子间的分离都较干净;离子鉴定反应现象也明显,将硫化氢改为硫代乙酰胺(TAA)减少了对空气的污染和人体的毒害作用。如果今后在教学中增加 S~(2+)的鉴定采用五组硫化氢系统分析方案,而在具体分析步骤上仍使用简易硫化氢系统的某些方法,就一定能获得更佳效果。为此。我们据这几年实践的体     

无定型羟基氧化铁脱硫技术的研究与应用

金马洼38块是辽河油田最早开展硫化氢防治的区块,初期采用干法脱硫工艺,该工艺流程简洁、设备简单、操作方便,但应用以氧化铁为主要成分的脱硫药剂硫容较低,存在很多不足。针对此现状研究开发的无定型羟基氧化铁脱硫技术,是根据无定型羟基氧化铁的技术特点针对天然气、油田伴生气等含高硫气体中硫化氢脱除的一种新型脱硫方法,是一种反应活性好、硫容高、易再生并回收硫的脱硫材料。     

Personal Review： Sources of sulfide in waste streams and current biotechnologies for its removal

Sulfide-containing waste streams are generated by a number of industries. It is emitted into the environment as dis- solved sulfide (S2- and HS-) in wastewaters and as H2S in waste gases. Due to its corrosive nature, biological hydrogen sulfide removal processes are being investigated to overcome the chemical and disposal costs associated with existing chemically based removal processes. The nitrogen and sulfur metabolism interacts at various levels of the wastewater treatment process. Hence, the sulfur cycle offers possibilities to integrate nitrogen removal in the treatment process, which needs to be further optimized by appropriate design of the reactor configuration, optimization of performance parameters, retention of biomass and optimization of biomass growth. The present paper reviews the biotechnological advances to remove sulfides from various environments.     

Effects of loading rate and hydraulic residence time on anoxic sulfide biooxidation

The optimal operation conditions in an anoxic sulfide oxidizing (ASO) bioreactor were investigated. The maximal removal rates for sulfide and nitrate were found to be 4.18 kg/(m3·d) and 1.73 kg/(m3·d), respectively. The volumetrical volumetric loading rates (LRs) observed through decreasing hydraulic retention time (HRT) at fixed substrate concentration are higher than those by increasing substrate concentration at fixed HRT. The sulfide oxidation in ASO reactor was partially producing both sulfate and sulfur; but the amount of sulfate produced was approximately one third that of sulfur. The process was able to tolerate high sulfide concentration, as the sulfide removal percentage always remained near 99% when influent concentration was up to 580 mg/L. It tolerated relatively lower nitrate concentration because the removal percentage dropped to 85% when influent con- centration was increased above 110 mg/L. The process can tolerate shorter HRT but careful operation is needed. Nitrate conversion was more sensitive to HRT than sulfide conversion since the process performance deteriorated abruptly when HRT was decreased from 3.12 h to 2.88 h. In order to avoid nitrite accumulation in the reactor, the influent sulfide and nitrate concentrations should be kept at 280 mg/L and 67.5 mg/L respectively. Present biotechnology is useful for removing sulfides from sewers and crude oil.     

电导检测器离子色谱法测定水中硫化物

用Zn(Ac)2(乙酸锌)沉淀水中S2-(硫离子)抽滤除去水中其他杂质,使沉淀在碱性条件下被H2O2(过氧化氢)氧化成SO42-(硫酸根离子),用电导检测器离子色谱仪测定SO42-换算成S2-含量,检出限为0.02 mg/L(S2-),对ZnS(硫化锌)沉淀条件的选择,影响氧化ZnS的因素,空白及干扰问题进行了实验讨论。     

Occurrence of the Bunsen side reaction in the sulfur-iodine thermochemical cycle for hydrogen production

This study aimed to establish a closed-cycle operation technology with high thermal efficiency in the thermochemical sulfur-iodine cycle for large-scale hydrogen production. A series of experimental studies were performed to investigate the occurrence of side reactions in both the H₂SO₄ and HI _x phases from the H₂SO₄/HI/I₂/H₂O quaternary system within a constant temperature range of 323–363 K. The effects of iodine content, water content and reaction temperature on the side reactions were evaluated. The results showed that an increase in the reaction temperature promoted the side reactions. However, they were prevented as the iodine or water content increased. The occurrence of side reactions was faster in kinetics and more intense in the H₂SO₄ phase than in the HI _x phase. The sulfur or hydrogen sulfide formation reaction or the reverse Bunsen reaction was validated under certain conditions.     

Electrochemical detection of hydrogen peroxide at a waxed graphite electrode modified with platinum-decorated carbon nanotubes

Platinum-decorated carbon nanotubes(CNT-Pt) were produced by the chemical reduction method. A novel modified electrode was fabricated by intercalated CNT-Pt in the surface of waxed graphite,which provided excellent electrocatalytic activity and selectivity for both oxidation and reduction of hydrogen peroxide. The current response of the modified electrode for hydrogen peroxide was very rapid and the detection limits in amperometry are 2.5×10-6 mol/L at reduction potential and 4.8×10-6 mol/L at oxidation po...     

常见阳离子硫化氢系统分组与离子特性的关系

从离子的极化能力大小出发,讨论了离子极化能力对硫化物溶解度的影响及其与常见阳离子硫化氢系统分组法的关系。     

Multistage Extractive Reaction for Hydrogen Peroxide Production by Anthraquinone Process

The extractive reaction process of oxygen-working solution-water three-phase system for the production of hydrogen peroxide by the anthraquinone method was investigated in a sieve plate column of 50 mm in internal diameter. The oxidation reaction of anthrahydroquinone in the working solution with oxygen and the extraction of hydrogen peroxide from the working solution into aqueous phase occurred simultaneously in the countercurrent mode. The agitating effect caused by gaseous phase made the droplets of the dispersed phase become smaller, thus, increasing the liquid-liquid interfacial contact areas and resulting in the improvement of the mass transfer velocity. Results showed that the gas-agitation had a beneficial effect on the extraction of hydrogen peroxide from the working solution into the aqueous phase： the concentration of hydrogen peroxide in the raffinate decreased with the increase of the gaseous superficial velocities： and the concentration of H2O2 in the raffinate increased with the increase of the dispersed phase superficial velocity at the same superficial velocity of the gaseous phase. In the G-L-L extractive reaction process, with the increase of the gaseous superficial velocities, both the conversion of the anthrahydroquinone oxidation and the extraction efficiency of hydrogen peroxide first increased significantly, then increased gradually.     

直馏航煤吸附脱硫醇的试验研究（Ⅰ）——试验方法及吸附剂的选择

随着原油的含硫量增加,直馏航空煤油馏分中的硫醇硫随之增加,原有的精制工艺已出现或潜在许多问题,如硫醇硫含量超标、博士试验不合格等质量问题,需进一步发展完善以适应生产需要。直馏航煤精制脱硫醇的方法有加氢法．继化氧化法和吸附法等。文章在自主安装的试验装置,进行静态及动态吸附试验研究。通过静态吸附试验,在13种吸附剂中选定复合氧化锌作为吸附剂。在此基础上,考察了吸附剂结构形状对吸附精制效果的影响。试验结果表明,粉状吸附剂脱除硫醇硫质量百分率最高（98．1％）,粒状次之（34．9％）,条状最差（21．8％）;内扩散阻力是影响吸附过程的重要因素。