含碘废液回收碘的研究

报道了用硫酸铜及硫代硫酸钠从含碘废液中提取碘的工艺，碘的回收率＞９２％，纯度＞９９．５％，铜的回收率可达９７．５％。     

含碘废液回收碘的研究

报道了用硫酸铜及硫代硫酸钠从含碘废注入中提取碘的工艺，碘的回收率＞９２％，纯度＞９９．５％，铜的回收率可达９７．５％。     

提高脱硫液中硫化氢测定结果重复性

活测定脱硫液中溶解硫化氢含量采用方法Q/SY LS 1503-2009《脱硫液中溶解硫化氢含量的测定(碘量法)》。碘量法的原理是根据脱硫剂吸收硫化氢后会生成相应的盐类,在弱酸性介质中,硫(S2-)被碘(I2)氧化;而过剩的碘用硫代硫酸钠滴定。其反应式如下:S~(2-)+2I_2(过量)→S+2I~-+I_2(剩余)I_2+2Na_2S_2O_3→NaI+Na_2S_4O_6,分析方法Q/SY LS 1503-2009《脱硫液中溶解硫化氢含量的测定(碘量法)》中要求:当硫化氢含量3000mg/L时,同一样品重复测定两个结果之差应≦500mg/L。但在实际分析工程中,经常无法满足这一要求。因此本文进行了研究分析。     

磷酸生产过程中碘的检测与回收初探

本文对贵州瓮福磷矿磷酸生产过程中碘的检测与回收做了初步探索。制备了碘离子选择性电极，并参照国家标准《磷矿石和磷精矿中碘含量的测定》（GB／T1878-1995）中所规定的离子选择性电极法测定磷精矿和磷石膏中碘的含量；采用紫外可见分光光度法检测磷酸中的碘含量；通过质量衡算计算废气中的含碘量。最终得到磷酸生产过程中碘的分配比为：磷酸中35．2％、磷石膏中17．9％、废气中46．9％。采用硫代硫酸钠的稀碱溶液吸收废气中的碘，并对铜盐沉淀法回收碘进行了初步研究，该法工艺简单，经济效益好。     

4-羟基-3-碘-5-硝基苯甲腈的新合成方法

报道了以对羟基苯甲醛为原料，经过硝化、腈化和碘化反应合成牛羊抗肝片吸虫药4-羟基-3-碘-5-硝基苯甲腈的新方法，总收率为76．9％，纯度达96．8％。     

4-叔丁基碘苯的合成研究

采用叔丁基苯和4-叔丁基苯甲酸两种方法合成对4-叔丁基碘苯,产率分别达到42．1％和29．4％。研究表明,叔丁基苯方法比4-叔丁基苯甲酸方法简单易行、成本低。     

制造硫代硫酸钠新法

制造硫代硫酸钠(俗名大苏打)的方法,几乎都利用硫或硫化物,有时亦利用二氧化硫。最近在苏联发明一种利用硫化氢以制造硫代硫酸钠的方法,这里的硫化氢是一种副产物,可以说是废物利用。其反应如下: 2Na_2SO_3+2NaHSO_3+2H_2S→3Na_2S_2O_3+3H_2O 此法之最大优点,为利用副产之硫化氢及含有二氧化硫之接触系中放出的废气。最适宜之反应温度为摄氏二○至四○度。如果温度增高,则硫代硫酸钠     

5-氨基-3-巯基-1,2,4-三氮唑的合成工艺研究

以水合肼和硫氰酸铵为原料合成2,5-联二硫脲,在碱性条件下脱硫化氢环化制得5-氨基-3-巯基-1,2,4-三氮唑。研究了环化过程中原料配比、反应温度、反应时间对收率的影响,得到较佳的工艺条件：2,5-联二硫脲与NaOH的摩尔比为1：5,反应时间为5h,反应温度125℃,在此工艺条件下,产品收率达到85．5％以上。     

硫代乙酰胺用于络量法测定硫化物的方法研究

一、前言目前,工业上测定硫化物,普遍采用碘量法。因该法中所用硫代硫酸钠和碘标准溶液不稳定,需要经常标定,特别是碘易挥发,测得数据波动性较大,因而在方法上有进一步研究改进的必要。关于不用碘量法测定气液相中硫化氢的方法,文献中早有报道,且只限于硫化钠一种。因其易被空气和溶液中的氧所氧化,溶液中硫离子的准确浓度必须不断的标定,手续繁琐,颇费时间,且数据重现     

影响水合肼分析误差的原因分析

应用碘量法分析水合肼时,碘溶液一般用硫代硫酸钠标准溶液标定,实际操作中发现,配制硫代硫酸钠溶液时不能加入碳酸钠,否则会影响标定碘溶液浓度,从而影响水合肼的测定结果.     

Chloramine T with iodine: A new reagent to determine the iodine value of edible oils

Chloramine T (N-chloro-p-toluenesulfonamide sodium salt) and iodine (2:1, w/w) in carbon tetrachloride and acetic acid (1:1, vol/vol), referred to as reagent (I) was found to be effective for the determination of Iodine value of edible oils. Reagent (I) reacted quantitatively with the double bonds of oils of known weight. The reagent left unreacted after 20–25 min was titrated against standard sodium thiosulfate solution (0.04 M) in presence of potassium iodide (10%, 5 mL). The difference in volume of sodium thiosulfate solution consumed by reagent (I) without and with oil was a basis to calculate the iodine value of oils used. The iodine values of different oils were also determined separately following the standard procedure of Wijs, and calculated iodine value was obtained from the gas chromatographic profile of fatty acids. The iodine value obtained by the new method was in agreement with the results of the standard methods. The results obtained indicate that the method could be a complementary or an alternative to the Wijs method.     

Chloramine T with iodine: A new reagent to determine the iodine value fo edible oils

Chloramine T (N-chloro-p-toluenesulfonamide sodium salt) and iodine (2:1, w/w) in carbon tetrachloride and acetic acid (1:1, vol/vol), referred to as reagent (I) was found to be effective for the determination of Iodine value of edible oils. Reagent (I) reacted quantitatively with the double bonds of oils of known weight. The reagent left unreacted after 20–25 min was titrated against standard sodium thiosulfate solution (0.04 M) in presence of potassium iodide (10%, 5 mL). The difference in volume of sodium thiosulfate solution consumed by reagent (I) without and with oil was a basis to calculate the iodine value of oils used. The iodine values of different oils were also determined separately following the standard procedure of Wijs, and calculated iodine value was obtained from the gas chromatographic profile of fatty acids. The iodine value obtained by the new method was in agreement with the results of the standard methods. The results obtained indicate that the method could be a complementary or an alternative to the Wijs method.     

Graft copolymerization to cellulose. Effect of sodium thiosulfate on hydrogen peroxide initiator system

The effect of sodium thiosulfate on the graft copolymerization of methyl methacrylate to cellulose in the hydrogen peroxide initiator system was investigated. The addition of sodium thiosulfate in general was effective for decreasing the per cent grafting and the average molecular weight of grafts and increasing the formation of homopolymer, and the effects became pronounced with increasing hydrogen peroxide concentration. Moreover, the addition of sodium thiosulfate slightly suppressed the formation of grafts at a hydrogen peroxide concentration of 3 mmole/l., but greatly promoted it at 20 mmole/l. Traces of metallic ions present in cellulose could not be eliminated sufficiently by treatment with 3N hydrochloric acid. Such ions were found to interact with hydrogen peroxide and thus participate directly in the initiation and termination of the polymerization reaction. EDTA, the chelating agent, was highly effective for suppressing such participation of metallic ions. In the hydrogen peroxide initiator system applied to the EDTA-treated samples, sodium thiosulfate caused an effective initiation of graft formation.     

过氧化二异丙苯含量测定方法的研究

过氧化二异丙苯(DCP)是强氧化剂,用其强氧化性质将饱和碘化钾溶液中的碘离子还原为碘,在样品中加入碳酸氢钠和浓盐酸,在低温(65℃)条件下使碳酸氢钠和浓盐酸反应生成二氧化碳形成保护气体,防止碘升华与空气中的氧反应而造成测定误差,在酸性条件下以淀粉作指示剂,用硫代硫酸钠标准溶液滴定反应生成的碘,以此方法测定过氧化二异丙苯(DCP)的含量,在实际工作中可操作性较强、精密度和准确度高、方法操作简单且重现性较好、抗干扰能力强,完全能够满足容量分析方法中规定的2个平行测定结果误差不大于0.2%的要求。     

Potassium iodate–initiated polymerization of aniline

Potassium iodate–initiated polymerization of aniline was carried out in an acidified aqueous medium in the presence and in the absence of sodium thiosulfate salt. The nature of the polyaniline (PANI) produced depended on the aniline/potassium iodate (A/PI) mole ratio. Green emeraldine salt (ES) and blue pernigraniline salt (PS) were produced at A/PI mole ratios greater than 2 and less than 2, respectively. The sodium thiosulfate salt played a significant role in the purification and properties of PANI. The optimum aniline‐to‐oxidant mole ratio was found to be 2 : 1. Spectral, thermal, and electrical characteristics and viscosity of the materials were studied and compared with the results. A reaction scheme has been proposed to elucidate the role of iodine(V). Sodium thiosulfate makes it easier for iodine to be separated from a system and increases the conductivity of the products. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1626–1631, 2007     

氢化腈类橡胶(HNBR)中的残余不饱和度碘值法分析

将氢化腈类橡胶( HNBR) HNBR试样溶于氯仿中,加入过量的Wijs’试剂后,静置适当的时间(2 h)使其与HNBR中的残留不饱和物反应完全.然后用碘化钾还原过量的Wijs’试剂,最后用硫代硫酸钠标准滴定溶液滴定溶液中的游离碘,计算碘值(不饱和度).     

A new rapid titration method for determining the halogen ratio of Wijs solution and of iodine monochloride

The free iodine in Wijs solution is titrated directly, in strong hydrochloric acid solution, with standard potassium iodate solution. From this titration and the usual sodium thiosulfate titration for total halogen, the iodine/chlorine ratio is calculated. Results agree closely with those obtained by the longer chlorine-water method of Lopes. The halogen ratio of reagent grade iodine monochloride, a convenient material from which to prepare Wijs reagent directly, is also determined by the new titration method.     

Functional monomers and polymers, 74. Physico-chemical study on the chitosan-iodine complexes

The adsorption of iodine on chitosan was studied by physico-chemical methods. The scanning electron micrograph measurements of chitosan-iodine adducts showed that iodine molecules were adsorbed uniformly on the chitosan film when the film was treated with aqueous iodine-potassium iodide solution. The thermogravimetric analysis of the adducts revealed that the loss in weight began at about 190°C, and that iodine molecules were thus well-complexed with chitosan. It was also found that the IR spectra of the chitosan films showed the amide I and amide II bands shifted to lower frequencies due to the iodine adsorption. The X-ray diffractometry of these adducts was further carried out, and it was found that the iodine adsorbed chitosan showed no crystalline pattern, different from that of the original chitosan which showed crystallinity in some extent. The chitosan recovered after desorbing iodine by immersion in aqueous sodium thiosulfate solution was amorphous.     

硫化氢中毒窒息事故原因及对策

对近年来发生多起硫化氨中毒窒息事故案例进行分析，总结出硫化氢事故特点，剖析了事故原因，分析了硫化氢危险特性，提出了预防硫化氢中毒窒息事故的对策措施，对多发对硫化氢事故的预防具有现实意义。     

城镇污水处理厂除臭中试

城市污水处理厂臭气的控制与处理已成为一种必然趋势,硫化氢是城市污水处理厂臭气的主要成分之一,其浓度高低在一定程度上代表臭气的产生情况。文章以硫化氢和氨气为对象对广州市某污水处理厂各处理构筑物硫化氢及氨气的产生情况及变化规律做了简要的调查与分析。