新的润滑油耐极压添加剂

美国彭沃尔特(Pennwalt)公司的润滑油耐极压添加剂“Tribex”为获1987年 I·R100奖的产品,系含硫代锑酸锑的组份,用     

锑的污染及其毒性效应和生物有效性

1锑的简介锑的英文名称为Antimony,其元素符号Sb则来自拉丁文名称Stibium。锑是一种重要的有色金属,有灰锑、黄锑、黑锑3种同素异形体。锑在地壳中质量比含量约为5×10-5%,排在93种天然元素的第64位。锑在自然界中主要有以下几种分布形式:(1)自然锑、锑砷和锑银合金;(2)硫化物和氧化物(如灰锑矿Sb2S3、硫氧锑矿Sb2S2O);(3)含硫盐,主要是由络阴离子[SbS3]3-与Ag、Cu、Pb、Fe形成含硫盐矿物(如车轮矿CuPbSbS3等);(4)氧化物(如锑华Sb2O3、方锑矿等);(5)锑酸盐(如羟锑铅盐等)。而最主要的锑矿物是灰锑矿(Sb2S3)。我国是世界上锑储量最…     

五氧化二锑胶体的制备及应用

叙述了以锑白为原料，用双氧水氧化法制备水系及有机系五氧化二锑胶体的过程，并介绍了五氧化二锑胶体的应用。     

五氧化二锑胶体的制备及应用

叙述了以锑白为原料，用双氧水氧化法制备水系有机系五氧化二锑胶体的过程，并介绍了五氧化二锑胶体的应用。     

有机锑类PVC热稳定剂的合成与制备

概述了聚氯乙烯（PVC）用有机锑类热稳定剂的分类和使用情况，并详细介绍了羧酸锑、硫醇锑、巯基羧酸酯锑、羧酸巯基酯锑、硫代羧酸锑等常见品种的合成方法。     

高折射率含硫树脂光学材料研究进展

有机树脂作为光学材料的重要部分,越来越受到人们的关注。折射率是有机树脂最重要的光学性能指标之一,硫原子既具有较高的摩尔折射度又具有较低的分子色散作用,将硫原子引入分子中是提高光学树脂折射率的最有效方法之一。通过对近几年报道的含硫杂环、含硫砜基、含硫环氧、环硫、含硫丙烯酸酯以及含硫聚氨酯等六种含硫光学树脂的折射率性能研究情况进行分析,简要综述国内外含硫高折射率树脂的研究进展情况。     

光氧离子法处理保险粉生产废气的工程应用

针对保险粉生产过程中产生的含硫有机废气,分析各成分的理化性质及其危害,并介绍一种利用光氧离子法处理保险粉有机废气的工程案例,成功处理有机含硫废气,去除率达到99.0%。     

含硫的有机缓蚀剂用于酸－碱性的金属表面清洗剂

９５－０４７含硫的有机缓蚀剂用于酸－碱性的金属表面清洗剂将一种由含硫的聚亚烷基氧化物组成的有机缓蚀剂添加到一种酸－碱性的金属情洗剂中，以抑制因酸造成的金属表面腐蚀效应，金属表面的酸性清洗剂由≥１的磷酸、硫酸、盐酸、柠檬酸、冰醋酸、氢氟酸、甲酸、草酸、...     

含硫金属有机配合物的研究进展

综述了含硫金属有机配合物的研究进展，总结了巯基氮杂环配体的配位结构。表现在成键方式和分子结构上，极具丰富多样性。对于开展金属含硫配体配合物的合成与表征工作意义重大而深远。     

有机锑热稳定剂

较详细地介绍了有机锑(主要是硫醇锑)热稳定剂的表征及应用范围，同时还介绍了它与其他热稳定剂并用时的效果及用作PVC热稳定剂时的常用配方，建议今后在PVC管材中使用。     

三聚乙醛氯化合成二氯乙醛

二氯乙醛是合成杀虫剂滴滴滴的中间体,它可由三聚乙醛或乙醛接触氯化而制得。作者对氯化反应的条件,包括触媒选择、反应温度的分段控制等作了详细的研究,并获得较好收率的结果。 试验证明,三聚乙醛或乙醛接触氯化的触媒,以三氯化銻活性为好,硫黄次之。反应温度、触媒用量及反应物料分子比等条件必须严加控制。产品中二氯乙醛含量为90～95％,二氯乙醛的收率可达75～78％。 三聚乙醛或乙醛接触氯化的主要副反应是聚合生成焦油状蒸馏残渣。升高反应温度或增加三氯化銻触媒用量,均促使聚合副反应的增加,以致二氯乙醛收率下降。     

稳定剂对低磷化学镀镍液及镀层的影响

在基础低磷化学镀镍液中,分别添加硫脲(TU)、KI、KIO3、含硫有机杂环化合物A和CuSO4等稳定荆,考察其对镀液的稳定性能、镀速、镀层中磷的质量分数和可焊性等的影响.研究表明:化合物A的加入能使镀液稳定性上升,并且可以进一步降低镀层中磷的质量分数.合适稳定荆的加入,不但可以提高镀液的稳定性,同时还能够获得镀速更快、磷的质量分数更低,并且可焊性良好的低磷化学镀镍层.     

火法炼锑生产过程中二氧化硫废气的治理

利用石灰溶液 ,采用湍球和旋流板组合净化装置对锑冶炼生产中的二氧化硫废气进行吸收治理。确定了装置最佳工作条件 ,净化效率达 96 %。经处理后气体中的二氧化硫浓度均达到了国家一级排放标准     

干法脱除煤气中有机硫的研究现状与进展

煤气干法脱硫技术是一种行之有效的煤气脱硫净化工艺,它是整体煤炭气化联合循环发电技术,特别是煤炭多联产的关键环节之一。综述了干法脱除有机硫的技术,并对羰基硫的水解和加氢转化等脱硫技术进行了详细剖析,指出煤气干法脱硫剂的开发应以节能和绿色环保为主要出发点。最后,对有机硫脱硫剂的发展进行展望,提出以复合金属氧化物作为脱硫剂,既能保证脱硫精度,又可降低成本,是较好的选择。     

THE SEPARATION OF METHYL ACETATE FROM METHANOL BY EXTRACTIVE DISTILLATION

Methyl acetate cannot be completely removed from methyl acetate-methanol mixtures by distillation because of the presence of the minimum binary azeotrope. Methyl acetate can be readily removed as overhead product from mixtures containing it and methanol by using extractive distillation in which the extractive distillation agent is a higher boiling oxygenated, nitrogenous and/or sulfur containing organic compound or a mixture of these. Typical examples of effective agents are dimethylsulfoxide, glycerine plus propylene glycol, ethylene glycol plus dimethylsulfoxide plus 1,5-pentanediol. Methanol can be removed as the overhead product from methyl acetate when the extractive distillation agent is nitrobenzene, propylene carbonate or ethylene glycol phenyl ether.     

THE SEPARATION OF METHYL ACETATE FROM METHANOL BY EXTRACTIVE DISTILLATION

Methyl acetate cannot be completely removed from methyl acetate-methanol mixtures by distillation because of the presence of the minimum binary azeotrope. Methyl acetate can be readily removed as overhead product from mixtures containing it and methanol by using extractive distillation in which the extractive distillation agent is a higher boiling oxygenated, nitrogenous and/or sulfur containing organic compound or a mixture of these. Typical examples of effective agents are dimethylsulfoxide, glycerine plus propylene glycol, ethylene glycol plus dimethylsulfoxide plus 1,5-pentanediol. Methanol can be removed as the overhead product from methyl acetate when the extractive distillation agent is nitrobenzene, propylene carbonate or ethylene glycol phenyl ether.     

THE SEPARATION OF ISOPROPYL ETHER FROM METHYL ETHYL KETONE BY EXTRACTIVE DISTILLATION

Isopropyl ether (IPE) cannot be completely separated from its mixtures with methyl ethyl ketone (MEK) by distillation because of the presence of the minimum binary azeotrope. However these two can be readily separated by using extractive distillation in which the extractive distillation agent is a higher boiling oxygenated, nitrogenous and/or sulfur containing organic compound or a mixture of these. Typical examples of effective agents are: ethylene carbonate; adiponitrile and 1,4-butanediol; sulfolane, dimethyl-sulfoxide (DMSO) and triethylene glycol.     

Evaluation of sorbents for thiophene removal from liquid hydrocarbons

Thiophene is a commonly occurring sulfur compound in liquid hydrocarbon streams produced in a petroleum refinery. The concentration of thiophene often needs to be reduced to very low levels for most applications. Selective adsorption of thiophene is investigated in n-heptane, 1-octene and xylenes and their mixtures. A variety of adsorbents were tested for their selectivity and adsorption capacity. Improvements in adsorption capacity were attempted based on analysis of the adsorption mechanism. Adsorption capacity of NaX zeolite was found to be highest among tested adsorbents. However, competitive adsorption from xylenes reduced adsorption capacity for thiophene from mixtures containing large concentration of xylenes. Langmuir model is applied to describe observed competitive adsorption. Selective adsorption of organic sulfur compound could be used as a polishing step in a purification scheme which allows sulfur removal from hydrocarbons at low temperature and without the use of expensive hydrogen.     

川、渝地区高硫煤中硫的分布形态及其脱除率的初步研究

研究了川、渝地区主要高硫煤矿区各种硫的分布形态和经过实验室洗选后各种硫的脱除特性。试验表明,这些高硫煤中的硫大多数为硫铁矿硫,经过洗选大部分可以脱除,而有机硫含量较大的矿区,洗选脱硫的效果不甚理想。     

ESTIMATION OF VAPOR PRESSURES OF ORGANIC NITROGEN AND SULFUR COMPOUNDS BY A GROUP-CONTRIBUTION METHOD

The group-contribution method for vapor pressures of hydrocarbons and organic compounds containing nitrogen or sulfur, based on the kinetic theory of fluids, is revised and extended to include new groups containing nitrogen or sulfur. Good representation is obtained for vapor pressure data in the region 1.30-270 kPa. The method may be used to estimate vapor pressures and enthalpies of vaporization for those organic fluids containing nitrogen or sulfur, where no experimental data are available.