氨基胍碳酸氢盐的合成方法改进     

蒋华江  邵红  林荣振  蔡品益 《台州学院学报》1998,(6)

以甲基异硫脲硫酸盐,水合肼等为原料来合成氨基胍碳酸氢盐,并对其合成方法进行改进。  相似文献   

亚磷酸二甲酯清洁生产的研究     

武涛  宁运金 《临沂师范学院学报》2009,31(3):97-100

介绍了以三氯化磷和甲醇为原料制备亚磷酸二甲酯（（CH3O）2POH）的工业化清洁生产工艺及实现零排放的关键技术．制备（CH3O）2POH安全稳定的清洁生产工艺条件：真空度不小于0．088MPa,反应温度不大于48℃,体积V（CH3OH）：V（PCl3）=1：0．7,CH30H和PCl3的流速分别为62L／min,43．5L／min,滴加时间为30min,反应时间80min．（CH3O）2POH经蒸馏,蒸馏终点温度145℃,蒸馏终点真空度不小于0．097MPa,获得含量99％、酸度0．13％的产品（CH3O）2POH．副产品氯化氢、氯甲烷和亚磷酸均得到回收利用,无排放．  相似文献   

炼钢污泥制备聚合硫酸铁铝絮凝剂及应用研究   总被引：3，自引：1，他引：2  

兴虹  田亚赛  孙国军 《辽宁科技学院学报》2010,12(1):26-28

研究了以炼钢污泥为原料制备聚合硫酸铁铝（PFAS）的方法,确定了合理的生产工艺和制备条件,用该絮凝剂处理焦化废水,并与聚合硫酸铁（PFS）的处理效果比较,结果表明,出水的CODCr、总氰化物、挥发酚、色度去除率分别提高约16.9%、12.5%、5.1%和5.3%。  相似文献   

2，6-二叔丁基-4（二甲氨甲基）苯酚的合成   总被引：1，自引：0，他引：1  

曹伟  谢峰  王潇潇  郭澎湃 《内江师范学院学报》2010,25(4):37-39

以2,6-二叔丁基苯酚,甲醛,二甲胺为原料,通过mannich反应合成了抗氧剂2,6-二叔丁基-4（二甲氨甲基）苯酚,并采用红外光谱和质谱对其结构进行了表征．通过正交实验确定了抗氧剂2,6-二叔丁基-4（二甲氨甲基）苯酚的最佳合成工艺：第一步反应温度为5℃,反应时间为40min;第二步反应温度为80℃,反应时间为3．5h;2,6-二叔丁基苯酚与甲醛和二甲胺的物质的量的比分别为1：1．7,1：2．7．产品的收率为94．7％,熔点为91-92℃．  相似文献   

硫酸烧渣制备聚合磷硫酸铁及其对城市生活污水的处理效果   总被引：1，自引：0，他引：1  

李德明 《安徽职业技术学院学报》2010,9(2):24-26

以硫酸烧渣为原料通过煅烧、酸浸、催化、氧化、水解、聚合得到聚合硫酸铁(PFS),并将自己制备的PFS加入到Na2HPO4溶液中,通过调节pH值,在适当的温度下,反应一段时间而得到聚合磷硫酸铁(PPFS)。采用制备的PPFS来处理城市生活污水,通过研究PPFS的用量对城市生活污水的浊度去除率和CODCr的处理效果的研究,确定了投加量。通过研究pH对处理效果的研究,确定了最佳pH值。处理效果显著。  相似文献   

TiO2－Ce（SO4）2光催化氧化体系荧光光度法测定染料浓度     

张一平 《浙江教育学院学报》2014,(5):49-55

基于Ce（ SO4）2可以捕获光生电子从而提高半导体光催化氧化能力的原理,建立了一种用纳米TiO2－Ce（ SO4）2协同体系光催化氧化,然后采用荧光光度法测定染料浓度的简便方法。以茜素红为模拟染料废水,对染料消解的最佳反应条件进行了考察。实验结果表明,pH值0.4,TiO2用量1.0g／L,Ce（ SO4）2初始浓度6.0mmol／L,溶液温度80℃,紫外光照时间12min为最佳的消解条件。  相似文献   

Concrete deterioration under the coupling effects of flexural load, cyclic wetting and drying, and sulfate     

ZHUO Ling  CHEN Bao-fan 《重庆大学学报(英文版)》2014,13(4):151-160

Our research focused on the analysis of concrete deterioration mechanism under the coupling effects of flexural load, cyclic wetting and drying, and sulfate. The relative dynamic modulus of elasticity of a corroded concrete sample was tested, and scanning electron microscope was used to observe the microstructure of concrete under the coupling effects of flexural load, cyclic wetting and drying, and sulfate. Results manifested that flexural load and cyclic wetting and drying during the concrete service changed the corrosion process of the sulfate medium in concrete and enhanced the deterioration of concrete performance. Furthermore, the influencing patterns of strength grade of concrete, mass concentration of sulfate solution, and mineral admixtures on the degree of concrete deterioration were identified.  相似文献   

关于硫酸亚锡生产过程中阳极泥的研究     

卢丹艳  阳吉华 《大众科技》2014,(9):150-151

采用隔膜电解法生产硫酸亚锡,在电解过程中阳极板上均产生一定量的阳极泥。产生的阳极泥沉在隔膜槽底,累积到一定程度将会影响整个电解过程的电解效率。文章针对如何减少电解过程中阳极泥的产出量进行了研究,重点探讨了电解电压、电解酸酸度、阳极板杂质等因素对阳极泥的影响。结果表明,电解电压的高低,阳极板中杂质的含量对阳极泥的产出量有显著的影响。  相似文献   

Individual and joint toxic effects of cadmium sulfate and α-naphthoflavone on the development of zebrafish embryo     

Jian Yin  Jian-ming Yang  Feng Zhang  Peng Miao  Ying Lin  Ming-li Chen 《Journal of Zhejiang University. Science. B》2014,15(9):766-775

This paper aims to evaluate the individual and joint toxicities of cadmium sulfate (CdSO₄) and α-naphthoflavone (ANF) in zebrafish embryos. As a result, CdSO₄ caused both lethal and sub-lethal effects, such as 24 h post-fertilization (hpf) death and 72 hpf delayed hatching. However, ANF only caused sub-lethal effects, including 48 hpf cardiac edema and 72 hpf delayed hatching. Taking 24 hpf death and 48 hpf cardiac edema as endpoints, the toxicities of CdSO₄ and ANF were significantly enhanced by each other. Consistently, both CdSO₄ and ANF caused significant oxidative stress, including decreases in the reduced glutathione (GSH) level, inhibition of superoxide dismutase (SOD) activity, as well as increases in malondialdehyde (MDA) content in zebrafish embryos, but these mixtures produced much more significant alterations on the biomarkers. Co-treatment of CdSO₄ and ANF significantly down-regulated the mRNA level of multidrug resistance-associated protein (mrp) 1 and cytochrome P450 (cyp) 1a, which constituted the protective mechanisms for zebrafish embryos to chemical toxins. In conclusion, co-treatment of CdSO₄ and ANF exhibited a much more severe damage in zebrafish embryos than individual treatment. Meanwhile, production of oxidative stress and altered expression of mrp1 and cyp1a could be important components of such joint toxicity.  相似文献   

Molecular mechanism of pathogenesis of dengue virus: Entry and fusion with target cell     

Seema  S. K. Jain 《Indian journal of clinical biochemistry : IJCB》2005,20(2):92-103

Dengue fever is one of the major health problems in India. Interaction with specific receptor(s) at the cell surface is one of the first events in the pathogenesis of Dengue virus. However, relatively little is known about these receptors. Cellular receptors in human monocytes and mouse neural cells are main target for the viral infection. The envelope protein of the virus (E-protein) plays important role in attachment of virus to target cells and their interaction with cellular receptors. The modulation of receptor gene(s) and/or protein(s) can be used as a method for interfering with virus entry and can thus become a new method for disease prevention. The receptors can be purified by affinity chromatography using E-protein as ligand. It has been reported that addition of highly sulfated heparan sulfate prevents E-protein binding to target cells suggesting that heparan sulfate is utilized by dengue envelope protein to bind to target cells.  相似文献