共查询到20条相似文献,搜索用时 140 毫秒
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Gomi.JA Garc.VG 《绿箭信息》2000,1(6):8-12
考察了由对羟基扁桃酸钠(SPHE)电解合成对羟基苯甲醛(PHB),并获得了很好的合成条件。使用的电化学反应器是带有炭毡电极(阴极和阳极)的分隔式压滤器,依据选用的交换膜使用了两种不同的阳极电解液。例如,用阳离子Na-fion 117膜时使用的阳极液为2.7mol/l的NaOH溶液中的0.6mol/L SPHM。使用阴离子Ionac MA-3475膜时用1.8mol/L NaOH溶液中的0.6mol 相似文献
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改进DSA性能满足离子膜电槽的需求潘会波(西北有色金属研究院710016)前言离子膜电解法是氯碱工业在70年代中期推出的一种新的工艺,该工艺的技术关键是使用对离子具有选择透过性的离子交换膜(全氟阳离子交换膜),它只允许Na+由阳极区进入阴极区,不允许... 相似文献
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考察了电解着色的各种工艺条件,其中包括外加电压,温度,时间,pH值,SnSO4浓度假和络合剂BY-X的浓度,得出了铝阳极氧化膜着色速度和着色均匀性相对于各种工艺条件的变化规律。 相似文献
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迟玲珍 《中国石油和化工标准与质量》1998,(5):19-21
进入电解槽的二次精制盐水(以下简称盐水)质量,是离子膜电解槽正常生产的一个关键因素,盐水质量不仅影响离子交换膜的使用寿命和其性能的充分发挥,而且是装置能否在高电流密度运行时得到高电流效率的至关重要的因素。表征盐水质量的主要指标是盐水浓度和不纯物含量。影响离子膜操作性能或对膜本身造成伤害的不纯物,主要包括多价金属阳离子(Ca、Mg、Sr、Fe、Ni、Al、Ba、Si及Mn等)。它们最高允许含量为:(Ca~(2+)+Mg~(2+))%<20×10~(-9);Sr~(2+)%<100×10~(-9);Ba~(2+)%<… 相似文献
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文中简要介绍了聚氯乙烯的性能、用途及改性产品的工业发展历史,预测了其掺混业的发展前景,主要研究了SBR、NBR和CPE对PVC/MBS体系性能的影响,其中SBR对复合体系冲击强度的贡献较大,而NBR则大大改善了体系的拉伸强度和弯曲强度,CPE的加入可以减缓体系弯曲强度的下降趋势。 相似文献
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讨论了不同第三组分和不同种聚乙烯对以聚苯乙烯为基质的PS/PE共混体系结构和性能的影响,发现苯乙烯-丁二烯-苯乙烯嵌段共聚物和苯乙烯-氢化丁二烯-苯乙烯嵌段共聚物作为第三组分对PS/PE共混体系均具有增容作用,用SBS的效果比SEBS好,而SBS的结构对增韧效果的影响不大。在SBS存在下,LLDPE对PS增韧效果最好,HDPE次之,LDPE最差。 相似文献
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本文在研究了SBS/L/-PB/TEGDA(TMPTA)均相光敏体系对特定光源(低压汞灯,λ=254nm)发射光吸收的基础上,按剩余膜产率(Y)绘制出感光特性曲线(Y-t)确定出Y随L-PB和TEGDA(或TMPTA)用量变化的规律,求算了优选体系的量子产率,以剩余膜产率和灰梯度尺法测定了上述体系的相对感度。 相似文献
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SBS压敏胶的性能与结构 总被引:5,自引:0,他引:5
本文研究了萜烯树脂和操作油用量对SBS压敏胶性能的影响,并用TEM研究了SBS共混体系的结构,认为萜烯树脂和操作油与SBS中的PB相相溶性较好。 相似文献
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选择性螯合滴定法测定铋 总被引:4,自引:0,他引:4
用MSA为释放剂,选择性螯合滴定法测定镀层和镀液中铋。用EDTA螯合Bi^3+和其他阳离子,然后加入MSA分解Bi-EDTA螯合物,释放出的EDTA用锌标准溶液返滴定。实验结果表明,各种阳离子都不干扰。该方法已成功地用于测定锡铋铈合金镀层和镀液中的含量。 相似文献
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以苯为初始原料,采用先硝化后磺化及用液体三氧化硫作磺化剂新工艺生产间硝基苯磺酸钠,降低了原材料和动力的消耗,提高了产品的纯度,减少85.7%的废渣排放量,并使生产装置的原生产能力增大两倍以上,获得了显著的经济效益。 相似文献
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钛基二氧化铅阳极电化合成高氯酸钠的研究 总被引:3,自引:1,他引:2
介绍了以钛基体二氧化铅作为阳极,电解氯酸钠合成高氯酸钠的过程,考察了电解温度,电解液初始氯酸钠浓度及氯化钠浓度对电流效率的影响,得出了电解反应的最佳条件。 相似文献
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引言苯丙酮酸钠(PPNa)是一种不稳定的有机酸盐,在空气中易被氧化,能溶于水,不溶于醇和醚.它可通过向苯丙酮酸(PPA)的乙醇溶液中流加NaOH水溶液反应沉淀而得.这一结晶过程涉及到混合-快速反应和快速成核过程.控制结晶条件以得到高纯度、高产率的PPNa产品是氯苄羰基化合成苯丙酮酸盐技术的关键之一.因为苯丙酮酸及其盐是酶法合成L-苯丙氨酸(L-Phe)的主要原料,而L-Phe是甜味剂天苯二肽的限制性生产原料.高附加值的天苯二肽的市场需求年年增加,刺激了国内外对苯丙酮酸及其盐的合成精制技术研究的兴趣,但由于对其专利保… 相似文献
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Sodium sulphate is produced mainly from land ores by conventional crystallization methods of evaporation and dehydration; these sources are fast being exhausted and new processes should be found which do not use the conventional sources. Seawater bittern produced as by-product from solar halite plants contains about 6% by weight of sodium sulphate, the recovery of which by conventional methods, is made difficult by the presence of other salts.
Methanol has the property of markedly depressing the solubility of certain inorganic salts while hardly affecting the solubilities of others, because of this property, it can be used to promote various crystallization processes and some double decomposition reactions between inorganic salts. This paper examines one example of the second type of application in which magnesium sulphate and sodium chloride present in the bittern interact in the presence of methanol resulting in the formation and selective crystallization of anhydrous sodium sulphate.
Experimental work is described which follows the progress of the reaction under wide range of conditions some given above 94% recovery of high purity sodium sulphate with a crystallizer reactor residence time of 20 minutes. SEM photographs reveal rhombic shapes crystals of size varying between about 1 to 5 μrn. The results presented give promise of forming the basis of a commercially viable process for the fabrication of sodium sulphate. 相似文献
Methanol has the property of markedly depressing the solubility of certain inorganic salts while hardly affecting the solubilities of others, because of this property, it can be used to promote various crystallization processes and some double decomposition reactions between inorganic salts. This paper examines one example of the second type of application in which magnesium sulphate and sodium chloride present in the bittern interact in the presence of methanol resulting in the formation and selective crystallization of anhydrous sodium sulphate.
Experimental work is described which follows the progress of the reaction under wide range of conditions some given above 94% recovery of high purity sodium sulphate with a crystallizer reactor residence time of 20 minutes. SEM photographs reveal rhombic shapes crystals of size varying between about 1 to 5 μrn. The results presented give promise of forming the basis of a commercially viable process for the fabrication of sodium sulphate. 相似文献
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Present inventory of Hanford single shell tank waste is about 180,000 tons. More than 70%by weight of the tank waste are non-radioactive sodium nitrate. The paper presents an entirely different approach to pretreatment of Hanford radioactive waste stored in underground tanks. Instead of removing radionuclides, 137Cs in this case, from the bulk of the waste, this process selectively recovers the non-radioactive sodium salts from the waste by crystallization. It opens up a possible new way of looking at waste pretreatment. The feasibility teat has been done at the facility of Westinghouse Hanford Company. The result shows a potential of reclaim sodium nitrate with a total activity of less than 60 pCi/g
The objective of the research is to develop and demonstrate a scaleable crystallization process to recover sodium nitrate from aluminum and cesium containing mother liquor. Per-pass crystal yields and separation factors as well as the effects of crystal size, slurry density, growth rate and mother liquor concentrations on occlusion and entrainment are studied. 相似文献
The objective of the research is to develop and demonstrate a scaleable crystallization process to recover sodium nitrate from aluminum and cesium containing mother liquor. Per-pass crystal yields and separation factors as well as the effects of crystal size, slurry density, growth rate and mother liquor concentrations on occlusion and entrainment are studied. 相似文献
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无熟料硅酸钠矿渣水泥的水化机理 总被引:9,自引:0,他引:9
利用三甲基硅烷化方法,借用气相色谱、凝胶渗透色谱测定和比较在高炉矿渣中加入少景硅酸钠或氢氧化钠制成的矿渣水泥在不同水化龄期硅酸根阴离子聚合状态的变化。从其变化规律可知,矿渣水泥在水化过程中有缩聚和解聚两种作用。利用扫描电镜、电子衍射,并结合能谱分析技术对矿渣水泥的水化产物进行了分析和鉴定。对矿渣水泥的结构和硬化过程作了一定的探讨和研究。 相似文献