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从煤焦油分离提纯蒽和咔唑工艺改进探讨 总被引:1,自引:0,他引:1
溶剂结晶-精馏法是目前从煤焦油中分离提纯蒽和咔唑的比较先进成熟的已工业化工艺,其杂质的脱除主要在溶剂结晶部分,操作步骤多,但杂质分离效果还不是很理想,最终影响产品纯度。通过实验研究,发现结晶物中高杂质母液的滞留是该工艺杂质分离效果难以提高的关键因素。提出了溶剂结晶结合抽滤-精馏法新工艺,给结晶箱组合气液分离器,实现结晶同步抽滤功能,降低结晶物的母液滞留量,可提高分离效果,减少溶剂循环量,提高产品纯度和回收率,降低装置能耗,增加产能,有较好的经济性。 相似文献
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介绍了结晶法精制苯甲酸的三种工艺-升华结晶,溶液结晶,熔融结晶。重点评述了熔融结晶法的装置与应用现状,同时展望了苯甲酸精制的未来发展动向。 相似文献
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通过在氟化氢铵中添加几种不同的物质,用破碎压力法筛选出防结块性能较优的F-1型防结块剂.在氟化氢铵厂的应用实验表明,该防结块剂性能优良. 相似文献
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阐述了精制盐结块的机制,分析了盐的粒径、盐和空气的湿度、环境温度等造成精制盐结块的因素,提出了增大精制盐的粒径、采用未经干燥的湿盐、增加包装和存放点的密封性、选择较为干燥和气温变化较小的贮存环境、控制精制盐的堆积高度、采用特殊设计盐库、缩小运输贮存周期、添加防结块剂等防结块的措施,重点讨论了采用新型防结块剂内消旋酒石酸亚铁的优点。 相似文献
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Bing Han Oluf Bckman Benjamin P. Wilson Mari Lundstrm Marjatta Louhi-Kultanen 《化学工程与技术》2019,42(7):1475-1480
Cooling crystallization was successfully carried out in a batch cooling crystallizer from impure acidic solutions to recover nickel as nickel sulfate salt with three different cooling rates. The compositions of the solutions included impurities of sodium, magnesium, chloride, and sulfuric acid to mimic industrial nickel electrowinning process solutions. The results show that NiSO4·6H2O mainly crystallized, and its solubility and purity decreased with the increase in the mass ratio of chloride to sulfate. Cooling rates did not have a significant influence on crystal purity; however, it did affect the filter cake moisture; lower moisture can be obtained with a lower cooling rate. The sequence of impurity removal efficiency from high to low was Cl > Na > Mg. 相似文献
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针对硫酸锌生产中出现的压滤困难、锌粉用量大、双氧水用量大及排放严重超标、回收率大大降低等问题,进行了一些有建设性地探讨,指出其根源很可能是氧化锌产品中人为地加入了硫化锌矿石粉。 相似文献
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硫酸铵沉淀和层析法分离纯化纳豆激酶的研究 总被引:9,自引:1,他引:9
利用生产纳豆激酶的Bacillus subtilis进行深层发酵.采用发酵液离心除菌,20%~60%饱和度的硫酸铵沉淀,Superdex 75凝胶过滤层析和SP Sepharose Fast Flow离子交换层析对活性组分进行分离提纯.用纤维平版法测定了活力,并用十二烷基磺酸钠-聚丙烯酰胺凝胶电泳法(SDS-PAGE)对分离纯化的效果进行了检验.结果表明在SDS-PAGE中观察到单一条带,分子量27.7 kD,最终纯化倍数和酶活回收率分别为8.4和49%. 相似文献
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Mostafa Khodakarami 《Polymer-Plastics Technology and Engineering》2017,56(18):2019-2042
Separation and purification techniques are applied in many important fields, such as in the medical, chemical, metallurgical, environmental, and pharmaceutical industries. Recent advances in separation science and the urgent need for highly selective purification have necessitated a rapid progress with respect to the reagents, chemicals, and surfactants used in separation processes to attain a high efficiency and selectivity. Polymeric materials have attracted considerable interest, and they have been widely used as extractants, catalysts, and modifiers, in separation and purification processes. This review outlines the recent advances in the use of novel polymers, natural and synthetic, in different separation and purification techniques. Various separation techniques such as chromatography, crystallization, precipitation, distillation, electrophoresis, filtration, and mineral processing methods are discussed, and the polymers used in each method are described in terms of their properties, structure, and function. The application of polymers shows great promise in achieving a highly efficient separation, especially in the areas of membrane separation and water purification. The rational design of new multifunctional polymers with triggered functions presumably presents new opportunities for the development of advanced separation methods. 相似文献
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本文报道了用菱锌矿作原料,制备硫酸锌的工艺条件。该工艺除杂效果好,产品质量符合国家标准。锌的回收率高,操作方便,生产成本低,且对原料的适应性强 相似文献
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采用浮选———酸浸湿法工艺处理锌尾矿,研究了浮选药剂的最佳配比。以湿法处理浮选得到的锌精矿(βzn=36.5%,εzn=56.7%)。可制得符合国标GB8251-87的饲料级ZnSO4·7H2O。 相似文献