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钛白粉生产工艺技术进展 总被引:2,自引:4,他引:2
介绍了硫酸法、氯化法生产钛白粉的工艺流程、反应原理、原材料消耗,以及该种方法的优、缺点。同时介绍了钛白粉的新的生产工艺——盐酸法,介绍了该法的工艺流程,指出该工艺可生产纳米、锐钛型和金红石型钛白粉。该工艺特征是盐酸循环使用,副产物只有氧化铁渣。 相似文献
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针对传统氧化法生产草酸工艺中存在的硝酸用量大,收率低、NO2、NO对环境生产污染等问题,在氧化罐内充氧气,使氧化反应中产生的NO转化为NO2,同时提高反应压力至0.15~0.25MPa,增加NO2在反应液中的溶解度,提高硝酸的利用率,降低了生产成本。 相似文献
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变性淀粉生产有两种方法:湿式法和干法(固态法)。湿式法是在大量溶剂存在的条件下进行的反应,虽均匀但效率低,单耗高。固态法采用特殊反应器,解决了反应物稳定性的难题,反应效率高、单耗低、成本明显下降,且无污染。固态法工艺已用于磷酸酯淀粉,交联淀粉,阳离子淀粉,羧甲基淀粉和氧化淀粉等多种变性淀粉的生产。 相似文献
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介绍了三盐基硫酸铅废渣回收生产工艺。通过对氢氧化钠的加入量、反应时间、反应温度等生产条件的研究,得出了最佳生产工艺条件。进行了氢氧化钠法和碳酸铵法的对比研究,得出了氢氧化钠法生产成本低,转化率高,是值得推广的新工艺。 相似文献
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Kui‐Long Tan Chun‐Xi Li Ying‐Zhou Lu Zi‐Hao Wang 《Polymer Engineering and Science》2009,49(8):1587-1593
An environmentally friendly method for producing chlorinated isotactic polypropylene (CIPP) with chlorine percentage of 28–35, by weight is proposed, in which a reactive solvent, paraffin, is used to replace the commonly used inert solvent of carbon tetrachloride (CTC), an ozone depleting substance being phased out under the Montreal Protocol. This method utilizes the principle that paraffin can dissolve isotactic polypropylene (IPP) at about 150°C and the resulting solution can be chlorinated concurrently, forming two useful products, viz. chlorinated paraffin (CP) and CIPP, which are mutually soluble even at lower temperature, e.g., 70°C. The present method is superior to the conventional CTC solvent method because it can reduce the solvent emission dramatically, enhance the volume efficiency of reactor, and achieve a unified production of CIPP and CP under atmospheric pressure. The structure and properties of CIPP produced by two different methods are determined by differential scanning calorimetry, attenuated total reflectance‐Fourier transform infrared spectroscopy, proton magnetic resonance (1H‐NMR), and 13C‐NMR. The results indicate that IPP chain can be homogeneously chlorinated in paraffin as in CTC solvent via a radical mechanism. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers 相似文献
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A novel process for producing low chlorinated polyethylene (LCPE) with chlorinity of 28–33% by weight is presented, in which a reactive solvent, paraffin, is used as a green solvent to replace the commonly used inert solvent, carbon tetrachloride (CTC), an ozone depleting substance (ODS) being phased out under the Montreal Protocol. This process utilizes the principle that paraffin can dissolve high density polyethylene (HDPE) at about 135°C and the resulting solution can be chlorinated by chlorine forming two useful products simultaneously, viz chlorinated paraffin (CP) and LCPE, which are mutual soluble even at lower temperature e.g.70°C. The present process is superior to the conventional CTC solvent method because it can reduce the solvent emission dramatically, enhance the volume efficiency of reactor and achieve a union production of LCPE and CP under atmospheric pressure. The structure and properties of LCPE produced by two different methods are determined by differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectrometer, proton magnetic resonance (1H NMR), and gel permeation chromatography (GPC). The results indicate that polyethylene chain can be homogeneously chlorinated in paraffin as in CTC solvent via a radical mechanism, and the chlorinity of CP and LCPE is virtually same under optimal conditions. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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介绍了生产氯化石蜡-52的新工艺一利用舱式反应器经光催化法连续生产工艺.该工艺生产稳定、氯气利用率高,产品质量好,是目前较为理想的氯化石蜡制备工艺. 相似文献
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三氟甲烷和氯化氢气体在不同溶剂中的溶解度 总被引:2,自引:0,他引:2
测定了三氟甲烷和氯化氢气体在烷烃、氯代烃、醇、酮、醚、酯等几种有机溶剂中的溶解度,比较了这两种气体在不同溶剂中的溶解度差别,讨论了采用溶剂吸收法对其混合气体进行分离的可能性.结果表明,醇类溶剂如甲醇、正丁醇和甘油对氯化氢具有较高溶解度,在较高的温度下又容易解吸,而且对低压下三氟甲烷的溶解度极低,尤其是甘油基本上不溶解三氟甲烷,使之有可能作为水吸收剂的替代溶剂用于氯化氢和三氟甲烷的分离,以大大降低吸收液对设备的腐蚀性. 相似文献
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概述了氯化石蜡-70的市场需求现状及生产方法,对1000t/a水相悬浮法氯化石蜡-70生产线做出了技术经济评价。 相似文献
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氯化石蜡——70的生产,市场和技术进展 总被引:4,自引:0,他引:4
介绍了氯化石蜡-70的性质和用途,概述了其国内外生产和市场情况,评述了其生产方法和技术进展状况,并对千吨级水相法氯化石蜡-70的生产进行了技术经济评价,最后提出了发展建议。 相似文献
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根据多炉窑冶炼烟气的特点,利用烧碱吸收法处理低浓度烟气和硫酸装置尾气,生产亚硫酸钠,从而实现冶炼烟气的全部治理和制酸尾气的达标排放,具有良好的经济效益和社会效益。对亚硫酸钠系统的生产原理、工艺流程、生产组织及运行方式进行了概述。 相似文献
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本文考察了以石蜡和氯气为原料,在塔式反应器中合成氯化石蜡过程中的流体力学和动力学因素,建立了氯化过程中石蜡氯化深度随时间变化的速率方程式,为设计反应器和指导工业生产提供了参考依据。 相似文献
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