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废旧泡沫聚苯乙烯的磺化改性及其条件研究 总被引:1,自引:0,他引:1
以废旧聚苯乙烯泡沫塑料为原料,通过磺化改性,合成了水溶性磺化聚苯乙烯系列高分子产品,系统地研究了磺化剂、反应时间以及溶剂介质对磺化反应的影响,从中确定了最佳反应工艺条件。 相似文献
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论述了聚苯乙烯(PS)的磺化反应过程,讨论了磺化剂、溶剂、催化剂以及温度等对PS磺化反应的影响,认为采用不同磺化条件可制得均质或非均质磺化产品。这对废旧聚苯乙烯泡沫塑料的综合利用具有重要意义。 相似文献
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废旧聚苯乙烯磺化反应研究 总被引:7,自引:0,他引:7
探讨了聚苯乙烯(PS)的磺化反应过程磺化剂,溶剂、催化剂及温度等对反应的影响,采用不同的磺化条件可制得均质或非均质磺化产品,这对废旧聚苯乙烯泡沫塑料的综合利用具有重要意义。 相似文献
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采用回流-沉淀聚合法制备单分散聚苯乙烯微球(PS);然后以氯磺酸为磺化剂,通过磺化反应制备了磺化聚苯乙烯微球。测试其粒径、Zeta电位和酸密度,探讨磺化剂的最佳用量和最佳磺化时间,获得了酸密度为2.56mmol·g-1的磺化聚苯乙烯微球;并用红外光谱、热重分析等对其化学组成和耐热性能进行表征。将其作为固体酸催化剂,在催化油酸和乙醇酯化制备油酸乙酯中表现出较高的催化活性。当醇酸比为6∶1、反应温度为80℃、反应时间为6 h、催化剂用量为油酸质量的2%时,酯化率可达88.90%。且该磺化聚苯乙烯微球循环使用3次后,催化活性仍可保持初始活性的95%,在工业制备生物柴油领域具有较好的应用前景。 相似文献
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Zinc-neutralized sulfonated EPDM ionomers (Zn-SEPDM) were prepared by batch and continuous melt sulfonation processes, and the ionomer products were compared with ionomers synthesized by sulfonation of EPDM in homogeneous solution. The efficiency of a batch melt sulfonation using an intensive mixer as a reactor was comparable to that of the solution sulfonation process, but the efficiency of the melt sulfonation in a twin-screw extruder was considerably lower, which was thought to be a consequence of a relatively short reaction residence time due to limitations of the equipment. Melt neutralization was not complete, which produced a dark colored product. However, the incomplete neutralization and the color of the product did not affect the mechanical properties of the melt sulfonated ionomers, which were comparable to those of ionomers made by conventional solution sulfonation. The metal sulfonate concentration alone determined the mechanical properties of the ionomer. Melt sulfonation of Zn-SEPDM ionomers by batch or continuous melt processes appears to be a practical alternative to solution sulfonation, but further optimization of the melt sulfonation processes is needed to ensure uniform sulfonation and complete neutralization. 相似文献
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我国三氧化硫磺化技术的发展概况 总被引:3,自引:2,他引:1
介绍了我国SO3磺化和硫酸化的生产技术发展概况,指出了国内SO3磺化技术的发展水平已接近世界先进水平,逐步形成了磺化和硫酸化产品的专业生产企业,并向大型化和集团化发展。通过不断地研发新产品,已使磺化产品从单一生产烷基苯磺酸与洗衣粉生产装置配套到生产各类磺化和硫酸化产品以满足日化和洗涤剂行业的需要。目前SO3磺化技术的发展正进行脂肪酸甲酯磺酸盐(MES)产业化开发,同时也在进行油脂磺化、石油磺化等工业用产品磺化的研究和开发工作。 相似文献
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以环氧苯乙烷(SO)为单体合成了不同分子量的预聚体聚环氧苯乙烷(PSO),再分别与不同比例浓硫酸进行磺化,得到一系列不同磺化度的阴离子-非离子两性高分子聚环氧苯乙烷磺酸聚醚(SPSO)。结构表征结果表明,PSO的分子量为4030到4950,随着引发剂量的减小,分子量呈递增趋势;SPSO除苯环部分磺化外,主链部分也发生磺化,且主链磺化趋势大于苯环,主链磺化度为200%,其总磺化度范围为287%到365%,随着浓硫酸量的增多总磺化度相应增大。 相似文献
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The mechanism and kinetics of sulfonation of two PEEK model compounds in concentrated sulfuric acid were studied. The first model compound (monomer) is representative of a PEEK repeat unit. The second one is a PEEK dimer. Because both model compounds are fluoroarylketone‐ended, the sulfonation reactions were followed by 19F NMR. The sulfonation reactions were treated following a first‐order kinetics with respect to the unsulfonated PEEK repeat unit. The comparison between the monomer and dimer results showed two different types of sulfonation behaviour. If only one apparent kinetic constant is considered for monomer sulfonation, two kinetic constants were taken into account to describe the dimer sulfonation process. This is due to a rate slowing effect of a sulfonic acid group on the sulfonation of the adjacent PEEK repeat unit. Furthermore, the results also confirm the rate slowing effect of the fluorine atom on the sulfonation of the neighbouring PEEK repeat unit. © 2001 Society of Chemical Industry 相似文献
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介绍了我国SO3磺化技术的发展现状及SO3磺化装置废热回收的现状;介绍了SO3磺化工艺过程废热回收方案;分析了SO3磺化工艺过程废热回收装置运行经济效益分析;分析了磺化工艺过程废热回收换热器使用寿命短的原因,提出了解决设备在应用和推广中使用寿命短的技术难题,对换热器进行材料、结构等方面的改进,使换热器寿命大大延长,节能减排的同时,获得了很好的经济效益,符合国家节能政策,今后将得到更大的应用与发展。 相似文献