共查询到16条相似文献,搜索用时 93 毫秒
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萃取的目的是除去切片中大部分单体和低聚物,使低分子物含量下降到0.5%左右,以符合纺丝要求。影响PA6切片可萃取物含量的因素有:切片的比表面积、萃取时间、萃取温度、萃取浴比、萃取塔内构件结构和分布。 相似文献
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介绍了20kt/aPA6聚合装置前聚合器的结构及工艺特点;分析了生产中前聚合工艺存在的问题,提出了解决措施;验证了前聚合器结构的设计参数。指出生产中由于前聚合器底部出料温度波动大,波动值达±8.08℃,影响了PA6切片的可纺性。通过降低前聚合反应的压力及加热联苯炉的温度,调整前聚合器顶部冷凝器的排汽温度,前聚合器底部出料温度的波动值可控制在±2.5℃,有效提高了PA6切片的质量。 相似文献
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采用电子同步转移反应(Ene Reaction)制备了马来酸酐化EPDM(EPDM—g—MAH),并在EPDM—g—MAH中原位聚合己内酰胺生成尼龙6(PA6)制备了EPDM—g—MAH/PA6共混型热塑性弹性体。采用X-射线衍射法(XRD)和差示扫描量热法(DSC)研究了原位聚合法和直接共混法制备的EPDM—g—MAH/PA6共混体系的结晶行为。研究表明,230℃下进行阴离子聚合得到的PA6为β-介晶型;EPDM对这种分散在橡胶相中的PA6的结晶具有异相成核作用;原位聚合可在反应增容的基础上使得共混物中PA6的结晶焓进一步降低。动态力学分析频率谱研究表明,增容和原位聚合在削弱PA6组分对刚度贡献的同时可提高橡胶相的弹性响应。 相似文献
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从设备和工艺两大方面对影响涤/锦复合丝质量因素进行了分析和探讨,指出组件加工精度和涤、锦两种熔体粘度接近程度越高是纺好涤锦复合丝的关键。 相似文献
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以60kt/a己内酰胺聚合装置萃取蒸发系统为例,探讨了影响萃取蒸发系统蒸汽消耗的因素,分析了装置节能改造的方案和效果.结果表明:影响己内酰胺聚合装置萃取蒸发系统蒸汽消耗的因素包括萃取水量、萃取水温度、蒸发回流量、蒸发浓缩液固含量;采用三效蒸发+浓缩液闪蒸技术对60 kt/a己内酰胺聚合装置进行改造,同时控制萃取水浴比为... 相似文献
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PA6纤维生产现状及展望 总被引:1,自引:0,他引:1
综述聚己内酰胺(PA6)纤维及其单体己内酰胺(CPL)的国内外生产、消费现状。分析了国内PA6切片和纤维的应用领域和发展前景,并指出今后应大力开发CPL新技术和高附加值PA6纤维,提高PA6纤维在服用领域的比例。 相似文献
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The sequential extraction process (SEP) uses ethanol to extract oil and protein from cracked, flaked, and dried corn, and
the dried corn simultaneously dehydrates the ethanol. Value-added co-products are possible, potentially making production
of fuel ethanol more economical. The effects of solvent-to-corn (S/C) ratio, corn moisture content (MC), and number of extraction
stages on ethanol drying, oil recovery, and protein loss during the simultaneous oil extraction/water adsorption step of SEP
were evaluated. Extractions were carried out by using both aqueous ethanol and ethanol/hexane blends at 56°C. The S/C ratios
tested were 3∶1, 2∶1 (control), 1.5∶1, and 1∶1 (w/w). More anhydrous ethanol, greater oil yields, and less co-extracted protein
were obtained with higher S/C ratios. Less anhydrous ethanol and lower moisture adsorption capacities were obtained when the
corn MC was ≥1.12%. Oil yields gradually decreased with drier corn, whereas protein loss increased when corn MC was <1.12%.
Reducing the number of extraction stages from seven (original SEP) to five did not affect ethanol drying capability, oil yields,
and protein co-extracted with oil. Using ethanol/hexane blends resulted in more anhydrous ethanol, higher oil yields, and
less protein co-extracted with oil. 相似文献