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介绍了PET固相缩聚的工艺流程。详述了固相缩聚主要设备如结晶器、固相缩聚塔的结构、工作原理、运行中故障及改造方法。通过改造使安装更加方便,运行可靠,保证连续固相缩聚生产顺利进行。 相似文献
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聚酯连续式与间歇式固相缩聚的比较 总被引:3,自引:0,他引:3
生产涤纶工业丝需采用高粘度聚酯,其生产方法有熔体增粘、连续式固相缩聚、间歇式固相缩聚,这三种方法国外生产厂家都在使用。本文根据我厂工业丝的生产经验,结合国外公司技术交流及出国考察等资料,对聚酯连续式和间歇式固相缩聚进行了多方面的详细比较。 相似文献
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用差示扫描量热仪(DSC) 和热重分析仪分别对普通聚酯切片和通过固相缩聚增黏的聚酯切片进行了热性能和结晶行为的研究。结果表明,固相缩聚增黏的聚酯切片的DSC第一次升温曲线上观察不到结晶吸热峰,说明固相缩聚使聚酯相对分子质量增大的同时,也使其充分得到结晶;固相缩聚聚酯切片的熔点升高;此外,固相缩聚增黏聚酯切片的结晶度较低、结晶尺寸较小、结晶速率较小,而热稳定性优于普通聚酯切片。 相似文献
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在自制的反应器中将结晶态、无定形两种双酚A型聚碳酸酯(BAPC)预聚体固相缩聚合成了高摩尔质量的双酚A型聚碳酸酯.采用DSC、IR对双酚A型聚碳酸酯(BAPC)的熔融行为和结构进行了表征.结果表明,BAPC在固相缩聚后,玻璃化转变温度升高,热稳定性增强,其中BAPC为结晶态时固相缩聚的温度低于无定形态BAPC的固相缩聚温度,且结晶态BAPC固相缩聚后为无定形态. 相似文献
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十四烷辅助下聚酯的固相缩聚 总被引:2,自引:0,他引:2
在200~240℃研究了聚对苯二甲酸乙二醇酯(PET)在十四烷辅助下的固相缩聚反应.结果表明,溶剂辅助下的固相缩聚(分散相固相缩聚)的反应速度较传统气相环境中的固相缩聚更快,最佳反应温度为230℃左右.随着反应温度的升高,分散相固相缩聚得到的PET切片的熔点和结晶度也相应提高.分散相固相缩聚前后PET切片的孔隙率并未发生明显变化.用苯酚处理之后的PET孔隙率增加,有利于小分子扩散,使缩聚反应速率加快.聚合物在十四烷中溶胀导致链活动性增强可能是分散相固相缩聚分子量提高的主要原因. 相似文献
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不同PET切片固相缩聚主副反应规律研究(Ⅲ) 总被引:3,自引:0,他引:3
本文接近于工业生产的装置上对几种不同工艺生产的PET切片的固相缩聚进行了对比研究,指出在固相缩聚中,PET的链增长仍符合普通的二级反应动力学方程,且与文献报道一致。用直接酯化工艺生产的有光切片和半消光切片进行固相缩聚时,其动力学行为相似;用酯交换工艺生产的PET切片进行固相缩聚时,难以得到高分子量的产物;直接酯化中不同TPA/EG配比所得到的PET切片的固相缩聚动力学行为相似。实验还发现,在PET切片的固相缩聚中,羧端基含量有所下降,醚键含量基本不变。这些结果对于为满足不同用途而选择固相缩聚所用的PET切片具有重要意义。 相似文献
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瓶级聚酯的生产技术和应用 总被引:1,自引:0,他引:1
叙述了瓶级聚酯生产概况 ,介绍了以固相缩聚 (SSP)法生产瓶级聚酯过程及其优化技术 ;此外 ,还介绍了它的应用 :如用于矿泉水、碳酸软饮料 (CSD)、热灌装饮料、啤酒等的灌装 相似文献
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The effect of nanomaterials on the solid‐state polycondensation (SSP) of PET was investigated using intrinsic viscosity measurement, wide‐angle X‐ray diffraction, differential scanning calorimetry, and polarizing microscope. The results showed that the montmorillonite nanomaterials could greatly increase the rate of solid‐state polycondensation of PET, probably due to the nucleation of montmorillonite nanomaterials for PET crystallization, which resulted in lower crystallinity, more small crystals, and more surfaces of the crystals. The surfaces of microcrystal and richer amorphous regions benefitted the polycondensation reaction of PET and diffusion of volatile by‐products, which led to the higher rate of SSP. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 971–976, 2004 相似文献
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Continuous production of polyester‐poly(ethylene terephthalate) resins in melt‐phase and solid‐state reactors
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Chi‐Chin Chen 《Polymer Engineering and Science》2017,57(5):505-519
A simple reaction model has applied net polycondensation rates to predict the steady‐state performance of three distinct continuous processes for manufacturing polyester‐PET resins. A net melt‐phase polycondensation rate was described by the simple second‐order kinetics. A net solid‐state polycondensation rate was assumed to follow the modified second‐order kinetics with respect to active end group concentration. A moving‐packed bed requires a longer residence time to deal with the diffusion‐limited SSP of standard pellets or challenging pastilles. The calculations and data showed low IV pastilles to have much slower diffusion‐controlled SSP rates than medium IV pellets. The tanks‐in‐series model demonstrated a narrow RTD in a gas fluidization bed with five mixing stages. Higher reaction temperatures may significantly increase the low diffusion resistance SSP rates of smaller beads or micro‐pellets in a gas‐fluidized reactor. The reaction‐controlled SSP of micro‐beads becomes apparent at 230°C. The high IV melt resins may challenge the slow reaction rates of Ti or Al‐catalyzed SSP resins. The efficacy of catalyst promoters on Ti activity enhancement may depend upon various ligands in Ti glycolate, Ti citrate, or titanic acid. The thermo‐oxidative stability of Ti or Al‐catalyzed resins may decrease at higher hot air drying temperatures (188°C or above). POLYM. ENG. SCI., 57:505–519, 2017. © 2016 Society of Plastics Engineers 相似文献
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从瓶片内在品质和注坯吹瓶工艺2个角度分析了碳酸饮料用瓶片的爆瓶问题;研究了熔融缩聚和固相缩聚阶段优化该瓶片内在品质的措施;全面阐述了在布勒固相缩聚装置上该瓶片的生产技术。 相似文献
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A numerical method to seek a solution for the solid-state polycondensation (SSP) proces has been proposed to analyze the mechanism of SSP. Results expound that, for the industrial SSP process of PET, the overall reaction rate in a single pellet is appropriately simulated by the diffusion and reaction rate jointly controlling the model. From the core to the surface the SSP rate increase monotonically due to a gradual reduction of the concentration of such by-products as ethylene glycol and water. However, the SSP rate at any location within the pellet is constrained between two purely reaction rate controlling cases. © 1995 John Wiley & Sons, Inc. 相似文献
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随着聚酯(PET)行业对能耗与产品质量的要求越来越高,集成整合了水下结晶造粒以及后段固相缩聚的新型固相缩聚技术——EcoSphere应运而生,且已在国内成功投产。从化学反应以及传递原理的角度对固相缩聚的关键影响因素进行了探讨。与此同时对工业领域中固相缩聚的几种工艺路线做了简述,并将EcoSphere与传统固相缩聚技术从工艺路线、产品性能上进行综合对比,结果表明EcoSphere具有一系列的工艺先进性。最后对EcoSphere的进一步改进做出展望,以期推动PET产业的进步。 相似文献