共查询到19条相似文献,搜索用时 109 毫秒
1.
余留真空喷淋EG的回用 总被引:1,自引:0,他引:1
分析了钟纺聚酯工艺停工过程真空喷淋EG质量指标恶化的原因 ,通过控制停工时的各项操作 ,减少停工过程对喷淋EG的污染程度 ,达到对停工余留EG进行回用的目的 相似文献
3.
4.
使用具有新型塔内件的高效填料塔技术,首次成功的研究开发了DMT法连续法生产聚酯装置的粗乙二醇在线连续回收.并直接回用的技本.生产运行结果表团.在保证生产稳定、产量、质量不变的前提下,取得了显著的节能降耗经济效果。 相似文献
5.
介绍了两种固相缩聚生产中的氮气净化工艺.从全厂乙二醇输送流程、聚酯装置的乙二醇原料组成、乙二醇分配系统设计和聚酯工艺设备设计四个方面分析了乙二醇洗涤工艺对聚酯装置设计的影响,用于指导聚酯装置设计,降低回用乙二醇对聚酯装置的影响. 相似文献
6.
7.
8.
9.
10.
11.
Pellets of poly(ethylene terephthalate) (PET; 0.48–1.92 g) were heated in anhydrous ethylene glycol (EG; 5 mL) with 2-equivs of NaOH at 150°C for 80 min or 180°C for 15 min to convert them quantitatively to disodium terephthalate (Na2-TPA) and EG. The disodium salt was precipitated quantitatively in pure state from the EG solution and separated readily. The other product EG, being the same component to the solvent, remains in the solution and can be obtained after distillation as a part of the solvent. The rate of decomposition was significantly accelerated by the addition of ethereal solvents to EG, such as dioxane, tetrahydrofuran, and dimethoxyethane. The reaction system is simple; no water and no extra reagent other than NaOH and EG are used. A few recycling systems of PET can be designed on the basis of the present alkali decomposition reaction. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 595–601, 1997 相似文献
12.
13.
试用国产乙二醇锑的实践与启示 总被引:5,自引:1,他引:5
阐述了在PET缩聚反应中试用乙二醇锑的情况和产品对纺丝性能的影响。指出与Sb2 O3相比 ,乙二醇锑的添加液配制温度低 ,省时 ,带入杂质少 ,二者催化效能等同 ,但新型催化剂售价贵 ,用量多。纺丝及后加工性能有所改善。 相似文献
14.
新型催化剂乙二醇锑的试用 总被引:2,自引:0,他引:2
介绍乙二醇锑溶液的配制及试用情况。结果表明溶液配制简化,可提高缩聚能力,减少引进杂质,L值、b值均有较大改善,提高满卷率和一等品率,延长过滤器寿命。PET切片成本增加8元/t。 相似文献
15.
Ryuhei Motokawa Takayuki Nakahira Masahiko Annaka Takeji Hashimoto Satoshi Koizumi 《Polymer》2004,45(26):9019-9022
To synthesize an amphiphilic block copolymer of poly(N-isopropylacrylamide)-block-poly(ethylene glycol) (NE), an aqueous soap-free emulsion polymerization system was employed where poly(N-isopropylacrylamide) (PNIPA), polymerized from the radically activated chain ends of poly(ethylene glycol) (PEG), forms micelle cores stabilized by PEG brush chains emanating there from. When this polymerization was carried out at temperatures equal to or higher than 34 °C, narrowly-dispersed NE, which cannot be obtained by solution polymerization, was successfully obtained. To elucidate the living nature of the soap-free emulsion polymerization, time-dependent monomer conversion and molecular weight of NE was investigated by time-resolved gel permeation chromatography (GPC). The results indicate that the compartmentalization of end radicals into micelles cores leads to the quasi-living behavior of the polymerization. 相似文献
16.
以实验为基础,对用己二酸与乙二醇、丙二醇、丙三醇合成的用于氨纶的聚酯二醇进行有关计算。诸如根据产物官能度为2.33,羟值为35~37mgKOH/g的要求,计算丙三醇的加入量,产物的聚合度,产物中1,2 乙基与1,2 亚丙基的比例等。 相似文献
17.
Poly(ethylene glycol) electrolyte gels were prepared by condensation reaction in the presence of tetraethoxysilane. Differential scanning calorimetry and X‐ray diffraction spectroscopy were used to investigate the thermal transition behavior and crystalline structure of polymer gels prepared. Both formation of crosslinks and incorporation of salts or plasticizers reduced the development of crystalline structure of poly(ethylene glycol)s. Cyclic voltammetric and ion‐conducting behaviors of polymer gels were analyzed using potentiostat and impedance spectroscopy, and those were also considerably affected by the crosslinking density of polymers and the concentration of electrolyte salt or plasticizers incorporated. Poly(ethylene glycol) gels possessing certain levels of electrolyte salt and plasticizer were expected to have applications of solid electrolytes for lithium polymer secondary batteries. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 948–956, 2002 相似文献
18.