余留真空喷淋EG的回用

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     

煤制乙二醇合成聚酯的评价研究

用透光率不同的煤制乙二醇在5 L聚合釜合成PET,并对煤制乙二醇合成的PET产品同石油制乙二醇合成的PET产品相对比分析。     

研究聚酯尾气中乙二醇回收新工艺

通过对聚酯尾气中的乙二醇(EG)回收研究,减少汽提塔外排水质对环境的污染,在不影响生产工艺的情况下对EG的回收利用也起到节能降耗作用。     

连续聚酯装置粗乙二醇在线连续回收直接回用的研究及应用

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。     

回用乙二醇对聚酯装置的影响分析

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.     

聚酯装置自行制备乙二醇锑溶液

介绍聚酯装置自行配套生产乙二醇锑溶液反应原理、工艺流程、以及所用设备的选型、产品的品质指标和经济效益。     

PET生产循环用乙二醇含量分析方法

建立了用气相色谱法测定PET循环用乙二醇含量的分析方法,采用能耐水并使乙二醇与其他杂质分离的石英毛细柱SE-30,60 m×0.50 mm×3μm。结果表明:该方法的准确度回收率为95.20%~101.3%;精密度标准偏差为:1.317 2%;变异系数为1.45%。     

热井EG的循环回用

介绍我厂热井ＥＧ循环回用的特色、作用及结果：用新鲜ＥＧ置换热井ＥＧ后回用,大大减少了回收ＥＧ量,降低单耗和蒸气量,减少污水量,实现节能,环保,大大改善了真空系统的可靠性和安全性。     

聚酯生产中乙二醇单耗高的原因和对策

从聚酯装置的流程、生产原料单耗的理论计算、投入产出的分析入手,通过对辅助工艺单元控制实际运行状况的考察和研究,探讨了精馏分离的有关问题,论述了聚酯生产中EG单耗高的原因,并提出了合理的处理办法。     

聚酯装置EG系统优化

阐述了酯化工艺塔的各项优化措施,降低了乙二醇(EG)的损耗,并对EG系统流程进行了优化改造,降低了装置综合能耗。     

Alkali decomposition of poly(ethylene terephthalate) with sodium hydroxide in nonaqueous ethylene glycol: A study on recycling of terephthalic acid and ethylene glycol

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     

煤制乙二醇生产PET的研究

简要阐述了煤制乙二醇生产聚对苯二甲酸乙二醇酯(PET)的必要性,并以煤制乙二醇为原料制备PET,研究了催化剂、反应时间对PET性质的影响,说明了煤制乙二醇生产PET的可行性。     

试用国产乙二醇锑的实践与启示

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。     

新型催化剂乙二醇锑的试用

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。     

Time-resolved gel permeation chromatographic study on poly(N-isopropylacrylamide)-block-poly(ethylene glycol) prepared by soap-free emulsion polymerization

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.     

聚酯二醇合成的有关计算

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。     

聚酯废丝的化学回收研究

使用乙二醇(EG)对有色聚酯(PET)废料解聚,经分离提纯,得到对苯二甲酸二乙二醇酯(BHET)。研究了物料比、反应温度、反应时间、催化剂对醇解率的影响。结果表明,在m(乙二醇)∶m(PET)=2∶1,反应温度196℃,反应时间3 h,催化剂用量为PET质量的0.5%条件下,聚酯解聚很彻底,产物羟值可达434 mg/g以上,主要成分是BHET单体及其低聚物。并通过IR,DSC,HPLC验证了产物的组成,BHET单体纯度可达96.457%。     

Poly(ethylene glycol) electrolyte gels prepared by condensation reaction

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     

碳酸亚乙酯法合成乙二醇研究进展

综述了碳酸亚乙酯法制乙二醇研究最新进展。对各催化体系进行了比较分析，阐述了反应机理并指出了目前催化体系所存在的问题及发展方向。