金属乙二醇盐合成工艺的研究

介绍了乙二醇盐催化剂的合成研究进展,详细介绍和评述了金属法、碱法、Nelles法、醇交换法等制取乙二醇钠、乙二醇钾、乙二醇锑、乙二醇钛、乙二醇铝等二元醇盐催化剂的工艺技术,乙二醇盐有着广阔的应用前景.     

软段结构对脂肪族聚氨酯弹性体的结构与性能影响

分别采用聚丙二醇(PPG)、聚四氢呋喃二元醇(PTMG)、聚己二酸一缩二乙二醇三羟甲基丙烷酯多元醇(726)和聚己二酸新戊二醇酯二元醇(756)4种不同软段制备了基于异佛二酮二异氰酸酯(IPDI)的脂肪族聚氨酯弹性体(PUE),并通过FT-IR、DSC和TGA等表征了软段结构对PUE结构与性能的影响。结果表明,在相同硬段含量的条件下,PTMG制备的PUE具有最高的交联密度和最低的氨酯羰基氢键化程度。聚酯型PUE的耐热性和热氧老化性能均优于聚醚型PUE,由756合成的PUE具有最好的老化性能和热稳定性。     

回用乙二醇制备聚酯的评价研究

利用小试聚合装置对新鲜乙二醇(EG)和聚酯生产中的馏出EG在乙酸锑和乙二醇锑2种催化剂条件下聚合评价,制备超有光聚酯切片和膜级聚酯切片,对切片的色相进行检测分析.结果表明:在乙酸锑、EG催化剂条件下,新鲜EG、回用EG制备的膜级聚酯切片要比同条件下制备的超有光聚酯L值、b值高.在乙二醇锑催化剂条件下,新鲜EG、回用EG...     

PET缩聚催化剂乙二醇盐的合成与应用技术进展

介绍了聚对苯二甲酸乙二醇酯(PET)缩聚反应用催化剂乙二醇盐的合成与应用进展;详述了乙二醇锑、乙二醇钛、乙二醇铝催化剂的合成和应用,以及应用各种催化剂的优缺点;指出乙二醇锑催化剂活性高,但污染严重,乙二醇铝催化剂毒性低,催化活性也低。综合考虑,绿色环保的乙二醇钛及其复合催化剂将是聚酯的良好催化剂,将替代现有锑系催化剂,前景看好。     

提高乙二醇紫外线透过率技术进展

介绍了影响乙二醇紫外线透过率的因素，分析了乙二醇产品中的微量羰基化合物杂质是影响其紫外线透过率的主要因素；认为在乙二醇纯化过程中使用吸附、膜分离和添加有关试剂等物理、化学方法可以提高其紫外线透过率。     

我国煤制乙二醇竞争力分析

介绍了我国乙二醇市场现状,截至2019年底,我国乙二醇总产能为1 159万吨/年,其中,煤制乙二醇产能达491万吨/年,2020年还将有近400万吨/年的产能释放。煤制乙二醇技术逐渐成熟,所以短期内市场存在产能增速较快但产量增速缓慢的不匹配状态。比较了石油制乙二醇和煤制乙二醇生产工艺路线的成本,从生产成本、产品质量和物流方式3个维度分析了煤制乙二醇的市场竞争力,得出了煤制乙二醇的发展具有广阔前景,并根据国内乙二醇市场的远期发展趋势,提出了发展建议。     

乙二醇胺化合成哌嗪催化剂及工艺

在固定床反应器中,以乙二醇为原料,胺化合成哌嗪。对催化剂活性组分及载体进行了筛选,并系统地考察了反应温度、压力、乙二醇空速、氨醇物质的量之比和氢醇物质的量之比等对胺化反应的影响。结果表明,Ni-Cu复合金属是合成哌嗪较好的活性组分,丝光沸石作为载体哌嗪选择性较高。在反应温度230℃,压力10 MPa,乙二醇液时空速0.2 h~(-1),氨醇物质的量之比为30,氢醇物质的量之比为1的条件下,乙二醇胺化合成哌嗪反应性能较好,乙二醇转化率为42%,哌嗪选择性为75%。     

新戊二醇改性PET的合成研究

以对苯二甲酸（PTA）、乙二醇（EG）为主要原料,添加第三单体新戊二醇（NPG）合成了一系列不同NPG含量的共聚酯（PENT）,研究了NPG对酯化、缩聚过程的影响,分析了PENT共聚酯的常规性能。结果表明,酯化反应速率和聚合反应速率随NPG含量的增加而下降,共聚酯中的二甘醇（DEG）含量和端羧基（CEG）含量随NPG含...     

国内煤制乙二醇现状及发展建议

为了合理利用煤炭,降低煤制乙二醇风险,提高乙二醇产量,介绍了间接法制乙二醇工艺流程。详细分析了国内煤制乙二醇工业化进展。统计分析了国内拟建及在建的煤制乙二醇项目。发现煤制乙二醇项目存在催化剂缺少长周期、大规模运行经验,产品质量不稳定,单套反应器生产能力小,产业链过短等技术及市场风险。最后以某煤制乙二醇项目为例,通过成本、收益等的计算,发现当原料煤与燃料煤的单价均为450元/t时,煤制乙二醇的成本为5403.62元/t,传统的石油制乙二醇成本为6300元/t,因此煤制乙二醇更具有推广前景。     

聚乙二醇合成工艺

介绍由环氧乙烷与水或乙二醇经分步反应合成聚乙二醇工艺,重点阐述以甲醛为原料合成乙二醇的4种方法和聚乙二醇精制过程。     

硫酸氢钠催化合成二甲基丙烯酸新戊二醇酯

以甲基丙烯酸和新戊二醇为原料、硫酸氢钠为催化剂高效合成了二甲基丙烯酸新戊二醇酯，考察了影响酯收率的各种因素，确定最佳反应条件n(甲基丙烯酸)∶n(新戊二醇)=2.3∶1;催化剂用量7.5%（占新戊二醇质量分数），带水剂环己烷用量60%，阻聚剂对苯二酚用量0.625%，反应温度（110～115） ℃，反应时间2.0 h，酯收率可达94%以上。比较了不同催化剂的催化活性，结果表明，硫酸氢钠具有催化活性好、可重复利用、不腐蚀设备和环境污染小等优点，是合成二甲基丙烯酸新戊二醇酯的优良催化剂。     

Polymers for information storage systems. II. Polymerization kinetics for preparation of highly crosslinked polydimethacrylates

Polymers of ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, and tetraethylene glycol dimethacrylate were prepared by photoinitiated polymerizations in the presence of 2,2-dimethoxy-2-phenyl-acetophenone at 27°C. The reactions led to highly crosslinked polymeric networks. The volume shrinkage observed during polymerization was a function of the number of ethylene glycol units in the dimethacrylate monomer. The kinetic rate constants of polymerization, as determined from the photopolymerization characteristics using a dilatometric technique, were again dependent on the number of ethylene glycol units in the monomer. The importance of these results on the crosslinked structure of the prepared networks is discussed.     

Phase behavior measurement for the ethylene glycol dimethacrylate in supercritical carbon dioxide at temperatures between (313.2 and 393.2) K and pressures from (5.8 to 22) MPa

High pressure experimental data are presented on the phase equilibrium of ethylene glycol dimethacrylate in supercritical carbon dioxide. Pressure-composition (P-x) isotherms were measured in static method at five temperatures of (313.2, 333.2, 353.2, 373.2 and 393.2) K and at pressures up to 22.0MPa. This (carbon dioxide+ethylene glycol dimethacrylate) system has continuous critical mixture curves that exhibit maximums in pressure at temperatures between the critical temperatures of carbon dioxide and ethylene glycol dimethacrylate. At a fixed pressure, the solubility of ethylene glycol dimethacrylate for the (carbon dioxide+ethylene glycol dimethacrylate) system increases with increasing temperature. The (carbon dioxide+ethylene glycol dimethacrylate) system exhibits type-I phase behavior. The experimental result for the (carbon dioxide+ethylene glycol dimethacrylate) system is correlated with Peng-Robinson equation of state using mixing rule including two adjustable parameters. The critical property of ethylene glycol dimethacrylate is predicted with Joback and Lee-Kesler method.     

磷钨酸催化合成缩醛(酮)

以磷钨酸为催化剂,对苯甲醛、丁醛、丁酮与二元醇(乙二醇,1,2 丙二醇)为原料合成6种缩醛(酮)的反应条件进行了研究,较系统地研究了醛/酮与二元醇量比、催化剂用量、反应时间诸因素对收率的影响。结果表明,在醛/酮与二元醇(乙二醇,1,2 丙二醇)的投料摩尔比为1∶1 75,催化剂的用量占反应物料总质量的1 5%,反应时间1h条件下,6种缩醛(酮)的收率为55 2%～79 0%。     

乙二醇循环系统再生工艺研究

在乙二醇循环系统中,重点是乙二醇的再生问题。乙二醇再生效果的好坏,直接关系到天然气处理工艺是否能够正常运行和产品气的质量。详细介绍了三种乙二醇再生的方法:传统再生、预热—换热再生、换热—预热再生,并说明各自工艺的特点、存在的问题和应用情况。最后指出了乙二醇再生工艺的发展趋势并提出了建议。     

煤制乙二醇制备聚对苯二甲酸乙二醇酯及其性能

对分别由煤制乙二醇与乙烯法乙二醇合成的聚对苯二甲酸乙二醇酯(PET)切片进行检测,并将切片用于纺丝、染整试验。试验结果表明:两种PET切片及其纤维的质量一致,而由煤制乙二醇得到的PET纤维的染色性能略优于由乙烯法乙二醇合成的PET纤维。     

Nonionic wetting agents

Purified polyglycol ester and ether types of non-ionic surfactants were investigated to determine optimum structures for wetting hydrophobic soils, peat moss, and standard cotton skeins (Draves test). The most rapid wetting of hydrophobic soil was observed with diethylene glycol monoesters of fatty acids possessing 8,9, and 10 carbon atoms and triethylene glycol monoesters of fatty acids containing 9 and 10 carbon atoms. Methyl pentaethylene glycol decanoate and methyl hexaethylene glycol dodecanoate were also effective wetting agents for hydrophobic soil. Nonionics with slightly longer oxy-alkylene chains most effectively wet Draves skeins and peat moss. Diethylene glycol and triethylene glycol monodecyl ethers also effectively wet hydrophobic soil and peat moss.     

The effect of [bmim][Br] on the solubility of carbon dioxide and methane in glycols at pressures up to 14 MPa and temperatures ranging from 303 to 423 K

Solubility data of methane in ethylene glycol and 1-4 butylene glycol and carbon dioxide in ethylene glycol and 1-2 propylene glycol in the presence of the ionic liquid 1-butyl-3-methylimidazolium bromide have been measured in the temperature range (303–423) K at pressures up to 14 MPa. Henry's law constant of each solute in the studied solvent at saturation pressure is given. The experiments were performed in an autoclave type phase equilibrium apparatus using the total pressure method. For mixtures containing carbon dioxide and ethylene glycol no influence was observed. For mixtures containing carbon dioxide and 1-2 propylene glycol it was observed salting-out effect at 303.2 K and 323.2 K and salting-in effect at the remaining temperatures. For mixtures containing methane and ethylene glycol or 1-4 butylene glycol salting-in effect was observed.     

Determination of Surface Areas of Active Carbons by Retention of Ethylene Glycol and Ethylene Glycol Monoethyl Ether

Abstract

Experiments of ethylene glycol and ethylene glycol monoethyl ether retention on some active carbons were carried out to measure the surface areas of the carbons. Some differences were observed between nitrogen-specific surface area values and those obtained from ethylene glycol retention. However, since the differences decreased through an increase of surface oxygen content as a result of treatment of the carbons with H₂O₂, it was evident that ethylene glycol retention depended upon the surface oxygen content. Also, the surface area values obtained from retention of ethylene glycol monoethyl ether did not depend upon the surface oxygen content. Measurements of the ethylene glycol monoethyl ether retention process could be performed in a shorter time than the equivalent ethylene glycol retention measurements.     

复合固体酸SO4^2-／Fe2O3-TiO2催化合成环己酮缩乙二醇

以复合固体酸SO4^2-／Fe2O3-TiO2为多相催化剂,通过环己酮和乙二醇反应合成了环己酮缩乙二醇。探讨SO4^2-／Fe2O3-TiO2对缩酮反应的催化活性,较系统地研究了酮醇物质的量比,催化剂用量,反应时间诸因素对产品收率的影响。实验表明：SO4^2-／Fe2O3-TiO2是合成环己酮缩乙二醇的良好催化剂,在酮醇物质的量比为1：1．5,催化剂用量为反应物料总质量的2％,带水剂选用环己烷,反应时间1．5h的条件下,环己酮缩乙二醇的收率可达92．7％。