有机磷(膦)酸对碱土金属的萃取

Solvent extraction equiliria of four main alkaline earth metals (magnesium, calcium, strontium and barium) with di(2-ethylhexyl) phosphoric acid (DEHPA), 2-ethylhexyl phosphonic acid mono-(2-ethylhexyl) ester, di(2,4,4-tri-methylpentyl) phosphinic acid and IR spectra of the extracts have been studied. The selectivity order is dependent of the e/r value and hydration energy of the metal ions. The minor shift of the P→O in IR absorption of the alkaline earth metal extracts indicates that the interaction between the metal ions and P→O is much weaker for alkaline earth metals than for transitional metals. The distribution of the four alkaline earth elements between aqueous solutions and solutions of DEHPA and neutral organophosphorus compunds, tri-n-butyl phosphate (TBP) or tri-octyl phosphine oxide (TOPO) in kerosene have been determined at varying ratio of TBP or TOPO to DEHPA and the positive synergism is observed. The synergic effects is explained by using IR spectra of the loaded organic phase.     

二-(2-乙基己基)磷酸合成工艺研究

研究了合成二－（2－乙基己基）磷酸的工艺优化条件，通过加入无水AlCl3，严格控制反应温度，控制三氯氧磷加入量过量3％等措施，合成的二－（2－乙基己基）磷酸萃取稀土元素性能优于标准萃取剂。     

磷酸二(2-乙基己基)酯的合成研究

研究了用2-乙基己醇和三氯氧磷反应合成磷酸二(2-乙基己基)酯的方法,考察了原料配比、不同催化剂、反应温度、反应时间各因素对酯化反应的影响以及合理的后处理方法。     

溶剂萃取法提取亮氨酸和异亮氨酸

研究了用二（２－乙基己基）磷酸（Ｐ２０４）作萃取剂,从毛发水解生产胱氨酸的二次母液中提取亮氨酸和异亮氨酸的方法和条件。研究表明,在常温条件下,水相初始ｐＨ为４．０时,用３０％的Ｐ２０４（体积分数）正庚烷溶液,萃取相比为１,可萃取出水相中近７０％的亮氨酸和异亮氨酸。     

P507还原萃进一步提取荧光级氧化铕

阐述了P507还原萃取一步提取荧光级氧化铕工艺,原料为含氧化铕30％左右的钐铕钆富集物。本工艺是在不加惰性气体保护的密闭系统内完成的,产品纯度达99．99％以上,萃取收率大于98．5％。     

2-乙基己基膦酸单(2-乙基己基)酯萃取钯(Ⅱ)的热力学研究

本文研究了2-乙基已基磷酸单（2-乙基已基）酯（P507）萃取钯（Ⅱ）的热力学过程．通过考察P507浓度对Pd（Ⅱ）分配比的影响，调出了萃取反应的表观平衡常数k、焓变△H、自由能变△G和熵变△S．     

硅钨杂多酸催化合成马来酸（2—2乙基己基）酯的研究

以硅钨杂多酸（HWSI）为催化剂,以顺丁烯二酸酐与仲辛醇为原料催化合成马来酸（2－2乙基己基）酯,研究了酯化和磺化反应中催化剂的用量,反应时间,醇酸摩尔比对反应的影响,催化剂能使用多,催化效果均好。     

二(2-乙基己基)磷酸萃取L-色氨酸

以二 (2 -乙基己基 )磷酸 (D2EHPA) -正辛烷 (体系A)及D2EHPA -正辛醇 +正辛烷 (体系B)萃取L -色氨酸为对象 ,研究了D2EHPA浓度、L -色氨酸初始浓度、稀释剂组成以及pH值对萃取平衡分配系数的影响 .结果表明 ,在实验研究涉及的pH值 (1.0     

DOP在聚丙烯加工中的应用

在聚丙中加入少量DOP，使PP塑料的熔体流动速率MI、抗冲击强度和断裂伸长率提高，而拉伸强度、硬度和成型收缩率下降。     

氨基磺酸催化合成棕榈酸异辛酯

在减压条件下以氨基磺酸为催化剂合成了棕榈酸异辛酯。探讨了原料配比、催化剂用量、反应时间、反应温度等因素对酯化率的影响。确定了最佳工艺条件,并考察了催化剂重复使用效果。     

γ射线辐射聚合制备吸油凝胶及其性能研究

以丙烯酸2-乙基己酯(EHA)为聚合单体,二乙烯基苯(DVB)为交联剂,通过γ射线辐射聚合制备吸油凝胶,采用傅里叶红外光谱(FTIR)和热重分析(TG)研究制备的吸油凝胶。在此基础上,研究交联剂含量、单体含量、辐射剂量以及剂量率对凝胶吸附性能和凝胶含量的影响,并进一步研究凝胶的重复使用性能。研究表明,单体含量为31. 9%,交联剂含量为0. 57%,辐射剂量为7.2kGy,辐射剂量率为48Gy/min为凝胶制备的最佳条件。此外,重复吸附实验表明制备的凝胶具有优良的可重复使用性,其第二次使用过程中可快速达到吸附饱和,对甲苯的最大吸附倍率为33.9g/g。     

瓮福磷精矿制取湿法磷酸评价试验

介绍瓮福磷精矿的物化性质,并通过反应活性试验,发泡性能试验及工艺条件试验对该矿制取二水物磷酸进行评价。     

Effect of monomer concentration on the adhesive properties of acrylic pressure-sensitive adhesives

2-Ethylhexyl acrylate (2-EHA)-based co- and terpolymers were synthesized using n-butyl methacrylate (nBMA) and acrylic acid (AA) as comonomers. The change in adhesive properties with the change in monomer concentration was studied. The adhesive, cohesive, and tack characteristics were evaluated under standard conditions as specified by ASTM and/or the Pressure-Sensitive Tape Council (PSTC). The 2-EHA-co-nBMA copolymers showed a good balance between these three characteristics at 50% concentration of 2-EHA. It is noteworthy that with the AA concentration at or above 30% in 2-EHA-co-AA, the polyacrylates lose the tack which is necessary for adhesive bond formation. The 2-EHA-co-AA-co-nBMA terpolymers, where the 2-EHA content was kept constant at 50% and the AA content was varied from 1% to 10% with a corresponding variation in nBMA from 49% to 40%, showed an excellent balance between adhesive, cohesive, and tack strength.     

对甲氧基肉桂酸2-乙基己酯的合成

以对甲氧基苯甲醛为原料,经Knoevenagel反应合成对甲氧基肉桂酸,反应条件用正交试验法优化,即酸醛摩尔比为1.2∶1,催化剂苯胺用量为0.7mL,稀释剂甲苯15mL,反应时间2h,在此最佳条件下收率为95.3%;再以对甲苯磺酸为催化剂,用微波辐射技术,经酯化反应得对甲氧基肉桂酸2-乙基己酯,微波功率320W～400W,辐射40min,产率为85%。     

Separation of yttrium from europium using a hollow fiber-supported liquid membrane with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester as an extractant

The separation of Y(III) from Eu(III) using a hollow fiber-supported liquid membrane with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (EHPNA) as an extractant was studied. The effects of HCl and metal concentrations in the feed solution, the EHPNA concentration in the membrane, and the HCl concentration in the stripping solution on the initial fluxes of the two metals and the separation factor were investigated. The optimum conditions for selective recovery of Y(III) from an equimolar solution of Y(III) and Eu(III) chlorides (0.001?mol?L^?1 each) were as follows: HCl concentration in the feed solution, 0.1?mol?L^?1; EHPNA dimer concentration in the organic phase in the membrane, 0.1?mol?L^?1; and HCl concentration in the stripping solution, 4?mol?L^?1. Under these conditions, complete Y(III) extraction was achieved after 1 ks of operation, and the Y(III) purity in the stripping solution was 84%.     

Energy-Efficient 2-Ethylhexyl Acetate Synthesis with a Nano-Sn-Hydroxyapatite Photocatalyst

A nano-tin oxide grafted natural-hydroxyapatite photocatalyst was fabricated using a greener approach involving sequential application of solar-type and ultrasound-wave energy (STUWE). The protocol provided 76 % higher surface area, 59 % more surface acidity, and 15 % reduced band gap energy than conventionally prepared photocatalysts (CPPCs). The efficacy of the STUWE-promoted photocatalyst (STUWEPC) was optimized for maximization of 2-ethylhexyl acetate yield (97 %) employing an energy-efficient solar-type/ultrasound synergistic batch reactor. A considerably lower activation energy, estimated by Langmuir-Hinshelwood kinetics, and higher reusability characteristics (upto 8 recycles) of the STUWEPC than CPPC highlights the superiority of the STUWE procedure.     

The Combined Effect of the Soft Segment Structure and the Grafted Side Chains on the Thermal Properties and Low-temperature Flexibilities of Polyurethane

Polyurethanes containing polycaprolactone diol or poly(tetramethylene ether)glycol as a soft segment and 4,4′-methylenebis(phenyl isocyanate) as a hard segment were used as a polymer frame. Polydimethylsiloxane was grafted onto polyurethanes to reduce the molecular interactions and to improve the mobility of polyurethanes, and the plasticizing groups, n-butyl and 2-ethylhexyl, were attached to polyurethanes by graft polymerization. With an increase in the polydimethylsiloxane content, the T_g of the polydimethylsiloxane–polyurethanes gradually increased, whereas the T_g of the n-butyl and 2-ethylhexyl-attached polyurethanes was not affected by a change in their composition. The polydimethylsiloxane-grafted polyurethanes demonstrated excellent tensile strength, shape recovery, and low-temperature flexibility.     

热历史对Na_2O－CaO－P_2O_5玻璃水解性的影响

热历史对Ｎａ_２Ｏ－ＣａＯ－Ｐ_２Ｏ_５玻璃水解性的影响刘秋霞，陈晓明，万旺斌（武汉工业大学４３００７０）ＴｈｅＥｆｆｅｃｔｏｆＴｈｅｒｍａｌＨｉｓｔｏｒｙｏｎｔｈｅＨｙｄｒｏｌｉｚａｔｉｏｎｏｆｔｈｅＮａ_２－ＣａＯ－Ｐ_２Ｏ_５Ｇｌａｓｓｅｓ￥ＬｉｕＱ...     

噻吩-2，5-二羧酸的制备

对合成噻吩-2,5-二羧酸的各种路线研究,以及对各种路线所得合成噻吩-2,5-二羧酸进行分析应用,确定了以己二酸和氯气为原料的工艺路线。该路线成本低,工艺简单,需要设备少,合成的产物品质好,收率高,污染少,更容易实现工业化生产。