Single Droplet Mass Transfer Experiments for Acetic Acid Extraction with Triisooctylamine‐Based Solvents

Single droplet mass transfer of acetic acid from aqueous phase into triisooctylamine‐based solvents modified with the Lewis basic modifier tributyl phosphate and the diluent Shellsol T was investigated for applicability in solvent design. Solvent composition of triisooctylamine‐based solvent mixtures has a decisive effect on liquid‐liquid partition of acetic acid. The modifier is needed to correct acid association of the ammonium salt, while the diluent mainly affects the viscosity, the density, and the interfacial tension of the solvent. The results show that single droplet mass transfer is controlled by solvent viscosity.     

Separation performance of thin-film composite nanofiltration membrane through interfacial polymerization using different amine monomers

Four kinds of thin-film composite (TFC) membranes were prepared via interfacial polymerization using diethylenetriamine (DETA), triethylenetetramine (TETA), tetraethylenepentamine (TEPA) and piperazidine (PIP) as water-soluble monomer, and trimesoyl chloride (TMC) as organic-soluble monomer. The surface chemical features of the resultant membranes were confirmed by contact angle measurement and Fourier transform infrared spectroscopy (FTIR). The membrane morphology and surface charges were investigated through Scanning electronic microscopy (SEM) and Zeta potential, respectively. Salt rejection was used to evaluate the separation performance of the four kinds of TFC membranes. The results showed that all the four kinds of TFC membranes exhibited typical negatively charged nanofiltration membrane characteristics. The salt rejections followed the sequence: Na₂SO₄ > MgSO₄ > MgCl₂ and the rejection of Na₂SO₄ was all over 80%. It was also found that the solubility of water-soluble monomer in organic solvent played an important role in manipulating the membrane structure, charge properties and thus the separation performance.     

PET降解研究进展

介绍了国内外开发的聚对苯二甲酸乙二醇(酯PET化)学解聚的工艺方法,包括水解法、甲醇解聚法、乙醇解聚法、乙二醇解聚法等,对主要的化学解聚方法的优缺点进行了综合比较,指出我国应该加强PET解聚技术的研究以,彻底解决资源紧张和白色污染问题。     

Amine-Terminated PAN Membranes as Anion-Adsorber Materials

Anion-adsorbing membranes provide an interesting possibility to remove toxic arsenate and chromate from drinking water. A promising way to prepare anion-exchange materials is to introduce positively charged amine groups on polymers. In this study, polyacrylonitrile (PAN) ultrafiltration membranes were modified with amine functionalities on the membranes. The success of the modifications was demonstrated using infrared spectroscopy and zeta potential measurements. Additionally, the arsenate adsorption was analyzed. The modified membrane showed arsenate adsorption 5 times higher than the pristine PAN membrane.     

咪唑啉类缓蚀剂在模拟再生塔顶介质中的应用

通过红外光谱、腐蚀失重及电化学测试等方法,探讨了以油酸和二乙烯三胺合成咪唑啉类缓蚀剂时二者配比对缓蚀剂缓蚀性能和稳定性的影响,并找到了最佳配比;在模拟胺液再生塔塔顶介质条件下对缓蚀剂缓蚀性能进行了评价,经复配后的咪唑啉缓蚀剂在该环境中具有良好的缓蚀性能.     

Degradations‐ und Energieverhalten reaktiver Amin‐Lösungen bei der CO2‐Absorption/Desorption

Reactive absorption using aqueous amine solutions is the technically most feasible retrofit option for the separation of CO₂ from flue gases. Frequently discussed issues are the realization of a cost‐effective increase in efficiency in the sophisticated overall absorption process and the minimization of the energy demand for solvent regeneration under operating conditions. However, the influence of degradation phenomena on capacity and energy efficiency during the absorption‐regeneration cycles using blended monoethanolamine solutions has been less considered so far. The decrease in capacity depends in particular on time, temperature, O₂‐ and SO₂ concentration in the flue gas and has to be considered in plant design. Addition of degradation inhibitors decreases the energy requirements.     

溶剂萃取动力学的研究（Ⅱ）纯水反萃取有机相中柠檬酸的速率

用上升液滴法研究了纯水反萃取有机相（有机胺－酯酸丁酯－油酸）溶液中柠檬酸的动力学，建立了反萃取动力学经验方程，并考察了温度、醋酸丁酯及油酸对反萃取速率的影响，结果表明反萃取速率的经验方程式可表示为：R'=kb[H3A]^0.6234(0)[R3N]^0.806(0)[醋酸丁酯]^-0.4749(0)[油酸]^1.898(0)。     

Treatment of arsenic ions from produced water through hollow fiber supported liquid membrane

Treatment of arsenic ions from produced water coming along with a gas separation plant in the Gulf of Thailand by hollow fiber supported liquid membrane (HFSLM) was studied. Cyanex^® 923 (a mixture of phosphine oxide), tri-n-butylphosphate (TBP), bis(2, 4, 4-trimethylpentyl) dithiophosphinic acid (Cyanex^® 301), tri-n-octylamine (TOA) and methyltrioctylammonium chloride (Aliquat 336) were used as the extractants. The stripping solution was sodium hydroxide. The concentration of the extractant in liquid membrane and concentration of sodium hydroxide were examined. In addition, the influence of various numbers of runs of the stripping solution through the HFSLM on the concentration of arsenic ions in the outlet stripping solution was observed. Of all the extractants used, 35% (v/v) Aliquat 336 attained high percentages of extraction and recovery of arsenic ions because it reacted with both undissociated arsenic (H₃AsO₃) and dissociated arsenics (H₂AsO₄⁻ and HAsO₄²⁻). Cyanex^® 923, TBP and TOA had low extractability since Cyanex^® 923 and TBP reacted only with undissociated forms while TOA reacted only with dissociated forms. In case of Cyanex^® 301, although it offered a relatively high percentage of extraction but very poor recovery due to this extractant formed very strong complex species with arsenic ions, which slowed down and made the stripping difficult. It was found that the percentage of arsenic recovery increased with the concentration of sodium hydroxide and was almost constant after 0.5 M due to the limitation of mass transfer area of the hollow fibers. After 3-cycle separation, the extraction and recovery of arsenic ions from produced water were 91% and 72%, respectively. Accordingly, the concentration of arsenic ions of 0.1201 ppm in produced water was observed, which was in accordance with the legislation discharge of industrial effluent in Thailand. More arsenic ions were recovered by increasing the numbers of runs of the recycling stripping solution through the HFSLM.     

胺类捕收剂对异极矿等4种矿物浮选行为的影响

考察了不同碳链长度的胺类捕收剂对异极矿、石英、白云石和褐铁矿浮选行为的影响,讨论了胺的碳链长度对捕收异极矿的影响。结果表明,在pH为9~11的条件下,异极矿的浮选回收率最高,胺对异极矿的选择性随着脂肪胺碳链长度的增加而增加,其中,十八胺对异极矿具有较好的捕收能力和选择性。     

新型耐热绝缘材料的研究

以甲氧基二苯醚和乙酰苯胺为原料,合成一种新型的苯胺二苯醚树酯,并与环氧树脂共聚,研究了共聚机理,考察了材料的耐热性.结果表明,共聚物的热分解温度可达365.25℃,温度指数为187.14℃,可作为耐高温绝缘材料应用于电机电器领域.