Fine Bubble‐based CO2 Capture Mediated by Triethanolamine Coupled to Whole Cell Biotransformation

Carbon capture technology can be set up in combination with biocatalysis to utilize the bound CO₂ as substrate in the Kolbe‐Schmitt like enzymatic reaction. The exemplary whole cell biotransformation of catechol to 2,3‐dihydroxybenzoic acid in a triethanolamine‐mediated multiphase system shows increased equilibrium conversion. Apart from the beneficial thermodynamics, the inherent fluid properties of triethanolamine is enabling easy application of CO₂ fine bubbles as highly efficient gassing method to minimize the CO₂ demand and CO₂ emissions.     

过碱性硫化壬基水杨酸钙清净剂的开发

通过金属化、羧基化、硫化等步骤 ,进行了过碱性硫化壬基水杨酸钙清净剂的开发研究 ,得到较为适宜的原料量比为 :n(氧化钙 )∶n(壬基酚 ) =0 .5∶1 0 ,n(乙二醇 )∶n(氧化钙 ) =( 0 .8～1 0 )∶1 0 ,n(硫 )∶n(氧化钙 ) =( 1.0～ 1.2 )∶1 0 ;各步骤适宜的操作参数为 :①金属化 :温度 16 0℃ ,压力 (N2 )常压 ,时间 4h ;②羧基化 :温度 2 0 0℃ ,压力 (CO2 ) 0 .6～ 0 .8MPa ,时间 2h ;③硫化 :温度 180℃ ,压力 (CO2 ) 0 6MPa ,时间 3～ 4h。产品总碱值达到 183mgKOH/g。     

乙烷催化直接羰基化合成丙酸的研究

采用一种新型的催化体系CaCl2-K2S2O8-CF3COOH,将乙烷直接羰基化合成丙酸。考察了反应过程中温度、反应时间、CO压力和催化剂等因素对反应收率的影响,找出了反应所需的最优化条件,使丙酸的收率达到86.0％左右。给出了可能的反应机理。     

功能化偶氮杯［4］芳烃羧基衍生物的合成及其对铀的吸附实验研究

以对叔丁基杯［4］芳烃为原料,用对氨基苯甲酸对其上沿进行修饰,获得了一种新型偶氮杯［4］芳烃羧基衍生物功能化材料5,11,17,23-四（4-羧基苯偶氮基）-25,26,27,28-四羟基杯［4］芳烃（p-TTPTA）。采用FT-IR、¹H-NMR、SEM和EDS等方法对其进行结构表征,并探讨了吸附时间、溶液pH值、吸附材料用量、铀初始浓度及环境温度等对p-TTPTA吸附铀的影响。结果表明：所合成的p-TTPTA是一种构象稳定、表面粗糙、比表面积较大、能与铀离子配位的化合物;在溶液pH=5、铀初始浓度为20 mg/L、p-TTPTA用量为20 mg、吸附时间为8 h、温度为30 ℃条件下,p-TTPTA对铀的吸附效果最佳,吸附率达93%,说明p-TTPTA对铀具有较好的吸附性能。     

Synthesis of aromatic carboxyl functionalized polymers by atom transfer radical polymerization

The synthesis of aromatic carboxyl functionalized polymers by atom transfer radical polymerization is described. The α‐bromo‐p‐toluic acid ( 1 ) initiated polymerization of styrene in the presence of copper(I) bromide and 2,2′‐bipyridyl affords quantitative yields of the corresponding aromatic carboxyl functionalized polystyrene ( 2 ). Polymerization proceeded via a controlled free radical process to afford quantitative yields of the corresponding aromatic carboxyl functionalized polymers with predictable molecular weights (M_n = 1600–25 900 g mol⁻¹), narrow molecular weight distribution (M_w /M_n = 1.1–1.40) and an initiator efficiency above 0.87. The polymerization process was monitored by gas chromatographic analysis. The functionalized polymers were characterized by thin layer chromatography, size exclusion chromatography, spectroscopy, potentiometry and elemental analysis. © 2000 Society of Chemical Industry     

二氟尼柳及其中间体、衍生物的合成研究进展

介绍了二氟尼柳的特点,评述了经Gomberg-Bachmann偶联、傅克酰化、BaeyerVilliger氧化、水解、羧化或酯直接羧化,及Suzuki偶联法合成二氟尼柳的方法,叙述了二氟尼柳中间体的合成方法,介绍了二氟尼柳的衍生物及其合成方法.对二氟尼柳的工艺和衍生物的开发提出了建议与展望,认为今后的研究应进一步降低二...     

低相对分子质量PA6的制备

以己内酰胺、ω-氨基己酸、已二酸为原料合成了低相对分子质量(-Mn)PA6;研究了反应时间、己二酸用量对PA6试样-Mn的影响,并对PA6试样进行差示扫描量热及红外光谱分析.结果表明:在常压250℃条件下,反应时间12 h,己二酸质量分数(相对己内酰胺)为15％,可制备-Mn约2000,相对粘度1.2,端胺基含量小于1...     

制备二氟尼柳的羧基化工艺研究

以 2′,4′-二氟 - 4-羟基联苯为原料 ,采用与二氧化碳直接羧基化的工艺方法 ,制备得到了解热镇痛药二氟尼柳 ,并讨论了原料配比、反应温度、反应时间、惰性保护气体和碱的种类对羧基化反应的影响 ,得到了较好的效果 ,在优化实验条件下 ,羧基化收率可达 75 %以上     

CO_2低压溶剂羧化法合成2,6-二羟基苯甲酸工艺研究

研究了间苯二酚低压溶剂羧化法合成2,6-二羟基苯甲酸。适宜的反应条件为:反应压力0.4MPa～0.5MPa反应温度140℃,反应时间6h~7h,n(间苯二酚)/n(氢氧化钾)=1/2.05,溶剂为甲苯。在适宜的条件下,产物经洗涤、酸化、脱色和重结晶等后处理工序,产品收率达70%,纯度大于99%(HPLC)。     

Preparation and characterization of dual sensitive carboxylated methyl cellulose/poly(vinyl alcohol) physical composite hydrogel

Neutral methyl cellulose (MC) was transformed into carboxylated methyl cellulose (CLMC) via the esterification reaction between MC and maleic anhydride. FTIR, X‐ray diffraction, and thermogravimetry analysis results indicated the carboxyl groups were successfully incorporated onto the chains of MC. The carboxyl group percentages of CLMC ranged from 6.5 to 13.6%. CLMC and poly(vinyl alcohol) were mixed in aqueous solution, and then formed physical composite hydrogel. The equilibrium swelling ratios of the hydrogels in buffer solutions of pH 10 and 1.5 were 10.7 and 7.5, 7.7 and 6.0, 6.5 and 5.2 when the ratio of CLMC/PVA was 5 : 5, 4 : 6, and 3 : 7, respectively. The hydrogel exhibited both temperature‐ and pH‐sensitive swelling properties, which implied not only the inherent temperature sensitive property of MC was retained but also one more function was acquired. The maximum cumulative release percentages of Rhodamine B from the CLMC/PVA (3 : 7) hydrogel in the mediums of pH 7.4 and 1.2 were 43.36 and 37.44%, respectively. Such a pH‐responsive release behavior also confirmed that CLMC was anionic. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013