- Retention Characteristics and Sorption Enthalpies of Esters of Natural Hydroxycarboxylic Acids on DB-1 Stationary Phase
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Abstract: Sorption characteristics and retention of esters of glycolic, lactic, malic, and tartaric acids with C1?C8 alcohols of linear structure are studied by gas-liquid chromatography in the temperature range of 90?260°C on DB-1 nonpolar phase. The values of the retention indices of the compounds studied are obtained. On the basis of experimentally determined retention times, the thermodynamic characteristics of sorption under the conditions of limiting dilution are estimated. The dependences of the change in sorption enthalpies on the length of the linear alkyl substituent and on the value of the logarithmic retention index are found. The possibility of estimating the energy of intermolecular interactions of lactic acid esters in the liquid phase is shown on the basis of the obtained values of sorption enthalpies and vaporization enthalpies.
- Portnova,Yamshchikova, Yu. F.,Krasnykh
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p. 577 - 583
(2019/06/03)
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- Synthesis and application of glycolic esters in methanol-gasoline as bifunctional additives
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Summary : To explore new and multifunctional additives for methanol-gasoline, glycolic esters were synthesized and screened as phase stabilizer and saturation vapor pressure depressor. The effect of the esters' structure on the efficiency was discussed. It was found that the stability of the blends depend on the length of the glycolic esters' alkoxy group, and hexyl glycolic and octyl glycolic were found to be the most effective in various gasoline-methanol blends. Additionally, the glycolic esters can depress the saturation vapor pressure of methanol-gasoline effectively as well, and decyl glycolic is the most effective one. With these data, it can be concluded that the glycolic esters have the great potential to be used as bifunctional gasoline-methanol additives.
- Tang, Ying,Cheng, Qitong,Zhang, Jie,Yang, Changchun,Wang, Shanshan,Wang, Xiaoli,Zhao, Zhen
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p. 1109 - 1113
(2015/01/30)
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- Preparation and application of Hydroxyacetic Acid Esters as Methanol-Gasoline additives
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In this paper, hydroxyacetic acid esters (glycolic esters) were synthesized and used as phase stabilizer and saturation vapour pressure depressor of methanol-gasoline. The results show that the stabilities of the blends depend on the length of the glycoli
- Jiang, Xiaoyan,Tang, Ying
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p. 8447 - 8450
(2013/11/06)
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- Bridging racemic lactate esters with stereoselective polylactic acid using commercial lipase catalysis
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A productive and enantioselective hydrolysis of racemic mixtures of lactate esters with commercial Candida rugosa lipase was performed. This step contributes to a novel envisioned route for stereoselective PLA production by combining recent chemocatalytic developments with this biocatalytic contribution, foreseeing two separate l- and d-lactate enantiomer streams. A study of the hydrolysis kinetics identified an unexpected rate determining step at the origin of an unprecedented ester reactivity order.
- Van Wouwe, Pieter,Dusselier, Michiel,Basic, Aurelie,Sels, Bert F.
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supporting information
p. 2817 - 2824
(2013/10/08)
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- HOMOGENEOUS CATALYTIC HYDROGENATION OF DICARBOXYLIC ACID ESTERS. II
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Hydrogenation of dimethyl oxalate in the presence of Ru(CO)2(CH3COO)2(PBu3)2 gives methyl glycolate and subsequently ethylene glycol.The formation of the glycol is favoured by hydroxylated solvents.
- Matteoli, Ugo,Menchi, Gloria,Bianchi, Mario,Piacenti, Franco
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p. 233 - 238
(2007/10/02)
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