Preparation and thermal properties of octyl, decyl, dodecyl and tetradecyl stearates as phase change materials for thermal energy storage

Yi, Qiuxia; Tan, Shuai; Jiang, Chunzhu; Guan, Xiaoqin; Wu, Yong

doi:10.1016/j.enbuild.2017.07.074

Cited by 11 publications

(7 citation statements)

References 29 publications

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“…Under optimal experimental conditions, operational stability tests were performed after successive reaction batches in the production of cetyl stearate and lauryl stearate, another interesting wax ester in cosmetic formulations 35,36 . Moreover, lauryl stearate has also been used as a phase‐change material for thermal energy storage, 37 lubricant, and plasticizer 38 . Therefore, the proposed strategy can contribute to reduce the costs of preparing highly active and stable biocatalysts using silica particles from an agro‐industrial waste (rice husks).…”

Section: Introductionmentioning

confidence: 99%

Enzymatic production of wax esters by esterification using lipase immobilized via physical adsorption on functionalized rice husk silica as biocatalyst

Machado

Sabi

Hirata

et al. 2023

Biotech and App Biochem

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The present study consists of developing an enzymatic process for the production of wax esters (lauryl stearate and cetyl stearate) by esterification in a heptane medium. Lipase from Thermomyces lanuginosus (TLL) immobilized via interfacial activation on silica particles from rice husks functionalized with triethoxy(octyl)silane (TLL–Octyl–SiO2) was used as biocatalyst. Maximum immobilized protein loading of around 22 mg g−1 (that corresponds to an immobilization yield of ≈55%) of support was observed using an initial protein loading of 40 mg g−1 of Octyl–SiO2. Its hydrolytic activity (olive oil emulsion hydrolysis) was of 620 U g−1 of biocatalyst. The effect of certain factors on the cetyl estearate production was evaluated using a central composite rotatable design (CCDR). Under optimal conditions (64°C, 21% of mass of biocatalyst per volume of reaction mixture, 170 rpm, and stoichiometric acid:alcohol molar ratio 1 mol L−1 of each reactant), maximum acid conversion percentage of 91% was observed after 60 min of reaction. Lauryl stearate was also produced under such conditions, and an acid conversion of 93% after 60 min of reaction was also achieved. Free lipase exhibited acid conversion of only 15%–20% for both reaction mixtures. After nine successive esterification batches, TLL–Octyl–SiO2 retained 85%–90% of its original activity. These results show the promising use of the prepared biocatalyst in wax esters production due to its high catalytic activity and reusability.

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Section: Introductionmentioning

confidence: 99%

Enzymatic production of wax esters by esterification using lipase immobilized via physical adsorption on functionalized rice husk silica as biocatalyst

Machado

Sabi

Hirata

et al. 2023

Biotech and App Biochem

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show abstract

“…[6][7][8][9][10][11][12][13] Fatty acids and some of their derivatives are important among PCMs because they have a suitable phase change temperature for thermal energy storage, low volume changes during phase change, less flammable, thermal, and chemical stability after phase change transformations, do not show toxic properties and are renewable substances [14] Esters of long chain fatty acids classified as organic PCMs, can absorb and store thermal energy as latent heat and then release this heat at certain phase transition temperature (Figure 1). [3,[15][16][17][18] Compared with free fatty acids, these compounds have some superior properties, such as being noncorrosive and having better latent heat properties. [19][20][21] Esters derived from fatty acids and fatty alcohols known as wax esters are synthesized by many bacterial species as common energy and carbon storage components.…”

Section: Introductionmentioning

confidence: 99%

An Ionic Liquid Promoted Clean and Direct Conversion of Triglycerides into Bio‐Based Thermal Energy Storage Materials

Yıldırım

2022

Euro J Lipid Sci & Tech

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In the present study, triglycerides are subjected to an ionic liquid (IL) catalyzed and solventless transesterification reaction with a series of fatty alcohols in a 1:3 ratio, respectively. In order to prepare the corresponding wax esters, triglycerides trilaurin, trimyristin, and tristearin are treated with fatty alcohols such as lauryl, myristyl, and stearyl alcohol via 1,3‐disulfonic acid imidazolium chloride catalyzed transesterification reaction under environmentally friendly conditions. The optimum duration of the transesterification reaction is determined by proton nuclear magnetic resonance spectroscopy and the progress of the reaction can also be easily followed by thin layer chromatography. According to these studies, the reaction takes about 2 h to complete and the corresponding wax esters are obtained successfully by recrystallization from suitable solvent mixture without tedious work‐up in good to excellent yields (86–100%). Practical Applications: With this sustainable method, a homologous series of wax esters can be successfully synthesized as bio‐based thermal energy storage materials. The prominent aspect of this solventless method is that it allows the preparation of wax esters directly from triglycerides via an ionic liquid catalyzed process both in laboratory and industrial scale.

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“…PCMs derived from SA, i.e., SA itself and its esters, have been used in the literature to produce a variety of latent heat materials, such as nano-and microencapsulated PCMs, composites, and eutectic PCMs. 21 A thorough study on stearate esters was performed by Yi et al 22 These authors investigated the thermal properties of octyl, decyl, dodecyl, and tetradecyl stearates, concluding that these materials have great potential for use in domestic applications.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Thermal Performance of a Stearate Phase Change Material with Graphene Nanoplatelets and MgO Nanoparticles

Prado

Lugo

2020

ACS Appl. Mater. Interfaces

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The effectiveness of dispersed nanomaterials to improve the thermal performance of phase change materials (PCMs) is well-proven in the literature. The proposal of new engineered nanoenhanced phase change materials (NePCMs) with customized characteristics may lead to more efficient thermal energy storage (TES) systems. This work is focused on the development of new NePCMs based on the dispersions of graphene nanoplatelets (GnPs) or MgO nanoparticles in a stearate PCM. The new proposed materials were synthesized using a two-step method, and acetic acid was selected as a surfactant to improve the stability of the dispersions. An extensive characterization of the constitutive materials and the developed dispersions using different spectroscopy techniques is reported. Also, the GnP nanopowder was explored by using the XPS technique with the aim to characterize the used carbon nanomaterial. The obtained spectra were investigated in terms of the chemical bonds related to the observed peaks. The thermophysical profile (density, thermal conductivity, isobaric heat capacity, and thermal diffusivity) was experimentally determined once the main components of the NePCMs were characterized and dispersions were designed and developed. This discussion focuses on the differentiated and distinguished effects of the dispersed GnPs and MgO on the properties of the NePCMs. A comprehensive analysis of the measurements to elucidate the mechanism that promoted higher improvements using GnPs instead of MgO was performed.

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Preparation and thermal properties of octyl, decyl, dodecyl and tetradecyl stearates as phase change materials for thermal energy storage

Cited by 11 publications

References 29 publications

Enzymatic production of wax esters by esterification using lipase immobilized via physical adsorption on functionalized rice husk silica as biocatalyst

Enzymatic production of wax esters by esterification using lipase immobilized via physical adsorption on functionalized rice husk silica as biocatalyst

An Ionic Liquid Promoted Clean and Direct Conversion of Triglycerides into Bio‐Based Thermal Energy Storage Materials

Enhancing the Thermal Performance of a Stearate Phase Change Material with Graphene Nanoplatelets and MgO Nanoparticles

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