Journal of Energy Storage
·
2022
·
IF 8.907
Dongguang Yan,Shilong Zhao,Chi Ge,Jianzhou Gao,Chengyu Gu,Yingqiang Fan
The complicated preparation process and difficulty of recycling were serious obstacles to the widespread use of solid-solid phase change materials (PCMs). Herein, we reported a novel thermoplastic solid-solid PCMs prepared by a facile one-step feeding method. In this study, the esterification and transesterification among the molten mixture of PBT , PEG and adipic acid were conducted to prepare thermoplastic PEG/PBT/Adipic acid copolymer-based PCMs. Adipic acid, as an auxiliary encapsulation agent, could prevent effectively PEG leakage of PEG/PBT/Adipic acid copolymer-based PCMs with high PEG and low PBT content during the phase change process . For PCM-6 containing 91 wt% PEG, 8 wt% PBT and 1 wt% adipic acid, there were no changes in the shape and chemical structure after multiple thermal cycles. The TG results presented that the initial thermal degradation temperature of PCMs-6 was above 200 °C, which was much higher than the processing and working temperature of PCMs-6. The latent heat of PCMs-6 could reach 136.8 J/g, showing great potential for energy storage, especially in the field of green buildings.
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RSC Advances
·
2016
·Vol. 6
·期 113
·111787-111796
·
IF 3.289
Shang Liu,Guixiang Ma,Shaolei Xie,Yongzhong Jia,Jinhe Sun,Yan Jing
Manipulating the phase transition behaviour of phase change materials (PCMs) to a favorable range is an urgent issue which poses a considerable challenge to their widespread application, since PCMs with desirable operational temperatures and high efficiency are very few in practice. An attempt to address this puzzle is presented by confining adipic acid in silica scaffolds through an impregnation method. Three different nanoscale chambers – 2D-hexagonal silicas MCM-41 and SBA-15, and 3D-silica mesoporous foam (MCF) – were employed. In this way, novel form-stable PCMs were developed, which acquired size-dependent thermal behaviour. The evolution of thermal behaviour as a function of pore size was investigated. Phase transition temperature (Tm) deviations presented a strong linear relationship with inverse pore sizes, conforming to the modified Gibbs–Thomson equation. Enthalpy changes (ΔHm) shared the same trend with Tm, as pore sizes decreased, while the variation of phase transition temperatures (ΔTm) was in the opposite direction. Unlike the bulk state, the phase transition temperature of adipic acid in a confined space could be regulated over 90 °C. The maximum thermal storage efficiency was 72% with respect to the confined acid content. Thus, the solid–liquid phase transition behaviour of adipic acid in a confined space could be altered, and the manipulation of thermal behaviour was achieved.
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BIORESOURCE TECHNOLOGY
·
2025
·
IF 9
Xiao Liang,Menglei Li,Qingmao Yang,Chun Shen,Tianwei Tan
Production of biobased adipic acid through hydrogenation of cis,cis -muconic acid has received worldwide attention, but suffers from low efficiency and high cost caused by utilization of noble metal-based catalysts in organic solvent with low initial concentrations. Herein, we propose a new paradigm to produce biobased adipic acid by development and application of a Ni/Al 2 O 3 catalyst system in conjunction with a micropacked-bed reactor. Catalyst screening and effects of reaction conditions have been systematically investigated in a batch reactor, achieving 99.4 % yield using sodium muconate aqueous solution (170 g/L) as the substrate. Furthermore, 99.9 % yield is also obtained with only 110 s residence time and 100 g/L initial concentration. The space–time yield is as high as 21.0 mg/min/mL, which is 2–4 orders of magnitude higher than those of Pd (0.178 mg/min/ml) or Pt (0.0044 mg/min/ml) catalysts. This work may be constructive for efficient production of biobased chemicals in microreactors.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Mengjia Wu,Junhua Di,Lei Gong,Yu-Cai He,Cuiluan Ma,Yu Deng
Adipic acid is an important precursor for manufacturing Nylon-66, and various efficient renewable routes for adipic acid from lignocellulosic biomass are being explored. To effectively valorize biomass into adipic acid, a novel aqueous solution NaOH/ChCl:TH/water (6:24:160, wt/wt/wt) was firstly applied to pretreat sugarcane bagasse (SCB) at a room temperature (25 °C) for a short pretreatment time (1 min) for improving its saccharification efficiency. A deep eutectic solvent ChCl:TH was synthesized by mixing choline chloride (ChCl) and thiourea (TH). The cellulose structure changes of SCB were characterized by FTIR, XRD, SEM, TEM and LSCM. Composition analysis and reducing sugar yield were used to evaluate pretreatment efficiency. Hydrolysis for 72 h, the yields of reducing sugars and glucose from 40 g/L NaOH/ChCl:TH-SCB with complexed cellulases were obtained at 90.2 % and 94.1 %, respectively. Finally, the obtained SCB-hydrolysate was used for adipic acid production by E. coli MG1655 K12. Glucose in SCB-hydrolysate was consumed within 72 h, with a productivity of 0.39 g adipic acid/g glucose, accounting for 72.2 % of the theoretical yield. Further discovery, xylose in SCB-hydrolysate was also consumed for adipic acid fermentation, which contributed to an increase in adipic acid production. In view of transcriptome data, most of the genes involved in carbohydrate metabolism were most significantly up-regulated, which was conductive to improve the yield of adipic acid using biomass-hydrolysate as carbon source. Therefore, the NaOH/ChCl:TH-SCB hydrolysates were a better carbon source for adipic acid fermentation compared to commercial glucose. Obviously, this established rapid room temperature pretreatment with NaOH/ChCl:TH was proven to be effective for enhancing saccharification efficiency of SCB, and the hydrolysates had excellent adipic acid fermentability.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-16
·
IF 14.7
Liu Xiang,Zhu Yu-Quan,Li Jing,Wang Ye,Shi Qiujin,Li An-Zhen,Ji Kaiyue,Wang Xi,Zhao Xikang,Zheng Jinyu,Duan Haohong
Electrosynthesis of adipic acid (a precursor for nylon-66) from KA oil (a mixture of cyclohexanone and cyclohexanol) represents a sustainable strategy to replace conventional method that requires harsh conditions. However, its industrial possibility is greatly restricted by the low current density and competitive oxygen evolution reaction. Herein, we modify nickel layered double hydroxide with vanadium to promote current density and maintain high faradaic efficiency (>80%) within a wide potential window (1.5 ~ 1.9 V vs. reversible hydrogen electrode). Experimental and theoretical studies reveal two key roles of V modification, including accelerating catalyst reconstruction and strengthening cyclohexanone adsorption. As a proof-of-the-concept, we construct a membrane electrode assembly, producing adipic acid with high faradaic efficiency (82%) and productivity (1536 μmol cm −2 h −1 ) at industrially relevant current density (300 mA cm −2 ), while achieving >50 hours stability. This work demonstrates an efficient catalyst for adipic acid electrosynthesis with high productivity that shows industrial potential.
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BIOTECHNOLOGY AND BIOENGINEERING
·
2014
·Vol. 111
·期 12
·2580-2586
·
IF 4.164
Jia-Le Yu,Xiao-Xia Xia,Jian-Jiang Zhong,Zhi-Gang Qian
The C6 dicarboxylic acid, adipic acid, is an important platform chemical in industry. Biobased production of adipic acid is a promising alternative to the current petrochemical route. Here, we report biosynthesis of adipic acid using an artificial pathway inspired by the reversal of beta-oxidation of dicarboxylic acids. The biosynthetic pathway comprises condensation of acetyl-CoA and succinyl-CoA to form the C6 backbone and subsequent reduction, dehydration, hydrogenation, and release of adipic acid from its thioester. The pathway was first tested in vitro with reconstituted pathway enzymes and then functionally introduced into Escherichia coli for the biosynthesis and excretion of adipic acid into the culture medium. The production titer was increased by approximately 20-fold through the combination of recruiting enzymes that were more suitable to catalyze the synthetic reactions and increasing availability of the condensation substrates. This work demonstrates direct biosynthesis of adipic acid via non-natural synthetic pathway, which may enable its renewable production. Biotechnol. Bioeng. 2014;111: 2580–2586. © 2014 Wiley Periodicals, Inc.
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Chem Catalysis
·
2026
·
IF 10.7
Qingmao Yang,Yang Zhang,Xiao Liang,Haodong Chu,Mengdi Li,Runqing Xiao,Weichen Zhao,Chun Shen,Tianwei Tan
Green synthesis of biobased adipic acid (AA) from hydroxyacid feedstocks is challenging due to competing reactivity of hydroxyl and carboxyl groups. Here, we report an aqueous strategy that enables selective removal of the hydroxyl group in 2-hydroxyadipic acid (2-HAA) using a MoO x -Pd/TiO 2 catalyst with in situ -generated Mo–O–H sites. The catalyst achieves 97.3% selectivity to AA. Kinetic analyses, CO and H 2 pulse titration experiments, in situ X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations show that Mo–O–H sites preferentially interact with the hydroxyl group and promote C–O bond cleavage while suppressing side reactions. This study provides mechanistic guidance for rational catalyst design in upgrading biomass-derived hydroxyacids to value-added diacids.
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Crystals
·
2022
·Vol. 12
·期 2
·202
·
IF 2.67
Yanfei Wang,Xiaoyu Chuai,Yifei Li,Jia Guo,Jing Yang,Zhixue Liu,Shijie Xu
In this contribution, we experimentally determined the metastable zone width (MSZW) of adipic acid (AA) in different polar solvents to reveal the nucleation behavior. We performed analyses for different cooling rates, saturation temperatures and polar solvents. The findings showed that the MSZW increased as the cooling rate increased, or saturation temperature or polarity decreased. Here, we suggest that the hydrogen bond donor capacity decreases as the polarity of the solvent decreases, which weakens the solute and solvent interaction and makes the desolvation process more difficult during nucleation. Furthermore, we found that the MSZW is mainly determined by the cooling rate, when the cooling rate is large enough. On account of the classical nucleation theory, it was found that the sizes of the critical nucleus and Gibbs nucleation energy do not increase monotonously with increasing driving force. Moreover, this study confirms that solid–liquid interface tension is associated with crystallization driving force.Keywords:adipic acid;nucleation;MSZW;critical nucleation parameter
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CATALYSIS LETTERS
·
2021
·Vol. 151
·期 8
·2339-2345
·
IF 3.186
Zhang Linfeng,Zheng Jing,Zou Wenya,Shu Yongqi,Yang Weiran
Abstract 3-iodopropionic acid (3-IPA) can be efficiently synthesized from the glycerol derivative glyceric acid (GA), which is a potential biomaterial-based platform molecule. In this report, ethyl 3-iodopropionate was rapidly dimerized to diethyl adipate in a microwave reactor using NiCl 2 ·6H 2 O as a catalyst, co-catalyzed by Mn and the 1, 10-Phenanthroline monohydrate ligand. Under the optimum reaction conditions, diethyl adipate can be obtained with 84% yield at 90 °C in just 5 min. Diethyl adipate was hydrolyzed to obtain the adipic acid (AA) in 89% yield with an acid catalyst. AA is an important chemical and a monomer for producing a wide range of high-performance polymeric substances. This rapid coupling method is also applicable to other alkyl halides. Graphic Abstract
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FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 5
·817-824
·
IF 1.113
Ma Xuebin,Xu Tingting,Chen Wei,Wang Rui,Xu Zheng,Ye Zhiwen,Chi Bo
New applications call for many new requirements. In order to improve the toughness of aldehyde hyaluronic acid (A-HA) and adipic acid dihydrazide (ADH) hydrogel, the poly(ethylene glycol) (PEG) was added. PEG content and molecular weight have little effect on the gelation time, and the composite hydrogels can form in situ within 20 seconds at room temperature. The press test showed that the hydrogels containing PEG possessed a better compression resistance, after pressed more than five times, the composite hydrogels could restore. Rheological properties were measured to evaluate the working ability and the effect of PEG on hydrogels. By analyzing the shear viscosity ( η
γ=0.01 ), yield stress ( σ
0 ) and threshold shear stress ( σ
c
), the addition of PEG can make the structure of composite hydrogels get loose and improve the shear resistance. Especially, PEG800 can enhance the antishear ability obviously. The amplitude sweep tests showed a broad linear viscoelastic region, indicating a wide processing range. In the meanwhile, we also found that PEG can improve the optical transmittance of xerogel evidently.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2017
·
IF 4.727
Xi Ren,Shumin Peng,Wei Zhang,Chunwang Yi,Yuan Fang,David Hui
In this study, a series of adipic acid-polyoxypropylene diamine copolymer (AA-PPA) was prepared by copolymerizing polyoxypropylene diamine (PPA D400) and adipic acid (AA). The AA-PPA with weight-average molecular weight ( M w ) = 10400 and weight-average molecular weight ( M n ) = 7600 was used to modify diglycidyl ether of bisphenol A (DGEBA) epoxy/diethyl toluene diamine (DDM) system. This extended polyether AA-PPA showed unique advantages over traditional polyether at achieving the synchronous enhancement of strength and fracture toughness . With 30 wt% AA-PPA, the bending strength , tensile strength , elongation at break and impact strength were improved by 7.50%, 6.90%, 36.13% and 288.00%, respectively. The single glass transition temperature ( T g ) step proved the homogeneous phase structure of modified epoxy resins. Inevitably, the T g of modified epoxy decreased for the addition of soft segments. The dynamic mechanical analysis (DMA) results indicated that the storage modulus of modified epoxy increased with the increasing content of AA-PPA, while the loss modulus decreased. The interaction of the crosslinked network was explained by calculating the theoretical and measured values of the molecular weight between the crosslinks. The morphology showing the ductile fracture of modified epoxy was testified by scanning electron microscopy (SEM).
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2013
·
IF 2.004
Binwei Shen,Qinbo Wang,Yufang Wang,Xiang Ye,Fuqiong Lei,Xing Gong
The solubilities of adipic acid in acetic acid + water mixtures at (303.2 to 333.2) K and acetic acid + cyclohexane mixtures at (303.2 to 343.2) K are measured. The measured solubility of adipic acid in acetic acid + cyclohexane mixtures with the mass fraction of acetic acid in the solvent mixtures at (0.1 to 1.0) decreases with increasing mass fraction of cyclohexane at constant temperature. However, for the solubility of adipic acid in acetic acid + water with the mass fraction of acetic acid in the solvent mixtures at (0 to 1.0), acetic acid with a mass fraction of 50 % has the best dissolving capacity for adipic acid at constant temperature. The experimental data was correlated by the nonrandom two-liquid (NRTL) activity coefficient model, and the values of the solubilities calculated using the model showed good agreement with the experimental observations.
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