Processes
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2025
·Vol. 13
·期 2
·528
·
IF 2.8
Jianghao Xie,Huizhe Zheng,Jie Jiang,Zhenhao Xi,Ling Zhao
Poly (butylene succinate-butylene terephthalate) (PBST) is a novel high-performance degradable copolyester that combines the advantages of aliphatic polyester and aromatic polyester. This study investigated the intricate reaction kinetics and mass transfer in the PBST polycondensation process using static thin-film experiments. The findings suggest that the apparent reaction rate escalates with increasing temperature, decreasing pressure, and thinner film thickness. Based on the pseudo-steady state assumption, an overall apparent rate model encompassing both reaction kinetics and mass transfer was formulated, and the model was employed to simulate the coupling effects of reaction and mass transfer on the PBST polycondensation process. The simulation results reveal that film thickness has the most significant effect on the degree of side reaction. Film thickness primarily influences the accumulation of BDO(1,4-Butanediol) in the melt during the early stages of the reaction, where BDO accumulates in the melt and intensifies the side reaction under thicker film. And pressure has the most substantial influence on the concentration of BDO as the reaction approaches equilibrium. Additionally, the sensitivity of the growth of molecular weight to pressure is notably higher at low film thickness.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Kaile Shi,Rui Wang,Honghai Wang,Chunli Li,Jiapeng Liu
1,4-Butanediol (BDO) is crucial for biodegradable plastics production and other specialty chemicals, making it essential for numerous industrial applications. However, the synthesis of BDO via the Reppe process introduces impurities such as ethylene glycol, 3-methyl-1,5-pentanediol, and 1,6-hexanediol, and developing efficient BDO purification processes is necessary. Vapor-liquid equilibrium experiments were performed to obtain thermodynamic data, which were then correlated to determine the binary interaction parameters of the thermodynamic models. Batch distillation experiments were further conducted to validate the vacuum distillation for BDO purification. The benchmark separation process involved direct and indirect distillation columns, followed by dividing wall column (DWC) and heat pump (HP) implementations. Evaluation results revealed that the heat pump-assisted indirect distillation sequence (IDS-HP) achieved a remarkable 52% reduction in total annual cost, and the thermodynamic efficiency improved from 9.9% to 45.2%. The heat pump-assisted DWC (DWC-HP) demonstrated the potential to achieve net-zero CO 2 emissions. This research provides both theoretical and experimental foundations for the purification of BDO.
研究领域:
化学工程
·
分离过程
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热力学
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过程优化
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可持续技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Xing Gong,Quantao Liu,Huan Wang,Pei Wan,Shuaichao Chen,Jinyi Wu,Shaopeng Wu
The polyurethane (PU) modified asphalt prepared by melting method has poor thermal storage stability and the PU used is normally synthesized from non-renewable petrochemical resources. This paper aims to explore the feasibility of preparing environment-friendly PU and using it to enhance asphalt properties. Environmental-curable CO 2 -based PPC-PU and ordinary BDO-PU was prepared with poly propylene carbonate diol (PPC) and Butanediol (BDO), respectively. Fourier transform infrared spectroscopy and thermogravimetric analysis were used to examine their chemical compositions and thermal characteristics. Then, these two types of PU were used to modified asphalt and the chemical functional groups, microstructure, storage stability, viscosity, low temperature, and high temperature properties of various modified asphalts were tested. The findings revealed that the prepared PPC-PU and BDO-PU had good thermal stability and the decomposition temperature was above 200 °C. PPC-PU modified asphalt can be gradually cured at natural environment to form a crosslinking network, and the curing rate can reach 86.23% in 15 days. In addition to the low temperature performance, other properties of PPC-PU modified asphalt were gradually improved with the extension of curing time. Compared with BDO-PU modified asphalt, PPC-PU modified asphalt has superior storage stability, low temperature, and high temperature properties. It is concluded that the environmental-curable PPC-PU can improve performance of asphalt while consuming CO 2 . This research offers a fresh concept for producing of green PU modified asphalt.
研究领域:
材料科学
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土木工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Ze-Wang Guo,Zi-Fu Ni,Min-Hua Zong,Wen-Yong Lou
Consolidated bioprocessing (CBP) has emerged as a promising strategy for green synthesis of 2,3-butanediol (BDO) from Jerusalem artichoke tubers (JAT). Here, modular metabolic engineering of Bacillus licheniformis MW3 was implemented, in which the overall BDO synthesis process was divided into four modules (inulin hydrolysis, sporulation elimination, carbon flux redistribution, and enantiopure meso-BDO synthesis). First, endo-inulinase was introduced to boost inulin utilization. Second, sporulation was blocked by spoIIE knockout, thus reducing the leakage risk of the genetically engineered strain from the fermentation plant. Third, more carbon flux was shunted into BDO production via exchanging the alsS start codon, blocking acetoin catabolism, and competing pathways. Finally, enantiopure meso-BDO was synthesized by gdh knockout. Encouragingly, the final engineered strain, MWO-8, produced meso-BDO with 99.3% purity at a titer, productivity, and yield of 82.51 g/L, 1.38 g/L/h, and 0.439 g/g, respectively. To our knowledge, this is the highest titer of BDO from JAT by CBP so far. Collectively, this work provides a highly promising alternative approach for sustainable and cost-effective production of BDO.
研究领域:
生物技术
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代谢工程
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生化工程
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2019
·
IF 10.159
Yawei Sun,Zhao Liu,Fang Chen,Mi Xu,Jinli Zhang,Wei Li
It is a great challenge to regulate the mechanical properties precisely with both softness and toughness so as to match the requirements of various flexible device applications. Inspired by the three-dimensional network of collagen in connective tissues, a novel biopolymer poly(caprolactone-co-urethane) with hierarchical cross-links was synthesized on the basis of polycaprolactone (PCL) and composite chain extenders of tannic acid (TA) and 1,4-butanediol (BDO). The biopolymer P(CL-TAx/BDOy) possesses both physical and chemical cross-links in coordination with phase separation microstructure, sensitive to the molar ratio of TA/BDO. The optimal P(CL-TA1/BDO1) shows connective tissue-like properties, possesses an initial modulus less than 0.5 MPa but high toughness (61.2 MJ m–3), unique adhesive property, and shape memory behavior. A flexible actuator was prepared by P(CL-TA1/BDO1), exhibiting the shape transformation behavior by an electricity stimulation. This work provides a novel facile method to design biopolymers, including tuning the mechanical properties and integrating multifunctions through the hierarchical cross-link strategy.
研究领域:
材料科学
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生物医学工程
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高分子科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Hao Wang,Jun Yuan,Zongmin Zhu,Xianze Yin,Yunxuan Weng,Zhaojia Wang,Feihua Yang,Jiayu Zhan,Hua Wang,Luoxin Wang
It is always a challenge to prepare multifunctional epoxy resins (EP) composites with excellent flame retardance, mechanical property and high transparency. In this work, a reactive flame-retardant (BDO) was synthesized from DOPO, 3,5-diamino-triazolz and thiophene-2-formaldehyde, and taken to prepare EP/BDO composites. Surprisingly, benefitting from the synergy of efficient flame retardant unit (DOPO structure), catalytic curing unit (triazole structure) and optical functional structure (thiophene-2-formaldehyde), the EP composites with excellent comprehensive performance was obtained. In detailed, after adding only 5 wt% BDO, the EP composites passed the UL-94 V-0 level, and the limiting oxygen index was increased to 33% from 22.5% of neat EP. At the same time, EP/BDO-5 showed obvious heat suppression and smoke suppression effects. Besides, EP/BDO-5 presented excellent mechanical strength , that the tensile strength and bending strength were increased by 25% and 30% compared with neat EP. Moreover, EP/BDO composites maintained the same good light transmittance as neat EP, and also presented enhanced T g and dielectric property . In addition, the dual phase flame-retardant mechanism was revealed through systematically analyzing residues after combustion and the gaseous phase products of flame retardant. The above results indicated EP/BDO composites with excellent comprehensive performance possessed a great potential application in high-performance composites fields.
研究领域:
材料科学
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高分子化学
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复合材料
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 9
·3495-3504
·
IF 3.665
Kun Cong,Jiyu He,Rongjie Yang
TPU and flame-retardant TPU (FR-TPU) were prepared through a polyaddition reaction with polytetramethylene ether glycol (PTMEG) and 4,4′-methylene-bisphenyl-isocyanate (MDI) by reactive extruding. 1,4-Butanediol (BDO) and diethyl bis(2-hydroxyethyl) amino methyl phosphonate (DBAMP) were used as the chain extender in different ratios, respectively, to obtain TPU and flame-retardant TPU (FR-TPU)with adjusted molecular weight and mechanical properties. The resulting TPU and FR-TPU were characterized by FTIR, DSC, TGA, and NMR. A kinetic model based on the data from extrusion process was used to depict the polymerization of TPU. These reactions carried out without any solvent and the residual water showed that the polymerization with BDO could be achieved in 20 minutes, instead, that with DBAMP in 55 minutes while with a similar molecular weight. These results point out that Twin Screw Extrusion Reaction (TSER) is a suitable and convenient way to produce a variety of polymers.
研究领域:
材料科学
·
高分子化学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）