Liquid–liquid equilibria for ternary systems polyoxymethylene dimethyl ethers + para-xylene + water

Zhihai, Zhuang; Zhang, Jianqiang; Liu, Xianke; Liu, Dianhua

doi:10.1016/j.jct.2016.05.016

Cited by 18 publications

(22 citation statements)

References 21 publications

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“…The mutual solubility of ternary liquid–liquid equilibria for water + PODE 1–4 + o -xylene was measured by analyzing the composition of equilibrated two liquid phases in a thermostated flask. The LLE determination apparatus of this work was similar to that in our previous work . The temperature of the experiment was controlled steadily and accurately by a constant temperature circulating water device.…”

Section: Methodsmentioning

confidence: 99%

“…Kuhnert et al researched ternary systems (formaldehyde + water + methylal) and (formaldehyde + methanol + methylal) and a quaternary system (formaldehyde + water + methanol + methylal) and found that the experimental results were consistent with the predicted results. Zhuang et al measured the LLE data for ternary systems (PODE 1–4 + p -xylene + water) and found that the UNIQUAC model showed a better correlation for ternary systems than the NRTL model. There are few available literature studies about LLE data on these ternary systems.…”

Section: Introductionmentioning

confidence: 99%

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Liquid–Liquid Equilibrium for Ternary Systems of Polyoxymethylene Dimethyl Ethers + o-Xylene + Water at 293.15 K

Tian

Liu

2019

J. Chem. Eng. Data

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Polyoxymethylene dimethyl ethers (PODE n ) are excellent diesel blending components which can eliminate exhaust gas emissions compared to conventional diesel. During the production process of PODE n from methanol and formaldehyde solution, the most important key is to find an appropriate phenomenon for the separation of water and formaldehyde from PODE3–6 in advance. In this work, ternary liquid–liquid equilibrium (LLE) data were determined at T = 293.15 K under atmospheric pressure for the following systems: PODE1 + o-xylene (OX) + water, PODE2 + OX + water, PODE3 + OX + water, and PODE4 + OX + water. Hand and Othmer–Tobias equations were utilized to confirm consistency of the experimental LLE data. The NRTL and UNIQUAC activity coefficient models were applied to correlate the experimental LLE data, and the corresponding binary interaction parameters and LLE phase diagrams were obtained. The results indicate that both NRTL and UNIQUAC models agree well with the experimental LLE data, whereas the NRTL model gives a better agreement than the UNIQUAC model for ternary (PODE1–4 + o-xylene + water) systems.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Liquid–Liquid Equilibrium for Ternary Systems of Polyoxymethylene Dimethyl Ethers + o-Xylene + Water at 293.15 K

Tian

Liu

2019

J. Chem. Eng. Data

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“…H 2 O management remains a key hurdle for the realization of a scalable OME 3-5 production. Research and development focused in the last decades on various H 2 O separation strategies, such as extraction [78][79][80][81][82][83][84][85], adsorption [76,86], or membranes [87]. The long-term stability of the materials applied for the previous concepts, as well as the efficiency and the scalability of these approaches are crucial for their application and remain under investigation.…”

Section: Introductionmentioning

confidence: 99%

Process Intensification Strategies for Power-to-X Technologies

et al. 2022

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Sector coupling remains a crucial measure to achieve climate change mitigation targets. Hydrogen and Power-to-X (PtX) products are recognized as major levers to allow the boosting of renewable energy capacities and the consequent use of green electrons in different sectors. In this work, the challenges presented by the PtX processes are addressed and different process intensification (PI) strategies and their potential to overcome these challenges are reviewed for ammonia (NH3), dimethyl ether (DME) and oxymethylene dimethyl ethers (OME) as three exemplary, major PtX products. PI approaches in this context offer on the one hand the maximum utilization of valuable renewable feedstock and on the other hand simpler production processes. For the three discussed processes a compelling strategy for efficient and ultimately maintenance-free chemical synthesis is presented by integrating unit operations to overcome thermodynamic limitations, and in best cases eliminate the recycle loops. The proposed intensification processes offer a significant reduction of energy consumption and provide an interesting perspective for the future development of PtX technologies.

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“…34 Thus, the effects of hydrophobic property of acid catalyst on the process of methanol and formaldehyde aqueous solution to PODE have been investigated in this paper. The experimental results exhibited that the hydrophilic catalysts present excellent performance for the reaction of methanol and formaldehyde to methylal because of the hydrophilic property of methanol and formaldehyde.…”

Section: Introductionmentioning

confidence: 99%

“…However, the hydrophilic catalysts show limited performance for the process of methylal to PODE 2 and the process of PODE n to PODE n + 1 because of the hydrophobic properties of methylal and PODE. 34 Thus, the effects of hydrophobic property of acid catalyst on the process of methanol and formaldehyde aqueous solution to PODE have been investigated in this paper.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a hydrophobic-hydrophilic adjustable catalyst surface for the controlled synthesis of polyoxymethylene dimethyl ethers: A potential replacement of diesel fuel

Zhang

Liu

2017

Int J Energy Res

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Summary Polyoxymethylene dimethyl ethers (PODE) are excellent promising diesel oil additives or replacements because of the special structure without carbon‐carbon bond. A novel solid dichlorodiphenylsilane‐modified ZrO2–γ‐Al2O3 catalyst with both hydrophobic and hydrophilic sites exhibited good catalytic activity and desired product selectivity for the reaction of methanol and formaldehyde aqueous solution to PODE. A single type of active center (only hydrophobic center or hydrophilic center) did not perform well for the PODE synthesize reaction from methanol and formaldehyde because of the different hydrophobic properties of methanol, formaldehyde, methylal, and PODE. The experimental results confirmed that the hydrophobic sites and hydrophilic sites of the catalyst surface promote the synthesis of PODE and methylal, respectively. The enhancement of the hydrophobic property of the catalyst surface promotes the production of long chain PODE. Further study indicated that the product distribution can be controlled artificially by adjusting the content of hydrophobic agent, and the desired polymerization degree of PODE can be optimally synthesized by a modified catalyst (called HYB‐26.9@ZrO2–γ‐Al2O3). Reaction temperature and pressure were also investigated for the PODE synthesis reaction with this modified catalyst, HYB‐26.9@ZrO2–γ‐Al2O3. Low reaction temperature benefits the synthesis of long chain PODE because of the limit of reaction equilibrium. The stability of the catalyst was proven by a 240‐hour running test.

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Liquid–liquid equilibria for ternary systems polyoxymethylene dimethyl ethers + para-xylene + water

Cited by 18 publications

References 21 publications

Liquid–Liquid Equilibrium for Ternary Systems of Polyoxymethylene Dimethyl Ethers + o-Xylene + Water at 293.15 K

Liquid–Liquid Equilibrium for Ternary Systems of Polyoxymethylene Dimethyl Ethers + o-Xylene + Water at 293.15 K

Process Intensification Strategies for Power-to-X Technologies

Preparation of a hydrophobic-hydrophilic adjustable catalyst surface for the controlled synthesis of polyoxymethylene dimethyl ethers: A potential replacement of diesel fuel

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