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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Distribution network planning is to guide the distribution network construction and management of key links, is the global energy Internet construction is an important work. In this paper, the key factors influencing the quality of distribution network are analyzed by using fish bone diagram analysis method, and then the Delphi expert consultation method and fuzzy analytic hierarchy process are used to determine the quality index of distribution network planning. This indicator can not only fully reflect the quality of distribution network planning, but also can carry out longitudinal evaluation and horizontal comparison of the actual situation of distribution network in different regions, find out the weak links of regional distribution network, guide the development of future distribution network direction.