Experimental and Correlated Liquid–Liquid Equilibrium Data for Ternary Systems (Water + Poly(oxymethylene) Dimethyl Ethers + Toluene) at T = 293.15 and 303.15 K and p = 101.3 kPa

Abstract

Poly­(oxymethylene) dimethyl ethers (PODE n ) are appealing additives for diesel fuels. Nowadays, the research on PODE n synthesis is crucial and essential, while the separation of PODE n from aqueous systems also has great significance for the production of PODE n in industry. In this work, ternary liquid–liquid equilibrium (LLE) data for the mixtures of (water + PODE1 + toluene), (water + PODE2 + toluene), (water + PODE3 + toluene), and (water + PODE4 + toluene) were determined at T = 293.15 and 303.15 K and p = 101.3 kPa. The consistency of experimental LLE data was evaluated by Hand and Othmer–Tobias equations. The distribution coefficients and separation factors were employed to assess the efficiency of extracting PODE1–4 from water. The experimental tie-line data of the studied systems were correlated using the Non-Random Two Liquid and Universal Quasi Chemical (UNIQUAC) activity coefficient models, while the corresponding binary interaction parameters were obtained with the results indicated that the UNIQUAC model gives a better agreement. All of the data demonstrated that toluene was an ideal extractant for separating PODE1–4 from aqueous solution.

A novel process towards the industrial realization of large-scale oxymethylene dimethyl ether production – COMET

“…The extractant is also separated and recycled back to the extraction. Various extractants were investigated in the literature showing that toluene, p -xylene and n -heptane enable promising liquid–liquid separation behaviors between OME and H 2 O, FA and MG. 46–52…”

“…The extractant is also separated and recycled back to the extraction. Various extractants were investigated in the literature showing that toluene, p-xylene and n-heptane enable promising liquid-liquid separation behaviors between OME and H 2 O, FA and MG. [46][47][48][49][50][51][52] Results of Li et al 47 show the separation of the OME synthesis product using toluene. About 70% of OME are separated in the organic phase and only 14% of FA and H 2 O migrate in the organic phase, as indicated by the split fraction.…”

Process Intensification Strategies for Power-to-X Technologies

“…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.…”