Ethylene glycol (EG) is proposed as an entrainer for the separation of methylal and methanol by extractive distillation. The COSMO-RS model was used to screen the suitable entrainer in terms of selectivity and solvent capacity. EG is a suitable entrainer with a low environmental impact. Vapor–liquid equilibrium (VLE) experiments demonstrated that the relative volatility of methylal to methanol is significantly improved using EG as an entrainer. The new corresponding interaction parameters were obtained by correlating the VLE data using the UNIFAC model, and then they were introduced into the process simulation software. The extractive distillation process was simulated using the rigorous equilibrium stage model. The optimal operating conditions were obtained by sensitivity analysis. The simulation results showed that EG is effective and efficient for the separation of methylal and methanol. In addition, the COSMO-RS model provides some theoretical insights into the separation mechanism.
Peng Yang,Guixia Zhong,Juanchun Yang,Linyu Zhao,Ding Sun,Yaqin Tian,Ruren Li,Liangyan Rong
Understanding the interrelationships between the differentially abundant microorganisms and metabolites of traditional “Fuet” fermented sausages (FSs) and inoculated fermented sausages (IFSs) can help us identify key species that are missing from commercial starter cultures to reproduce the flavor compounds and nutrients of traditional Fuet FSs. IFSs, inoculated with P. pentosaceus , P. acidilactici , S. xylosus , S. carnosus (SBM-52) or P. pentosaceus , and S. xylosus (THM-17), were deficient in reproducing the volatilome profile (in particular esters, methyl aldehydes, and methyl ketones) of traditional Fuet FSs because of the lack of diverse Staphylococci ( S. carnosus , S. xylosus , S. equorum , and S. saprophyticus ). Moreover, the combination of Pediococcus and Staphylococcus were positively associated with amino acid, fatty acid, l -anserine, and l -carnosine levels. Pyridoxal and indolelactic acid levels were significantly increased in IFSs with the addition of P. acidilactici and S. carnosus , which were positively associated with vitamin B 6 and tryptophan metabolic pathways.
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