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Ionic liquid-based green process engineering for co-production of ethylene glycol and dimethyl carbonate


 As a significant synthetic, dimethyl carbonate (DMC) has one of a kind physical properties and adaptable reactivity. It has been broadly utilized as a dissolvable, fuel added substance and lithium battery electrolyte. In addition, DMC can be viewed as a green carbonylation reagent and methylation reagent to supplant exceptionally harmful phosgene, methyl chloroformate and dimethyl sulfate. These days, the DMC request is expanding and thusly, effective and cheap manufactured convention for this substance is profoundly attractive. The detailed manufactured strategies for dimethyl carbonate, including phosgene course, methanol oxidative carbonylation, urea alcoholysis, direct combination from CO2 and methanol, and transesterification, were summed up in Scheme 1. Wherein, the conventional phosgene course has these days been restricted because of its harmfulness and wellbeing issue. For the oxidative carbonylation procedure of CO and methanol, the costly gasification forms and the utilization of hazardous material make the procedure non-liked. Ethylene glycol (EG) as one of mass synthetic substances and dimethyl carbonate (DMC) as natural cordial concoction materials have vital essentialness for the fundamental businesses and new enterprises. The improvement of green procedure designing for coproduction of EG and DMC is profoundly required as the customary courses include either high vitality utilization or harmful material. The effective mechanical ionic fluid based green procedure designing has a few points of interest. To start with, the bolstered ionic fluid dependent on synergistic reactant impact in a fixed bed keeps away from vitality utilization and the loss of impetus, contrasted and conventional procedures in which the detachment of ethylene carbonate and impetus cost a great deal of vitality. Second, receptive refining breaks the harmony of the transesterification response and changes over all ethylene carbonate, consequently improving transformation. This is more clear than utilizing a progression of fixed bed reactors and ethylene carbonate hydration reactor. Third, vitality utilization is diminished (20%~30%) because of the warmth incorporation framework contrasted and customary procedure of the coproduction of propylene glycol and dimethyl carbonate. At last, CO2 discharged from the upstream of ethylene oxidation plant is used in the new procedure, a major bit of leeway from a biological perspective, contrasted and conventional procedure of the hydration of ethylene oxide. This green substance building innovation has been pushed to commercialization. A 33,000 t/a, modern plants are currently effectively working. In light of its monetary expense and natural benevolent, the new procedure is accepted to be a serious innovation for delivering ethylene glycol and dimethyl carbonate.
Weiguo Cheng