Method for separating dimethyl carbonate from methanol
AssigneesChina Petroleum & Chemical Corporation, Shanghai Research Institute of Petrochemical Technology, Sinopec
InventorsWeimin Yang, Jun Li, Wenjun He, Junwei Ge, Jiahua Wang, Taikang Fei
Life of this patent
Estimating the term…
Abstract
A method for separating dimethyl carbonate from methanol includes subjecting a raw material containing dimethyl carbonate and methanol to extractive distillation. The extractant contains an ionic liquid and a compound having a general formula of CH3O(CH2CH2O)nCH3, n being an integer of 2-8. The ionic liquid is an imidazole ionic liquid, a pyridine ionic liquid, or a mixture thereof.
Claims18
A method for separating dimethyl carbonate from methanol, comprising:
- subjecting a raw material containing dimethyl carbonate and methanol to extractive distillation, wherein an extractant comprises at least one compound having a formula of CH3O(CH2CH2O)nCH3, n being an integer of 2-8, and an ionic liquid comprising a compound chosen from 1-hexyl-3-methylimidazolium hexafluorophosphate ([hmim][PF6]), 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), N-butylpyridinium hexafluorophosphate ([bpy][PF6]), 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([emim][NTf2]), 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([bmim][NTf2]), 1-butylpyridinium bis(trifluoromethylsulfonyl)imide ([bpy][NTf2]), 1-hexyl-3-methylimidazolium tetrafluoroborate ([hmim][BF4]), or n-butylpyridinium tetrafluoroborate ([bpy][BF4]),
- wherein the extractant further comprises 10-40 wt % of diethylene glycol dimethyl ether, 20-60 wt % of triethylene glycol dimethyl ether, and 10-40 wt % of tetraethylene glycol dimethyl ether.
A method for separating dimethyl carbonate from methanol, comprising:
- subjecting a raw material containing dimethyl carbonate and methanol to extractive distillation, wherein an extractant comprises at least one compound having a formula of CH3O(CH2CH2O)nCH3, n being an integer of 2-8, and an ionic liquid comprising a compound chosen from 1-hexyl-3-methylimidazolium hexafluorophosphate ([hmim][PF6]), 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), N-butylpyridinium hexafluorophosphate ([bpy][PF6]), 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([emim][NTf2]), 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([bmim][NTf2]), 1-butylpyridinium bis(trifluoromethylsulfonyl)imide ([bpy][NTf2]), 1-hexyl-3-methylimidazolium tetrafluoroborate ([hmim][BF4]), or n-butylpyridinium tetrafluoroborate ([bpy][BF4]),
- wherein the extractant further comprises a compound chosen from diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, hexaethylene glycol dimethyl ether, heptaethylene glycol dimethyl ether, or octaethylene glycol dimethyl ether, and
- wherein the extractant further comprises triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, and hexaethylene glycol dimethyl ether, wherein an average relative molecular weight of the extractant ranges from 240 to 270.
Dependencies are inferred from the claim text.