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US 5,685,957 AGranted
Method for removing acidic and salt impurities from an aqueous condensed phase containing dimethylcarbonate
AssigneeEnichem Synthesis S.p.A.
InventorsFranco Rivetti, Daniele Delledonne
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Abstract
Acidic and salt impurities are removed from a condensed phase obtained from dimethyl carbonate synthesis by obtaining the condensed phase from the effluent of a reactor in which carbon monoxide, oxygen and methanol are reacted to form dimethyl carbonate, the condensed phase containing acid and salt impurities, and partially evaporating the condensed phase in an evaporator thereby preparing an evaporated stream substantially free of impurities and a residual bottom stream.
Claims8
A method of removing hydrochloric acid and salt impurities from a process of synthesizing dimethyl carbonate comprising:
- obtaining a condensed phase from an effluent of a reactor in which carbon monoxide, oxygen and methanol are reacted to form dimethyl carbonate, said condensed phase containing hydrochloric acid and salt impurities;
- partially evaporating said condensed phase in an evaporator thereby producing an evaporated stream substantially free of hydrochloric acid and salt impurities and a bottom drain stream containing most of the hydrochloric acid and salt impurities, said evaporated stream constituting from 80 to 99% by wt. of the condensed phase passed into said evaporator;
- and
- distilling said evaporated stream in a distillation unit to obtain a purified dimethyl carbonate.
1 more element
Dependencies are inferred from the claim text.