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US 7,094,917 B2Granted
Processes for refining compositions containing dialkyl carbonates
AssigneeCognis Deutschland GmbH & Co. KG
InventorsRichard Ridinger, Levent Yueksel, Georg Fieg
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Abstract
Processes for refining dialkyl carbonate-containing compositions are described, wherein a composition comprising a dialkyl carbonate is provided; and the composition is subjected to a rectification wherein low-boiling impurities are removed, and a rectification wherein high-boiling impurities are removed; and subsequently to a deodorization wherein medium-boiling impurities are removed.
Claims15
A process comprising the steps of:
- (a) providing a composition comprising a dialkyl carbonate formed by transesterification of a C1-4 dialkyl carbonate with a C6-22 alcohol;
- (b) subjecting the composition to a rectification wherein low-boiling impurities are removed an a bottom product remains;
- (c) subjecting the bottom product to a rectification wherein high-boiling impurities are removed and a destillate remains;
- and subsequently
- (d) subjecting the distillate to a deodorization wherein medium-boiling impuritips are removed.
2 more elements
A process comprising the steps of:
- (a) providing a composition comprising a dialkyl carbonate reaction product mixture prepared by transesterification of a C1-4 dialkyl carbonate with a C6-22 alcohol;
- (b) subjecting the composition to a first rectification carried out at a temperature of from 180 to 250° C. and at a pressure of from 0.01 to 10 mbar wherein low-boiling impurities are removed and a bottom product remains,
- (c) subjecting the bottom product to a second rectification carried out at a temperature of from 150 to 250° C. and at a pressure of from 0.01 to 0.5 mbar wherein high-boiling impurities are removed and a distillate remains;
- and subsequently
- (d) subjecting the distillate to a deodorization carried out in a column under a pressure of from 10 to 100 mbar wherein medium-boiling impurities are removed with a gas selected from the group consisting of steam and inert gases.
2 more elements
Dependencies are inferred from the claim text.