Method of distilling dimethyl sulfoxide and multistage distillation tower
AssigneeToray Fine Chemicals Co., Ltd.
InventorsRyoji Ichioka, Haruo Murano
Life of this patent
Estimating the term…
Abstract
A method of distilling a liquid containing dimethyl sulfoxide using a distillation system, including mixing sodium carbonate with a liquid containing dimethyl sulfoxide at a bottom of the distillation system such that sodium carbonate accounts for 0.005% to 25% by weight relative to 100% by weight of the liquid containing dimethyl sulfoxide and sodium carbonate in total at the bottom of the distillation system and heating the bottom; and obtaining a distillate containing dimethyl sulfoxide at a position lower than a position at which the liquid containing dimethyl sulfoxide is introduced and higher than a position of the heating portion.
Claims13
A method of distilling a liquid containing dimethyl sulfoxide using a single multistage distillation tower, comprising:
- (1) contacting sodium carbonate and a liquid containing dimethyl sulfoxide at a bottom portion of the distillation system such that sodium carbonate accounts for 0.005% to 25% by weight relative to 100% by weight of the liquid containing dimethyl sulfoxide and sodium carbonate in total at the bottom portion of the single multistage distillation tower and heating the bottom portion with a heater, wherein sodium carbonate is directly added at the bottom Portion of the single multistate distillation tower;
- and
- (2) obtaining a distillate containing dimethyl sulfoxide at a position lower than a position at which the liquid containing dimethyl sulfoxide is introduced and higher than a position of the heater.
A multistage distillation tower that distills a liquid containing dimethyl sulfoxide, which is a single multistate distillation tower, comprising:
- an apparatus that directly adds sodium carbonate at the bottom portion of the single multistate distillation tower, and
- a system that contacts the sodium carbonate with a liquid containing dimethyl sulfoxide at the bottom portion of the distillation tower and heats the bottom portion with a heater, while controlling the concentration of sodium carbonate to 0.005% to 25% by weight relative to 100% by weight of the liquid containing dimethyl sulfoxide and sodium carbonate in total at the bottom portion of the single multistate distillation tower, and
- a side cut that allows a distillate containing dimethyl sulfoxide to flow out at a position lower than a position of a supply stage that supplies a liquid containing dimethyl sulfoxide and higher than a position of the heater.
Dependencies are inferred from the claim text.