11. While vacuum distillation of ethanol is not presently economical, pressure-swing distillation is a topic of current research. 12. This instability was due to traces of impurities ( Richard Wolffenstein, who produced it by vacuum distillation . 13. Utilizing vacuum distillation can reduce the height and diameter, and thus the capital cost of a distillation column. 14. They are refined by vacuum distillation . 15. This originated beneath a Vacuum Distillation column at a steam out point where maintenance was being carried out. 16. Another advantage of vacuum distillation is the reduced capital cost, at the expense of slightly more operating cost. 17. Industrial-scale vacuum distillation has several advantages. 18. It once was a popular laboratory method for purification of organic compounds, but has become obsolete by vacuum distillation . 19. The project includes a 70, 000-bbl / day vacuum distillation unit, a sulfur recovery unit and a lube oil hydrocracker. 20. Pure MMA ( > 99.9 % ) is produced from the crude MMA in a series of vacuum distillations and separations.
