Pyrrolidone is also utilized as a part of recovery of hydrocarbons in large-scale operations by extractive distillation
. Recovery of unadulterated hydrocarbons in petrochemical processing is predicted to drive the worldwide pyrrolidone market during the forecast horizon.
They address types of column internals and the advantages and disadvantages of equipment used for vapor-liquid contacting and separation; the features of the main types of vapor-liquid contactors, including distillation trays, random packings, and structure packings; equipment design, column configuration, and operation-related aspects of dividing-wall columns; the separation of azeotropic mixtures in extractive distillation
; reactive distillation; the features of vacuum and high-pressure distillation; and laboratory distillation and scale-up.
In 1938, Natta studied the production of synthetic rubber and was the first to accomplish physical separation of butadiene from 1-butadiene by a new method of extractive distillation
. His work on the strereospecific polymerization of polypropylene led to the development of isotactic polypropylene, first produced on an industrial scale for film, fiber, and resins uses in 1957.
, This is a similar process to the azeotropic.
They have been used to simulate distillation columns, absorbers, azeotropic and extractive distillation
operations (see the example below), cryogenic distillations, and liquid-liquid extraction [see reference 2 for literature citations].
These were the use of molecular sieves, extractive distillation
and operating under a vacuum to take advantage of the much improved relative volatility of acetone to water at lower temperatures.