Cleaning and liquid contact with solids – Processes – Including regeneration – purification – recovery or separation...
Patent
1996-05-16
1998-06-16
Warden, Jill
Cleaning and liquid contact with solids
Processes
Including regeneration, purification, recovery or separation...
134 10, 134 38, B08B 704
Patent
active
057663700
ABSTRACT:
A process for recovering organic solvent material from a hydrophilic liquid derived from paint overspray treatment operations in which the solvent-in-water emulsion initially contains 1-50 weight percent of an organic liquid having a boiling point of at least 150.degree. C., a vapor pressure less than 0.5 Torr at 20.degree. C.; and water, and the spent hydrophilic liquid additionally contains paint solid material derived from the paint overspray treatment system in which the recovery process includes the steps of
(a) removing the spent hydrophilic liquid or a portion thereof from the paint spray booth;
(b) feeding the spent hydrophilic liquid into a reaction vessel, the reaction vessel operating at a pressure less than about 100 mm/Hg and at a temperature sufficient to volatilize the organic liquid component of the hydrophilic liquid; and
(c) separating a portion of said volatilized organic liquid from the spent hydrophilic liquid after introduction of the spent hydrophilic liquid into the reaction vessel. The organic liquid component is selected from the group which includes secondary alcohol esters, derivatives of secondary alcohol esters, dialkyl diesters of dibasic acids, and n-methyl pyrrolidones.
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Patzelt Robert R.
Randazzo Thomas
Markoff Alexander
Nortru, Inc.
Warden Jill
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