Mineral oils: processes and products – Fractionation – Liquid extraction with solvents
Reexamination Certificate
2011-01-18
2011-01-18
Hill, Jr., Robert J (Department: 1774)
Mineral oils: processes and products
Fractionation
Liquid extraction with solvents
C208S321000, C208S325000, C208S326000, C208S330000, C208S331000, C208S333000, C208S334000
Reexamination Certificate
active
07871514
ABSTRACT:
Extractive distillation processes whereby water-soluble extractive distillation (ED) solvents are regenerated and recovered employ improved operations of the extractive distillation column (EDC) so that polar hydrocarbons are recovered and purified from mixtures containing polar and less polar hydrocarbons and measurable amounts of hydrocarbons that are heavier than intended feedstock and/or polymers that are generated in the ED process. The improved process can effectively remove and recover the heavy hydrocarbons and/or remove polymer contaminants from the solvent in a closed solvent circulating loop through mild operating conditions with no additional process energy being expended. With the improved process, the overhead reflux of the EDC may be eliminated to further reduce energy consumption and to enhance the loading and performance within the upper portion of the EDC, especially when two liquid phases exists therein.
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Chen Zong-Ying
Chiu Tsung-Min
Hwang Jyh-Haur
Kuo Tung-Hsiung
Lee Fu-Ming
AMT International Inc.
Cascio & Zervas
CPC Corporation, Taiwan
Hill, Jr. Robert J
McCaig Brian
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