Chemistry of hydrocarbon compounds – Purification – separation – or recovery – By addition of extraneous agent – e.g. – solvent – etc.
Reexamination Certificate
2006-07-18
2006-07-18
Nguyen, Tam M. (Department: 1764)
Chemistry of hydrocarbon compounds
Purification, separation, or recovery
By addition of extraneous agent, e.g., solvent, etc.
C585S857000, C585S860000, C208S313000, C208S321000, C208S323000, C208S326000, C208S330000
Reexamination Certificate
active
07078580
ABSTRACT:
This application relates to a composite solvent for separating aromatics by extractive distillation, comprising a main solvent, a solutizer and a modifier. Said solutizer is selected from any one or mixtures of any two of C8–C11aromatics having different number of carbon atoms, the content of which is 3–39 wt %, and the number of carbon atoms of the lowest aromatic in the solutizer should be greater than that of the highest aromatic in the aromatics to be separated. When the solutizer is selected from any one of C8–C11aromatics, the composite solvent contains 0.01–10.0 wt % of the modifier; when the solutizer is selected from mixtures of any two of C8–C11aromatics having different number of carbon atoms, the composite solvent contains 0–10.0 wt % of the modifier. Said main solvent and modifier are independently selected from sulfolane derivatives, N-formyl morpholine, and N-methyl pyrrolidone, provided that the acidity and basicity of the modifier are opposite to those of the main solvent. When the composite solvent is used to recover aromatics by extractive distillation, it is possible to moderate the operation conditions of solvent recovery, increase the yield of aromatics, and make the separated aromatics to be neutral.
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English Language Abstract of CN1262264.
English Language Abstrcat of E.P.O.0418622.
English Language Abstract SU 859344.
Bian Zhifeng
Sun Huixia
Tang Wencheng
Tian Longsheng
Wu Shijin
China Petroleum & Chemical Corporation
Nguyen Tam M.
Research Institute of Petroleum Processing Sinopec
Scully , Scott, Murphy & Presser, P.C.
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