Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Including plural reaction stages
Reexamination Certificate
2011-01-06
2011-12-20
Griffin, Walter D (Department: 1774)
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Including plural reaction stages
C422S129000, C422S131000, C422S138000, C422S600000, C422S608000, C422S616000, C568S868000
Reexamination Certificate
active
08080222
ABSTRACT:
In an apparatus for the recovery of ethylene glycol in a polyethylene terephthalate(PET) production process water accumulating in the esterification reaction is mixed with a process fluid containing 2-methyl-1,3-dioxolane (MDO). The mixing is carried out in a tank upstream of a rectification column. Through the increase in the water content in the fluid, a shift in the reaction equilibrium takes place and consequently a cleavage of the 2-methyl-1,3-dioxolane present into ethylene glycol and acetaldehyde takes place. Following the cleavage reaction, the mixture is fed from the tank into a rectification column, whereby the ethylene glycol produced from the cleavage reaction is returned to the PET production process.
REFERENCES:
patent: 4146729 (1979-03-01), Goodley et al.
patent: 5236558 (1993-08-01), Buyalos et al.
patent: 2010/0041925 (2010-02-01), Reimann et al.
patent: WO 96/35654 (1996-11-01), None
Machine translation of WO 1996/035654 A1, which was published Nov. 1996.
Ambrassat Rolf
Reimann Randolf
Griffin Walter D
Wilford Andrew
Young Natasha
Zimmer Lurgi
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