Appeal No. 1998-1009
Application No. 08/656,733
identified application.
Claim 1 is representative of the subject matter on
appeal and reads as follows:
1. A process for cooling, demonomerizing and
dedusting gas containing thermoplastic polymer dust,
monomers and water from a thermoplastic polymer
drier, comprising the steps of:
(a) directing an exhaust stream from a
thermoplastic polymer drier, which exhaust stream
contains polymer dust, monomers and water into a
column which houses a packing;
(b) within the column, washing the exhaust
stream with a solvent selected from the group
consisting of water, alcohols, amines, organic and
inorganic acids, esters, ketones, ethers, paraffins
and mixtures thereof, to achieve substantial
cooling, dedusting and demonomerization of the
exhaust stream in a single washing step; and
(c) exiting the substantially cooled, dedusted
and demonomerized exhaust stream from the column.
The examiner relies on the following prior art
references:
Bolle 2,952,675 Sep. 13,
1960
Braun et al. (Braun) 3,047,565 Jul. 31,
1962
Bergman 3,353,334 Nov. 21,
1967
Scoggin 4,043,773 Aug. 23,
1977
Shimoi et al. (Shimoi) 4,425,285 Jan 10,
2
Page: Previous 1 2 3 4 5 6 7 Next
Last modified: November 3, 2007