Chemistry of inorganic compounds – Miscellaneous process
Reexamination Certificate
1998-01-22
2003-09-30
Silverman, Stanley S. (Department: 1754)
Chemistry of inorganic compounds
Miscellaneous process
C366S241000, C406S197000, C406S198000, C422S129000, C422S205000, C422S209000, C422S227000, C422S239000, C422S271000, C422S273000
Reexamination Certificate
active
06627174
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an axial conveyor which is suitable in particular for the transport of liquid/gas dispersions, preferably with a self-priming gassing agitator, and a loop reactor containing the axial conveyor.
BACKGROUND OF THE INVENTION
Axial conveyors generally comprise, within a conveying channel taking the form of a tubular section, a drivable axle with obliquely pitched, wall-sweeping conveying vanes or screws. In the course of transport by means of axial conveyors, and in the direction of transport, a pressure zone develops below and a suction zone develops above the vanes or screws. The pressure gradient that is formed as a result in the gap between conveying tube (housing) and vanes or screws brings about a backflow of the medium to be conveyed. In the case of the transport of liquid/gas dispersions, separation of gas bubbles occurs as a result of the gap and hence, the conveying capacity falls. This effect is further intensified by virtue of the fact that the angular momentum impressed upon the liquid by rotation of the screw or of the vanes is retarded by the wall friction, so that the gas bubbles in the vicinity of the wall segregate in the direction towards the wall and coalesce on the wall. In the case of relatively high gas contents, this results in the collapse of the conveying capacity.
Axial conveyors are therefore suitable only for the transport of liquid/gas dispersions having gas contents of up to 5 vol-%.
SUMMARY OF THE INVENTION
An axial conveyor for conveying gas/liquid dispersions, comprising conveying elements, in a substantially cylindrical conveying tube, wherein said conveying elements are selected from the group consisting of propellers, vanes or screws disposed on a drivable axle, whereby said conveying elements comprise a wall-sweeping lip. A process comprising conveying gas/liquid dispersions as well as a process for carrying out chemical reactions comprising directly reacting gas with gases not completely dissolved in a liquid medium in an axial conveyor is also disclosed
REFERENCES:
patent: 1404709 (1922-01-01), Allbright
patent: 3349894 (1967-10-01), Allen et al.
patent: 3580419 (1971-05-01), Carter
patent: 4488838 (1984-12-01), Herud
patent: 4919849 (1990-04-01), Litz et al.
patent: 5084252 (1992-01-01), Cahill et al.
patent: 5520783 (1996-05-01), White et al.
patent: 5846498 (1998-12-01), Kingsley
patent: 1916528 (1969-11-01), None
patent: 7022424 (1971-06-01), None
patent: 4119308 (1992-12-01), None
patent: 43 27 727 (1995-02-01), None
patent: 43 22 824 (1995-12-01), None
patent: 0 480 501 (1992-04-01), None
patent: 2 697 870 (1994-05-01), None
Lueger, Lexikon der Technik, 4. Auflage, Deutsche Verlags-Anstalt Stuttgart, (month unavailable) 1970, pp. 389-391.
Hemmerle Wolfgang
Judat Helmut
Rose Reinhold
Bayer Aktiengesellschaft
Gil Joseph C.
Silverman Stanley S.
Vanoy Timothy C.
Whalen Lyndanne M.
LandOfFree
Axial conveyor and loop reactor containing said axial conveyor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Axial conveyor and loop reactor containing said axial conveyor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Axial conveyor and loop reactor containing said axial conveyor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3027298