Chemistry of inorganic compounds – Oxygen or compound thereof – Superoxide or ozone
Patent
1986-12-19
1988-11-22
McFarlane, Anthony
Chemistry of inorganic compounds
Oxygen or compound thereof
Superoxide or ozone
423219, 423351, 204176, 55 68, 55 74, C01B 1310
Patent
active
047864893
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an ozone-producing process of the type in which oxygen circulating in an ozonization loop is partly ozonized in a ozonizer and then the ozone is trapped by adsorption and desorbed by a substitution gas.
An object of the invention is to provide improvements in the known processes of this type so as to reduce the investment costs in particular for the production of large quantities of ozone, for example on the order of 1,800 kg/h of ozone.
For this purpose, the invention provides a process of the aforementioned type characterised in that it comprises: sending the oxygen-ozone mixture into a first adsorbent mass, in a cocurrent direction, where the ozone is adsorbed; simultaneously sending into a second adsorbent mass in a countercurrent manner a carrier gas flow serving for the desorption of this second mass; simultaneously effecting a scavenging of a third adsorbent mass by passing through this third adsorbent mass a scavenging gas flow taken from the loop, each adsorbent mass being traversed in succession by the oxygen-ozone mixture, the carrier gas and the scavenging gas; and associating with the carrier gas flow the scavenging gas flow which has passed through the third adsorbent mass.
Some embodiments of the invention will now be described with reference to the accompanying drawings, in which:
FIG. 1 is a simplified diagram of an ozone-producing plant for practicing a process according to the invention;
FIG. 2 is a diagram illustrating the operation of this plant;
FIG. 3 is simplified diagram of another ozone-producing plant for practicing a process according to the invention;
FIG. 4 is a diagram illustrating the operation of the plant of FIG. 3;
FIGS. 5A and 5B together diagrammatically represent a complete plant corresponding to the diagram of FIG. 3;
FIGS. 6 and 7 repeat in more detail the diagram of FIG. 1 according to two embodiments;
FIG. 8 is a cross-sectional view of the top of a plant for carrying out a process according to the invention, this view being taken along line VIII--VIII of FIG. 10;
FIG. 9 is a view similar to FIG. 8 but of a modification thereof;
FIGS. 10 and 11 represent the plant of FIG. 8 or of FIG. 9 in a longitudinal section respectively taken along lines X--X and XI--XI of these figures;
FIG. 12 shows the use of an apparatus such as shown in FIGS. 8 to 11 in a plant according to FIG. 6;
FIG. 13 is a longitudinal sectional view of another apparatus for carrying out a process according to the invention;
FIGS. 14 to 17 are sectional views respectively taken along lines XIV--XIV to XVII--XVII of FIG. 13; and
FIG. 18 is a view similar to FIG. 13 of a modification.
FIG. 19 is a longitudinal sectional view of another apparatus for carrying out a process according to the invention;
FIG. 20 is a sectional view taken along line XX--XX of FIG. 19; and FIG. 21 is a detailed sectional view of a portion of the apparatus of FIG. 19.
FIG. 1 is a simplified view of a plant for producing ozone from oxygen having a single ozonization loop 1. This plant essentially comprises a "Roots" compressor 2, an ozonizer 3 of any suitable type and three adsorption cylinders 4,5,6 filled with silica gel.
At each instant, oxygen circulates in the loop 1 in the following manner: the oxygen, compressed from 1.3 bars (1 bar=an absolute pressure of 10.sup.5 Pa) to 1.5 bars by the compressor 2, is partly ozonized by the ozonizer 3, from which issues an oxygen-ozone mixture having about 3% by volume of ozone; this mixture passes through a heat exchanger 8 and enters, from the bottom, one of the three cylinders, for example the cylinder 4 in which the ozone is trapped by adsorption, the circulation occurring in a cocurrent direction; and the oxygen issuing from the top of the cylinder 4 returns via heat exchanger 8 to the compressor.
Further, a carrier gas, which may be impure nitrogen (mixed with oxygen) or dry air and which will be hereinafter termed "nitrogen" for the sake of convenience, enters through a conduit 9 in a countercurrent manner another cylinder, for example the cylin
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Grenier Maurice
Petit Pierre
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
McFarlane Anthony
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