Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1985-03-07
1986-09-16
Hart, Charles
Gas separation
Means within gas stream for conducting concentrate to collector
55196, 175 66, B01D 1900
Patent
active
046120211
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to the contact and mass transfer of gas into a liquid with particular application to extract dissolved oxygen from sea water by dissolving nitrogen in its place. The de-oxygenated sea water is then pumped into oil wells drilled in the sea bed.
BACKGROUND ART
In many industrial processes, a gas and a liquid are brought into intimate contact to achieve a transfer of solute gas to or from the liquid solvent.
Gas-liquid reactions with absorption and desorption are widely used in five main fields of the chemical industry, namely: monoxide, etc.
Typical examples of the equipment used for such reactions are packed columns, spray columns, plate columns or mechanically agitated vessels. The present invention is concerned with new apparatus which has been developed for the desorption of a gas using a liquid phase process where one gas is replaced in solution by another.
Known apparatus for extracting a dissolved first gas from a liquid comprises a liquid conduit for conveying the liquid; gas/liquid contacting means for dissolving a second gas in the liquid to replace the first gas; and separating means for collecting and removing the first gas driven out of solution from the liquid.
Usually, such a reaction would take place in a packed column, where the column packing is designed to provide a large interface area through which mass transfer can take place. Packed columns must therefore be large to provide sufficient interface area. Such large pieces of equipment can be expensive to manufacture and involve high installation costs. In certain applications, such as North Sea oil rigs, the large size of packed columns can add significantly to the cost of a complete platform.
DISCLOSURE OF THE INVENTION
According to one aspect of the invention there is provided apparatus for extracting a dissolved first gas from a liquid, including a liquid conduit for conveying the liquid; main gas ejector means provided in the liquid conduit and supplied with a second gas for dissolving the second gas in the liquid to replace the first gas; separation means for receiving liquid and a mixture of free first and second gases discharging from the liquid conduit and for separating said mixture from the discharged liquid; and cleaning means for receiving separated mixture from said separation means and for removing first gas from the received mixture; said cleaning means being connected to said main gas ejector means and said main gas ejector means being operable to provide sufficient suction to draw separated mixture of said first and second gases from said separation means to said cleaning means.
According to another aspect of the invention there is provided a method of extracting a dissolved first gas from a liquid, including the steps of passing the liquid through a liquid conduit;
dissolving a second gas in the liquid to replace the dissolved first gas by passing the liquid through main gas ejector means provided in the liquid conduit and supplied with the second gas for mixing the second gas with the liquid;
discharging liquid and a mixture of free first and second gases from said conduit into separation means and separating said mixture from the discharged liquid with said separation means;
conveying at least part of this mixture from the separation means to cleaning means and removing first gas from the conveyed mixture with said cleaning means, said cleaning means being connected to said main gas ejector means; and operating said main gas ejector means in such a manner as to provide sufficient suction to draw separated mixture of said first and second gases from the separation means and into the cleaning means.
An example of the invention will be described hereinafter with reference to the accompanying drawing which is a schematic arrangement of apparatus for removing oxygen from sea water by replacing the dissolved oxygen with nitrogen.
In use of the apparatus, for gas stripping, the volume of second gas consumed should be kept to a minimum and this may be achieved by recycling all or pa
REFERENCES:
patent: 3815330 (1974-06-01), Lawley
patent: 4023941 (1977-05-01), Miller
patent: 4136747 (1979-01-01), Mallory et al.
patent: 4415341 (1983-11-01), Echtler
Bland Sarah E. L.
Palmer Murray H.
LandOfFree
Contacting a gas and a liquid to remove an unwanted gas does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Contacting a gas and a liquid to remove an unwanted gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contacting a gas and a liquid to remove an unwanted gas will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1993471