Gas separation: processes – With control responsive to sensed condition – Concentration sensed
Patent
1992-11-12
1994-04-12
Spitzer, Robert
Gas separation: processes
With control responsive to sensed condition
Concentration sensed
95 97, 95132, B01D 5304
Patent
active
053021878
DESCRIPTION:
BRIEF SUMMARY
APPLICATION FIELD IN INDUSTRY
This invention relates to a process for concentrating chlorine by making use of the pressure swing adsorption process.
PRIOR ART
Chlorine is a very important industrial intermediate material so that it is used in a wide variety of chemical industries. Hence, installations for the separation and concentration of chlorine are scattered in wide areas.
In order to separate chlorine from a chlorine-containing gas, it has been known to date to compress and cool the gas to produce liquid chlorine for its separation from the gas, or to allow a chlorine-containing organic solvent to absorb chlorine and strip the chlorine-absorbed solvent to separate the chlorine.
However, the former process deals with high pressure gases, necessitating gas compressors and cooling facilities which are expensive as well as troublesome in maintenance. Particularly, where chlorine is separated from a gas of relatively low chlorine concentration, a very high pressure or extremely low temperature operation is needed, demanding increased equipment costs. Further, the latter process generally employs a solvent of carbon tetrachloride, the use of which tends to be prohibited in recent years due to the environmental issues caused by freon gas, so that the process may not be said useful even in the future.
PROBLEMS TO BE SOLVED BY THE INVENTION
Where chlorine is separated from a chlorine-containing gas in such ways, particularly when it is separated from a gas of relatively low chlorine concentration, no effective process is found in the existing state of art. The present invention lies in providing a process for separating chlorine from a chlorine-containing gas and concentrating the chlorine, which is not restricted by the law dealing with high pressure gases and is free from the environmental issues caused by solvents.
MEANS TO SOLVE THE PROBLEMS
As a means often employed for separating gases, there is cited the pressure swing adsorption process, which is commonly used to increase the purities of oxygen
itrogen and carbon monoxide/hydrogen. Prior art has been studied previous to the examination, but no prior literatures/art are found with regard to chlorine.
Then, the present inventors have made intensive investigations into the separation of chlorine from a chlorine-containing gas by means of pressure swing adsorption and finally found that the chlorine can be separated effectively by the use of zeolite, active carbon and non-zeolite-type porous acidic oxides as the adsorbent, leading to completion of the present invention.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a schematic drawing of a facility in which a plural number of adsorption columns (4a, 4b and 4c) are used for the purpose of practicing the present invention particularly in a continuous manner. The feed gas is sent to an adsorption column by a compressor 2 through line 1, and the gas having chlorine removed in the adsorption column is sent out of the system by a blower 7. On the other hand, the gas of an increased chlorine concentration evolved by desorption is sent to the outside of the system by a vacuum pump 10. Numeral 8 is a flow control mechanism, while numerals 3, 5, 9, 11, 12a, 12b and 14 to 21 represent valves.
BEST MODE FOR PRACTICING THE INVENTION
The present invention relates to a process for concentrating gaseous chlorine, which comprises introducing a chlorine-containing gas into an adsorption column packed with a chlorine-adsorbable adsorbent to adsorb particularly chlorine, stopping then the introduction of the gas and reducing the pressure of the adsorbent to a lower pressure than that employed in the introduction of the gas for the adsorption to desorb the gaseous chlorine having been adsorbed, thereby obtaining a gas with a chlorine concentration higher than that of the introduced gas and simultaneously regenerating the adsorbent, the thus-regenerated adsorbent being optionally used again for the aforesaid chlorine adsorption.
The chlorine-containing gas to which the process of the present invention is applied
REFERENCES:
patent: 1617305 (1927-02-01), Guyer et al.
patent: 2340398 (1944-02-01), MacMullin
patent: 2800197 (1957-07-01), Wynkoop
patent: 3001607 (1961-09-01), Eng et al.
patent: 3029575 (1962-04-01), Eng et al.
patent: 3038326 (1962-06-01), DeFord
patent: 3063218 (1962-11-01), Pernert et al.
patent: 3197942 (1965-08-01), Haisty et al.
patent: 3224167 (1965-12-01), Jones
patent: 3658467 (1972-04-01), Maeck
patent: 4127395 (1978-11-01), McKey et al.
patent: 4264339 (1981-04-01), Juntgen et al.
patent: 4557921 (1985-12-01), Kirsch et al.
patent: 4684377 (1987-08-01), Haruna et al.
patent: 4748013 (1988-05-01), Saito et al.
patent: 4762537 (1988-08-01), Fleming et al.
patent: 4902312 (1990-02-01), Chang
patent: 4980139 (1990-12-01), Bosserman et al.
patent: 5051117 (1991-09-01), Prigge et al.
Hirayama Teruo
Itoh Hiroyuki
Kikuchi Isao
Kono Yoshitsugu
Takenaka Shinji
Mitsui Toatsu Chemicals Incorporated
Spitzer Robert
LandOfFree
Concentration process of gaseous chlorine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Concentration process of gaseous chlorine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Concentration process of gaseous chlorine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2095602