Claims
- 1. A method of making a filtering material capable of removing chlorine from a chlorine-containing gaseous stream which comprises:
- preparing a solution of a hydroxide and distilled water in the proportion of about 0.1-0.3 kg hydroxide per 1 liter of distilled water, said hydroxide selected from the group consisting of sodium hydroxide and potassium hydroxide;
- mixing hopcalite prepared by the carbonate method into said solution while maintaining the temperature at not more than 170.degree. F., said hopcalite added to said solution in an amount of about 1 kg per each liter of distilled water;
- allowing the mixture to stand for at least 30 minutes;
- decanting off any excess solution;
- air drying the treated hopcalite to remove surface moisture;
- sieving said treated hopcalite through a 10 mesh screen and retaining said treated hopcalite passing through said screen;
- baking said retained treated hopcalite at ambient pressures for a period of from 1 to 2 hours at a temperature of from 240.degree. to 260.degree. F.;
- further baking said treated hopcalite at a vacuum of at least 28 inches of mercury for a period of from 8 to 16 hours at a temperature of from 240.degree. to 260.degree. F. to a moisture content of less than about 2 percent to provide a treated hopcalite having a high surface area in the range of 100 m.sup.2 /gm; and
- removing said treated hopcalite to a sealed container.
- 2. The method as defined by claim 1 wherein said screened hopcalite is further sieved through a 20 mesh screen, with the hopcalite retained on said 20 mesh screen retained for further treatment.
- 3. The method as defined by claim 1 further comprising heating the hopcalite for a period of from 16 to 18 hours at 700.degree. F..+-.10.degree. F. and cooling to room temperature prior to admixing said hopcalite with said hydroxide solution.
- 4. A process for the removal of chlorine from gases containing chlorine in initial amounts of greater than about 2000 ppm, said process including the steps of:
- providing a housing;
- disposing a chlorine getter within said housing, said chlorine getter consisting essentially of a treated carbonate method hopcalite produced in accordance with the method of claim 1;
- passing said chlorine-containing gas through said housing; and
- removing chlorine therefrom.
- 5. A process for the removal of chlorine from gases containing chlorine in initial amounts of greater than about 2000 ppm, said process including the steps of:
- providing a housing;
- disposing a chlorine getter within said housing, said chlorine getter consisting essentially of a treated carbonate method hopcalite produced in accordance with the method of claim 3;
- passing said chlorine-containing gas through said housing; and
- removing chlorine therefrom.
Parent Case Info
This is a divisional of co-pending application Ser. No. 796,720 filed on Nov. 8, 1985 U.S. Pat. No. 4,687,640.
US Referenced Citations (7)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0109227 |
Jun 1984 |
JPX |
0097027 |
May 1985 |
JPX |
Non-Patent Literature Citations (3)
Entry |
Kirk-Othmer, "Encyclopedia of Chemical Technology", vol. 1, Third Ed., p. 655; vol. 167, pp. 675-676. |
Etienne Cheylan, Chemical Abstracts, 40, 5986. |
Bailar et al., "Chemistry", p. 421, (Academic Press). |
Divisions (1)
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Number |
Date |
Country |
Parent |
796720 |
Nov 1985 |
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