US1743242A - Method of preserving dibasic calcium hypochlorite - Google Patents

Method of preserving dibasic calcium hypochlorite Download PDF

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Publication number
US1743242A
US1743242A US208410A US20841027A US1743242A US 1743242 A US1743242 A US 1743242A US 208410 A US208410 A US 208410A US 20841027 A US20841027 A US 20841027A US 1743242 A US1743242 A US 1743242A
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calcium hypochlorite
dibasic calcium
preserving
dibasic
salt
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US208410A
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Hermann S Schultze
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IG Farbenindustrie AG
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IG Farbenindustrie AG
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B11/00—Oxides or oxyacids of halogens; Salts thereof
    • C01B11/04—Hypochlorous acid
    • C01B11/06—Hypochlorites
    • C01B11/064—Hypochlorites of alkaline-earth metals

Definitions

  • This invention relates to a method of preserving the dibasic calcium hypochlorite 2Ca(OH) .Ca(OCl 2 described in "my former specifications atent Nos. 934,467 and 5 1,583,421.
  • the dibasic hypochlorite is obtained in the form of flat hexagonal crystals the size of which permits an easy separation of the salt from the mother liquor by centrifuging. In this way a product is obtained containing about 40% of active chlorine and 5'10% of moisture.
  • the dibasic calcium hypochlorite is stable even if containing a water content up to about 15%.
  • manufacture of the dibasic calcium hypochlorite is considerably simplified and acis dustless and odorless and that, in desirable contradistinction to bleaching powder, it does not at all attack the wooden transport casks so that-they can be used repeatedly.
  • I claim 1 The method of handling dibasic calcium hypochlorite which comprises packing the salt into casks in the state in which it is obtained by centrifugating the wet salt.

Description

Patented Jan. 14, 193
HEBMANN S. SCHULTZE, 0F GRIESHEIM-ON-THE-MAIN, GERMANY, ASSIGNOB TO I. G.
FABBENINDUSTRIE AKTIENGESELLSCHAFT, 0F FRANKFORT ON-THE-MAIN, GER- METHOD 01F PRESERVING DIBASIC CALCIUM HYPOCHLORITE No Drawing. Application filed July 25, 1927, Serial No. 208,410, and in Germany August 18, 1926.
This invention relates to a method of preserving the dibasic calcium hypochlorite 2Ca(OH) .Ca(OCl 2 described in "my former specifications atent Nos. 934,467 and 5 1,583,421. According to the method therein described the dibasic hypochlorite is obtained in the form of flat hexagonal crystals the size of which permits an easy separation of the salt from the mother liquor by centrifuging. In this way a product is obtained containing about 40% of active chlorine and 5'10% of moisture.
' It was hitherto considered necessary to free the product from moisture as completely as possible, preferably by heating. The chemists were guided in this respect by former experiences with high grade hypochlorites (see German Patent No. 418494) and bleaching powder (see British Patent No. 242,805)
i 2 in order to desiccate these materials as completely as possible, it has already been proposed to add calcium oxid, or to treat the material with calcium oxid after preliminary dehydration, for instance with hot air.
Now l have found that the dibasic calcium hypochlorite is stable even if containing a water content up to about 15%. By this fact the manufacture of the dibasic calcium hypochlorite is considerably simplified and acis dustless and odorless and that, in desirable contradistinction to bleaching powder, it does not at all attack the wooden transport casks so that-they can be used repeatedly.
I claim 1. The method of handling dibasic calcium hypochlorite which comprises packing the salt into casks in the state in which it is obtained by centrifugating the wet salt.
2. The method of handling dibasic calcium hypochlorite which comprises packing the salt, containing from 5 to about 15% of moisture, into casks.
In testimony whereof I have hereunto set my hand.
HERMANN S. SCHULTZE.
celerated in so far as it is no more necessary to subject the centritugated salt to a special drying process and not even to a washing process. The dibasic calcium hypochlorite is rather practically stable in the state in which it is obtained after the centrifuging process. Even at elevated temperatures the durability is superior to that of common bleaching powder to a surprising extent and practically equals that of the dried dibasic salt, so that the moist product coming from the centrifuge is as tropic-proof as t e perfectly dried salt. Whereas bleaching owder at C. loses about 1%of active 0 orine per day and is therefore nearly com letely decomposed in a little over a month, t e percentage of active chlorine in the moist dibasic by ochlorite as delivered by the centrifu e oni y decreases from 40 to 36-37% under tie same conditions. I
Moist as delivered from the centrifuge
US208410A 1926-08-18 1927-07-25 Method of preserving dibasic calcium hypochlorite Expired - Lifetime US1743242A (en)

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DE276307X 1926-08-18

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2545382A (en) * 1946-10-23 1951-03-13 Rahner Francis Victor Portable photographic light having an adjustable light chamber
US3544267A (en) * 1968-09-04 1970-12-01 Pennwalt Corp Calcium hypochlorite product and process for producing same
US3645005A (en) * 1970-04-14 1972-02-29 Pennwalt Corp Calcium hypochlorite manufacture
US4985143A (en) * 1988-06-06 1991-01-15 The University Of Maryland Method for packing chromatographic beds

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2545382A (en) * 1946-10-23 1951-03-13 Rahner Francis Victor Portable photographic light having an adjustable light chamber
US3544267A (en) * 1968-09-04 1970-12-01 Pennwalt Corp Calcium hypochlorite product and process for producing same
US3645005A (en) * 1970-04-14 1972-02-29 Pennwalt Corp Calcium hypochlorite manufacture
US4985143A (en) * 1988-06-06 1991-01-15 The University Of Maryland Method for packing chromatographic beds

Also Published As

Publication number Publication date
GB276307A (en) 1927-10-27

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