Home

Primary Examiner: Thomas, Earl C.
Assistant Examiner:
Attorney: Stringham; Robert R.

Next ten patents ordered by date:

Process of preparing dicyan
Production of sulfuryl fluoride
Process for producing sulfur from sulfur dioxide or ammonium sulfites
Waste stream treatment
Direct agglutination test for pregnancy
Pharmaceutical preparation
Anti-inflammatory polymers, pharmaceutical compositions containing the same and process for producing said polymers
Ophthalmic formulation
Hydrolytic process for the preparation of amino acids
Piglet enteritis treatment

Translate:
En
De
Es
Fr
It
Pt
Ja
Ko
Zh

Title: Safe method for thermal decomposition of nitrogen trichloride

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Claims: We claim:

1. The process for decomposing nitrogen trichloride to nitrogen and chlorine which comprises heating a solution of not more than about 3.5 weight percent NCl.sub.3 in an inert solvent, under at least autogenous pressure, to a temperature within the range of from about 105.degree. C. to that resulting in an autogenous pressure of 300 psig.

2. The process of claim 1 in which the solvent is water-immiscible.

3. The process of claim 2 in which the solvent is carbon tetrachloride, methylene chloride, ethylene dichloride, benzene or mixtures thereof.

4. The process of claim 1 in which the solvent contains hydrogens potentially replaceable with chlorine and the NCl.sub.3 concentration is not in excess of about 2 weight percent.

5. The process of claim 1, wherein the NCl.sub.3 concentration is about 2 weight percent or less and the decomposition is carried out as a batch reaction.

6. The process of claim 1 wherein the NCl.sub.3 concentration is greater than about 2 weight percent and the decomposition is carried out in a continuous flow mode.

7. The process of claim 1 wherein the temperature is within the range of from about 120.degree.-130.degree. C.

8. The process of claim 1 wherein said solution additionally contains chlorine and the mole fraction of chlorine therein is 0.05 or less.

9. The process of claim 1 wherein said solution is a mother liquor or condensate derived from a solution of trichloroisocyanuric acid produced by the reaction of chlorine in excess with an aqueous trialkalimetal cyanurate solution in the presence of said solvent.

10. The process of claim 9 wherein the solution of chlorine in said solvent formed upon said heating is recycled to said reaction of chlorine with an aqueous trialkalimetal cyanurate solution.

11. The process of claim 8 wherein the solvent is ethylene dichloride, the temperature is within the range of 124.degree.-126.degree. and the heating is continued until at least half the NCl.sub.3 originally present has been decomposed.

12. The process of claim 1 wherein said solution is formed by flowing said solvent through any portion of a reaction system for the production of trichloroisocyanuric acid by the chlorination of a trialkalimetal salt in aqueous solution or suspension.

13. The process of claim 1 wherein said solution is formed by a procedure comprising intimately contacting said solvent with an aqueous mother liquor from which trichloroisocyanuric acid has been separated.
Other info:

Inventors: Hill, Howard W. (Sea Ranch, CA, US)
Hassall, Ronald E. (Antioch, CA, US)

Application Number: 573224
Filing Date: 1975-04-30
Publication_date: 1977-01-18
Assignee: The Dow Chemical Company (Midland, MI)
Primary Class(es): 423/351 423/235, 423/406, 423/500, 544/190
Other Classes:
US Patent Ref:

2692818

Oct, 1954

Bewick

423/500.

Other Refs: Other References: Mellor, "A Comprehensive Treatise on Inorganic & Theoretical Chemistry," Longmans, Green & Co., New York, vol. 8, p. 601, 1928.