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US3789108A Expired / Lapsed US ⏱️ 0.0 years remaining

Production of chlorine dioxide

Assignee: Erco Industries Ltd
•
Filing: 1973-02-08
•
Granted: 1974-01-29
•
Expires: 1993-02-08
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Abstract

Abstract Chlorine dioxide is produced from three reactors, the first reacting sodium chlorate, sodium chloride and/or hydrogen chloride, and sulphuric acid at an acidity in excess of 4.8N to deposit sodium acid sulphate, the second reacting sodium chlorate, sodium chloride and/or hydrogen chloride, and a sulphate-ion material which is constituted at least in part by the sodium acid sulphate deposited in the first reaction, at an acidity greater than 4.8N to deposit sodium sesquisulphate. In the third vessel sodium chlorate, sodium chloride and/or hydrogen chloride and a sulphate-ion material which is constituted at least in part by the sodium sesquisulphate at an acidity less than 4.8N to deposit sodium sulphate.

Inventors

  • 👤 W Rapson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 09:08
CPC Classifications
C; C01; C01B; C01B11/00; C01B11/02; C01B11/022; C01B11/023; C01B11/025

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 32 words
The process of claim 1 wherein said first, second and third reaction media are maintained at a boiling temperature and said first, second and third reaction zones are maintained under reduced pressure.
Claim 2
Dependent Claim 47 words
The process of claim 2 wherein the sodium bisulphate precipitated in said first reaction zone constitutes the sole source of acidity of said second reaction medium and the sodium sesquisulphate precipitated in said second reaction zone constitutes the sole source of acidity of said third reaction medium.
Claim 3
Dependent Claim 29 words
The process of claim 1 wherein the acidity of said first reaction medium is appoximately 10N and the acidity of said second reaction medium is approximately 7 to 8N.

References Cited (Backward Citations)

CA543589A Cited
US3341288A Cited
GB1056790A Cited
GB1077306A Cited
US3347628A Cited
US3563702A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-01-28 1977-07-30 1978-01-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-01-28 1981-07-30 1982-01-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-01-28 1985-07-30 1986-01-29 $7700.00 Window Closed / Lapsed

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