EP0153841A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Production of chlorine dioxide
Assignee: Tenneco Canada Inc
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Filing: 1985-02-19
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Granted: —
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Expires: 2005-02-19
Abstract
Abstract @ Chlorine dioxide, particularly for water treatment but useful in other applications of chlorine dioxide, such as the bleaching of pulp, is produced in an enclosed reaction zone filled with chlorine dioxide-generating reaction medium under sufficient pressure to prevent chlorine dioxide from forming a continuous gaseous phase and the resulting aqueous solution of chlorine dioxide in spent reaction medium is discharged to a recipient aqueous medium, such as a flowing water body to be treated, without the formation of gaseous phase chlorine dioxide.
Inventors
- 👤 William Howard Rapson
- 👤 Maurice Conrad Joseph Fredette
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 23:44
CPC Classifications
C; C01; C01B; C01B11/00; C01B11/02; C01B11/022; C01B11/023; C01B11/026; C02; C02F; C02F1/00; C02F1/72; C02F1/76
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
98 words
1 . A process for the production of an aqueous solution of chorine dioxide, characterized in that chlorine dioxide-producing reactants are fed to a reaction zone which is filled with an aqueous reaction medium; the aqueous reaction medium is subjected to a superatmospheric pressure in the reaction zone which is sufficient to maintain potentially gaseous products of the reaction including chlorine dioxide in solution and the resulting aqueous solution of chlorine dioxide in the spent reaction medium is discharged from the reaction zone to an aqueous medium under such conditions that substantially no chlorine dioxide gas is formed.
Claim 2
Dependent Claim
98 words
1 . A process for the production of an aqueous solution of chorine dioxide, characterized in that chlorine dioxide-producing reactants are fed to a reaction zone which is filled with an aqueous reaction medium; the aqueous reaction medium is subjected to a superatmospheric pressure in the reaction zone which is sufficient to maintain potentially gaseous products of the reaction including chlorine dioxide in solution and the resulting aqueous solution of chlorine dioxide in the spent reaction medium is discharged from the reaction zone to an aqueous medium under such conditions that substantially no chlorine dioxide gas is formed.
Claim 3
Dependent Claim
31 words
A process according to claim 1, characterized in that the solution of chlorine dioxide from the reaction zone is discharged directly to an aqueous medium in order to disinfect that medium.
Claim 4
Dependent Claim
72 words
The process claimed in either of claims 1 or 2, characterized in that the reaction zone is an elongate tubular reaction zone, the chlorine dioxide-producing reactants are fed as two separate reactant streams to one end of the tubular reaction zone to be intermixed thereat, the intermixed reactants flow through the tubular reaction zone, and the aqueous solution of chlorine dioxide is discharged from the other end of the tubular reaction zone.
Claim 5
Dependent Claim
34 words
The process claimed in claim 3, characterized in that at least one of the reactant streams is fed generally tangentially to a circular mixing zone at the one end of the tubular reaction zone.
Claim 6
Dependent Claim
42 words
The process claimed in claim 3, characterized in that one of the reactant streams is fed to the converging portion of a venturi zone and the other of the reactant streams is fed to to the collar portion of the venturi zone.
Claim 7
Dependent Claim
57 words
The process claimed in claim 3, 4, or 5, characterized in that one of the reactants comprises an aqueous solution of sodium chlorate, the other of the reactants comprises a strong acid, and a reducing agent for the sodium chlorate is provided by the acid or as a separate component in the aqueous solution of sodium chlorate.
Claim 8
Independent Claim
66 words
An apparatus for the production of an aqueous solution of chlorine dioxide, characterized by an elongate reaction tube (12) having an inlet for reactants at one longitudinal extremity and an outlet (38) for the discharge of reaction products from the other longitudinal extremity, a mixing chamber (50) communicating with the inlet, and chlorine dioxide generating reactant feed inlets (54, 56) communicating with the mixing chamber (50).
Claim 9
Independent Claim
66 words
An apparatus for the production of an aqueous solution of chlorine dioxide, characterized by an elongate reaction tube (12) having an inlet for reactants at one longitudinal extremity and an outlet (38) for the discharge of reaction products from the other longitudinal extremity, a mixing chamber (50) communicating with the inlet, and chlorine dioxide generating reactant feed inlets (54, 56) communicating with the mixing chamber (50).
Claim 10
Dependent Claim
48 words
The apparatus claimed in claim 7, characterized in that the mixing chamber (50) is of generally circular cross-section and one of the feed inlets (.54) communicates generally tangentially to the mixing chamber (50) while the other of the feed inlets (56) extends axially into the mixing chamber (50).
Claim 11
Dependent Claim
66 words
The apparatus claimed in claim 8, characterized in that the mixing chamber (50) is defined by an end plate (44) and a central opening in an annular flange (36) to which the reaction tube (12) is attached, the one feed inlet (54) extends in a generally radial direction through the annular flange (36), and the other feed inlet (56) extends axially through the end plate (44).
Claim 12
Dependent Claim
43 words
The apparatus claimed in claim 9, characterized in that a second bore (72) extends generally radially through the annular flange (36) to permit flushing water to be fed to the mixing chamber (50) and through the reaction tube (12) to the outlet (42).
Claim 13
Independent Claim
49 words
The apparatus claimed in any one of claims 7 to 10 characterized in that the outlet (38) comprises a conical portion (40) of diameter decreasing in the direction of reaction medium flow and terminating in an axial bore (42) through which reaction products are discharged from the reaction tube.
References Cited (Backward Citations)
No citation records indexed.
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