CA2017334A1 - Ozone treatment of chlorine dioxide/chlorine chlorinated pulp - Google Patents

Ozone treatment of chlorine dioxide/chlorine chlorinated pulp

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Publication number
CA2017334A1
CA2017334A1 CA 2017334 CA2017334A CA2017334A1 CA 2017334 A1 CA2017334 A1 CA 2017334A1 CA 2017334 CA2017334 CA 2017334 CA 2017334 A CA2017334 A CA 2017334A CA 2017334 A1 CA2017334 A1 CA 2017334A1
Authority
CA
Canada
Prior art keywords
pulp
chlorine
present
ozone treatment
chlorinated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2017334
Other languages
French (fr)
Other versions
CA2017334C (en
Inventor
Ted Y Tsai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Paper Co
Original Assignee
International Paper Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Paper Co filed Critical International Paper Co
Priority to CA 2017334 priority Critical patent/CA2017334C/en
Publication of CA2017334A1 publication Critical patent/CA2017334A1/en
Application granted granted Critical
Publication of CA2017334C publication Critical patent/CA2017334C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The present invention provides for improvements in the preparation of cellulosic wood pulp for use in papermaking, and specifically to enhancement of the quality of a pulp which has been subjected to a chlorine-based bleaching agent, by subjecting the chlorinated pulp to ozonation prior to an extraction stage in the bleaching sequence. The improved pulp of the present invention includes reduction of total organically bound chlorine residues in the wood pulp and adsorbed organic halides (AOX) in the effluent, and has good brightness and viscosity. The advantages of the present invention may be accomplished by means of a bleaching sequence that employs as few as four stages, namely DZED
with attendant relatively lower capital investment than heretofore possible.
CA 2017334 1990-05-23 1990-05-23 Ozone treatment of chlorine dioxide/chlorine chlorinated pulp Expired - Fee Related CA2017334C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2017334 CA2017334C (en) 1990-05-23 1990-05-23 Ozone treatment of chlorine dioxide/chlorine chlorinated pulp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2017334 CA2017334C (en) 1990-05-23 1990-05-23 Ozone treatment of chlorine dioxide/chlorine chlorinated pulp

Publications (2)

Publication Number Publication Date
CA2017334A1 true CA2017334A1 (en) 1991-11-23
CA2017334C CA2017334C (en) 2000-07-25

Family

ID=4145043

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2017334 Expired - Fee Related CA2017334C (en) 1990-05-23 1990-05-23 Ozone treatment of chlorine dioxide/chlorine chlorinated pulp

Country Status (1)

Country Link
CA (1) CA2017334C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6174409B1 (en) 1997-09-19 2001-01-16 American Air Liquide Inc. Method to improve final bleached pulp strength properties by adjusting the CI02:03 ration within a single (D/Z) stage of the bleaching process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6174409B1 (en) 1997-09-19 2001-01-16 American Air Liquide Inc. Method to improve final bleached pulp strength properties by adjusting the CI02:03 ration within a single (D/Z) stage of the bleaching process

Also Published As

Publication number Publication date
CA2017334C (en) 2000-07-25

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