Abstract

The delignification and bleaching of chemical pulp by a bleaching stage, in which the chemical pulp is reacted first with chlorine dioxide and, after reaction of the chlorine dioxide, is further reacted without intermediate washing with hydrogen peroxide in the presence of a molybdate or tungstate, permits the production of chemical pulp having a whiteness …

Legal parties

Party
Inventors (applicants): Thomas Dietz
Assignees (initial): Evonik Degussa GmbH (Essen, DE)
Agents: Law Office of: Michael A. Sanzo, LLC (attorney)

The application was examined by Anthony Calandra (USPTO dept. 1741)

Claims

  • 1. A process for delignifying and bleaching chemical pulp, comprising a bleaching stage, wherein: …
  • 2. The process of claim 1 , wherein the first and second steps are carried …
  • 3. The process of claim 1 , wherein the first and second steps are carried …

International priority data

DE: 10 2010 001 001 / Jan. 19, 2010 (national)

Cited documents

Patents

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Description

Field of the Invention

The invention relates to a process for delignifying and bleaching chemical pulp with chlorine dioxide and hydrogen peroxide in the presence of a molybdate or tungstate …

Cross Reference to Related Applications

The present application claims the benefit of U.S. provisional application 61/297,754 filed on Jan. 23, 2010 and priority to German Application DE 10 2010 001 001.4 filed on Jan. 19 …

Description of the Invention

It has now surprisingly been found that, with a bleaching stage D/P cat , in which the chemical pulp is reacted first with chlorine dioxide and, after consumption of the chlorine …

More details about Process for Delignifying and Bleaching Chemical Pulp

Miscellaneous patent data

The invention is named Process for Delignifying and Bleaching Chemical Pulp, the agent's company - Law Office of: Michael A. Sanzo, LLC, the assignee classification - a foreign company or corporation, 16 claims comprise the protection scope, the patent particularly claims a process for delignifying and bleaching chemical pulp, comprising a bleaching…, the primary classification Per-compound has been designated to the document, the claim number 1 is selected as exemplary, the known applicant's name is Dietz Thomas, similar categories include heating, Devices for regulating or controlling, oxygen or its allotropic modifications, Pressure forming, ClO2 or chlorites, Apparatus, Amine- or amide-aldehyde, Oxygen, ozone or air, Deodorisation, Feeding devices, the assignee organization is Evonik Degussa GmbH, located in Essen (DE), the grant number is 08568558, the application publication date is Jan. 16, 2011, the grant date is Oct. 29, 2013 (publication date), the patent grant extension term is 298 days, numbered 13/007,664 (application), the inventor's last name is Dietz, and his first name is Thomas, developed by Thomas Dietz, an application examiner - Anthony Calandra (1741 USPTO department).

Invention classification information

The invention is classified under Plural diverse stage treatments, Chlorine containing, with ClO2 or chlorites, with per compounds, Heavy metal or aluminum containing, Per-compound. The designated search classifications include Per-compound, Chlorine containing, Chlorine containing, Heavy metal or aluminum containing.

Patent details
Publication number 08568558
Publication date Oct. 29, 2013
Kind code B2
Application number 13/007,664
Application date Jan. 16, 2011
Application type U
Application series code 13
Extension term 298
National classification 162/78
Total number of claims 16
Exemplary claims 1
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