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.)
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Atlantic Richfield Co
Original Assignee
Atlantic Richfield Co
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Filing date
Publication date
Application filed by Atlantic Richfield CofiledCriticalAtlantic Richfield Co
Publication of ES392850A1publicationCriticalpatent/ES392850A1/en
D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
D21C3/00—Pulping cellulose-containing materials
D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
D—TEXTILES; PAPER
D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
D21C9/10—Bleaching ; Apparatus therefor
D21C9/16—Bleaching ; Apparatus therefor with per compounds
D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
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Chemical & Material Sciences
(AREA)
Inorganic Chemistry
(AREA)
Life Sciences & Earth Sciences
(AREA)
Engineering & Computer Science
(AREA)
Wood Science & Technology
(AREA)
Paper
(AREA)
Abstract
A method for pulping and whitening wood chips by treating them with sodium hydroxide, characterized in that said chips are contacted in a single step with a mixture of tert-butyl hydroperoxide and sodium hydroxide in an aqueous solution., at a temperature between 0ºC and 150ºC and at pressures comprised between the atmospheric pressure and the autogenous pressure of the reaction at the temperature used. (Machine-translation by Google Translate, not legally binding)
ES392850A1970-07-241971-07-02A method to reduce pulp and blank the wooden chips. (Machine-translation by Google Translate, not legally binding)
ExpiredES392850A1
(en)
Procedure for the manufacture of a panel in plastic laminate with decorative surface in relief (Machine-translation by Google Translate, not legally binding)
Procedure for the production of bºrico hydroxide from an aqueous solution of bernic sulfide (Machine-translation by Google Translate, not legally binding)
A method to reduce the trend of a di chest composition to decomponse under the influence of moisture and air. (Machine-translation by Google Translate, not legally binding)