ES251902A1 - A procedure for the production of sulfit pulp neutral semiquºmica (Machine-translation by Google Translate, not legally binding)
- Google Patents
A procedure for the production of sulfit pulp neutral semiquºmica (Machine-translation by Google Translate, not legally binding)
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Stora Enso Oyj
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Stora Kopparbergs Bergslags AB
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Publication of ES251902A1publicationCriticalpatent/ES251902A1/en
Semi-chemical neutral sulfite pulp production process, essentially characterized in that a suitable percentage of wood chip is vaporized and put in contact with an impregnation bath for a period of convenient duration determined between a minimum of 30 minutes and a maximum of 120 and after the vaporization is carried out by means of a solution of sodium sulfite and bisulfite, of a ph of about 9.5 to 6 which is free of combined or free carbonic acid, the excess of the impregnation solution is removed, without any free bath, carrying out the digestion of the pulp at a temperature of 165 to 175º c. And subsequent defibration of said pulp. (Machine-translation by Google Translate, not legally binding)
ES0251902A1959-09-111959-09-04A procedure for the production of sulfit pulp neutral semiquºmica (Machine-translation by Google Translate, not legally binding)
ExpiredES251902A1
(en)
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