Pulping of hardwood with sodium sulfide and sodium hydroxide...

Details Pulping of hardwood with sodium sulfide and sodium hydroxide... Pulping of hardwood with sodium sulfide and sodium hydroxide...

D - Textiles, Paper

21

C

9/17

D21C 3/02 (2006.01) D21C 3/26 (2006.01)

Patent

CA 1080914

PULPING OF HARDWOOD WITH SODIUM SULFIDE AND SODIUM HYDROXIDE WHILE GENERATING HYDROGEN SULFIDE IN SITU IN THE INITIAL PULPING STAGES ABSTRACT OF THE DISCLOSURE A process is provided for pulping hardwood,producing cellulose pulp in good yield and of high quality, with a low requirement for causticized pulping liquor, which comprises in a first pulping stage pulping the hardwood in an alkaline pulping liquor containing sodium sulfide at a temperature within the range from about 110 to about 170°C while generating hydrogen sulfide in situ by reaction of sodium sulfide with organic acids liberated in the pulping; and then in a second pulping stage following directly after the first pulping stage, continuing the pulping at a higher temperature within the range from about 145 to about 190°C in the presence of an alkaline pulping liquor comprising sodium hydroxide and a sodium sulfide until cellulose pulp is produced.

271114

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