| 摘要 |
<p>PULPING OF HARDWOOD WITH SODIUM SULFIDE AND SODIUM HYDROXIDE WHILE GENERATING HYDROGEN SULFIDE IN SITU IN THE INITIAL PULPING STAGES 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.degree.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.degree.C in the presence of an alkaline pulping liquor comprising sodium hydroxide and a sodium sulfide until cellulose pulp is produced.</p> |
