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Minimizing sulfur oxidation in pulping liquor reconstitution

阅读:493发布:2021-01-15

专利汇可以提供Minimizing sulfur oxidation in pulping liquor reconstitution专利检索,专利查询,专利分析的服务。并且Disclosed is an improved process for the liquid phase coking of spent wood pulping liquors wherein a part of the decoked effluent is flash vaporized to supply condensate for SO2 absorption, thus eliminating the need to absorb SO2 from an oxygen-containing flue gas into sulfite ion-containing coker effluent, thereby minimizing sulfite ion oxidation and reducing the amount of makeup chemicals required to reconstitute the pulping liquor. The process is applicable to all acid sulfite pulping processes employing metallic ions such as sodium, calcium, magnesium, to ammonia-base sulfite and alkaline sulfite pulping liquors.,下面是Minimizing sulfur oxidation in pulping liquor reconstitution专利的具体信息内容。

  • 2. The process of claim 1, wherein said flash vaporizing is effected by flowing said decoked effluent to a flashing zone and reducing pressure thereon to about 100 psig.
  • 3. The process of claim 1, wherein the pH of said liquors is reduced to between about 7 and 3 before coking.
  • 4. The process of claim 1, wherein said liquors are coked by heating at a rate of 110* to 150*F per minute in the temperature range of about 350*F to about 550*F.
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