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NH"4OH-KOH pulping mechanisms and kinetics of rice straw [An article from: Bioresource Technology]
Book Details
Author(s)G. Huang, J.X. Shi, T.A.G. Langrish
PublisherElsevier
ISBN / ASINB000PBZR16
ISBN-13978B000PBZR19
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Bioresource Technology, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The mechanisms and kinetics of NH"4OH-KOH mixture pulping rice straw were studied. When aqueous ammonia was mixed with a small amount of caustic potash (ratio of 1:5), three distinct delignification phases were observed in the pulping process: a bulk delignification phase from the beginning of the cooking period to 100^oC, a supplementary delignification phase from 100^oC to 155^oC lasting a further 45min, and a residual delignification phase until the end of the cooking period. There were two silica removal phases; the first phase was from the beginning of the cooking period to 100^oC and the second phase was from 100^oC to the end of the cooking period. The rate of delignification reaction was first order with respect to residual lignin and 0.3 order with respect to [OH^-]. The silica removal was pseudo-first-order with respect to residual silica and 0.6 order with respect to [OH^-]. The activation energies of the delignification and removal of silica reactions were 35.6 and 30.9kJ/mol, respectively.
Description:
The mechanisms and kinetics of NH"4OH-KOH mixture pulping rice straw were studied. When aqueous ammonia was mixed with a small amount of caustic potash (ratio of 1:5), three distinct delignification phases were observed in the pulping process: a bulk delignification phase from the beginning of the cooking period to 100^oC, a supplementary delignification phase from 100^oC to 155^oC lasting a further 45min, and a residual delignification phase until the end of the cooking period. There were two silica removal phases; the first phase was from the beginning of the cooking period to 100^oC and the second phase was from 100^oC to the end of the cooking period. The rate of delignification reaction was first order with respect to residual lignin and 0.3 order with respect to [OH^-]. The silica removal was pseudo-first-order with respect to residual silica and 0.6 order with respect to [OH^-]. The activation energies of the delignification and removal of silica reactions were 35.6 and 30.9kJ/mol, respectively.
