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The Main Component Transformation Rule in Black Liquor from Eucalyptus and Bamboo Mixed by Displacement Cooking

Author: ZhangWenChao
Tutor: XuKaiShao
School: Guangxi University
Course: Pulp and Paper Engineering
Keywords: DDS Alkali-soluble lignin Reducing sugar Silica Methanol Variation
CLC: TS745
Type: Master's thesis
Year: 2008
Downloads: 104
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Abstract


Eucalyptus and bamboo mixed cooking , at the same time to solve the contradiction between supply and demand of raw materials , can improve the pulp quality . DDS cooking is clean , environmentally friendly cooking process for eucalyptus and bamboo mixed digester gradually adopted by the factory . BLACK LIQUOR chemical components and their contents have an important influence on the process conditions to develop and Recovery research significance . This thesis, steaming eucalyptus bamboo mixed DDS , changing the proportion of eucalyptus and bamboo cooking process , to extract each stage of black liquor , and the Institute of components and their contents extracted black liquor , which reflects the variation of the cooking process cooking and raw material components . Alkali-soluble lignin in the black liquor by UV spectrophotometer and standard curve analysis . The experimental results show that , when the proportion of bamboo dosage increases or TBN same amount , the degree of vulcanization increases can cause the alkali-soluble lignin content of the black liquor increases ; vice versa so that the content of the black liquor in the alkali-soluble lignin is reduced . In this paper, the 3,5 - dinitrosalicylic acid method using glucose as standard detection of black liquor in reducing sugar content to determine the degradation of carbohydrates . The experimental results show that the digester initial high vulcanization degree of the dissolution of the reducing sugars does not have a significant effect, but with the increase of the amount of alkali can make the increase in reducing sugar elution amount ; digester final degree of vulcanization and the use of the increase in the amount of alkali can be accelerated carbohydrate degradation the increase in the amount of reducing sugars dissolution alone increase the cooking temperature for reducing sugar dissolution effect is not obvious . UV spectrophotometer silicon molybdenum blue method as the basis of change in the silica content of the dual - wavelength silicon molybdenum yellow method detects black liquor , and so the formula derived results . Derived by this method a silica content of black liquor depends primarily on the proportion of cooking a raw material , When the bamboo proportion of the amount is increased , and a silica content of the black liquor ; total alkali unchanged , the degree of vulcanization increases , reduce the silica content of the black liquor . In this paper, the main gas cooking produced organic compounds methanol using HS-GC method for testing . The increase in the ratio of mixed cooking eucalyptus hemicellulose structure lead to increased production of methanol ; methanol content can be increased with the increase of alkali content ; increase sulfide reduced methanol content .

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CLC: > Industrial Technology > Light industry,handicrafts > Paper Industry > Pulping process > Bleach
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