توليد خميركاغذ از چوب ممرز با فرآيند سولفيت قليايي-آنتراكينون

The product of pulp from hornbeam with alkaline sulfite- AQ process

اﯾﻦ ﺗﺤﻘﯿﻖ ﺑﺎ ﻫﺪف ﺑﺮرﺳﯽ اﺻﻼح ﻣﺎﯾﻊ ﭘﺨﺖ ﻓﺮآﯾﻨﺪ ﺧﻤﯿﺮﮐﺎﻏﺬﺳﺎزي ﻧﯿﻤﻪ ﺷﯿﻤﯿﺎﯾﯽ ﺳﻮﻟﻔﯿﺖ ﺧﻨﺜﯽ )NSSC( ﺑﺎ اﻋﻤﺎل ﺗﻐﯿﯿﺮات درﺻﺪ ﻣﻮاد ﺷﯿﻤﯿﺎﯾﯽ، اﻓﺰاﯾﺶ ﻣﯿﺰان ﻗﻠﯿﺎﺋﯿﺖ و ﺗﻐﯿﯿﺮ زﻣﺎن ﭘﺨﺖ ﺑﺮاي ﺗﻮﻟﯿﺪ ﺧﻤﯿﺮﮐﺎﻏﺬ ﺷﺒﻪ ﺷﯿﻤﯿﺎﯾﯽ )ﺳﻮﻟﻔﯿﺖ ﻗﻠﯿﺎﯾﯽ( اﻧﺠﺎم ﺷﺪه اﺳﺖ. در ﺑﯿﻦ ﺧﻤﯿﺮﮐﺎﻏﺬﻫﺎي ﺗﻮﻟﯿﺪي، ﺑﻬﺘﺮﯾﻦ ﺗﺮﮐﯿﺐ ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻗﻠﯿﺎﺋﯿﺖ ﺑﺎﻗﯽﻣﺎﻧﺪه ﻗﺎﺑﻞ ﻗﺒﻮل )11> pH ( و ﻋﺪد ﮐﺎﭘﺎي ﻗﺎﺑﻞ ﻗﺒﻮل )ﺣﺪود 17( و ﮐﻤﺘﺮﯾﻦ ﻣﻘﺪار وازده اﻧﺘﺨﺎب ﺷﺪ. ﺧﻤﯿﺮﮐﺎﻏﺬ ﺳﻮﻟﻔﯿﺖ ﻗﻠﯿﺎﯾﯽ ﺧﺎﻟﺺ و ﻫﻤﭽﻨﯿﻦ اﺧﺘﻼط درﺻﺪﻫﺎي ﻣﺨﺘﻠﻒ ﺧﻤﯿﺮﮐﺎﻏﺬ ﺳﻮﻟﻔﯿﺖ ﻗﻠﯿﺎﯾﯽ ﺑﺎ ﺧﻤﯿﺮﮐﺎﻏﺬ NSSC ﻣﻘﺎﯾﺴﻪ و ارزﯾﺎﺑﯽ ﺷﺪ. ﻧﺘﺎﯾﺞ ﺑﻪ دﺳﺖ آﻣﺪه ﻧﺸﺎن داد ﮐﻪ ﻣﻘﺎوﻣﺖ ﮐﻠﯽ ﺧﻤﯿﺮﮐﺎﻏﺬ اﺻﻼح ﺷﺪه در ﻣﻘﺎﯾﺴﻪ ﺑﺎ ﺧﻤﯿﺮﮐﺎﻏﺬ NSSC اوﻟﯿﻪ اﻓﺰاﯾﺶ ﯾﺎﻓﺘﻪ اﺳﺖ. ﺑﻄﻮري ﮐﻪ ﺷﺎﺧﺺ ﮐﺸﺶ ﺧﻤﯿﺮ ﮐﺎﻏﺬ ﺳﻮﻟﻔﯿﺖ ﻗﻠﯿﺎﯾﯽ و NSSC ﺑﻪ ﺗﺮﺗﯿﺐ ﺣﺪود 66/2 و 32/4 ﻧﯿﻮﺗﻦ ﻣﺘﺮ ﺑﺮ ﮔﺮم اﺳﺖ. ﺑﺎ اﻓﺰودن ﻣﻘﺎدﯾﺮ ﺑﯿﺸﺘﺮ اﯾﻦ ﻧﻮع ﺧﻤﯿﺮﮐﺎﻏﺬ، ﻣﯽﺗﻮان ﺿﻤﻦ ﺗﺎﻣﯿﻦ وﯾﮋﮔﯽﻫﺎي ﻣﻘﺎوﻣﺘﯽ ﮐﺎﻏﺬ، ﻣﻘﺪار ﻣﺼﺮف ﺧﻤﯿﺮﮐﺎﻏﺬ اﻟﯿﺎف ﺑﻠﻨﺪ وارداﺗﯽ را ﮐﺎﻫﺶ داد.

The objective of this study was to investigate the modification of neutral sulfite semi chemical (NSSC) pulping liquor by applying changes in the percentage of chemicals, increasing alkalinity and changing the pulping duration for the production alkali sulfite (AS). Among the pulps, the best combination was acceptable with respect to the residual alkalinity (pH> 11) and the acceptable kappa number (about 17) and the lowest amounts of so-called undercooked wood (or “rejects”) was selected. Pure AS pulp and also the mixing of different percentages of AS pulp with NSSC pulp were compared. The results showed that the overall strength of the modified pulp compared with the initial NSSC pulp increased. So that the alkali sulfite (AS) and NSSC is about 66.2 and 32.4 N.m/ g, respectively. By adding more amounts of this pulp in furnish, by increasing the required strength of the paper, the consumption of pulp from the imported long fiber could be reduced while maintaining the paper's strength properties.