87 



obtained during the process, the following table of results was 

 accordingly prepared : — 



Reactions. 



I 



2 



3 



1 



4i 5 



6 



7 



8 



9 



10 



II 



12 



13 



14 



Caustic Soda (per 

 rent NaOHi 



10 



10 



J J 



12 i; 



16 





T c 



T Z 











14 



Sulphite Liquor 

 Soda, Salt 

 equivalent 

 (Na SO per 



ce"t) 









1 

 1 

 1 

 1 











16 









.. 



Sodium Sulphite 

 and Caustic 

 Soda (total 









1 

 1 



I 



..j .. 













12 



16 







Pressure in " at- 

 mospheres " . . 





2^^ 5 



3 



1 

 1 



3 5 



2 



2-12 





7 



2V2 





2V2 



2 



2V2 



Time in 

 " hours " 



8 



12 



10 



12 61/^ 



7 



6 



7 



9 





7 



7V2 



12 



8 



OBSERVATIONS, 



No. I . Under-boiled. 



„ 2. Over-boiled. 



}' 3" " " 



„ 4. Unsatisfactory yield of pulp. 



„ 5. Fair conditions. 



6. „ Readily bleached. 



7. Good conditions and yield. 

 „ 8. Best general results. 



9. Good pulp. Considerable loss in yield. 



10. Fair condition. Imperfectly resolved. 



11. Improved strength of fibre. 

 12. 



„ 13. Fair pulp, not readily bleached. 



14. Good results. 



The conversion of the grass into pulp in the digester in the case 

 of boils exceeding 9 hours, duration was usually accompanied by a 

 considerable loss in the ultimate yield, and many difficulties presented 

 themselves in the course of the first experiments. 



From the above series of trials upon a practical scale the pro- 

 portions of caustic soda and general conditions as employed during 

 the boil " No. 14 " were considered the most desirable for the purpose 

 of producing good average fibre, at a reasonable expenditure o 

 chemicals. 



