Developments in pulp and paper manufacture from sugarcane ...
Developments in pulp and paper manufacture from sugarcane ... Developments in pulp and paper manufacture from sugarcane ...
Cooking & Brownstock Washing Pulp Grade Semi-chemical Semi chemical Full chemical Process soda soda Kraft Cooking Conditions Chemical Charge (on OD fibre) 6 – 10% NaOH 12 – 16% NaOH 11 – 13% AA as Na 2O 15 – 20% sulphidity Time 8 – 10 min 10 – 12 min 10 – 12 min Temperature 175 0C 170 – 175 0C 170 – 175 0C This table shows typical cooking conditions for producing semi-chemical grade and full chemical bleachable grade bagasse pulps. It is possible to operate at lower temperatures but then the amount of time in the digester must increase. 22
Cooking & Brownstock Washing Brownstock Washers Coru-Dek IV Vacuum Filter Compaction Baffle Filter Brownstock washers wash the cooked pulp to remove the used cooking liquor and dissolved material. The washer filtrate called black liquor contains dissolved lignin, hemicellulose, and inorganic material from the cooking liquor as well as those dissolved from the bagasse. Brownstock washers are offered by many suppliers. They also come in various types of vacuum and pressure washers. In the woodpulp industry, high capacity twin roll press washer are used extensively but they have not been used in nonwood mills as yet. This slide shows two types of filters offered by GL&V of Canada – a Coru-Dek IV vacuum filter and a Compaction baffle pressure filter. 23
- Page 1 and 2: Developments in pulp and paper manu
- Page 3 and 4: Bagasse Pulp Mill Units Moist depi
- Page 5 and 6: Moist Depithing 5
- Page 7 and 8: Type Pro Zell Depither Driving powe
- Page 9 and 10: Bagasse Pulp Mill Units Moist depi
- Page 11 and 12: Wet Bulk Storage Bagasse wet bulk
- Page 13 and 14: Wet Bulk Storage Artist rendition -
- Page 15 and 16: Wet Bulk Storage Boom Stacker - Tam
- Page 17 and 18: Wet Depithing/Cleaning Wet depither
- Page 19 and 20: Bagasse Pulp Mill Units Moist depi
- Page 21: Cooking & Brownstock Washing Contin
- Page 25 and 26: Oxygen Delignification Oxygen delig
- Page 27 and 28: Bagasse Pulp Mill Units Moist depi
- Page 29 and 30: Screening & Cleaning Screens GL&V H
- Page 31 and 32: Bagasse Pulp Mill Units Moist depi
- Page 33 and 34: Bleaching This flowsheet shows an E
- Page 35 and 36: Bagasse Paper Mill Units Purchased
- Page 37 and 38: Purchased Pulp & Stock Preparation
- Page 39 and 40: PM Approach Flow System & Wet End T
- Page 41 and 42: PM Approach Flow System & Wet End V
- Page 43 and 44: Paper Machine Dry End The paper she
- Page 45 and 46: Paper Machine Dry End Press Section
- Page 47 and 48: Paper Machine Dry End Size Press Me
- Page 49: Paper Machine Dry End Reel Metso Va
Cook<strong>in</strong>g & Brownstock Wash<strong>in</strong>g<br />
Pulp Grade<br />
Semi-chemical<br />
Semi chemical<br />
Full chemical<br />
Process<br />
soda<br />
soda<br />
Kraft<br />
Cook<strong>in</strong>g Conditions<br />
Chemical Charge<br />
(on OD fibre)<br />
6 – 10% NaOH<br />
12 – 16% NaOH<br />
11 – 13% AA as Na 2O 15 – 20% sulphidity<br />
Time<br />
8 – 10 m<strong>in</strong><br />
10 – 12 m<strong>in</strong><br />
10 – 12 m<strong>in</strong><br />
Temperature<br />
175 0C 170 – 175 0C 170 – 175 0C This table shows typical cook<strong>in</strong>g conditions for produc<strong>in</strong>g semi-chemical<br />
grade <strong>and</strong> full chemical bleachable grade bagasse <strong>pulp</strong>s. It is possible<br />
to operate at lower temperatures but then the amount of time <strong>in</strong> the<br />
digester must <strong>in</strong>crease.<br />
22
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