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Parameter Proses Produksi Viscose

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  Production Parameters Speed spinning 60 m/min LINE B #Viscose Department 1.   Alkalizing a.   Input : 1)   Pulp : 1 batch = 3 pulp (ratio 2 hardwood : 1 softwood ), @ pulp = 200 till 208 kg 2)   Caustic (NaOH) : concentration 18% (217-223 g/L), @ amount consume = 13300 kg/batch. 3)   Catalyst : total volume per batch = 10 Liter. MnSO4 = 0,05 % (level tank) per batch = 0,5 % x 1 m 3  = 16,25 kg. V388 = 0,05 % (level tank) per batch = 0,5% x 1 m 3  = 5 L b.   Operation Condition : - speed rotary = 1000 rpm - Temperature = 49-52 0 C - Power = 160 Kw - Time = 6-7 minute per batch. Time Process step : 1.   Inlet lye : 45 second 2.   Inlet pulp + catalyst : 100 second 3.   Blend : 275 second Total : 420 second c.   Volume (m 3 ) : Capacity Pulper : 23 m 3 , actual : 55 % level tank = 12,65 m 3 Volume per batch : 12,45 m 3  Volume per hours : 12,45 m 3  x 9 times per hours = 112,05 m 3 /h Note:   NaOH = 1,12 g/cm 3  = 1120 kg/m 3    NaOH = 13500 kg.  NaOH = 135001120  = 12,05 m 3 .   Pulp (cellulose) = 1,5 g/cm 3  = 1500 kg/m 3     cellulose = 600 kg.  cellulose = 6001500  = 0,4 m 3 .  d.   Discharge (output) - Volume : 112,05 m 3 /h , transfer by slurry pump 112,05 : 5 unit = 22,41 m 3 /h. - Actual, slurry pump = average 60% set point speed x 40 m 3 /h (capacity slurry pump) = 24 m 3 /h 2.   Steeping Lye -   Capacity : 94 m 3 , actuall volume tank 48%-50%. -   Working temperature tank : 52-54 o C. -   Steeping lye concentration = 217-223 g/L Inlet : -   Flow stong lye = 4,6 - 5 m 3 /h = 37  –  40 m 3 / shift = 110-120 m 3 /day -   Flow soft water = 8,5 - 9 m 3 /h -   Ratio soft water : lye = -   Mix. softwater + lye (density) = 1225 kg/m 3  Outlet : -   Flow to head tank alkalizing : 12,05 m 3  x 9 (time/hours) = 108,45 m 3 /h -   Consume strong lye : 0,51 m 3 /batch -   Flow to soda lye station : 6,50 m 3 /h. -   Spray for press lye : 60 m 3 /h Return : -   press machine : Drum filter : Pump a.   Pump for steeping lye have 2 unit, 1 use and 1 standby. - pump capacity : 220 m 3 /h , pressure = 0,40  –  0,45 MPa. b.   Cycle pump for steeping lye : have 1 unit with capacity 220 m 3 /h c.   Pump for press lye to drum filter : have 1 unit with capacity 100 m 3 /h, pressure = 0,45-0,50 MPa. - Filter for Press lye (Drum filter) : capacity = 120-160 m 3 /h. d.   Spray pump for press lye : have 1 unit with capacity 60 m 3 /h, pressure = 0,40-0,45 Mpa. 3.   AC Press and Shredder  - speed slurry pump : capacity 40 m 3 /h , actual speed 60% x 40 m 3 /h = 24 m 3 /h - speed motor roller pressing : 33-38 r/min (just no 5 that 33 rpm) - result pressing : 32-34% celulose, 15-16% alkali. 4.   Ageing Drum and AC Cooler Ageing drum  1.   Volume : capacity = 272 m 3 or 21  –  22 batch pulp (full capacity) 2.   Temperature : have 5 point for check temp. ( 52, 54, 52, 58, 55 o C). inlet temperature from pressing machine = 43-45 o C. 3.   Speed = capacity max : 0,9 rpm, actual 60 % = 0,54 rpm. 4.   Time = 1.5 -3.0 hours. Result ageing outlet : -   outlet temperature = 40-45 o C -   % cellulose = 33,5 % -   % alkali : 15,5% AC cooler -   Inlet temperature = 45 o C  –  50 o C -   Outlet temperature = 35 o C  –  37 o C. -   Conveyor to hopper = length 43 m 5.   Xanthator a.   Input : Alkali Cellulose = 9500 kg = 3182,5 kg (33,5 % cellulose) CS 2 = 835-850 L = 33,1-33,7 % (rasio CS 2 vs cellulose) Dissolving lye = 22-23 m 3  with concentration 12-15 g/L. b.   Operation Condition : Initial temperature of xanthator = 23-27 o C Final temperature of xanthator = 32-34 o C Xanthator rotation = 6 rpm (low speed) and 12 rpm (high speed) Ampere of xanthator agitator : Step process : 1. The process of feeding AC or cellulose alkaline input from the hopper to the xanthator occurs for 8-10 minutes with 9500 kg of alkaline cellulose (3182 kg cellulose) and the xanthator motor speed of 6 rpm. Xanthator temperature was recorded at 19-23 o C. 2. The vacuum check process occurs for 5-6 minutes until the pressure reaches -0.87 bar. Then the addition of N 2  for 1 minute and change the vacuum pressure to -0.73 bar. 3. The process of adding CS 2  occurs for 10-12 minutes of 850 L with the amount transferred is 60-79 L / min. 1. in the first 5 minutes the temperature rises to 25 o C 2. in the second 5 minutes the temperature rises to 26-27 o C and the color appearance begins to turn yellowish. 4. The xanthating process occurs for 36-40 minutes and the temperature rises to 32-34 o C, cellulose conditions begin to dissolve and mix with CS 2  with the appearance of a more yellow color with a thickness that is still quite high. 5. The process of adding dissolving lye occurs for 40-45 seconds. The dissolving lye temperature used is around 6-9 degrees with volume about . Addition of disslye in addition to increasing solubility is also to reduce xhantahing temperature. 6. High speed stirer or the process of adding xanthator rotation speed occurs for 9-13 minutes with a  speed of 12 rpm which aims to homogenize the addition of disslye and also to increase the solubility of xanthat. In this stage Xhantator temperature at this stage will drop to 19 o C. 7. Discharge 1 : when discharge step, valve blower open to waste recovery and valve nitrogen open c.   Volume (m 3 ) : Capacity : 3 Ton Cellulose / batch = m 3 d.   Discharge (output) : Volume : Time : 6.   Dissolving  Capacity volume tank : 50 m 3 Motor agitator specification : Homogenezier : Input : 1.   Volume from xanthating : 2.   Initial temperature of xanthat liquid: 3.   Operation Condition Step process : 1.   First feeding : 2.   Initial dissolving : 3.   Second feeding : 4.   Wide gap cycle : 5.   Nallow gap cycle : 6.   Mid step : 7.   Discharge : Out put : Volume : Temperature Specification :

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Sep 11, 2019

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Sep 11, 2019
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