Tanduay Distillery Labor Union vs NLRCFull description
Distillation In the distillation section Extra Neutral Alcohol and Technical Alcohol are refined by
using eight distillation columns. The clarified wash coming from the fermentation section is sent through the Bear heater (shell and tube heat exchanger) and heated to about 65C 0 by 0
vapour coming from top of the Analyser column. Again it heated to 92 C in fermented preheater by spent wash from bottom of the Analyser column. Then wash is fed to Degasifying column top.
Degasifying column Clarified wash is firstly first ly transfer to degasifying column. Degasifying column is located at top of the Analyzer column co lumn.. The degasifying column is used principally for r emoval of non no n condensable present in the clarified wash. Top product of the degasifying column is sent as feed of Aldehyde column. Bottom product of degasifying column is sent to the feed of Analyzer column through gas separator. Degasifyingcolumn has sieve plates. Because of that the clarified wash are very high in viscosity and viscous liquids can easy to pass through sieve plate. Column details
Number of plate
10
Feed plate
01
Type of plate
sieve plate
Temperature top
90 ~ 92 °C
Temperature bottom
≈94 °C
Height
7.279 m
Tray spacing
550mm
Insulation thick
50 mm
Design pressure
0.5 kg/cm²
Operating pressure
0.3 kg/cm²
Figure 2.23: Degasifying column co lumn & analyzer column
Analyzer column
The feed for analyzer column is taking from bottom product of the Degasifying column. It is fed to the top plate of the Analyzer column through a gas separator. Analyzer column strips off alcohol from the spent wash. The bottom product of the analyzer column(spent wash) in this column is send to spent wash tank. The top product of the Analyzer column is sent through liquid separator to beer heater. Separatedvapor is sent to shell side of the Beer heater to heated clarified wash to 65°C. In Beer heater non condensable gases is sent to vent condenser and then send to first Aldehyde condenser. After that non condensable gas is send from first Aldehyde condenser to atmosphere. The condensed liquid in Beer heater and vent condenser are sent to the Purifier column through a liquid separator. Steam is directly introduced in to the analyzer column and no reboilers are used. Spent wash is a bigger problem to the distillery and it can’t be directly ejected to the environment according to environmental standards. Column details
Number of plate
18
Feed plate
01
Type of plate
Valve plate
Temperature top
94 °C
Temperature bottom
105~107 °C
Height
11.215 m
Tray spacing
550mm
Insulation thick
50 mm
Design pressure
0.5 kg/cm²
Operating pressure
0.3kg/cm²
Purifier column Purifier column is operated on the principle of hydro extraction and is principally used for removal of the low boiling impurities. The feed of Purifier column is taken
from
feed
bottle
of
Purifier
column.
Condensate of Beer heater and vent condenser are sending to feed bottle of Purifier column. And other feed line of that bottle is pumped from bottom vessel of Head concentrated column. DM water is fed to top Fi ure 2.24: Purifier column
of the column. Most of low boiling impurities are removed in this column. The column is heated by using a reboiler. Bottom product of this column is sent to the first purifier condenser andnon condensable gases are sentto the second Purifier condenser in that condenser. After the second condenser non condensable gases are sent to the at mosphere Column details
Number of plate
50
Feed plate
29
Type of plate
Valve plate
Temperature top
90 °C
Temperature bottom 92 ~ 93 °C
Height
12.576 m
Tray spacing
250/200mm
Insulation thick
50 mm
Design pressure
1 kg/cm²
Operating pressure
0.3 kg/cm²
Aldehyde column
Aldehyde column is used to remove Aldehydes and ketones from alcohol mixer. Feed is taken fromthe top of the Degasifying column and is fed to plate number 16. The column is heated by direct steam. Bottom product of that column is sent to the Head diluter. Top product is sent to the second Aldehyde condenser. In that condenser non condensable gasses are sent to atmosphereand condensate liquid is sent through vapor bottle to Head diluter. Disengagement gases and liquid are fed back to Aldehyde column as reflux.
Figure 2.25: Aldehyde column
Column details
Number of plate
30
Feed plate
16
Type of plate
Valve plate
Temperature top
76 ~ 78 °C
Temperature bottom
93 ~ 95 °C
Height
7.275 m
Tray spacing
200mm
Insulation thick
50 mm
Design pressure
1.2 kg/cm²
Operating pressure
0.5 kg/cm²
Design temperature
120 °C
Heads concentration column The main task of HCC column is to concentrate the top products of several columns. Feed of this column is taken from the Head diluter. A Lot of entering linesis connected to the Head diluter.
Top of Aldehyde column
Bottom of Aldehyde column
Top of rectifier column
Top of fusel oil concentration column
From first Aldehydevapor bottle
Top product of the HCC is sent to first heads cool condenser. In that condenser non condensable gases are sent to second head cool condenser. After the second condenser non condensable gasses are sent to the atmosphere. The liquid separated in those t wo condensers are sent to technical alcohol receiver. HCC is heated by using areboiler. Bottom product of HCC is sent to Head
Figure 2.26:Heads concentration column
bottom vessel and then it is pumped to the feed bottle of Purifier column. Column details
Number of plate
45
Feed plate
24
Type of plate
Valve plate
Temperature top
78 °C
Temperature bottom
90 ~ 92 °C
Height
11.325 m
Tray spacing
200/250mm
Insulation thick
50 mm
Design pressure
0.45 kg/cm²
Operating pressure
0.3 kg/cm²
Design temperature
120 °C
Rectifier cum exhaust column
For this column feed is taken from bottom of Purifier column. High boiling impurities are removed in rectifier column and alcohol mixer is more concentrated in this column. Bottom product of the column is sent in to the spent lees tank. A spent lee is used to heat DM water in. the column is heated by using direct steam. Column details
Number of plate
78
Feed plate
18
Type of plate
Valve plate
Temperature top
78 °C
Temperature bottom 105 ~ 105 °C
Height
19.100 m
Tray spacing
225mm
Insulation thick
50 mm
Figure 2.27:Rectifier cum exhaust column
Design pressure
0.5 kg/cm²
Operating pressure
0.5 kg/cm²
Design temperature
120 °C
Fusel oil concentration column The main task of FOC is to fully concentrate and separationof partially separated fusel oil (from Rectifier fusel oil decanter and Purifier fusel oil decanter). Feed is taken from the liquid separators of other two fusel oil decanters. Top product of the column is sent to the FOC condenser. In that condenser none condensable are sent to atmosphere and condensates sent to Head diluter through a liquid separator. Separated fusel oil from the fusel oil decanter is sent to the fusel oil storage tank through flow meters. Fusel oil concentration column is heated by using direct steam. Column details
Number of plate
50
Feed plate
25
Type of plate
Valve plate
Temperature top
78 °C
Temperature bottom
103 °C
Height
11.175 m
Tray spacing
200mm
Insulation thick
50 mm
Design pressure
0.5 kg/cm²
Figure 2.28 :Fusel oil concentration column
Refining column In refinery column alcohol is concentrated up to 96.3 v/v%. Finally concentrated alcohol is called Extra Neutral Alcohol. For Refinery column feed is taking from the Rectifier cum exhaust column. Top product of Refinery column is sent to first refinery condenser and in this condenser non condensable are sent to second refinery condenser. At second refinery condenser non condensable are sent to atmosphere. Extra Neutral Alcohol is taken as the bottom product of this column. It is passed through a heat exchanger (ENA cooler) for cooling the ENA. After that cooled ENA is passed through a carbon chamber. Dissolved oxygen from ENA is absorbed in carbon chamber. After that concentrated ENA sentto ENA storage tank through flow meters. Column details
