Design Capacity: 240 metric tons/day
Operating Capacity: 440 metric tons/day
Upgrades: 2006 – increased capacity to 440 metric tons/day by replacing the Flash tan vessel and few heat exchangers to larger size
2008 – Installed new Honeywell DCS
Area Required: 200 mx 20m = 4,000 sq.m.
Electric Cycle: 60 Hz.
Acetic Acid is produced by continuous reaction by carbon monoxide and methanol at 190°C (temperature) and 27.4 kg/cm2 (pressure)
A catalyst system consisting of a rhodium complex (the catalyst) and methyl iodide (Mel)
The acetic acid produced in the reactor is removed by flashing tank (MD-301). The liquid is returned to the reactor. The vapor has flashing to a purification system (Area 400)
Light end column (AS-401) takes most of the methyl iodide and some water overhead , most of the HI out the bottom and acetic acid out a side-stream.
Drying column(AS-402) dries the acid to less than 650 ppm water and removed the HI to less than 1 ppm. The HI is reacted with methanol and removed overhead as MeI.
Heavy ends column(AS-403) removes the trace light ends as an overhead stream and propionic acid and other of heavy ends as a bottom waste stream.
3. Light and Recovery
High pressure absorber(AS-501):The high pressure absorber recovers and the methyl iodide in the off-gases from the reaction area. The clean gases are sent to flare.
Low end Recovery(AS-502):The low pressure absorber recovers and the methyl iodide in the off-gases from the purification area .The clean gases are sent to flare.
Stripper(AS-503):Methyl iodide is removed from acetic acid used in the absorbers in a stripping column. The methyl iodide vapor is send back to the purification area for recovery.
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