Separation operation in a negative pressure distillation column
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The temperature of the side stream taken from the negative pressure distillation column (seventh tray) shows no change. The temperature of the sensitive plate (located above the stream extraction point) is lower than it was before shutdown, while the temperature at the top of the column is higher. The temperature at the bottom of the column is about 10 degrees lower, and the amount of steam used in the column has decreased by nearly one ton. Yet, why are the amounts of light and heavy components extracted higher?
Are there any changes in the feed components?