Secondary condensation, chiller selection
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Toluene and MIBK need to be recovered during the company’s manufacturing process. In a 10-ton reactor, approximately 1.5 tons of solvent can be recovered, with a recovery time of 1 hour. Currently, 40-square-meter condenser tubes are used, and a water-ring vacuum pump is employed for solvent removal; however, if the removal process is too rapid, a slight odor of toluene appears, and there is a loss of around 150 kilograms of solvent. Therefore, a freezer and a condensing heat exchanger are intended to be added to carry out secondary condensation before the vacuum pump. I don’t know how effective it is. I would like to ask if anyone has any empirical suggestions regarding the required power of the chiller, the area of the heat exchanger, and the temperature of the chilled water.
The indicators for condensation recovery before the pump are fairly good; however, the gas flow velocity before the pump is high, which makes it common for gas to be entrained and escape. It is recommended to check the proportion of components in the exhaust gas coming from the 40 square meter outlet. If the proportion of non-condensable gases in the exhaust gas is low, this will be beneficial for the efficiency of the secondary condensation recovery system as well as for the requirements of the chiller unit. The temperature of chilled water generally needs to be around -10 degrees Celsius, which is sufficient. For the recovery of such solvents, my fin-type design can be considered; it achieves very good results in solvent recovery within the pharmaceutical industry.
Even by adding a freezer or a heat exchanger, it is not possible to ensure 100% recovery of toluene. It is recommended to modify the vacuum system by installing a condenser after the pump; a freezer can ensure the recovery of all solvents.
We use water ring pumps, and as a result, many solvents end up in the circulating water. It’s actually difficult to recover it after the pump
That’s why a pump is needed; substances like toluene and alcohol need to be recovered using a pump. Zero emissions can be achieved
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