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Control Technology

Predicting the Performance of VOC Condensers

Pages 404-407 | Received 14 Aug 1989, Accepted 26 Oct 1989, Published online: 06 Mar 2012
 

Abstract

Volatile organic compounds (VOC) are commonly released from process vents and equipment leaks. These discharges are a threat to the environment, and cost manufacturers millions of dollars in added raw material costs. For these reasons, one may be confronted with the task of evaluating alternatives for reducing VOC emissions from a process plant.

There are two basic approaches for reducing VOC emissions: a) changing the process, or b) installing control equipment.

Methods for changing the process include replacing highly volatile solvents with less volatile ones, making piping changes to reduce the number of vents, tightening the process to eliminate open tanks and leaks, altering process temperature and pressure conditions, etc. Equipment that is applicable to VOC emission control includes incineration, carbon adsorption, scrubbing and condensation.

This article addresses the application of condensers to process vents. A computer spreadsheet model is described, providing a quick screening which indicates whether a vent condenser might be a viable option for controlling emissions. The template provides, for each of a range of condensing temperatures, estimates for the amount of VOC that will be condensed, the condenser size and the tons of refrigeration required.

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