The typical vent-gas analysis from the recycle stream in an oxyhydrochlorination process for the production of dichloroethane (DCE) (British patent BP 1,524,449) is given below, percentages on volume basis. 0₂ 7.96, CO₂ + N₂ 87.6, CO 1.79, C₂H4 1.99, C₂H6 0.1, DCE 0.54 Estimate the vent gas calorific value.

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