1. Phosgene is nasty stuff. It is often referred to as mustard gas since it was
ID: 938214 • Letter: 1
Question
1. Phosgene is nasty stuff. It is often referred to as mustard gas since it was used in World War I. It has somewhat more peaceful uses, one of which is as a building block for the insecticide Sevin (1naphthyl methyl carbamate). Sevin replaced DDT as a major insecticide due to its considerably smaller half life, which makes it more environmentally friendly (not to bugs though), and because it doesn't accumulate in vertebrates. It is still heavily used today as a pesticide.
a) Write the necessary formation reaction for the production of phosgene from carbon monoxide and chlorine gas.
b) Calculate the standard heat of reaction.
c) Calculate the heat of reaction at 100 C.
2. Calculate the adiabatic flame temperature for acetylene in 20 mol% excess oxygen
Explanation / Answer
The production of phosgene from carbon monoxide and chlorine gas is given as:
CO + Cl2 COCl2 (Hrxn = 107.6kJ/mol)
The reaction is exothermic; therefore the reactor must be cooled. Typically, the reaction is conducted between 50 °C and 150 °C.
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