the formed carbonyl sulfide can be condensed the gas phase above the condenser is connected to a blower which can fed the gas phase into the reactor the air flow rate of the blower can be controlled to control the reaction rate for the production of carbonyl sulfide the blower is stopped at the beginning of the reaction to react the carbon monoxide which results in increase in the concentration of the carbonyl sulfide in the solution or suspension eventually absorption of the carbon monoxide stops when the blower is activated to feed the gas phase from the condenser into the reactor absorption of the carbon monoxide again occurs and carbonyl sulfide is condensed when the air flow rate is kept constant and carbon monoxide is added to maintain the set pressure the steady state is reached in the step sulfur is sequentially or continuously added into the reactor in an amount corresponding to the carbon monoxide consumption if sulfur is continuously added it is preferred to use molten sulfur although the activity of the catalyst is not significantly reduced optionally a minor amount of the catalyst may be further added to maintain the reaction rate although basically the organic solvent does not need to be exchanged or further added the organic solvent may be optionally added to maintain liquid level in the reactor the reflux condenser located prior to the condenser is used to reflux the organic solvent thereby substantially preventing loss of the organic solvent the temperature of the condenser.