In one of the reactions there is evolution of Methyl Chloride( CH3Cl). Is there a safe method to scrub the gas, and what should be the scrubbing solution?
Looking through the technical literature I found that monochloromethane is more soluble in organic solvents than in water. You can absorb it by scrubbing with solvents or with water, as kenvlach suggests, and desorb it by use of heat, due to its high vapour pressure.
But one must be careful: although it is moderately flammable by itself, this chemical can form explosive mixtures with air (VP at 25 Celsius:5.75 kPa). The published flammability limits at 25 Celsius and 760 mm Hg: 10.7-17.2 vol % in air. Besides, it is considered moderately toxic: OSHA's TLV is 50 ppm for an 8-hr TWA.
It can be hydrolyzed in boiling caustic (NaOH) solutions: