Accordingly, the invention provides {HEAD ~ a process} for the preparation of an alkyl methacrylate, which comprises: a) selectively removing propadiene from a C3 mixture comprising a mixture of propyne and propadiene that has been obtained from an ethene cracker, a catalytic cracker or an LPG dehydrogenation process, to afford a propyne feed in which the ratio of propyne to propadiene is at least about 6:1, and b) contacting {TAIL ~ the thus treated propyne feed} with carbon monoxide and an alkanol in the presence of a carboxylation catalyst 
comprises contacting
Accordingly , the invention provides { HEAD ~ a process } for the preparation of an alkyl methacrylate , which comprises : a ) selectively removing propadiene from a C3 mixture comprising a mixture of propyne and propadiene that has been obtained from an ethene cracker , a catalytic cracker or an LPG dehydrogenation process , to afford a propyne feed in which the ratio of propyne to propadiene is at least about 6:1 , and b ) contacting { TAIL ~ the thus treated propyne feed } with carbon monoxide and an alkanol in the presence of a carboxylation catalyst
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