Accordingly, the invention provides a process for the preparation of an alkyl methacrylate, which comprises: a) selectively removing propadiene from a C3 mixture comprising {TAIL ~ a mixture} of propyne and propadiene that has been obtained from an ethene cracker, a catalytic cracker or {HEAD ~ 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 the thus treated propyne feed with carbon monoxide and an alkanol in the presence of a carboxylation catalyst 
Accordingly , the invention provides a process for the preparation of an alkyl methacrylate , which comprises : a ) selectively removing propadiene from a C3 mixture comprising { TAIL ~ a mixture } of propyne and propadiene that has been obtained from an ethene cracker , a catalytic cracker or { HEAD ~ 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 the thus treated propyne feed with carbon monoxide and an alkanol in the presence of a carboxylation catalyst
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