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Silica Content Costl

Methoxy benzoate in the presence of silica supported sodium hydrogen sulphate 17 and xv oxidation of pmethoxy toluene in the presence of a mixture of catalyst 18he r epor ted pr ocesses ha ve man y dr awbac ks lik e pr oblems in disposal of hea vy metals in the ef fluent, use of costl y r eagents,.