Etherification of phenol
AssigneeExxon Research & Engineering Co.
InventorDan Farcasiu
Life of this patent
Estimating the term…
Abstract
Phenols are etherified to products such as anisole by contacting said phenols with a low molecular weight alcohol or ether in the presence of an acid catalyst comprising a sulfated composite of one or more transition metal oxides on alumina. The process of this invention may be used to etherify, in situ, phenols present in synthetic fuel feedstocks, such as phenols present in naphthas derived from coal liquefaction. Preferred catalysts comprise oxides of tungsten, hafnium, and mixtures thereof on a high surface area gamma alumina support containing at least 2 wt. % sulfate ions.
Claims24
A process for etherifying phenols which comprises reacting said phenols, at elevated temperature, with a reactant selected from the group consisting essentially of an alcohol, ether and mixtures thereof in the presence of an acid catalyst comprising a sulfated composite of an oxide of a transition metal selected from the group consisting essentially of W, Hf, Nb, Ta, Zr and mixtures thereof on a support comprising a relatively high surface area alumina for a time sufficient to convert at least a portion of said alcohol feed to its corresponding ether with said reactant.
A process for etherifying a feed containing one or more phenols which comprises contacting said feed, at elevated temperature, with a reactant selected from the group consisting essentially of aliphatic alcohols, aliphatic ethers and mixtures thereof in the presence of an acid catalyst comprising a sulfated composite of an oxide of a metal selected from the group consisting essentially of W, Hf, Nb, Ta, Zr and mixtures thereof on a high surace area alumina support, for a time sufficient to convert at least a portion of said alcohol present in said feed to its corresponding ether with said reactant.
A process for etherifying phenols present in a naphtha feed derived from the liquefaction of coal, said process comprising contacting said feed with a reactant selected from the group consisting essentially of (a) a low molecular weight aliphatic alcohol, (b) a low molecular weight ether and mixture thereof, at a temperature of at least about 200.degree. C. in the presence of an acid catalyst comprising a sulfated and calcined composite of a transition metal oxide selected from the group consisting essentially of oxides of W, Hf, Nb, Ta, Zr and mixtures thereof on a gamma alumina support, for a time sufficient to convert at least a portion of said phenols in said feed to their corresponding ether products with said reactant.
A process for etherifying phenol comprising contacting said phenol with a one to four carbon atom reactant selected from the group consisting essentially of alkyl alcohol, alkyl ether and mixtures thereof at a temperature of at least about 200.degree. C. in the presence of an acid catalyst comprising a sulfated composite of transition metal oxide selected from the group consisting essentially of oxides of W, Hf, Nb, Ta, Zr and mixtures thereof on a .gamma.-Al.sub.2 O.sub.3 support for a time sufficient to form an ether product boiling below about 460.degree. F. from the phenol and reactant and wherein said catalyst contains at least about 2 wt. % sulfate ions.
Dependencies are inferred from the claim text.