Compositions – X-ray or neutron shield
Patent
1974-12-19
1976-08-03
Shine, W. J.
Compositions
X-ray or neutron shield
252475, B01J 2302, B01J 2334
Patent
active
039728366
ABSTRACT:
There are provided alkylation catalysts comprising magnesium oxide mixed with and bonded by manganese oxides. These are used in processes for the vapor phase ortho-alkylation of phenols with an alcohol. The present catalysts are advantageous in that they provide a substantially increased total useful life, a reduced induction period for maximum reaction selectivity, elimination of catalyst losses in comparison with the powders or weakly sintered composites of the prior art and increased selectivity for ortho-substitution. Treatment of the new catalysts with methanol vapor before use enhances their activity in converting phenols to 2,6-xylenol and results in a significant increase in production rate.
REFERENCES:
patent: 3901947 (1975-08-01), Enomoto et al.
General Electric Company
Hedman Edward A.
Mufatti William F.
Shine W. J.
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