Process for hydrogenation of diacetoxybutene
AssigneeMitsubishi Chemical Industries Limited
InventorsJun Toriya, Ken Shiraga, Takeru Onoda, Akihisa Ohno
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Abstract
Diacetoxybutane is prepared by a process for hydrogenating diacetoxybutene in the presence of a supported hydrogenation catalyst comprising catalytically reacting diacetoxybutene with hydrogen continuously in an insulation reaction apparatus utilizing a fixed-bed of said hydrogenation catalyst, withdrawing the reaction effluent continuously from said reaction apparatus, circulating at least a part of said reaction effluent to said reaction apparatus while controlling the temperature of influx of said reaction apparatus at a temperature lower than the temperature of efflux from said reaction apparatus by 5.degree. to 100.degree. C.
Claims10
In a process for preparing diacetoxybutane by admitting feed material containing diacetoxybutene into an insulated reaction vessel containing a fixed-bed hydrogenation catalyst, continuously hydrogenating said diacetoxybutene over said catalyst at a temperature of room temperature-200.degree. C., continuously withdrawing a reaction effluent from said reaction vessel and recovering the product diacetoxybutane therefrom, the improvement comprising:
- circulating a portion of said withdrawn effluent, with or without gaseous phase-liquid phase separation, in an amount of 0.1 to 100 parts by weight per part of said effluent from which diacetoxybutane is recovered to the inlet of said reaction vessel to mix with the feed material, said portion to be circulated being cooled either prior to or after mixing with said feed material;
- and
- controlling the temperature of the feed mixture so that the temperature of the feed mixture is 5.degree.-100.degree. C. less than the temperature of said withdrawn effluent, thereby maintaining the temperature of the hydrogenation within said range.
Dependencies are inferred from the claim text.