Method for continuously producing 2,5-dihydrofuran

Details Method for continuously producing 2,5-dihydrofuran Method for continuously producing 2,5-dihydrofuran

2008-03-05

2011-10-18

Oh, Victor (Department: 1622)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S507000

Reexamination Certificate

active

08039645

ABSTRACT:
The method of the invention for continuously producing 2,5-dihydrofuran includes subjecting cis-2-butene-1,4-diol to liquid-phase dehydration-cyclization reaction in the presence of alumina, characterized in that the sum of the concentration of carbonyl compounds present in the reaction system and the concentration of acetal compounds present in the reaction system is controlled to fall within a range of 0.1 to 2 mol/L, provided that the concentration of the acetal compounds is calculated in terms of acetal groups, the concentrations being determined on the basis of the total amount of the reaction mixture. According to the method, 2,5-dihydrofuran, which is useful as a raw material or intermediate for producing pharmaceuticals, agrochemicals, raw materials of polymers, etc., can be continuously produced. The method can prevent inactivation of γ-alumina and is advantageous for long-term production on an industrial scale.

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