This invention provides a process for producing tetrahydrofuran by (1) the condensation of 2-methyl-1,3-propanediol with acrolein to form 2-vinyl-5-methyl-1,3-dioxane; (2) the conversion of the 2-vinyl-5-methyl-1,3-dioxane under hydroformylation conditions to 3-(5'-methyl-1',3'-dioxane)propionaldehyde; and (3) hydrogenation of the propionaldehyde derivative under acidic conditions to yield tetrahydrofuran.
Production of (1,3-dioxane)propionaldehyde derivatives
申请人:Celanese Corporation
公开号:US04079064A1
公开(公告)日:1978-03-14
This invention provides a process for producing 3-(1',3'-dioxane)propionaldehyde or 3-(alkyl-1',3'-dioxane)propionaldehyde in over 70 weight percent yield by the reaction of 2-vinyl-1,3-dioxane or 2-vinyl-alkyl-1,3-dioxane with hydrogen and carbon monoxide under hydroformylating conditions.
Alcohols and/or alpha, beta or alpha, gamma diols having at least four carbon atoms are reacted with aldehyde or dialdehyde compounds at a temperature ranging from 0.degree. - 100.degree. C in the presence of an acid catalyst to produce an organic-aqueous two-phase liquid product containing the acetal in the organic phase.
Rhodium recovery from hydroformylation still heel with triaryl phosphate ligand
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0000665A1
公开(公告)日:1979-02-07
A process for recovering rhodium present in a still heel from the hydroformylation of an unsaturated hydrocarbon wherein rhodium and a triaryl phosphite ligand were used by a process comprising
a) pretreating the still heel with a compatible organic solvent, at least 5 ml of water per 100 g of still heel, oxygen gas or a precursor thereof and sufficient base to produce a pH of 2 to 7 in the reaction mixture after rhodium precipitation;
b) heating to a temperature of from 0° to 80°C to oxidize the triaryl phosphite ligand to the corresponding phosphate compound;
c) heating the mixture from b) for from about 15 minutes to about 120 minutes at about 115°C to about 175°C to precipitate the rhodium and optionally purifying the rhodium from c) by
d) separating the rhodium precipitate;
e) washing the rhodium precipitate with a solvent-acid solution at a pH of to4;
f) treating the rhodium precipitate with an alkaline reducing solution to reduce the trivaient rhodium impurity to zero valent rhodium;
g) quenching the rhodium with glacial acetic acid;
h) separating the rhodium;
i) washing the rhodium with an acid solution at a pH of 3 to 4;
j) drying the rhodium in an inert atmosphere at from 250° to 400°C; and
k) oxidizing the rhodium at a temperature of from 300° to 900°C to convert the rhodium to Rh2O3.
Process of hydroformylating cyclic acrolein acetals
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0003753A1
公开(公告)日:1979-09-05
A process for hydroformylating a cyclic acrolein acetal to form the corresponding cyclic acrolein acetal aldehyde, said process comprising conducting said hydroformylation in the presence of carbon monoxide, hydrogen, rhodium complex catalyst and 1-3%of excess triphenyl phosphite ligand based on the acetal at a pressure of carbon monoxide of from 5-20 psia and a pressure of hydrogen of from 10- 400 psia maintained with a gas having a H2:CO ratio of from 1:1-20:1 and a temperature of from 100-115°C, the rhodium content of said catalyst being 1-50 ppm of rhodium based on the acetal.