Functional uses of γ-butyrolactone

γ-butyrolactone, synthetic fragrance

Maleic anhydride hydrogenation method This method is an advanced process developed in the 1970s. It uses a one-stage hydrogenation reaction to produce tetrahydrofuran and γ-butyrolactone in any ratio. The usual ratio is four Chlorofuran:γ-butyrolactone=3-4:1. There are many manufacturing enterprises, but the scale is small, with an average capacity of 300t/a. The production capacity of this method accounts for 30% of the total domestic production capacity. 

1,4-Butanediol dehydrogenation method The reactor is of tubular type and is filled with flake copper catalyst (with zinc oxide as carrier). The reaction temperature is controlled at 230-240°C. The crude γ-butyrolactone, the reaction product, is distilled under reduced pressure to obtain the finished product, with a yield of more than 77%. 

 It uses 1,4-butanediol as raw material, preheats it first, reacts with hydrogen in the presence of a copper catalyst, and controls the temperature at 230 to 240°C to obtain crude γ-butyrolactone, which is then distilled under reduced pressure. . 

At present, succinic anhydride has been obtained by hydrogenation using the maleic anhydride method, and then further hydrogenated and dehydrated to obtain the product. 

The allyl alcohol method uses aromatic hydrocarbons as solvents and rhodium complexes as catalysts to hydroformylate allyl alcohol and raw gas (H2+CO), and then catalyze hydrogenation with skeleton nickel to obtain 1,4-butanediol, which can then be produced. Obtain γ-butyrolactone and co-produce tetrahydrofuran. 

Furfural method: DuPont decarbonylates furfural in water vapor to obtain furan, which is further oxidized to generate γ-butyrolactone.

Ethylene acetic acid method: Ethylene and acetic acid are catalyzed by 120°C MPa and manganese acetate or manganese dioxide to produce finished products.

 β-Formylpropionate method β-formylpropionate is produced by hydrogenation reduction, hydrolysis, dehydration and cyclization.