Extractive distillation of C-4 hydrocarbons using modified alkox

Details Extractive distillation of C-4 hydrocarbons using modified alkox Extractive distillation of C-4 hydrocarbons using modified alkox

1980-05-19

1981-05-26

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Addition of material to distilland to inhibit or prevent...

For inhibiting or preventing a polymerization reaction

203 51, 203 53, 203 57, 203 58, 203 60, 203 65, 203 84, 252364, 585810, 585833, 585864, 585865, 585950, B01D 340, C07C 708

Patent

active

042696682

ABSTRACT:
The separation of butadiene-1,3 from other C-4 hydrocarbons of lesser degree of unsaturation by extractive distillation with alkoxynitrile or aqueous alkoxynitrile as selective solvent is carried out with improved selectivity, without appreciable formation of butadiene-1,3 polymer and with consequent savings in energy by adding to the alkoxynitrile or aqueous alkoxynitrile an organic cosolvent which is dimethyl sulfoxide, sulfolane, butyrolactone, N-methyl pyrrolidone, morpholine, or trimethyl phosphate and/or an inhibitor which is 2,4-dinitrophenol or 2,4-dinitro-ortho-cresol. The organic cosolvent is present in the selective solvent composition in an amount of 5 to 30 percent by weight and the inhibitor in an amount of 0.05 to 0.6 percent by weight.

REFERENCES:
patent: 3515762 (1970-02-01), Koide et al.
patent: 3551507 (1970-12-01), Sakuragi et al.
patent: 3681202 (1972-08-01), Funkhouser
patent: 3775493 (1973-11-01), De Simone et al.
patent: 3898135 (1975-08-01), Tidwell et al.
patent: 3988212 (1976-10-01), Watson
patent: 4081332 (1978-03-01), Hein

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