Controlled alkali treatment in the recovery of methyl tertiary b

Details Controlled alkali treatment in the recovery of methyl tertiary b Controlled alkali treatment in the recovery of methyl tertiary b

1995-08-17

1997-04-01

Warden, Robert J.

Distillation: processes, separatory

Including addition of water or steam

And returning product of distillation step to distillation zone

203 3, 203 7, 203 85, 203 37, 203 78, 203 98, 203DIG23, 568699, B01D 340, B01D 342, C07C 4100

Patent

active

056162170

ABSTRACT:
In the manufacture of MTBE from TBA and methanol, acidic by-products formed during the etherification reaction are removed by fractionating the etherification reaction product in a first MTBE distillation column to provide a first lower boiling distillation fraction comprising isobutylene, MTBE, methanol and acidic by-products and a first higher boiling distillation fraction comprising methanol, TBA and water, fractionating the first higher boiling distillation fraction in a recycle distillation column to provide a lower boiling TBA recycle fraction and a higher boiling water fraction, recycling the higher boiling water fraction to the MTBE distillation column at a charge point above the charge point for the etherification reaction product, and adding aqueous sodium hydroxide to the recycled higher boiling water fraction in an amount sufficient to neutralize the acidic by-products charged to the MTBE distillation column.

REFERENCES:
patent: 3653835 (1972-04-01), Brandel
patent: 3670764 (1972-07-01), Hinton et al.
patent: 3990952 (1976-11-01), Katzen et al.
patent: 4334964 (1982-06-01), Prezelj et al.
patent: 5037511 (1991-08-01), Dornhagen et al.
patent: 5243091 (1993-09-01), Kruse et al.
patent: 5302253 (1994-04-01), Lessard et al.

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