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Patent
BP CHEMICALS Ltd | Date: 2015-06-12

A process for the co-production of acetic acid and dimethyl ether by dehydration-hydrolysis of a feed mixture of methanol and methyl acetate in the presence of at least one catalyst to generate a crude reaction product comprising acetic acid and dimethyl ether wherein the feed to said co-production process comprising methanol and methyl acetate comprises dimethyl ether in a total amount of 25 mol % or less based on the total feed.


Patent
BP Chemicals Ltd | Date: 2015-06-12

A process for the co-production of acetic acid and dimethyl ether with reduced formic acid content by distilling a mixture comprising dimethyl ether, methanol and methyl formate; separating methyl formate from the mixture to recover dimethyl ether and methanol; and catalytically reacting the methanol and methyl acetate to produce a reaction product of acetic acid an dimethyl ether.


Patent
BP CHEMICALS Ltd | Date: 2015-06-12

A catalytic dehydration-hydrolysis process for the co-production of acetic acid and dimethyl ether from a mixture of methanol and methyl acetate and water in which the amount of water fed to the process is controlled by the steps of dehydrating a methanol feed to provide a crude product comprising dimethyl ether, unconverted methanol and water; recovering therefrom a stream comprising dimethyl ether, water and methanol and a water stream; separating dimethyl ether from the dimethyl-ether containing stream to produce a methanol stream comprising methanol and water; and supplying to the dehydration-hydrolysis process at least part of the methanol stream and methyl acetate.


Patent
BP Chemicals Ltd | Date: 2017-02-22

A process for the co-production of acetic acid and dimethyl ether with reduced formic acid content by distilling a mixture comprising dimethyl ether, methanol and methyl formate; separating methyl formate from the mixture to recover dimethyl ether and methanol; and catalytically reacting the methanol and methyl acetate to produce a reaction product of acetic acid and dimethyl ether.


Patent
BP Chemicals Ltd | Date: 2017-03-08

A process for removing acetaldehyde from a mixture of methyl acetate, dimethyl ether and acetaldehyde comprising distilling mixtures derived from carbonylating dimethyl ether in the presence of a zeolite catalyst to generate an overhead stream depleted in acetaldehyde as compared to the feed mixture, a base stream depleted in acetaldehyde as compared to the feed mixture and a sidedraw stream enriched in acetaldehyde as compared to the feed mixture and withdrawing from the column the sidedraw stream enriched in acetaldehyde at a point above the feed point of the feed mixture to the column. Purified mixtures may be utilised as feedstock to processes for the co-production of acetic acid and dimethyl ether.


In processes for the hydrolysis of a methyl acetate with at least one of water and methanol in the presence of at least one Brnsted acid catalyst to produce acetic acid the performance of the catalyst is improved by using a methyl acetate feed in which the total amount of acetaldehyde and 1,1 dimethoxyethane impurities is maintained at 100 ppm wt or less calculated as mass equivalents of acetaldehyde.


A method for scrubbing off-gas generated in production units for the manufacture of acetic acid and an apparatus therefor. The method comprises supplying off-gas and acetic acid solvent at a tick-over flow rate to an acetic acid scrubbing unit, withdrawing off-gas from the scrubbing unit, supplying withdrawn off-gas to a methanol scrubbing unit, scrubbing the off-gas therein with methanol solvent and withdrawing scrubbed off-gas from the methanol scrubbing unit.


A process for the production of dimethyl ether from gaseous mixtures of carbon monoxide, hydrogen and methyl acetate contaminant comprising contacting a gaseous mixture of carbon monoxide, hydrogen and methyl acetate contaminant in a first scrubbing zone with a first portion of methanol to recover a scrubbed gaseous mixture depleted in methyl acetate and a first used methanol stream containing methyl acetate; contacting the scrubbed gaseous mixture in a second scrubbing zone with a second portion of methanol to recover a scrubbed gaseous mixture further depleted in methyl acetate and a second used methanol stream containing no methyl acetate or a reduced amount of methyl acetate compared to the first used methanol stream; dehydrating at least a portion of the second used methanol stream in the presence of at least one catalyst to produce a crude dehydration reaction product comprising dimethyl ether, unconverted methanol and water; recovering from the crude dehydration product a water stream comprising mainly water and 3 mol% or less acetic acid and a dimethyl ether stream.


Patent
BP Chemicals Ltd | Date: 2017-02-22

A catalytic dehydration-hydrolysis process for the co-production of acetic acid and dimethyl ether from a mixture of methanol and methyl acetate and water in which the amount of water fed to the process is controlled by the steps of dehydrating a methanol feed to provide a crude product comprising dimethyl ether, unconverted methanol and water; recovering therefrom a stream comprising dimethyl ether, water and methanol and a water stream; separating dimethyl ether from the dimethyl-ether containing stream to produce a methanol stream comprising methanol and water; and supplying to the dehydration-hydrolysis process at least part of the methanol stream and methyl acetate.


Patent
BP Chemicals Ltd | Date: 2017-02-22

A process for the co-production of acetic acid and dimethyl ether by dehydration- hydrolysis of a feed mixture of methanol and methyl acetate in the presence of at least one catalyst to generate a crude reaction product comprising acetic acid and dimethyl ether wherein the feed to said co-production process comprising methanol and methyl acetate comprises dimethyl ether in a total amount of 25 mol% or less based on the total feed.

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