BP Chemicals Ltd.

Hull, United Kingdom

BP Chemicals Ltd.

Hull, United Kingdom
SEARCH FILTERS
Time filter
Source Type

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at a tick-over flow rate to an acetic acid scrubbing unit, withdrawing off-gas from the scrubbing unit, supplying withdrawn off-gas to a methanol scrubbing unit, scrubbing the off-gas therein with methanol solvent and withdrawing scrubbed off-gas from the methanol scrubbing unit.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 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.


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.


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.


In process 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 pm wt or less calculated as mass equivalents of acetaldehyde.


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

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.


Patent
BP Chemicals Ltd | Date: 2017-06-14

A method of operating a heavy ends column in an acetic acid production unit, said production unit comprising at least a reaction section, a light ends recovery section comprising a light ends distillation column, and a heavy ends column, wherein a stream comprising acetic acid and propionic acid obtained from the light ends recovery section is fed to the heavy ends column through a feed inlet positioned at an intermediate point in the heavy ends column, a product stream comprising essentially acetic acid is withdrawn from the heavy ends column through a sidedraw product outlet position above the feed inlet, and a product stream comprising the propionic acid is withdrawn from the heavy ends column through a heavy product outlet positioned below the feed inlet, wherein the heavy ends column is operated under conditions such that the pressure in the heavy ends column above the feed inlet is lower than the pressure of the stream comprising acetic acid and propionic acid that is fed to the heavy ends column, and wherein the head pressure of the heavy ends column is below 1.0 bara, the number of theoretical separation stages between the feed inlet and the sidedraw product outlet is at least 5, preferably at least 7, more preferably at least 10, and the pressure drop in the part of the heavy ends column between the feed inlet and the sidedraw product outlet is at most 10 mbar per theoretical separation stage.


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.

Loading BP Chemicals Ltd. collaborators
Loading BP Chemicals Ltd. collaborators