EP0484020A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for purifying acetic acid and/or acetic anhydride
Assignee: BP PLC
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Filing: 1991-10-18
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Granted: —
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Expires: 2011-10-18
Abstract
Abstract A process for removing iodide derivatives from liquid acetic acid and/or acetic anhydride comprises contacting the liquid acetic acid and/or acetic anhydride with a strong acid cation exchange resin having from about 4% to about 12% crosslinking, a surface area in the proton exchanged form of less than 10m²g⁻¹ after drying from the water wet state and a surface area of greater than 10m²g⁻¹ after drying from a wet state in which water has been replaced by methanol. The resin has at least one percent of its active sites converted to the silver form preferably from 30 to 70 percent.
Inventors
- 👤 Michael David Jones
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 15:54
CPC Classifications
C; C07; C07C; C07C53/00; C07C53/08; C07C51/00; C07C51/42; C07C51/47; C07C51/54; C07C51/573; C07C53/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
A process for removing iodide derivatives from liquid acetic acid and/or acetic anhydride which comprises contacting the liquid acetic acid or acetic anhydride with a strong acid cation exchange resin having from about 4% to about 12% crosslinking, a surface area in the proton exchanged form of less than 10m²g⁻¹ after drying from the water wet state and a surface area of greater than 10m²g⁻¹ after drying from a wet state in which water has been replaced by methanol, said resin having at least one percent of its active sites converted to the silver form.
Claim 2
Dependent Claim
20 words
A process as claimed in claim 1 wherein the strong acid cation exchange resin has from 6 to 10% crosslinking.
Claim 3
Dependent Claim
55 words
A process as claimed in claim 1 or claim 2 wherein the strong acid cation exchange resin has a surface area of less than 8 m²g⁻¹ after drying from the water wet state and a surface area of greater than 15m²g⁻¹ after drying from a wet state in which water has been replaced by methanol.
Claim 4
Dependent Claim
30 words
A process as claimed in claim 1 wherein from 10 to 90 percent of the active sites of the strong acid cation exchange resin are converted to the silver form.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 5 wherein from 30 to 70 percent of the active sites of the strong acid cation exchange resin are converted to the silver form.
Claim 6
Dependent Claim
30 words
A process as claimed in claim 1 wherein the liquid acetic acid and/or acetic anhydride used as feedstock contains up to about 500 parts per billion of the iodide derivatives.
Claim 7
Dependent Claim
44 words
A process as claimed in claim 1 wherein contact between the acetic acid and/or acetic anhydride and the strong acid cation exchange resin is achieved by passing the acetic acid and/or acetic anhydride through a fixed bed of the strong acid cation exchange resin.
Claim 8
Dependent Claim
24 words
A process as claimed in claim 7 wherein the fixed bed of the strong acid cation exchange resin is graded by backflushing before use.
Claim 9
Dependent Claim
36 words
A process as claimed in either claim 7 or claim 8 wherein the flow rate of acetic acid and/or acetic anhydride through the fixed bed is in the range 5 to 15 bed volumes per hour.
References Cited (Backward Citations)
No citation records indexed.
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