WO1997020610A1 - Reversed phase chromatographic process - Google Patents
Reversed phase chromatographic process Download PDFInfo
- Publication number
- WO1997020610A1 WO1997020610A1 PCT/IE1996/000077 IE9600077W WO9720610A1 WO 1997020610 A1 WO1997020610 A1 WO 1997020610A1 IE 9600077 W IE9600077 W IE 9600077W WO 9720610 A1 WO9720610 A1 WO 9720610A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- solvent
- column
- decoloriser
- nonionic
- regenerating
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C237/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups
- C07C237/28—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atom of at least one of the carboxamide groups bound to a carbon atom of a non-condensed six-membered aromatic ring of the carbon skeleton
- C07C237/46—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atom of at least one of the carboxamide groups bound to a carbon atom of a non-condensed six-membered aromatic ring of the carbon skeleton having carbon atoms of carboxamide groups, amino groups and at least three atoms of bromine or iodine, bound to carbon atoms of the same non-condensed six-membered aromatic ring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C231/00—Preparation of carboxylic acid amides
- C07C231/22—Separation; Purification; Stabilisation; Use of additives
- C07C231/24—Separation; Purification
Definitions
- This invention relates to a process for the reversed phase chromatographic decolorisation, separation andpurification of water-soluble nonionic contrast media compounds from solutions containing nonionic compound impurities.
- the object of the invention is to provide an improved process for the decolorisation, reversed phase chromatographic separation and purification of water-soluble nonionic contrast media compounds on a factory scale in which the waste disposal of solvent is minimised.
- the purified decoloriser regenerating solvent is recycled to provide at least a portion of the regenerating solvent for the decoloriser column.
- the decoloriser regenerating solvent is purified by distilling the regenerating solvent containing impurities to produce a distillate of substantially pure solvent.
- the substantially pure solvent is mixed with further fresh solvent.
- the process includes the steps of:-
- the recovered regenerating solvent is recycled to provide at least a portion of the regenerating solvent for the purification recovery column.
- the solvent which has passed through said column is removed by:-
- distilling said mixture to provide a distillate of substantially pure solvent and a bottoms product comprising the aqueous solution containing the nonionic contrast media compound and nonionic compounds as impurities.
- the substantially pure solvent is mixed with further fresh solvent.
- the recovered regenerating solvent is mixed with the decoloriser regenerating solvent prior to purification.
- the solvent is a lower alkanol, especially methanol .
- the novel process of the present invention is applicable to the general decolorization and separation of nonionic compound impurities from water-soluble, nonionic contrast media compounds, nonionic nuclear diagnostic imaging compounds or alternatively, MRI agents.
- the nonionic contrast media compounds include x-ray contract media compounds such as N,N'-bis(2,3-dihydroxypropyl)-5-[N-(2- hydroxyethyl ) glycol amido] -2 , 4 , 6-triiodo-isophthala- mide(ioversol) , N,N'-bis ⁇ 2 ,3-dihydroxypropyl )-5-[N-(2, 3- di hydroxypropyl ) acet amido] -2,4, 6-triio do isophthal- amide ( iohexol ) , N,N ' -bis ( 1 , 3-dihydroxypropyl ) -5-lactylamido- 2,4, 6-triiodoisophthalamide( iopamid
- nonionic contrast media compounds includes, and the present invention is applicable to, nonionic magnetic resonance imaging (MRI) agent ligands and neutral (or nonionic) metal complexes of their ligands with suitable metals from the first, second, or third row transition elements or the lanthanide or actinide series.
- MRI magnetic resonance imaging
- neutral (or nonionic) metal complexes of their ligands with suitable metals from the first, second, or third row transition elements or the lanthanide or actinide series MRI
- Typical ligands include N , N " -bis [ N- ( 2 , 3 - dihydroxypropy 1 ) carbamoy Imethyl ] diethylenetr iamine-N , N ' , N " - triacetic acid, N,N'-bis[N-( 2 , 3-dihydroxypropyl ) carbamoylmethyl]ethylene-diamine-N,N'-diacetic acid, N,N'"- bis [ N- ( 2 -hydroxyethyl ) carbamoy Imethyl ] triethylenetet raamine- N,N' ,N" ,N' "-tetraacetic acid, N,N"-bis[N-( 1-hydroxymethyl- 2 , 3-dihydroxypropyl ) car-bamoy Imethyl ] diethylenetr iamine- N,N' ,N"-triaacetic acid and N , N ' -bis [ N- ( 2- hydroxyethyl ) carbam
- the contrast media compound is the nonionic X-ray contrast media compound N , N ' -bis ( 2 , 3-dihydroxypropyl ) -5- [ N- ( 2 - hydroxyethyl)glycolamido]-2,4,6-triiodoisophthaiamide (loversol) described in US 4,396,598.
- Fig. 1 is a schematic flow diagram of an improved recovery process according to the invention.
- Fig. 2 is a flowchart of some details of the process.
- the first step is hydrolysis 1, followed by decolorisation 2, deionisation 3 and evaporation 4.
- the nonionic contrast media compound is purified in step 5, concentrated in a two stage evaporation process in steps 6a and 6b and dried in step 7 to provide a finished nonionic contrast medium product 8.
- Methanol from the purification step 5 is delivered along line 13 to a primary methanol recovery plant 12 and the recovered methanol is recycled, typically either along line 14 to the purification column 5 or along line 14a for use in regenerating the decoloriser column 2.
- the packing in the decoloriser column 2 is regenerated by washing with a methanol wash stream 20 and waste methanol 21 from the regeneration of the decoloriser column 2 is recovered in a methanol recovery plant 25 which will be described in more detail below.
- the methanol recovered in the methanol recovery plant 25 is delivered along a line 26 for use as a regenerating solvent for the decoloriser column 2.
- a waste stream 30 from the primary methanol recovery plant 12 contains some nonionic contrast medium compound which is recovered in a recovery process 31 as described in our co ⁇ pending application filed simultaneously with this application. Waste material from the recovery plant 31 is deiodinated at 42 prior to waste treatment 45. As part of the recovery process 31, a purification column is regenerated using a methanol stream 32 and waste methanol 33 from the recovery process 31 is also passed to the methanol recovery plant 25. The purified methanol from this stream is recycled along line 34 to provide solvent for use in regenerating the purification column used in the recovery process 31.
- the methanol recovery plant 25 is shown in more detail in Fig. 2. Waste methanol 21,33 from the decoloriser column 2 and/or from the recovery process 31 is delivered into a holding tank 35. From the tank 35, the methanol is pumped by a pump 36 to a continuous distillation column 37 for recovery.
- the system is inerted at startup and remains under a constant blanket of nitrogen during operation.
- the bottom 38 of the column 37 acts as a sump to collect the still bottoms and provide a head of liquid for a still bottoms recirculation pump 39.
- the still bottoms are heated by forced circulation through a shell and tube heat exchanger 40.
- the shell and tube heat exchanger 40 uses process steam reduced to 3 to 4 Bar to heat the still bottoms.
- the still bottoms are intermittently pumped out by the pump 39 to a bottoms hold tank 41.
- the still bottoms are transferred from the holding tank 41 to a deiodinator 42 using a bottoms transfer pump 43. After deiodination, the still bottoms may be released to waste treatment 45.
- Methanol vapours generated in the distillation column 37 are condensed in an overhead condenser 50 using process cooling water supply.
- the condensed methanol then passes through an in-line UV detector 51 which checks for iodinated compounds in the condensed methanol. If the UV detector 51 detects the presence of iodinated compounds the distillation column 37 is put into total reflux until the distillate is clear.
- the condensed methanol is collected in a reflux pot 52.
- a forced reflux system with pump 53 and control valve (not shown) is used to ensure that the desired reflux ratio of from 1:1 to 10:1, especially 2:1 to 4:1 is maintained at all times.
- distillate receiver 56 From the distillate receiver 56 methanol is fed back to the decoloriser 2 and third crop purification column using a distillate transfer pump 57.
- the distillate receiver 56 also has a make-up facility to add virgin methanol 59.
- Vent lines from the condenser 50, the reflux pot 52, the bottoms holding tank 41 and the distillate receiver 56 are all part of a common venting system which passes through a vent condenser prior to venting to atmosphere through a flame arrestor and conservation vent.
- the vent condenser uses process refrigeratedwater to condense any remainingvapours in the system to minimise emissions.
- a mixture of waste methanol from the regeneration of the Ioversol decolorisation and 3rd crop recoverychromatographic separation columns was collected in a 23,000 It carbon steel collection tank.
- the coloured waste solvent contains ca 80% v/v methanol, with approximately 15% v/v water and 3- 5% w/w nonionic organic compounds, as impurities.
- This waste solvent stream was fed to a continuous distillation column, containing the equivalent of approximately 10 theoretical separation stages at a rate of ca 500 It/hour.
- the feed stream was fed to the mid-point of the column, initially collecting in a sump at the bottom of the column, from where it was pumped, under forced recirculation, through a steam heated reboiler, to raise the temperature of the stream to it's boiling point.
- the distillation column served to separate the methanol solvent from it's impurities by fractional distillation.
- the methanol was distilled overhead and condensed in a stainless steel heat exchanger fed by plant cooling water at ca 20-25 Deg C.
- the distillate from this condenser containing less than 2% water, was then passed through an in-line UV analyser to monitor for iodinated compounds (impurities in the recovered solvent stream) .
- This distillate stream was then collected in a reflux pot, with part of the stream pumped back to the top of the fractionation column as reflux, to improve the efficiency of component separation in the column.
- the hold tank provides 'buffer' capacity to enable the distillation column to operate continuously, independent of other process operations.
- This recovery operation allows recovery of ca 95% of the waste methanol collected from the regeneration of the decoloriser and 3rd crop chromatographic packing materials as described in WO 91/12868 and significantly reduces the volume of fresh methanol required to support plant operations on a factory scale, while, advantageously, minimising the loading for waste water treatment.
- the process of the invention is applicable not only to Ioversol but also to the general decolorisation and separation of nonionic compound impurities from water- soluble, nonionic contrast media compounds in general, or MRI agents. Examples of such compounds and agents are given in WO 91/12868A.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9811571A GB2321860A (en) | 1995-12-01 | 1996-12-02 | Reversed phase chromatographic process |
AU77071/96A AU7707196A (en) | 1995-12-01 | 1996-12-02 | Reversed phase chromatographic process |
EP96940099A EP0873169A1 (en) | 1995-12-01 | 1996-12-02 | Reversed phase chromatographic process |
NO982450A NO982450L (en) | 1995-12-01 | 1998-05-28 | Opposite phase chromatographic process |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IE950905 | 1995-12-01 | ||
IE950905 | 1995-12-01 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997020610A1 true WO1997020610A1 (en) | 1997-06-12 |
Family
ID=11040979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IE1996/000077 WO1997020610A1 (en) | 1995-12-01 | 1996-12-02 | Reversed phase chromatographic process |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0873169A1 (en) |
AU (1) | AU7707196A (en) |
GB (1) | GB2321860A (en) |
NO (1) | NO982450L (en) |
WO (1) | WO1997020610A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997046299A1 (en) * | 1996-06-05 | 1997-12-11 | Mallinckrodt Medical Imaging-Ireland | Reversed phase chromatographic process |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113413638A (en) * | 2021-05-31 | 2021-09-21 | 青岛科技大学 | A chromatography purification column for azithromycin production is with methyl alcohol purification |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991012868A1 (en) * | 1990-02-26 | 1991-09-05 | Mallinckrodt, Inc. | Reversed phase chromatographic process |
-
1996
- 1996-12-02 AU AU77071/96A patent/AU7707196A/en not_active Abandoned
- 1996-12-02 GB GB9811571A patent/GB2321860A/en not_active Withdrawn
- 1996-12-02 EP EP96940099A patent/EP0873169A1/en not_active Withdrawn
- 1996-12-02 WO PCT/IE1996/000077 patent/WO1997020610A1/en not_active Application Discontinuation
-
1998
- 1998-05-28 NO NO982450A patent/NO982450L/en unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1991012868A1 (en) * | 1990-02-26 | 1991-09-05 | Mallinckrodt, Inc. | Reversed phase chromatographic process |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997046299A1 (en) * | 1996-06-05 | 1997-12-11 | Mallinckrodt Medical Imaging-Ireland | Reversed phase chromatographic process |
GB2328385A (en) * | 1996-06-05 | 1999-02-24 | Mallinckrodt Med Imaging Ie | Reversed phase chromatographic process |
GB2328385B (en) * | 1996-06-05 | 2000-10-25 | Mallinckrodt Med Imaging Ie | Reversed phase chromatographic process |
Also Published As
Publication number | Publication date |
---|---|
GB2321860A (en) | 1998-08-12 |
EP0873169A1 (en) | 1998-10-28 |
GB9811571D0 (en) | 1998-07-29 |
NO982450L (en) | 1998-07-29 |
AU7707196A (en) | 1997-06-27 |
NO982450D0 (en) | 1998-05-28 |
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