GB2322812A - Solvent purification - Google Patents
Solvent purification Download PDFInfo
- Publication number
- GB2322812A GB2322812A GB9704815A GB9704815A GB2322812A GB 2322812 A GB2322812 A GB 2322812A GB 9704815 A GB9704815 A GB 9704815A GB 9704815 A GB9704815 A GB 9704815A GB 2322812 A GB2322812 A GB 2322812A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solvent
- receiver
- purified
- containing impurities
- purification process
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/34—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping with one or more auxiliary substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
- B01D3/322—Reboiler specifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
- B01D3/4205—Reflux ratio control splitter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
- B01D5/0063—Reflux condensation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
- C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/88—Separation; Purification; Use of additives, e.g. for stabilisation by treatment giving rise to a chemical modification of at least one compound
Abstract
A purification process for purifying a solvent, especially methanol comprises introducing feedstock solvent into a boiling vessel. The feedstock is refluxed for a period of at least 5 minutes, distilling the methanol and delivering the purified solvent into a first purified solvent receiver. Further feedstock is drip fed into the boiling vessel. The delivery of purified solvent is directed to a second receiver while the purified solvent in the first receiver is bottled. Sodium borohydride is added to the boiling vessel in an amount of approximately 0.025% by weight of the methanol.
Description
"Solvent Purification"
The invention relates to solvent purification, in particular to a process for purifying all alcohol, especially Methanol containing impurities such as Acetone,
Methyl Ethyl Ketone, Water, Formic Acid, Formaldehyde,
Acetic Acid and Methyl Esters and the like.
Methanol is widely used in selective recrystallisation and extractive distillation. Because of its favourable dielectric, solvent, and optical properties it is also widely used in analytical chemistry, particularly in high performance liquid chromatography (hplc), organic synthesis, pesticide residue analysis, UV and IR spectroscopy, purge and trap analysis, and DNA and peptide synthesis.
As analytical chemistry techniques and analytical machines become ever more sophisticated there is a need to develop processes for producing Methanol to a very high level of purity for use as a standard in such equipment.
This invention is therefore directed towards providing a process for producing Methanol having a very high level of purity in a cost efficient manner.
According to the invention there is provided a purification process for purifying solvent containing impurities to produce purified solvent, the process comprising the steps of:
introducing feedstock solvent containing impurities
into a boiling vessel;
refluxing the feedstock solvent in the boiling vessel
for a period of at least 5 minutes;
distilling the solvent by passing the solvent through
a distillation column;
delivering the purified solvent thus produced into a
first purified solvent receiver;
drip feeding further feedstock solvent containing
impurities into the boiling vessel;
closing off delivery of purified solvent to the first
receiver;
opening delivery of the purified solvent to a second
receiver;
bottling purified solvent from the first receiver while
purified solvent is delivered to the second receiver;
on completion of bottling from the first receiver and
filling of the second receiver closing off delivery to
the second receiver and re-opening delivery to the
first receiver; and
bottling purified solvent from the second receiver
while delivery of purified solvent from the
distillation column to the first receiver is continued.
Preferably the solvent purification process includes the step of adding a reducing agent, preferably sodium borohydride, to the solvent in the boiling vessel, and producing a first residue containing impurities and reducing agent.
In a particularly preferred embodiment of the invention the process includes the steps of:
adding further feedstock solvent containing impurities
to the boiling vessel;
adding further reducing agent to the mixture;
distilling the mixture;
recovering purified solvent; and
producing a second residue containing impurities and
reducing agent.
Preferably the process includes the steps of:
adding further feedstock solvent containing impurities
to the second residue;
adding further reducing agent to the mixture;
distilling the mixture;
recovering purified solvent;
producing a third residue containing impurities and
reducing agent; and
removing the third residue.
In a preferred embodiment of the invention the sodium borohydride is added in an amount of from 0.0125% to 0.0375% by weight of the solvent containing impurities.
Preferably the solvent is an alcohol, especially methanol.
The invention also provides purified solvent whenever purified by the process of the invention.
The invention will be more clearly understood from the following description thereof given by way of example only with reference to the accompanying drawing which is a schematic diagram of a customer designed distillation apparatus used in the process of the invention.
Referring to the drawing, there is illustrated a distillation apparatus used in the process of the invention comprising a distillation column 1 of packed raschig rings having from 30 to 40 theoretical plates.
Feed solvent from a raw material vessel 20 is added into a boiling vessel 2 through an inlet value 3. The feed material is heated by passing through a reboiler 5 having a steam heated coil 6. Vapour from the distillation column 1 is condensed by passing cooing water through a coil 7 in a condenser 8. Reflux material is returned to the column 1 through a reflux line 9. When the desired purity level has been reached the material is fed through an outlet line 10 to a first collection vessel 12, on opening a first delivery valve 13 and closing a second delivery valve 14. Alternatively, as explained in more detail below, on closing of the first delivery valve 13 and opening of the second delivery valve 14 the purified solvent may be directed to a second collection vessel 15.
The purified solvent is bottled using an automatic filling machine 16. The purified solvent may be passed through a secondary condenser 11 prior to delivery to the collection vessels 12, 15.
Feedstock solvent is delivered from the feedstock solvent vessel 20 in accordance with the level of solvent in the boiling vessel 2 as determined by a level controller 21 which operates a control valve 22 on the feedstock solvent feed line.
Purified solvent may be recycled from the first collection vessel 12 along a recycling line 25 on opening of a recycle valve 26.
Residue may be removed through a residue discharge line 27 on opening a residue discharge valve 28.
EXAMPLE
Feedstock methanol is introduced into the boiling vessel 2. Sodium borohydride in an amount of approximately 20g per 100 litres of solvent is added to the solvent in the boiling vessel 2. The feedstock solvent mixture is refluxed for from 15 to 30 minutes with steam. When the required purity level is achieved the purified solvent is delivered into the first receiving vessel 12. When the first vessel 12 is filled to the required level the inlet valve 13 to the first vessel 12 is closed and the inlet valve 14 to the second receiving vessel 15 is opened.
Feedstock methanol is drip-fed from the supply vessel 20 into the reboiler 5. The level of feedstock methanol is monitored at all times by the automatic level controller 21 and associated control valve 22. The optimum delivery of feedstock methanol is determined by sampling of the purified solvent delivered into the receiving vessel 15.
When the second receiving vessel 15 is almost full the distilled solvent is switched back to the first receiving vessel 12 by closing the valve 14 and opening valve 13.
Purified solvent from the second receiving vessel 15 is bottled. Distillation is continued to the first receiving vessel 12 while purified solvent from the second receiving vessel 15 is bottled. When the first receiving vessel 12 has been filled with solvent the distillation delivery is switched back to the second receiving vessel 15.
During the distillation process for methanol sodium borohydride is added to the feedstock solvent in the boiling vessel in an amount of 20g per 100 litres of methanol. A first residue containing impurities and sodium borohydride is produced. Further feedstock methanol containing impurities is introduced into the boiling vessel and additional sodium borohydride in an amount of approximately 15g per 100 litres of methanol is added. The process produces a second residue containing impurities and sodium borohydride. Further feedstock methanol containing impurities is introduced into the boiling vessel and additional sodium borohydride in an amount of approximately lOg per 100 litres of methanol is added. The process produces a third residue which may be removed or a further amount of feedstock methanol and lOg of sodium borohydride per 100 ml of solvent may be added.
In this way very high purity levels can be achieved while operating the process to maximise production of purified solvent with minimum downtime required for cleaning out impurity residue products.
The continuous distillation process of the invention offers considerable manufacturing advantages as there are substantial reductions in down-time required for cleaning, bottling and re-charging. In addition, the amount of treatment chemicals required is optimised. The process removes substantially all impurities, including halogenated, aromatic and carbonyl compounds and a ultra pure high quality solvent is produced which is suitable for a very wide range of applications.
The high grade purified Methanol is used in HPLC analysis and has a wide range of application including applications in organic synthesis and in residue analyses, purge and trap analysis and IV-IR Spectroscopy.
The invention is not limited to the embodiments hereinbefore described which may be varied in detail.
Claims (11)
1. A solvent purification process for purifying
solvent containing impurities to produce purified
solvent, the process comprising the steps of:
introducing feedstock solvent containing
impurities into a boiling vessel;
ref fluxing the feedstock solvent in the
boiling vessel for a period of at least 5
minutes;
distilling the solvent by passing the solvent
through a distillation column;
delivering the purified solvent thus produced
into a first purified solvent receiver;
drip feeding further feedstock solvent
containing impurities into the boiling
vessel;
closing off delivery of purified solvent to
the first receiver;
opening delivery of the purified solvent to
a second receiver;
bottling purified solvent from the first
receiver while purified solvent is delivered
to the second receiver;
on completion of bottling from the first
receiver and filling of the second receiver
closing off delivery to the second receiver
and re-opening delivery to the first
receiver; and
bottling purified solvent from the second
receiver while delivery of purified solvent
from the distillation column to the first
receiver is continued.
2. A solvent purification process as claimed in claim
1 including the step of adding a reducing agent to
the solvent in the boiling vessel and producing a
first residue containing impurities and reducing
agent.
3. A solvent purification process as claimed in claim
2 including the steps of:
adding further feedstock solvent containing
impurities to the boiling vessel;
adding further reducing agent to the mixture;
distilling the mixture;
recovering purified solvent; and
producing a second residue containing
impurities and reducing agent.
4. A solvent purification process as claimed in claim
3 including the steps of:
adding further feedstock solvent containing
impurities to the second residue;
adding further reducing agent to the mixture;
distilling the mixture;
recovering purified solvent;
producing a third residue containing
impurities and reducing agent; and
removing the third residue.
5. A solvent purification process as claimed in an of
claims 2 to 4 wherein the reducing agent is sodium
borohydride.
6. A solvent purification process as claimed in claim
5 wherein the sodium borohydride is added in an
amount of from 0.0125% to 0.0375% by weight of the
solvent containing impurities.
7. A solvent purification process as claimed in claim
6 wherein the sodium borohydride is added in an
amount of approximately 0.025% by weight of the
solvent containing impurities.
8. A solvent purification process as claimed in any
preceding claim wherein the solvent is an alcohol.
9. A solvent purification process as claimed in claim
8 wherein the solvent is methanol.
10. A solvent purification process substantially as
hereinbefore described with reference to the
drawing and example.
11. Solvent whenever purified by a process as claimed
in any preceding claim.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IES970144 IES73195B2 (en) | 1997-03-03 | 1997-03-03 | Solvent purification |
GB9704815A GB2322812B (en) | 1997-03-03 | 1997-03-07 | Solvent purification |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IES970144 IES73195B2 (en) | 1997-03-03 | 1997-03-03 | Solvent purification |
GB9704815A GB2322812B (en) | 1997-03-03 | 1997-03-07 | Solvent purification |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9704815D0 GB9704815D0 (en) | 1997-04-23 |
GB2322812A true GB2322812A (en) | 1998-09-09 |
GB2322812B GB2322812B (en) | 2001-03-14 |
Family
ID=26311142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9704815A Expired - Fee Related GB2322812B (en) | 1997-03-03 | 1997-03-07 | Solvent purification |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2322812B (en) |
IE (1) | IES73195B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004072007A1 (en) * | 2003-02-06 | 2004-08-26 | Honeywell International Inc. | Purification of alcohol |
CN106397127A (en) * | 2016-08-30 | 2017-02-15 | 蚌埠丰原医药科技发展有限公司 | Preparation method of chromatographic pure methanol for scientific research by using industrial grade methanol |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB912797A (en) * | 1960-04-22 | 1962-12-12 | Union Carbide Corp | Improvements in and relating to a process for refining alcohols |
GB2290291A (en) * | 1994-06-07 | 1995-12-20 | G K Analytical Sciences Limite | Methanol purification |
-
1997
- 1997-03-03 IE IES970144 patent/IES73195B2/en not_active IP Right Cessation
- 1997-03-07 GB GB9704815A patent/GB2322812B/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB912797A (en) * | 1960-04-22 | 1962-12-12 | Union Carbide Corp | Improvements in and relating to a process for refining alcohols |
GB2290291A (en) * | 1994-06-07 | 1995-12-20 | G K Analytical Sciences Limite | Methanol purification |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004072007A1 (en) * | 2003-02-06 | 2004-08-26 | Honeywell International Inc. | Purification of alcohol |
CN106397127A (en) * | 2016-08-30 | 2017-02-15 | 蚌埠丰原医药科技发展有限公司 | Preparation method of chromatographic pure methanol for scientific research by using industrial grade methanol |
Also Published As
Publication number | Publication date |
---|---|
IES73195B2 (en) | 1997-05-07 |
GB2322812B (en) | 2001-03-14 |
GB9704815D0 (en) | 1997-04-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20120307 |