EP1206445A1 - Procede de fabrication de la cyanhydrine de la methyl ethyl cetone - Google Patents
Procede de fabrication de la cyanhydrine de la methyl ethyl cetoneInfo
- Publication number
- EP1206445A1 EP1206445A1 EP00958611A EP00958611A EP1206445A1 EP 1206445 A1 EP1206445 A1 EP 1206445A1 EP 00958611 A EP00958611 A EP 00958611A EP 00958611 A EP00958611 A EP 00958611A EP 1206445 A1 EP1206445 A1 EP 1206445A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- reaction
- ethyl ketone
- methyl ethyl
- carried out
- cyanohydrin
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C253/00—Preparation of carboxylic acid nitriles
Definitions
- the present invention relates to a process for the manufacture of the cyanohydrin of methyl ethyl ketone of formula:
- This cyanohydrin is a starting product for the production of azo polymerization initiators.
- the reagents are generally introduced initially into the reactor and the diethylamine is added thereto with stirring; one can also proceed by adding one reagent to the other in the presence of diethylamine. The reaction is balanced.
- the diethylamine is introduced in an amount of 10- ⁇ to 5 x 10 _J mole, in particular in an amount of 1.5 x 10- ⁇ -3 x 10 - ⁇ mole per mole of the defective reagent (hydrocyanic acid or methyl ethyl ketone).
- the defective reagent hydrocyanic acid or methyl ethyl ketone
- the reaction is carried out at atmospheric pressure, at a temperature of -20 to 40 ° C, in particular of -10 to 30 ° C, at a pH of 7 to 9, particular from 7.5 to 8.5, with an HCN / ethyl ethyl ketone molar ratio of between 0.90 and 1.10, in particular between 0.95 and 1.05, and for a period of 1 to 4 hours, especially 1 to 2 hours.
- the purification of the cyanohydrin obtained consists in neutralizing the diethylamine (for example, with sulfuric acid), in acidifying so as not to displace the balance any more, and in eliminating the HCN and the ethyl ethyl ketone (in excess or n ' unreacted) by distillation under reduced pressure, respecting the decomposition temperature of cyanohydrin.
- the crude cyanohydrin is stabilized by adding sulfuric acid to neutralize the basic catalyst and bring the pH to 2.
- the crude cyanohydrin thus stabilized is topped and stripped in air for approximately 30 minutes on a rotary evaporator under 150 mbar (the free HCN recovered is trapped in soda). The temperature is around 40 ° C to limit thermal decomposition.
- Example 1 The procedure of Example 1 is reproduced, except that 160 ppm of pure diethylamine (ie 2.2 ⁇ 10 equivalent) are used in place of the sodium hydroxide solution.
- Table 1 d total HCN assay (Deniges) (2; Karl Fischer (water from HCN or ethyl ethyl ketone reagents and especially the soda in Example 1)
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9909859 | 1999-07-29 | ||
FR9909859A FR2796939B1 (fr) | 1999-07-29 | 1999-07-29 | Procede de fabrication de la cyanhydrine de la methyl ethyl cetone |
PCT/FR2000/002136 WO2001009085A1 (fr) | 1999-07-29 | 2000-07-25 | Procede de fabrication de la cyanhydrine de la methyl ethyl cetone |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1206445A1 true EP1206445A1 (fr) | 2002-05-22 |
Family
ID=9548667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00958611A Withdrawn EP1206445A1 (fr) | 1999-07-29 | 2000-07-25 | Procede de fabrication de la cyanhydrine de la methyl ethyl cetone |
Country Status (7)
Country | Link |
---|---|
US (1) | US6743938B1 (fr) |
EP (1) | EP1206445A1 (fr) |
AU (1) | AU7007900A (fr) |
CA (1) | CA2383134A1 (fr) |
CZ (1) | CZ2002541A3 (fr) |
FR (1) | FR2796939B1 (fr) |
WO (1) | WO2001009085A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020155587A1 (en) | 2001-04-20 | 2002-10-24 | Sequenom, Inc. | System and method for testing a biological sample |
US7582790B2 (en) | 2004-11-24 | 2009-09-01 | Rohm And Haas Company | Process for chemical reactions involving cyanohydrins |
DE102006058249A1 (de) * | 2006-12-08 | 2008-06-12 | Evonik Röhm Gmbh | Verfahren zur Herstellung von Cyanhydrinen sowie deren Verwendung bei der Herstellung von Methacrylsäurealkylestern |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB416007A (en) * | 1933-03-01 | 1934-09-03 | Triplex Safety Glass Co | Improvements in or relating to the manufacture of cyanhydrins |
GB452285A (en) * | 1935-01-19 | 1936-08-19 | Triplex Safety Glass Co | Improvements in or relating to the manufacture of cyanhydrins |
US4517132A (en) * | 1983-06-29 | 1985-05-14 | Union Carbide Corporation | Process for preparation of cyanohydrins |
-
1999
- 1999-07-29 FR FR9909859A patent/FR2796939B1/fr not_active Expired - Fee Related
-
2000
- 2000-07-25 WO PCT/FR2000/002136 patent/WO2001009085A1/fr active Application Filing
- 2000-07-25 CZ CZ2002541A patent/CZ2002541A3/cs unknown
- 2000-07-25 EP EP00958611A patent/EP1206445A1/fr not_active Withdrawn
- 2000-07-25 AU AU70079/00A patent/AU7007900A/en not_active Abandoned
- 2000-07-25 US US10/049,463 patent/US6743938B1/en not_active Expired - Fee Related
- 2000-07-25 CA CA002383134A patent/CA2383134A1/fr not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO0109085A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2796939B1 (fr) | 2001-09-14 |
WO2001009085A1 (fr) | 2001-02-08 |
CZ2002541A3 (cs) | 2002-06-12 |
AU7007900A (en) | 2001-02-19 |
FR2796939A1 (fr) | 2001-02-02 |
CA2383134A1 (fr) | 2001-02-08 |
US6743938B1 (en) | 2004-06-01 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20020211 |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
D17P | Request for examination filed (deleted) |
Inventor name: YOUSSEF, AMAL Inventor name: SAFO, MARTIN Inventor name: JOSHI, GAJANAN, S. Inventor name: KULKARNI, SANJEEV Inventor name: HOFFMAN, STEPHEN, J. Inventor name: DANSO-DANQUAH, RICHMOND Inventor name: GRELLA, MELISSA |
|
R17P | Request for examination filed (corrected) |
Effective date: 20020211 |
|
17Q | First examination report despatched |
Effective date: 20030909 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: ARKEMA |
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18D | Application deemed to be withdrawn |
Effective date: 20080201 |