EP1206445A1 - Method for making methyl ethyl ketone cyanohydrin - Google Patents

Method for making methyl ethyl ketone cyanohydrin

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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.)
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Application number
EP00958611A
Other languages
German (de)
French (fr)
Inventor
Jean-François Croizy
Marc Esch
Gilbert Esquirol
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arkema France SA
Original Assignee
Atofina SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Atofina SA filed Critical Atofina SA
Publication of EP1206445A1 publication Critical patent/EP1206445A1/en
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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

The invention concerns a method for making ketone methyl ethyl cyanohydrin of formula (I) characterised in that it consists in reacting hydrocyanic acid and ketone methyl ethyl in the presence of diethylamine as catalyst.

Description

PROCEDE DE FABRICATION DE LA CYANHYDRINE DE LA METHYL ÉTHYL CÉTONEPROCESS FOR THE MANUFACTURE OF METHYL ETHYL KETONE CYANHYDRIN
La présente invention porte sur un procédé de fabrication de la cyanhydrine de la methyl éthyl cétone de formule :The present invention relates to a process for the manufacture of the cyanohydrin of methyl ethyl ketone of formula:
CNCN
!!
CH3 - C - CH2CH3 . OHCH 3 - C - CH 2 CH 3 . OH
Cette cyanhydrine est un produit de départ pour la fabrication d'amorceurs de polymérisation azoïques.This cyanohydrin is a starting product for the production of azo polymerization initiators.
A la connaissance de la Société déposante, la préparation de la cyanhydrine de la methyl éthyl cétone est très peu décrite de manière spécifique dans la littérature. On peut simplement citer l'Exemple III de la demande internationale WO 85/00166 qui décrit la préparation de cette cyanhydrine par réaction de la methyl éthyl cétone avec le cyanure de sodium et l'acide chlorhydrique dans l'eau. Les inconvénients de cette méthode sont la présence d'eau et de sel en quantités stoechio étriques .To the knowledge of the Applicant Company, the preparation of methyl ethyl ketone cyanohydrin is very little specifically described in the literature. We can simply cite Example III of international application WO 85/00166 which describes the preparation of this cyanohydrin by reaction of methyl ethyl ketone with sodium cyanide and hydrochloric acid in water. The disadvantages of this method are the presence of water and salt in stoechio metric quantities.
Conformément à la présente invention, il est proposé un procédé pour obtenir la cyanhydrine en question, avec une cinétique rapide, ce procédé étant caractérisé par le fait que l'on fait réagir l'acide cyanhydrique et la methyl éthyl cétone en présence de diéthylamine comme catalyseur.In accordance with the present invention, there is provided a process for obtaining the cyanhydrin in question, with rapid kinetics, this process being characterized by the fact that hydrocyanic acid and methyl ethyl ketone are reacted in the presence of diethylamine as catalyst.
Si l'on compare avec la même réaction conduite avec emploi d'une solution de soude comme catalyseur, on constate comme premier avantage une accélération de la vitesse de réaction. Le second avantage que l'on peut mentionner est que, compte tenu de la meilleure activité de la diéthylamine par rapport à la soude, on peut en utiliser moins, ce qui permet de limiter l'apport ultérieur d'acide sulfurique nécessaire pour neutraliser le catalyseur avant purification de la cyanhydrine (avec la soude, le risque de cristallisation du sel Na2S0 est réel et nécessite éventuellement une filtration, ce qui n'est pas le cas avec une faible quantité d'aminé). On peut également souligner qu'il n'est pas nécessaire de travailler en présence de traces d'eau apportées par la soude, ce qui évite d' éventuelles démixtions et limite la teneur en eau et en produits d'hydrolyse dans la cyanhydrine pure (acide formique) .If we compare with the same reaction carried out with the use of a sodium hydroxide solution as catalyst, we note as an initial advantage an acceleration of the reaction speed. The second advantage that can be mentioned is that, given the better activity of diethylamine compared to sodium hydroxide, less can be used, which limits the subsequent supply of sulfuric acid necessary to neutralize the catalyst before purification of cyanhydrin (with soda, the risk of crystallization of the Na 2 S0 salt is real and requires possibly filtration, which is not the case with a small amount of amine). It can also be emphasized that it is not necessary to work in the presence of traces of water provided by the soda, which avoids possible demixing and limits the content of water and of hydrolysis products in pure cyanohydrin ( formic acid).
Les réactifs sont généralement introduits initialement dans le réacteur et on vient y ajouter la diéthylamine sous agitation ; on peut également procéder en ajoutant un réactif dans l'autre en présence de diéthylamine. La réaction est équilibrée.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.
De préférence, on introduit la diéthylamine à raison de 10-^ à 5 x 10_J mole, en particulier à raison de 1,5 x 10-^ -3 x ÎO--^ mole par mole du réactif en défaut (acide cyanhydrique ou methyl éthyl cétone) .Preferably, 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).
Conformément à d'autres caractéristiques de la présente invention, on conduit la réaction à la pression atmosphérique, à une température de -20 à 40°C, en particulier de -10 à 30°C, à un pH de 7 à 9, en particulier de 7,5 à 8,5, avec un rapport molaire HCN / ethyl éthyl cétone compris entre 0,90 et 1,10, en particulier entre 0,95 et 1,05, et pendant une durée de 1 à 4 heures, en particulier de 1 à 2 heures. La purification de la cyanhydrine obtenue consiste à neutraliser la diéthylamine (par exemple, avec de l' acide sulfurique), à acidifier pour ne plus déplacer l'équilibre, et à éliminer l'HCN et la ethyl éthyl cétone (en excès ou n'ayant pas réagi) par distillation sous pression réduite, en respectant la température de décomposition de la cyanhydrine .In accordance with other characteristics of the present invention, 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.
Les Exemples suivants illustrent la présente invention sans toutefois en limiter la portée. EXEMPLE 1 (comparatif) :The following Examples illustrate the present invention without, however, limiting its scope. EXAMPLE 1 (comparative):
Préparation de la cyanhydrine de la methyl éthyl cétone avec NaOH comme catalyseurPreparation of methyl ethyl ketone cyanohydrin with NaOH as catalyst
Dans un réacteur à double enveloppe de 500 cm , préalablement refroidi à environ 0°C, on introduit environ 5 moles d'HCN pur à plus de 99% (environ 200 ml), puis la quantité équimolaire de ethyl éthyl cétone pure à plus de 99% (environ 400 ml) préalablement refroidie. Le mélange est agité mécaniquement, maintenu à environ 0°C, puis on ajoute environ 500 ppm (soit 1,2 x 10~2 équivalent) de NaOH sous la forme d'une solution aqueuse de soude à 300 g/1. On a dû utiliser jusqu'à 5 fois plus de NaOH que prévu pour démarrer et suivre la réaction du fait que la solution de soude n'est pas complètement miscible dans le mélange de départ.Into a 500 cm jacketed reactor, previously cooled to approximately 0 ° C., approximately 5 moles of pure HCN above 99% (approximately 200 ml) are introduced, then the equimolar amount of pure ethyl ethyl ketone above 99% (about 400 ml) previously cooled. The mixture is mechanically stirred, maintained at approximately 0 ° C., then approximately 500 ppm (or 1.2 × 10 −2 equivalent) of NaOH are added in the form of an aqueous sodium hydroxide solution at 300 g / l. It was necessary to use up to 5 times more NaOH than intended to start and follow the reaction because the sodium hydroxide solution is not completely miscible in the starting mixture.
L' avancement de la réaction en fonction du temps est suivi par des prises d'échantillons (environ 1 à 2 ml) et dosage de l'HCN n'ayant pas réagi. A l'équilibre, la conversion de l'HCN est de 94,5-95%.The progress of the reaction as a function of time is followed by taking samples (approximately 1 to 2 ml) and assaying the unreacted HCN. At equilibrium, the conversion of HCN is 94.5-95%.
En fin de réaction, la cyanhydrine brute est stabilisée par ajout d'acide sulfurique pour neutraliser le catalyseur basique et ramener le pH vers 2.At the end of the reaction, the crude cyanohydrin is stabilized by adding sulfuric acid to neutralize the basic catalyst and bring the pH to 2.
La cyanhydrine brute ainsi stabilisée est étêtée et strippée à l'air pendant environ 30 minutes sur évaporateur rotatif sous 150 mbar (l'HCN libre récupéré est piégé dans la soude). La température est d'environ 40°C pour limiter la décomposition thermique.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.
On obtient ainsi 880 g de cyanhydrine de la methyl éthyl cétone.880 g of cyanohydrin from methyl ethyl ketone are thus obtained.
Les analyses et puretés obtenues sont rapportées dans le Tableau 1. EXEMPLE 2 (de l'invention) :The analyzes and purities obtained are reported in Table 1. EXAMPLE 2 (of the invention):
On reproduit le mode opératoire de l'Exemple 1, excepté que l'on utilise 160 ppm de diéthylamine pure (soit 2,2 x 10 équivalent) à la place de la solution de soude.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.
On obtient ainsi 950 g de la cyanhydrine de la ethyl éthyl cétone.950 g of the cyanohydrin of ethyl ethyl ketone are thus obtained.
Les analyses et puretés obtenues sont également indiquées dans le Tableau 1.The analyzes and purities obtained are also indicated in Table 1.
Tableau 1 d : dosage HCN total (Deniges) (2; Karl Fischer (eau provenant des réactifs HCN ou ethyl éthyl cétone et surtout de la soude à l'Exemple 1)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)
(3; dosage Charpentier-Volhard ( : complément à 100% (s: acidimétrie (3; Charpentier-Volhard assay (: 100% complement (s: acidimetry

Claims

REVENDICATIONS
1 - Procédé de fabrication de la cyanhydrine de la ethyl éthyl cétone de formule :1 - Process for the manufacture of cyanohydrin of ethyl ethyl ketone of formula:
CN ICN I
CH3 - C - CH2CH3 CH 3 - C - CH 2 CH 3
OH caractérisé par le fait que l'on fait réagir l'acide cyanhydrique et la methyl éthyl cétone en présence de diéthylamine comme catalyseur.OH characterized by the fact that hydrocyanic acid and methyl ethyl ketone are reacted in the presence of diethylamine as catalyst.
2 - Procédé selon la revendication 1, caractérisé par le fait que l'on introduit la diéthylamine à raison de I x l0 j à 5 x l0 mole par mole du réactif en défaut. 3 - Procédé selon la revendication 2, caractérisé par le fait que l'on introduit la diéthylamine à raison de 1, 5 x 10 à 3 x 10 mole par mole du réactif en défaut.2 - Process according to claim 1, characterized in that the diethylamine is introduced in an amount of I x 10 d to 5 x 10 mole per mole of the defective reagent. 3 - Process according to claim 2, characterized in that the diethylamine is introduced in an amount of 1.5 x 10 to 3 x 10 mole per mole of the defective reagent.
4 - Procédé selon l'une des revendications 1 à 3, caractérisé par le fait que l'on conduit la réaction à la pression atmosphérique.4 - Method according to one of claims 1 to 3, characterized in that the reaction is carried out at atmospheric pressure.
5 - Procédé selon l'une des revendications 1 à 4, caractérisé par le fait que l'on conduit la réaction à une température de -20 à 40°C.5 - Method according to one of claims 1 to 4, characterized in that the reaction is carried out at a temperature of -20 to 40 ° C.
6 - Procédé selon la revendication 5, caractérisé par le fait que l'on conduit la réaction à une température de -10 à 30°C.6 - Process according to claim 5, characterized in that the reaction is carried out at a temperature of -10 to 30 ° C.
7 - Procédé selon l'une des revendications 1 à 6, caractérisé par le fait que l'on conduit la réaction à un pH de 7 à 9. 8 - Procédé selon la revendication 7, caractérisé par le fait que l'on conduit la réaction à un pH de 7,5 à7 - Method according to one of claims 1 to 6, characterized in that the reaction is carried out at a pH of 7 to 9. 8 - Method according to claim 7, characterized in that the reaction is carried out reaction at pH 7.5 to
8,5.8.5.
9 - Procédé selon l'une des revendications 1 à 8, caractérisé par le fait que l'on conduit la réaction avec un rapport molaire HCN / methyl éthyl cétone compris entre 0,90 et 1,10, en particulier compris entre 0,95 et 1,05. 10 - Procédé selon l'une des revendications 1 à 9, caractérisé par le fait que l'on conduit la réaction pendant une durée de 1 à 4 heures, en particulier de 1 à 2 heures. 9 - Method according to one of claims 1 to 8, characterized in that the reaction is carried out with a molar ratio HCN / methyl ethyl ketone between 0.90 and 1.10, in particular between 0.95 and 1.05. 10 - Method according to one of claims 1 to 9, characterized in that the reaction is carried out for a period of 1 to 4 hours, in particular from 1 to 2 hours.
EP00958611A 1999-07-29 2000-07-25 Method for making methyl ethyl ketone cyanohydrin Withdrawn EP1206445A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9909859 1999-07-29
FR9909859A FR2796939B1 (en) 1999-07-29 1999-07-29 PROCESS FOR PRODUCING METHYL ETHYL CETONE CYANHYDRIN
PCT/FR2000/002136 WO2001009085A1 (en) 1999-07-29 2000-07-25 Method for making methyl ethyl ketone cyanohydrin

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EP1206445A1 true EP1206445A1 (en) 2002-05-22

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Country Status (7)

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US (1) US6743938B1 (en)
EP (1) EP1206445A1 (en)
AU (1) AU7007900A (en)
CA (1) CA2383134A1 (en)
CZ (1) CZ2002541A3 (en)
FR (1) FR2796939B1 (en)
WO (1) WO2001009085A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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 (en) * 2006-12-08 2008-06-12 Evonik Röhm Gmbh Process for the preparation of cyanohydrins and their use in the preparation of methacrylic acid alkyl esters

Family Cites Families (3)

* Cited by examiner, † Cited by third party
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0109085A1 *

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Publication number Publication date
FR2796939B1 (en) 2001-09-14
WO2001009085A1 (en) 2001-02-08
CZ2002541A3 (en) 2002-06-12
AU7007900A (en) 2001-02-19
FR2796939A1 (en) 2001-02-02
CA2383134A1 (en) 2001-02-08
US6743938B1 (en) 2004-06-01

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