Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J25/00—Catalysts of the Raney type
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
  • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
  • B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
  • B01J23/78—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali- or alkaline earth metals
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J25/00—Catalysts of the Raney type
  • B01J25/02—Raney nickel
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
  • C07C209/44—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of carboxylic acids or esters thereof in presence of ammonia or amines, or by reduction of nitriles, carboxylic acid amides, imines or imino-ethers
  • C07C209/48—Preparation of compounds containing amino groups bound to a carbon skeleton by reduction of carboxylic acids or esters thereof in presence of ammonia or amines, or by reduction of nitriles, carboxylic acid amides, imines or imino-ethers by reduction of nitriles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
  • B01J37/02—Impregnation, coating or precipitation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
  • B01J37/06—Washing

Definitions

• the present invention relates to the production of primary amines by catalytic hydrogenation of nitriles.
• the hydrogenation of nitriles to amines comes due to the wide use of amines, e.g. as organic solvents, agrochemicals, pharmaceuticals, surfactants and in particular intermediate products of polyamide-6,6 are of great technical importance.
• the hydrogenation is generally carried out on Raney nickel catalysts in the liquid phase at elevated temperatures and hydrogen pressures, ammonia being present to increase the yield of the primary amine by inhibiting the formation of the secondary and tertiary amines.
• US-2 165515 describes a process for the preparation of primary amines by catalytic hydrogenation of nitriles using cobalt and cobalt promoted with barium or manganese.
• No. 3,574,754 describes a process for the preparation of primary amines by hydrogenation of nitriles with ammonia using Raney nickel catalysts.
• US 4,739,120 describes a process for hydrogenating nitriles to primary amine using a rhodium catalyst.
• the reaction is carried out in the presence of a two-phase solvent system with an aqueous phase and a water-immiscible organic phase.
• EP-A-0 547 505 describes a process for the preparation of dodecylamine by catalytic hydrogenation of lauronitrile in the presence of ammonia using a magnesium-nickel catalyst coprecipitated on a support.
• PL-51 350 a nickel catalyst was used for the hydrogenation of aliphatic nitriles and especially lauronitrile. Ammonia was present to suppress the production of secondary amine.
• JP-A-7-941 804 describes a process for the preparation of primary amines by hydrogenation of the nitrile in mixtures of lower alcohol and cyclic hydrocarbon in the presence of Raney nickel catalyst modified with alkali or alkaline earth metal hydroxides and chromium.
• JP-A-6-032 767 describes a process for the hydrogenation of nitriles to primary amine using a Raney nickel catalyst in the presence of ammonia.
• D. Djaouadi et al., Catal. Org. Reactions, 423 (1995) produced a Raney nickel catalyst doped with chromium and iron by alkaline leaching of intermetallic alloys starting from Ni oAl6o or N1 2 5AI75.
• the selective hydrogenation of valeronitrile to the corresponding primary amine was carried out in cyclohexane in a stirred autoclave.
• the improvement in the selectivity to the primary amine achieved with the doping is mainly explained by a decrease in the hydrogenation rate of the secondary imine formed as an intermediate, by which back reactions are favored.
• Alkali metal hydroxide additives have also been used to improve the selectivity in the hydrogenation of organic nitriles to amines. According to TA Johnson Proceedings of the "18 th Conference on Catalysis of Organic Reactions", ed. ME Ford, 2000, article 13 et al., The selective nitrile hydrogenation could be carried out using modified lithium nickel and cobalt sponge catalysts.
• US 5 874 625 describes a process for the catalytic hydrogenation of organic nitriles to primary amines using a slurry of Raney nickel catalyst and aqueous alkali metal hydroxide, the Raney nickel catalyst and aqueous alkali metal hydroxide being about 0.1 to about Contribute 0.3% water.
• the autoclave batch is charged with hydrogen and then heated to a final temperature of about 110 ° C.
• 5,777,166 describes a process for the hydrogenation of nitriles to amines, in which: a) a Raney nickel-type catalyst is doped with at least one additional metal element from Group IVb of the Periodic Table of the Elements, one of metallurgical Ni / Al / doping element precursor alloy and the doping element / Ni weight ratio is between 0.05 and 10%; and b) the catalyst is subjected to a nitrile in a liquid reaction medium in which the nitrile is soluble, together with at least one inorganic base from the group consisting of LiOH, NaOH, KOH, RbOH and CsOH, thereby hydrogenating the nitrile.
• WO-01/66511 discloses a process for the hydrogenation of nitriles to amines, although no modification of the hydrogenation catalyst takes place before the hydrogenation.
• Alkali metal carbonates have also been used to promote the selectivity of Raney nickel catalysts for the production of amines in the alkylation of ammonia or alkylamines with alcohols.
• FR-A-2 351 088, DE-A-2621 449, DE-A-2625 196 and DE-A-2639648 describe the preparation of tertiary amines by alkylation of secondary amines with alcohols with elimination of water in the liquid phase in the presence of a Hydrogenation-dehydrogenation catalyst such as Raney nickel or Raney cobalt and one or more basic alkali metal or alkaline earth metal compounds are described.
• DE-A-2645 712 describes a process for the preparation of secondary amines by alkylation of ammonia with alcohols in the presence of a hydrogenation / dehydrogenation catalyst and a basic alkali metal or alkaline earth metal compound.
• a dephlegmator reactor was charged with ammonia, stearyl alcohol, Raney nickel and Na 2 CC> 3 at 90-140 ° C. with continuous removal of H 2 0 at atmospheric pressure, which gave> 95% distearylamine.
• a supported nickel and alkali carbonate catalyst system was used to prepare asymmetric aliphatic secondary alkyl amines.
• US Pat. No. 5,254,736 and EP-A-0 526 318 describe a process for the preparation of secondary methylalkylamines of the general formula R-NH-CH3, in which R represents an aliphatic C ⁇ o-C 2 2 chain, by amination reaction between an alcohol and a monoalkylamine.
• the amination reaction was carried out using a nickel supported catalyst in the presence of an alkali carbonate, preferably potassium carbonate, with a potassium carbonate / nickel catalyst weight ratio between 1: 4 and 1: 1 a hydrogen pressure between 10 and 50 bar.
• Disadvantages (ii) and (iii) also relate to the process for the preparation of secondary amine from an alcohol and a primary amine over a supported nickel catalyst and in the presence of a large amount of alkali metal carbonate added to the reaction mixture (US Pat. No. 5,254,736 and EP-0 526 318).
• This invention was based on the object with the above-described processes for the preparation of primary amines by catalytic hydrogenation of To overcome nitrile-related disadvantages.
• the task is therefore to suppress the formation of secondary and tertiary amine in the hydrogenation of nitriles to primary amines.
• the invention further aims to dispense with ammonia or to keep its partial pressure as low as possible during the nitrile hydrogenation.
• alkali metal carbonate or hydrogen carbonate in particular K 2 CO3
• K 2 CO3 alkali metal carbonate or hydrogen carbonate
• the modification of the hydrogenation catalyst with the alkali metal carbonate or bicarbonate such as K 2 CO3 or KHCO3 can be carried out in a slurry using distilled water as a solvent.
• the present invention thus relates to a process for the preparation of a primary amine by hydrogenation of nitriles, in which a reaction mixture which
• Another object of the invention is a modified cobalt or nickel catalyst, obtainable by adsorbing an alkali metal carbonate or alkali metal bicarbonate onto a conventional cobalt or nickel catalyst.
• Raney nickel catalysts are particularly preferred.
• the catalyst is modified with alkali metal carbonate or bicarbonate. Suitable alkali metals are Na, K, Rb, Cs.
• the alkali carbonates, and in particular K CO 3 or KHCO 3, are preferred.
• the adsorption takes place from a solution of the alkali metal carbonates or bicarbonates with concentrations of preferably 10 g / l to 400 g / l. Adsorption from aqueous solution, in particular aqueous solution with concentrations of 50 to 200 g / l, is preferred.
• ex situ means that the catalyst was modified outside, in particular before, the hydrogenation reaction from the nitrile to the amine, which is catalyzed by it.
• the weight ratio of dry catalyst to the solution of alkali metal carbonate or hydrogen carbonate is preferably 50 to 350 g / l.
• the untreated catalyst is preferably cobalt, nickel, Raney cobalt or Raney nickel.
• the catalysts can be used with or without promoters. Promoters are, for example, Fe, Mo, Cr, Ti, Zr.
• the catalysts can be applied to support materials. Such carrier materials are for example SiC> 2, Al2O3, ZrO2, MgO, MnO, ZnO, Cr 2 O3.
• the untreated catalyst is preferably slurried in the solution of alkali metal carbonate or hydrogen carbonate and under hydrogen or an inert gas such as e.g. Nitrogen stirred for about 1 to 16 hours.
• the excess of the solution is filtered after filtering under Inert gas, preferably nitrogen atmosphere removed. It is advantageous to wash the catalyst obtained after the adsorption with alcohol and then with a hydrocarbon.
• the modified catalyst is obtained from the slurry by decanting and then washing the catalyst three times with ethanol and washing twice with cyclohexane.
• the alkali metal carbonate or bicarbonate is in the modified
• the modified catalyst preferably before in an amount of about 2 to 12 wt .-%.
• the modified catalyst contains K 2 CO3 or KHCO3 in an amount of about 6 to 7% by weight.
• the process according to the invention is suitable for the hydrogenation of any nitriles.
• They are preferably nitriles of the formula R-CN, where R represents a saturated or unsaturated hydrocarbon group of 1 to 32, preferably 4 to 24, in particular 8 to 22 carbon atoms.
• R furthermore preferably represents an alkyl group, in particular a linear alkyl group.
• the modified catalyst is generally present in the reaction mixture in an amount of about 1 to 10% by weight, based on the nitrile.
• the reaction mixture can also contain a solvent.
• Short-chain alcohols in particular methanol, ethanol and propanol, and hydrocarbons such as hexane, cyclohexane and toluene are preferably suitable for this.
• the solvent can be present in the mixture in amounts of about 0 to 90% by weight, based on the reaction mixture.
• the amount of ammonia in the reaction mixture should be 1 to 10% by weight, based on the nitrile.
• the nitrile hydrogenation on the modified catalyst is preferably carried out under a hydrogen pressure of 1 to 200, in particular 2 to 30 bar.
• the nitrile hydrogenation on the modified catalyst is preferably carried out in the temperature range from 60 to 250 ° C., in particular 100 to 150 ° C.
• the catalysts of Examples 1 to 14 are Raney nickel catalysts.
• Example 25 The procedure was analogous to Example 21, but with the modification that the Raney nickel catalyst had been modified with 200 g / l K CO 3 solution according to Example 3. After a reaction time of 2 hours, the dodecylamine yield was 91.0% with a conversion of 93.0%.
• Example 25 The procedure was analogous to Example 21, but with the modification that the Raney nickel catalyst had been modified with 200 g / l K CO 3 solution according to Example 3. After a reaction time of 2 hours, the dodecylamine yield was 91.0% with a conversion of 93.0%. Example 25
• Example 28 The procedure was analogous to Example 21, but with the modification that the Raney nickel catalyst had been modified with 150 g / l K 2 CO 3 solution according to Example 7. After a reaction time of 2 hours, the dodecylamine yield was 96.1% with a conversion of 99.5%.
• Example 34 The procedure was analogous to Example 21, but with the modification that the Raney nickel catalyst had been modified with 150 g / l Rb 2 CO 3 solution according to Example 13. After a reaction time of 2 hours, the dodecylamine yield was 96.3% with a conversion of 99.7%.
• Example 38 100 ml of oleic acid nitrile, 1 g of cobalt catalyst modified with 150 g / l of K 2 CO 3 solution on diatomaceous earth (Example 17) and 3 g (0.12 mol) of ammonia were placed in the reactor. The reaction was carried out under hydrogen pressure of 60 bar at 140 ° C. for 4 hours, the reaction mixture being stirred at 1500 rpm. The yield of primary amines (oleylamine) was 99.6% with a conversion of 99.8%.
• Table 4 Hydrogenation of lauronitrile with unmodified catalyst with addition of ammonia (example 42)
• Table 5 Hydrogenation of lauronitrile with a modified catalyst without the addition of ammonia (Example 43)

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• 2002
  • 2002-02-23 DE DE10207926A patent/DE10207926A1/de not_active Withdrawn
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