DE1467193C3 - Process for the preparation of hydrazines - Google Patents

Description

R ¹

R ²

N -R ³

NR ⁴

R ¹

NH

NH

in which R ¹ , R ² , R ³ and R ^{4 can have the} same or different meanings and represent hydrogen, alkyl radicals, substituted alkyl radicals, aryl radicals or substituted aryl radicals, or R ¹ and R ² together form a polymethylene chain.

3. The method according to claim 1, characterized in that the carbonyl derivative of hydrazine Acetone ketazine or methylethylketonazine is used.

4. The method according to claim 1, characterized in that the carbonyl derivative of hydrazine Acetone hydrazone or methyl ethyl ketone hydrazone is used.

5. The method according to claim 1 to 4, characterized in that a cation exchanger is used which contains sulfonic, phosphonic or phosphinic acid groups.

6. The method according to claim 5, characterized in that a cation exchanger is used which is a styrene-divinylbenzene copolymer or an acrylate-divinylbenzene copolymer contains.

7. The method according to claim 5, characterized in that a sulfonated, polystyrene resin crosslinked with a divinylbenzene copolymer is used.

8. The method according to claim 1 to 7, characterized in that in the treatment of the carbonyl derivative of hydrazine or a substituted hydrazine with the cation exchanger this in finely divided form as a fluidized bed in a stream of the carbonyl derivative is maintained.

60 in which R represents hydrogen or an alkyl radical, R ^{1 represents} an alkyl or aryl radical and R and R ¹ together form a polymethylene chain; The hydrazine salts could be obtained from these isohydrazones by acid hydrolysis. The second process is the well-known Raschig synthesis, in which ammonia is reacted with sodium chloride solution (hypochlorite) to form hydrazine, which is obtained by distillation. However, the yields in the latter process are not very high and one way of obtaining higher yields of hydrazine which are easier to isolate is to use a ketone such as. B. acetone or methyl ethyl ketone is added in order to produce the corresponding azine, which can then be hydrolyzed to hydrazine salts.

The aim of the present invention is now to provide a process for the preparation of hydrazine with high yields to create that does not have the disadvantages of the above methods.

The inventive method for the preparation of hydrazine or a substituted hydrazine by hydrolysis of a carbonyl derivative of hydrazine or a substituted hydrazine is thereby characterized in that an aqueous solution of the carbonyl derivative with a cation exchanger treated in hydrogen form at a temperature greater than 40 ° C and the hydrazine or the substituted Releases hydrazine from the cation exchanger.

Treatment with the exchange resin turns the carbonyl derivative into the corresponding one Hydrazine and the carbonyl compound are hydrolyzed, with the hydrazine on the cation exchanger is held back. By subsequently treating the cation exchanger with a base the hydrazine or the substituted hydrazine is released and can then be isolated. As a carbonyl derivative an isohydrazone, a hydrazone, or an azine can also be used.

Any isohydrazone of the following formula is suitable as an isohydrazone:

R ¹

R ²

N -R ³

N -R ⁴

The present invention relates to a process for the preparation of hydrazine and substituted Hydrazines.

In this formula, R ¹ and R ^{2 can have} the same or different meanings and represent hydrogen, an alkyl radical having 1 to 4 carbon atoms, such as, for example, a methyl, ethyl, propyl or butyl radical; a substituted alkyl radical, such as. B. a chlorine

ethyl residue; an aryl radical, such as, for example, a phenyl radical; or a substituted aryl radical, or R ¹ and R ² can together form a polymethylene chain with, for. B. form 4 to 8 carbon atoms; the radicals ^{R 3} and R ⁴ can also have the same or different meanings and represent hydrogen, an alkyl radical with z. B. 1 to 4 carbon atoms, such as. B. a methyl, ethyl, propyl or butyl radical; a substituted alkyl radical, such as. B. a hydroxyethyl or hydroxypropyl radical, a cyanoethyl or acetylethyl radical; or for an aryl radical, such as. B. a phenyl radical. Methylethylketonisohydrazone is particularly suitable; other suitable isohydrazones are acetone isohydrazone, diethyl ketone isohydrazone, cyclohexane isohydrazone and N-cyclohexylacetone isohydrazone. Usable azines are e.g. B. Acetonazine, Methyläthylketonazin, Methylisobutylketonazin, Cyclohexanonazin and Propionaldazin. Examples of hydrazones are acetone hydrazone, methyl ethyl ketone hydrazone and cyclohexanone hydrazone.

In the process for the production of hydrazine, in which isohydrazones by reacting a first Ketone or an aldehyde made with chlorine or chloramine and an excess of ammonia and then hydrazine is recovered from the isohydrazone, the reaction mixture must be filtered to remove ammonium chloride and dissolved ammonia, the excess aldehyde or to distill off the ketone, to distill off the isohydrazone from the condensation by-products, hydrolyze the isohydrazone with acid and the aldehyde or ketone obtained by this hydrolysis to distill off. The free base is then added in a known manner, e.g. B. by treatment with ammonia under pressure, obtained from the hydrazine salt. It has now been found that the number of of the hydrazine required process steps are significantly reduced and the yield is increased can be, if one uses a cation exchanger in hydrogen form, to the hydrazine directly to be obtained from the isohydrazone mother liquor. According to the present invention is therefore the aqueous solution of a carbonyl derivative of hydrazine or a substituted hydrazine, the treated with a cation exchanger, the material that has been obtained by a ketone or an aldehyde with chlorine or chloramine and an excess of ammonia or one Amine converts and ammonia and ammonium chloride are removed from this mother liquor. As soon as that on the Resin retained ketone has been removed by washing and the resin has been treated with a base, an aqueous solution of hydrazine is obtained, which is the basic by-products of isohydrazone synthesis contains; the hydrazine is distilled off from this solution. As a by-product is a small Amount of azine obtained which can be returned to the system.

As a cation exchanger, a material is preferably used that has strongly acidic groups, such as For example, contains sulfonic, phosphonic or phosphine groups. The cation exchanger is expedient based on a styrene divinylbenzene copolymer produced, but other resinous or polymeric products, such as. B. Acrylatdivinylbenzene copolymers or the like., included. The cation exchanger is preferably a sulfonated one Polystyrene resin with a divinylbenzene copolymer is networked. An inorganic cation exchanger, such as, for. B. an aluminosilicate or silica.

The solution of the Isohydrazons, hydrazone or azine is suitably treated at temperatures of 45 to 12O ⁰ C with the cation exchanger. The temperature depends on various factors; In general, however, it can be said that to shorten the reaction time as high a temperature as possible should be used, which does not impair the stability of the cation exchanger and does not promote the tendency of the isohydrazone to undergo degradation reactions other than hydrolysis. One factor that determines the upper temperature limit is the boiling point of the mixture of water and the aldehyde or ketone obtained by the hydrolysis, and if this boiling point is too low it is advisable to carry out the process under pressure. The solution of the hydrazine carbonyl derivative is preferably treated with the cation exchanger at a temperature between 50 and 100 ° C. Regenerated ketone, which is based on the

. Cation exchanger remaining can be practically quantitatively recovered by the Rinse the resin with water and distill the draining liquid.

Ammonia is preferably used as the base for releasing the hydrazine from the cation exchanger used, conveniently in the form of an aqueous solution containing 4 to 20 percent by weight of ammonia contains. Other suitable bases are solutions of sodium or potassium hydroxide.

It has been found that the hydrolysis efficiency of the hydrazine carbonyl derivative can be improved can, if the cation exchanger is used in such an amount that at least one Acid group is present per molecule of the hydrazine carbonyl derivative. Appropriately, the Cation exchanger used in such amounts that at most 95% of its capacity is consumed will. Quantities that lead to a consumption of 70 to 90% of the capacity of the cation exchanger, give practically quantitative yields.

In order to obtain high hydrazine yields, the excess of hydrogen ions must expediently be evenly distributed in the entire cation exchange bed. An even distribution can be effected by mechanical stirring, but this allows the beads of the cation exchanger be broken, surprisingly it was found that it is possible to use the cation exchanger treating with the carbonyl derivative of hydrazine by swirling the resin in an upwardly flowing stream of water; on in this way optimal yields are obtained. The preferred embodiment of the present The invention is therefore a process for the production of hydrazine or a substituted hydrazine, in which one has a fluidized bed of a cation exchanger in a circulating stream of water produces, an isohydrazone, a hydrazone or an azine is absorbed on this material and thereby the hydrazone or azine is hydrolyzed, the released ketone or the aldehyde from the cation exchanger removes, preferably by washing with water, the cation exchange material with a Base, preferably aqueous ammonia, treated and the hydrazine released by this base

winnt. The hydrolysis is carried out at elevated temperature, preferably, carried out at 45 to 100 ⁰ C.

The method according to the invention enables the cation exchanger to be regenerated by treatment with a mineral acid, such as. B. sulfuric or hydrochloric acid, followed by rinsing with water.

The hydrazine freed from the cation exchanger can be prepared in a known manner, e.g. B. by distillation, be won. Ammonia, which may contaminate the hydrazine, is released during rectification removed.

The drawing shows a device for carrying out the vortex method according to the invention.

The device shown in this drawing consists of a column 1, which is equipped with mesh filters 2 and 3 from e.g. B. polyamide or polyethylene terephthalate is provided. The bottom of the column is through a line 4 is connected to a circulation pump 5, which in turn through the line 6 with a heat exchanger 7 is connected. The heat exchanger 7 is through line 8 to the top of the column 1 connected. The line 4 is provided with an inflow line 9 and the column 1 with an outflow line 10 and an injection device 11 is provided.

When the process is carried out, the granular cation exchanger is located between the filters 2 and 3 in column 1. It is kept in a fluidized form by drawing water from the top of the Column is pumped through the heat exchanger 7 and the pump 5 to the bottom of the column. The isohydrazone-containing material is through the feed line 9 into the circulating water flow guided. In this way, the isohydrazone comes into contact with the cation exchanger and is converted to hydrazine and aldehyde or ketone, with the hydrazine on the cation exchanger is absorbed. To speed up the process, the temperature of this material is used during the cycle through the heat exchanger? . elevated. After the reaction has ended, the cycle interrupted the material and drained the liquid from column 1 through line 10. the Cation exchanger is washed with water to remove the remaining ketone or aldehyde remove; The resin containing absorbed hydrazine remains as a residue on the mesh filter 2 back.

Aqueous ammonia is now sprayed onto the cation exchanger bed through the spray opening 11; the ammonia is absorbed by the cation exchanger instead of the hydrazine. The released Hydrazine is collected from drain line 10 as a solution in aqueous ammonia. The hydrazine is obtained by distilling off from the aqueous ammonia solution. The solution of the aldehyde or Ketone obtained by treating the cation exchanger with isohydrazone is distilled, to recover aldehyde or ketone, which is then used to produce fresh isohydrazone can be used.

The following examples serve to explain the method according to the invention; all in these The parts and percentages given in the examples are parts by weight and percentages by weight, respectively.

! example 1

1.8 parts of methyl ethyl ketone isohydrazone were diluted with 50 parts of water and the mixture together with 15 parts of a sulfonated polystyrene resin crosslinked with divinylbenzene the 2.2 milliequivalents per gram, heated to boiling. After cooling to room temperature the resin was filtered off, washed with water and twice with 35 parts of an 8% aqueous ammonia solution stirred. After this ammonia treatment, the resin was filtered off; contained the filtrate 95% of the theoretical yield of hydrazine hydrate.

Example 2

1.8 parts of methyl ethyl ketone isohydrazone were diluted with 50 parts of water and ^{stirred with 11 parts of a sulfonated polystyrene resin crosslinked with divinylbenzene at 50 °} C. for 1 hour. The resin was then filtered off. The regenerated methyl ethyl ketone was recovered in 95% yield by distilling the filtrate. The resin was stirred twice with 20 parts of an 8% strength aqueous ammonia solution; 95% of the theoretical yield of hydrazine hydrate were released.

Example 3

It was diluted 2 parts Acetonketazintetrahydrat with 20 parts of water and 1 hour with 10 parts of a sulfonated, stirred crosslinked with divinylbenzene resin in the hydrogen form at 6O ⁰ C. The resin was separated off, stirred with 26 parts of a 4.0% strength aqueous ammonia solution and filtered. The filtrate contained 98% of the original hydrazine in the form of a 1.4% solution.

Example 4

80 parts of a sulfonated polystyrene resin were in a column with a ratio of height to 8: 1 diameter kept in a fluidized state by adding water in the amount of 600 parts was pumped up through the column per minute; the residence time in the column was 36 seconds. The total volume of the system was 800 parts. Then 9.67 parts of methyl ethyl ketone isohydrazone were added introduced into the system and rapidly absorbed by the resin. The water was at 50 ° C heated and run through the device for 1 hour to complete hydrolysis of the isohydrazone to hydrazine. The system was then drained and washed free of methyl ethyl ketone with water. The Methyl ethyl ketone was distilled off from the combined aqueous solutions. The resin was with 150 parts of a 16% strength aqueous ammonia solution and gave a 95% yield Hydrazine hydrate in the form of a 22% solution.

Example 5

108 parts / h of ammonia, 5.60 parts / h of chlorine and 25 parts / h of nitrogen were premixed and blown into 100 parts of methyl ethyl ketone at -5 to 0 ° C. over the course of 25 minutes. The reaction mixture was then allowed to cool to room temperature, the solid ammonium chloride was removed by filtration and the dissolved ammonia was removed in vacuo. The solution thus obtained, which contained 8 parts Methyläthylketonisohydrazon was charged with 61 parts (2.2 meq / g) of a sulfonated, cross-linked with divinylbenzene resin and 300Teilen water stirred and heated for 1 hour at 50 ⁰ C. The resin was filtered off and washed free of the ketone with water. The methyl ethyl ketone was from the

The filtrate and the wash liquors are distilled off. The resin was twice with 70 parts of a 5% aqueous Washed ammonia solution and the hydrazine obtained in 97% yield.

Example 6

In a glass column with a length of 60 cm and an inner diameter of 10 cm, 2145 parts (2.0 milliequivalents / g) of a sulfonated polystyrene resin crosslinked with divinylbenzene were kept in a fluidized state by adding 6000 parts of water at a rate of 1500 parts / Min. Were pumped up through the column. A Methyläthylketonisohydrazon-feed containing 258 parts Isohydrazon, was prepared by mixing / h for 2 hours at -5 ° to 0 ⁰ C 640 parts of ammonia, introduced 36 parts / h of chlorine and 100 parts / h of nitrogen through 3000 parts of methyl ethyl ketone and then the removed solid ammonium chloride and dissolved ammonia. The synthesis material was added to the water and resin circulating through the column, and the system was heated to 50 ° C. for 1 hour. The system was then drained and the resin washed with water until it was free of ketone. The methyl ethyl ketone was recovered in 98% yield. The hydrazine hydrate and the basic by-products were recovered from the resin by eluting it with 4,000 parts of a 16% aqueous ammonia solution using the sprayer 11. The hydrazine hydrate was obtained in 98% yield as a 21% solution by collecting the middle fraction of the runoff. Pure hydrazine hydrate was obtained by rectification.

35 Example 7

80 parts of a sulfonated polystyrene resin crosslinked with divinylbenzene (2.2 milliequivalents / g) in a column with a height to diameter ratio of 8: 1 in fluidized Maintained shape by adding water at a rate of 600 parts / min, up through the column was pumped. To the system, 24 parts of methyl ethyl ketazine was injected and the water was turned off Heated to 70 ° C for 15 minutes to effect hydrolysis. Then the system was drained and Washed free of ketone with water. The hydrazine hydrate was in 95% yield as a 22% solution obtained from the resin by diluting it with 150 parts of a 16% aqueous ammonia solution would.

Example 8

80 parts of a sulfonated polystyrene resin crosslinked with divinylbenzene (2.2 milliequivalents / g) in a column with a height to diameter ratio of 8: 1 in fluidized form kept by adding water at a rate of 600 parts / min, up through the column was pumped. 15 parts of benzaldehyde hydrazone was injected into the system and the water was Heated to 95 ° C for 30 minutes. Then the system was drained and the resin with water of benzaldehyde washed free. The hydrazine hydrate was obtained by diluting the resin with 150 parts of a 16% strength obtained aqueous ammonia solution in 80% yield.

Example 9

There were 80 parts of a sulfonated polystyrene resin crosslinked with divinylbenzene in a column with a height to diameter ratio of 8: 1 kept in a fluidized form by adding 600 parts / Min. Water has been pumped up through the column. The water was heated to 70 ° C and it were 20 parts of isohydrazone of the formula

H ₃ CN • CH ₂ CH ₂ OH

H ₅ C ₂ NH

injected into the system. The circulating water was held at 70 ° C for 30 minutes and then off drained the device. The resin was washed free of methyl ethyl ketone with water and then with 150 parts of a 16% strength aqueous ammonia solution washed to the / 9-hydroxyethylhydrazine to win. The substituted hydrazine was obtained in 97% yield as a 7% solution.

Example 10

There were 80 parts of a sulfonated polystyrene resin crosslinked with divinylbenzene in a column with a height to diameter ratio of 8: 1 kept in a turbulent state by 600 parts / min. Water was pumped up through the column. The water was heated to 50 ° C, and it became 17.5 parts of N-isopropyl acetone isohydrazone given into the system. The water circulated at 50 ° C for 90 minutes and then was out of the Drained the system, whereupon the resin was washed with water until it no longer contained any acetone. The isopropyl hydrazine was recovered from the resin in 78% yield by adding 150 parts of a 16% aqueous ammonia solution were passed through the resin.

Example 11

80 parts of a sulfonated polystyrene resin crosslinked with divinylbenzene (2.2 milliequivalents / g) in a column with a height to diameter ratio of 8: 1 in fluidized Maintained shape by adding water at a rate of 600 parts / min, up through the column was pumped. Into the system 28 parts of N-butylheptaldehyde isohydrazone was injected, and that Water was heated to 95 ° C for 30 minutes. Then the water was drained from the system and the resin was washed with water until it no longer contained any heptaldehyde. From the Harz Butylhydrazine was obtained in 72% yield by adding 150 parts of a 16% ammonia solution to the resin was treated.

Example 12

80 parts of a sulfonated polystyrene resin crosslinked with divinylbenzene (2.2 milliequivalents / g) in a column with a height to diameter ratio of 8: 1 in flowable form kept by adding water at a rate of 600 parts / min, up through the column

, 609 629/4

was pumped. In the system 21 parts Ν, Ν'-Diäthylmethyläthylketonisohydrazon were injected, and the water was heated for 15 minutes to 70 ⁰ C. Then the water was drained from the system and the resin was washed free of ketone. By treating the resin with 150 parts of a 16% ammonia solution, the symmetrical diethylhydrazine was obtained in 68% yield.

Example 13

There were 23 parts of acetone phenylhydrazone with 150 parts of water and 80 parts of a sulfonated Stirred polystyrene resin and heated the mixture to boiling for 15 minutes. After cooling it was the resin is filtered off and then washed free of acetone with water. The resin was used twice stirred with 150 parts of a 16% strength aqueous ammonia solution and filtered; it became phenylhydrazine obtained in 90% yield.

Eg 1 14

0.9 parts of methyl ethyl ketone isohydrazone, dissolved in 50 parts of water, were stirred with 15 parts of a phenolic resin containing —CH ₂ SO ₃ H groups (1.2 milliequivalents / g) for 1 hour at 50.degree After cooling, the resin was filtered off, washed free of ketone and extracted twice with 35 parts of an 8% strength aqueous solution of ammonia The resin was filtered off and a filtrate remained which contained 96% of the theoretical amount of hydrazine.

Example 15

There were 1.8 parts of methyl ethyl ketone isohydrazone in 50 parts of water with 11 parts of a polystyrene resin, which contained phosphonic acid groups, (3.0 milli-equivalents / g) Stirred for 15 minutes at 70.degree. By filtration and treatment of the resin according to the example 14 an 80% yield of hydrazine was obtained.

1 sheet of drawings

Claims (2)

Patent claims: 1. A process for the preparation of hydrazine or a substituted hydrazine by hydrolysis of a carbonyl derivative of hydrazine or a substituted hydrazine, characterized in that an aqueous solution of the carbonyl derivative with a cation exchanger in hydrogen form at a temperature of more than 40 ⁰ C treated and the hydrazine or the substituted hydrazine is released from the cation exchanger with a base. 2. The method according to claim 1, characterized in that the carbonyl derivative of hydrazine an isohydrazone of the following formula is used: To date, there have mainly been two processes for the preparation of hydrazines. The first consisted of the reaction of a ketone or aldehyde with chlorine or chloramine and an excess of ammonia, whereby isohydrazones of the following formula were obtained: