DE1443717B - - Google Patents

Description

1 2

The invention relates to a method of production are brought together with the carrier and on

of a mainly acetonitrile-containing reac-

tion mixture through catalytic conversion of steam. Then at 120 ⁰ C in the dry

Propylene with ammonia at high temperature and slowly dried and then cabinet dried for 2 hours

under normal or overpressure in the vapor phase. Calcined 5 45O ⁰ C in a stream of air. The catalyst

It is known that olefins with ammonia on aluminum look uniformly brown-yellow and have a partial

Nium oxide catalysts in the gas phase to organic particle size of about 2 mm. Stepping while calcining

Implement nitrogen compounds. As amination solid-state reactions. The above-mentioned access

Contacts are also metallic cobalt and nickel, therefore says nothing about the nature of the composition

partly with manganese oxide on magnesium-silicon io catalytically active phases.

Dioxide carriers activated, for reactions under high example Ib

Pressure (110 to 215 atmospheres) used. It is also possible _TT ■ ,, -, *.

knows, amination reactions in the presence of reaction on the catalyst

Oxygen on vanadium pentoxide-platinum contacts on The catalyst was in a tubular reactor with

Make silicon carbide carriers. 15 External heating with ammonia and propylene in the

In these known processes, the reaction ratio is 1.2: 1 and resulted in a reaction

conditions in addition to the application of a high Druckes tion temperature of 450 ° C a conversion to acetonitrile

sometimes quite expensive or the yields - be of 14% and a yield of 55%, based on

drew on the reaction conditions - relatively low. Propylene.

The invention is based on the object, ao Example 2a

a method for producing a mainly producing the catalyst
Acetonitrile-containing reaction mixture through

catalytic conversion of propylene with ammonia To produce 500 ml of catalyst was

to be indicated in the vapor phase at high temperature, extruded aluminum oxide, which is X-ray

which, when new suitable catalysts were used, 25 could be graphically characterized as 7-Al ₂ O ₃ and a

gives higher yields. had a specific surface area according to BET of 140 qm / g,

The characteristic is seen in the fact that one has an active layer of cobalt-molybdenum oxide

the reactants are loaded with a space velocity. The atomic ratio of Co: Mo became

from 2500 to 40001 · h " ¹ at a temperature of 1: 1. The total amount of heavy metal

410 to 520 ° C in the presence of a catalyst by -3 ° oxides was 20% of the carrier weight. For impres-

based on silica or aluminum oxide as gnation, 102 g of cobalt nitrate hexahydrate and

Carrier in addition to an oxygen compound of molyb- 58.5 g of ammonium molybdate hydrate in 256 ml of water

Then dissolved oxygen compounds of titanium, iron, cobalt. This amount of solution was removed from the vehicle

and / or contains zinc, the molybdenum content being completely absorbed. Then the

at least 30 atomic percent, calculated on the molybdenum mass, carefully down to 12O ⁰ C in the drying cabinet.

oxide, and the atomic ratio of warms and then 2 hours at 450 ⁰ C in the air stream

Molybdenum to foreign metal additives is 1: 0.5 to 1. annealed. The finished contact particles had one

From Industrial & Engineering Chemistry, Vol. 45 length of about 15 mm and a diameter of

(1953), pp. 282 to 286, is a method of making about 1.5 mm.

of a mainly acetonitrile-containing reac- 4 ° Example 2b

tion mixture through catalytic conversion of conversion on the catalyst
Propylene with ammonia at high temperature in the

Gas phase known; as a catalyst is MoO ₃ on The catalyst was with propylene and ammonia

Used alumina. in a ratio of 1: 1.1 at a space velocity

The present invention is to consist in poly-45 of 2950 h ^-1 in a section which can be heated

acid generators (Mo) always acted upon together with titanium, iron, block furnace reactor. The reaction tube

To use cobalt and / or zinc. The advantages of this consisted of quartz glass. The reaction products were

The combination consists in the fact that the possibility of having a cooler, freeze traps and a downstream

is to use lower reaction temperatures passed scrubbing column with acetone. From the

and thus better yields (85 instead of 60%, based on 50 residual gases, entrained acetone could be in

on propylene, 95%, based on ammonia, instead of 80%) of a further freezing trap. the

to achieve. Furthermore, the residence times of the gases were then measured in a dry gas meter

kept lower and thus more favorable space-time and, in certain time segments, gas chromatography

yield of the reactor can be achieved. phically analyzed. The determination of the acetonitrile im

Example la ⁵⁵ condensate of the freeze traps and in the acetone

_TT;, -.,, .. Solution was also carried out by gas chromatography. To the

Preparation of the catalyst control, the condensates were each ultra-red

Examined spectroscopically on an aluminum oxide support with a total.

surface <1 m² / g is prepared by impregnating a At a reaction temperature of 465 ⁰ C gave

active contact layer with the following chemical composition, for example a conversion to acetonitrile (based on

composition applied: on propylene) of 19.5% ^and a yield of about

10% TiO ₂ -MoO ₃ - with an atomic ratio of ⁸⁵ ° / ° ·. ? as was the ultra-red spectrum of the condensate

win τ; · IUr, - η 7 ■ 1 -Lie / p "η practically identical to that of the

VUIl J. Jl. iVJHJ Uj /. χ "ρ X / λ rCoV / 3. ·« · ■ ». 1 · 1 ι, · L · ι -NT-1« yes

borrowed technical acetonitrile. Not implemented

For this, 6.6 g of ammonium molybdate in 20 ml of 65 ammonia was largely recovered,

Dissolved water. In the same way, the decomposition to nitrogen and hydrogen was less than the aqueous solution

Solution of iron trichloride and an ethanolic solution above-mentioned conditions z. B. less than 5%

solution of titanium (IV) chloride produced. The solutions If the concentration of ammonia or hydrogen

tration, thermally slightly deactivated catalyst and higher space velocity the NH bands in the UR spectrum of the condensate are increasing. It is therefore on this path possible to direct the reaction in the direction of amine production.

Example 3a
Manufacture of the catalyst

In a manner analogous to that described in Examples 1 and 2, a catalyst with 10 ⁰ / o zinc oxide-molybdenum oxide was prepared on a finely divided silica support with a BET surface area of 180 m2 / g, which was preloaded with 0.5% potassium carbonate .

Example 3b

Implementation on the catalyst

The atomic ratio of zinc to molybdenum was set to 0.9: 1. The activity test was carried out as indicated above. At a reaction temperature of 470 ⁰ C to a conversion yielded (based on propylene) of 12% and a yield of 51 ° / _0th

Claims (1)

Claim: Process for the preparation of a mainly acetonitrile-containing reaction mixture by the catalytic reaction of propylene with ammonia at high temperature in the vapor phase, characterized in that the reactants with a space velocity of 2500 to 40001 · h " ¹ at a temperature of 410 to 520 ° C in The presence of a catalyst on silica or aluminum oxide as a carrier, in addition to an oxygen compound of molybdenum, contains oxygen compounds of titanium, iron, cobalt and / or zinc, the molybdenum content being at least 30 atomic percent, calculated on molybdenum oxide, and the atomic ratio of molybdenum to foreign metal additions 1: 0.5 to 1.