SU759121A1 - Catalyst for producing cyclohexane - Google Patents

Description

(54) CATALYST FOR PREPARATION OF CYCLOGEXANE

This invention relates to dpg catalysts for the production of cyclohexane. A known catalyst for the production of cyclohexane by the hydrogenation of benzene, which is a leached nickel bromine aluminum alloy I. The closest to the proposed technical essence and the achieved result is a catalyst for the production of cyclohexane based on ni (selphalt-aluminum-alloy containing, in addition, weight.% either 0.1-1.0 rhenium, or 1-2 manganese, or 2-7 tungsten 12}. The known catalyst has insufficient activity and stability, such as iOO% output of cyclohexane in the presence of izd, eats Catalyst is achieved through 80 missions, and the catalyst stability is expressed through, the output of cyclohexane after 16 experiments is 92%. The purpose of the invention is to increase the catalyst activity and stability. The goal is achieved by the fact that the catalyst for producing cyclohexane based on nickel-tungsten-aluminum alloy, the initial alloy additionally contains zirconium at the following ratio of components, wt%: Zirconium 0.5-10.0 Nickel37.0-46.5 Tungsten2-7 AluminumOther The proposed catalyst has a higher nnoy activity and stability in comparison with the known. Thus, a 100% yield of cyclohexane in the presence of the proposed catalyst is reached in 50-60 minutes and the catalyst is stable in time - after 16 experiments, the yield of cyclohexane is 100%. The proposed catalyst is prepared as follows. Alloys of the catalyst are prepared in a high-frequency furnace in the usual manner. The content in the alloy, wt.% Nickel - 37-46,5, | tungsten - 27, zirconium 0.5-10, aluminumDetal. 3 The alloy is ground to a grain size of 0.25 mm. The catalyst is activated by leaching the alloy with a 20% aqueous solution of caustic soda at 100 ° C for 1 hour. After the end of alkalization, the catalyst is repeatedly washed with distilled water to a neutral medium. Thereafter, absolute water of residual water is removed from the catalyst and the treated catalyst is ready for use. Example. In tab. Figure 1 shows the activity of the Mi-W-Zr-A1 catalyst system in the hydrogenation of benzene and the 100% production of cyclohexane over a certain time. Experimental conditions: sample (100%) of benzene for hydrogenation 200 ml, sample of catalyst — 0.25% by weight of benzene, hydrogen pressure — 40 atm, temperature 180 ° C. Example 2. In table. Table 2 shows the results obtained by studying the effect of hydrogen pressure on Ni-W-Zr-A1 42: 3:: 5:50 catalyst Condition: a weight (100%) of benzene for hydrogenation — 200 ml, a weight of catalyst — 0.25% by weight benzene, the temperature of the experiment - 180 ° C.

3.3 6.0

7.0

Nf: W: Zr: Al 46: 3: 1: 50

10.0

17.0 19.0 21.0 17.0

155

30.6

41.0 48.0 75 36.0

41.0

35.0

85

80

39.0

46.0

60

48.0

58.0 55.0 65.0

50 52.0 61.0

60 45 53.0

65 Example 3. In table. 3 gives the results of the effect of the test temperature in the presence of Ni W-ZV-A1 42: 3: 5: 50 catalyst on the output of cyclohexane. Process conditions: sample (100%) of benzene dp hydrogenation 200 ml, sample, catalyst - 0.25% by weight of benzene, hydrogen pressure - 40 atm. Example 4. With an increase in the amount of N1-W-Zr-A1 42: 3: 5: 50 catalyst from 0.25 to 1.5% by weight of 200 ml of benzene at i80 ° C and a hydrogen pressure of 60 atm, yield, cyclohexane without impurities Allowing a straight line to the limit. The optimal condition for the proposed catalyst (Tables 2 and 3) is a temperature of 160-180 ° C, and a hydrogen pressure of 4060 atm. PRI me R 5. In table. Figure 4 shows the results of testing the stability of Ni-W-Zr-AI 42:: 3: 5: 50 catalyst in a Vishnevsky autoclave in discontinuous form with vigorous stirring in a suspended state. Test conditions: sample (100%) of benzene for hydrogenation — 200 ml, sample of catalyst — 3% by weight of benzene, hydrogen pressure 60 atm, temperature — 180 ° C, test duration — 40 min. Table 1 .

12 25 39 41

four

12

nineteen

21 43

21

Ni: W: Zr t A1

 42: 3: 5: 50100 100

100100100

27 43 65 67 68

19 35 55 57 56

50

40

Table 3

Table 4

100 100100 100

Claims (2)

1. USSR author's certificate number 246491 cl. C 07 C 13/18, 1968, 2. USSR author's certificate number 255226, cl. C 07 C 13/18, 196 (prototype).