SU780881A1 - Catalyst for hydrogenation of aromatic hydrocarbons and cleaning gases from oxygen and carbon dioxide and method of producing it - Google Patents

Description

(54) CATALYST FOR HYDROGENING OF AROMATIC HYDROCARBONS AND PURIFICATION OF GASES FROM OXYGEN AND CARBON OXIDES AND METHOD FOR ITS PREPARATION OF THE INVENTION A nickel-chromium alumina catalyst for the hydrogenation of organic compounds, containing 15–20% alumina, 30–50% chromium oxide, and the rest nickel is known. It is obtained by co-precipitating with a solution of soda basic nickel carbonate and chromium and aluminum hydroxides from their nitric acid salts at 50–900 s and constant pH, followed by filtering the mixture by washing to the complete absence of nitrate, rat-ion, drying, grinding, tabulating and reconstructing . The known method allows to obtain a crystallizer with a high catalytic activity. However, the presence of filtration stages of the mixture, washing to the complete absence of the nitrate ion greatly complicates its implementation. This leads to a lack of reproducibility of the catalytic activity and physical properties of the catalyst. The closest to the proposed technical effect and achievable effect is a catalyst for the hydrogenation of aromatic hydrocarbons and gas purification from oxygen and carbon monoxide, containing, wt.%: Nickel 8-33, chromium oxide 4-12 and alumina 38-81. A known catalyst is obtained by treating a pasty or dry mixture of basic nickel carbonate and aluminum oxide or aluminum hydroxide with a solution of chromic anhydride, followed by drying, calcining, and then blending. Chromic anhydride is treated with a weight ratio of basic nickel carbonate to chromic anhydride equal (3-5 ): 12 . The disadvantage of the method lies in the low activity of the known catalyst, since its activity, determined by the rate of hydrogenation of carbon monoxide at 135 ° C, pressure of 1 atm, a space velocity of 40,000 h, is g of catalyst.h and the activity in the hydrogenation of benzene CfcHb means 7% D - - - - - - t of 1.4 g- catalyst. The purpose of the invention is to obtain a catalyst with increased activity.

The goal is achieved by the fact that the catalyst dp hydrogenates aromatic hydrocarbons and purifies gases from oxygen and carbon monoxide and gains the components in the following ratio, wt. %:

Nickel32.8-50.0

Chromium oxide 20.4-23.8 Alumina Rest The catalyst is obtained by treating a pasty or dry mixture of basic nickel carbate and aluminum oxide or aluminum hydroxide with a solution of chromic anhydride followed by drying, calcining and pelleting, and the treatment with chromic anhydride is carried out by weight ratio of basic nickel carbonate to chromic anhydride, equal to (2.2-2.8): 1. The catalyst activity, determined by the reaction rate of hydrogenation of carbon monoxide at a temperature of 135 ° C and a pressure of 1 atm, a volume rate of 40,000, is 35.2-;

see with

 g. catalyst. in reaction of benzene hydrogenation

is 9.1-13.7 b

g -catalyst-h i. The rate of hydrogenation of carbon monoxide with methane is increased by 1.5-1.6 times and the rate of hydrogenation of benzene to cyclohexane is 30-40%.

With a decrease in the ratio of basic nickel carbonate (OCH), CrOa C (3-5): 1 to (2.2-2.8) :, for each kilogram of nickel, a larger amount of chromium is obtained, as a result of which more complete binding of nickel takes place oxygen compounds of nickel with chromium, which leads to an increase in catalyst activity.

For example, distilled water is added to a mixture of basic nickel carbonate and alumina (170 g of OCH and 45 g of A 120 h), the mass is thoroughly mixed. To the resulting paste, a solution of chromic anhydride (68 g of CrO, in 55 ml of distilled water) is added, the ratio of OKH: C gOn is 2.5: 1, and the mass is again stirred first at room temperature, then heated at

o water bath (or using electric heating of the mixer, if the preparation is carried out in a Z-shaped mixer),

The catalyst mass is dried

5 at 100 s for up to an hour, calcined in air at 380 ° C for 8 hours, mixed with graphite and pelletized.

The resulting catalyst contains 38.1% nickel and 20.4% Cr „0, oxide

Q aluminum - the rest.

EXAMPLE 2. For the preparation of a catalyst, OKH 192 g, A1, 030, 8 g, Cr04b8.2 g are taken.

 The ratio of OKH: C r0 is 2.8: 1. The sample obtained contains in oxide form, wt.%: Nickel 50, Cr Cyjj 23.8, alumina 26.2.

Example 3. For the preparation of the catalyst, 57.9 g of oxide 0 of aluminum 57.7 g and chromic anhydride 57.7 g were taken.

The ratio of the initial components of the CHP: CrO is 2.2: 1. The sample obtained contains, in oxide form, wt.%: Nickel 32.8, Og 0.23.6, and aliquina oxides 43.6. Comparative data on the activity of the known and present catalysts are given in the table.

The ratio of OKN: CrO.

Composition, wt.%:

nickel

CrO-j

AljO ,,

The activity determined by the rate of the hydri reaction, the reaction with a content of 0.1%, atm, temperature, speed is 40000

g catalyst-h

2.2: 1, 5: 1 2.8: 1

50.0

38.1 20.4 23.8 26.2 41.5

42.3

44.9

35.2

The temperature of complete hydrogenation of carbon oxides with a hydrogen content is: CO — 1.0%, CO2 — 0.85%; total speed 5000 h, r 1 atm

WITH

"

Residual concentration in the hydrogenation of 1% CO in hydrogen: atm, the total rate of 20000 h, t 17 ° C ()

Activity, determined by the reaction rate of the Hydrirog CnH 7.4

vanilla benzene

Gcatalizator Residual CO and CO content less than 5

Claims (2)

1. A catalyst for the hydrogenation of aromatic hydrocarbons and the purification of gases from oxygen and carbon monoxide, containing nickel, chromium oxide and alumina, is about the fact that, in order to SEEM the activity of the catalyst, it contains components in the weight of cooTHCxiieHHk. %; Nickel 32.8-50.0 Chromium oxide 20.4-23.8 Alumina Rest 2. A method for producing a catalyst according to claim 1, by treating a paste-like or dry mixture of a basic carbo. Continued table 190 200 230 240 10-15 10-15 thirty 13.7 11.5 9.1 3 Nata nickel and aluminum oxide or hydroxide with a solution of chromoscetic anhydride, followed by drying, calcination and tableting, with the aim of obtaining chromic anhydride with a weight of the ratio of the primary nickel carbonate to chromic anhydride is (2.2-2.8): Information sources, 45 taken into account in the examination 1, USSR Copyright Certificate No. 229467, class, B 01 J 37/02, 1969. 2. USSR author's certificate No. 403429, cl. B 01 J 23/86, 1977 50 (prototype). , 5 / ..3 cm / m of each component.