SU733721A1 - Catalyst for methanol synthesis and carbon monoxide conversion - Google Patents

Description

one

This invention relates to the preparation of catalysts.

A known catalyst for the synthesis of methanol and the conversion of carbon monoxide, containing oxides of copper, zinc, chromium and graphite 1, which has a low stability.

The closest to the described invention to the technical essence and the achieved effect is a catalyst for methanol synthesis and conversion: carbon monoxide, containing zinc oxide, copper, chromium, graphite and modifier. As modifiers, oxides of molybdenum, tungsten, and vanadium 2 are used.

The disadvantage of this method is low catalyst activity.

The aim of the invention is to increase the activity of the catalyst.

This goal is achieved by obtaining the described composition of the catalyst for methanol synthesis and the conversion of carbon containing zinc, copper, chromium oxides, graphite and the modifier — skeletal metallic copper with the following content of components, wt.%:

29-34

Zinc oxide 14-16 Chromium oxide 5-45 Copper oxide Skeletna mele10-50

Rest. Graphite

A distinctive feature of the invention is the use of skeletal copper as a modifier in the specified ratio with other components.

The invention allows to increase the yield of methano.pl 1.5-6 times and to provide an equilibrium content of carbon monoxide in the converted gas 15 already at 220s,

EXAMPLE 1 A slurry of 230 g of zinc oxide in distilled water is prepared in a mixed reactor T15le. The resulting suspension is stirred with a stir bar for 0.5 hours, then settled for 3 hours and stirred for another 1 hour. The rotation speed of the stirrer in the mixer is 100 rpm. In another reactor, the chromate solution is prepared.

25 98.5 g of chromic anhydride in water.

Under constant stirring, you can add YuOg of basic carbonate 30 copper to the prepared chromate solution with constant stirring. The mixture is stirred for

4 hours at, the mixture is introduced into a suspension of zinc oxide and thoroughly mixed for 4 hours. Mixing is accompanied by heating and thickening of the contact mass. The resulting mass is dried in air for 12 hours, and then in a drying oven at 100ISO C for 8 hours. After drying, the catalyst mass is subjected to a proggshke for 8 hours.

Skeletal copper is prepared by exposing a 40% KOH solution to a finely divided alloy of composition AK — 50% and Cu — 50% for 2 hours before the evolution of hydrogen ceases. Then the alloy is distilled with distilled water and 274 g of the resulting mass is mixed with a calcined copper chromium mixture. After drying at 110-120s, the catalyst mixture is mixed with 20 g of graphite and tableted under a pressure of 6000 kg / cm into tablets 6 x 4 mm. The finished catalyst is calcined at 260 s for 8 h. The resulting catalyst contains 35% CO.Q, 20% Ctj, 29% Zno, 14% and 2% graphite.

Example 2. According to Example 1, using 230 g of ZhO, 460 g of malachite, 400 g of skeletal copper, 98.5 g of chromic anhydride and 20 g of graphite, a catalyst is obtained containing 15% CuO, 40% Cu, 29%: Oh, 14% 0 and 2% graphite.

ri p i me r 3, For example 1, using 290 g of ZnO, 1380 g of malachite, 100 g of skeleton copper, 98.1 g of chromium angridride and 20 g of graphite, a catalyst is obtained containing 45% of CuO, 10 % Sy, 29% zno, 14% and 2% graphite,.

Example 4, Example 1, using 290 G2. O., 153 g of malachite 500 g of skeletal copper, 98.1 g of chromic anhydride and 20 g of graphite, a catalyst is obtained containing 5% CCO, 50% CU, 29 % O, 14% and 2% graphite.

Example 5. In Example 1, using 340 g of ZnO, 153 g of malachite, 500 g of skeletal copper, 112 g of chromic anhydride and 20 g of graphite, a catalyst is obtained containing 5% 2 CLIO, 50% Cu, 34% Zno,

, Cr, O.g, and

2% graphite.

Example 6. A known catalyst was prepared according to the procedure of Example 1, using 290 g of Zno, 1676% of basic copper carbonate, 0.5% of tungsten, molybdenum and vanadium oxides, 98.5 g of chromic anhydride and 2% of graphite.

The resulting catalyst contains 55% Cue, 0.5% oxides of tungsten, Mo5 libden and vanadium, 29% ZnO,. 14% CiTjO and 2% graphite.

Example 7. Synthesis of methanol on the obtained catalyst samples was carried out at a pressure of 250 atm. using a mixture of hydrogen and carbon monoxide, taken in a tri ratio. 4 in the presence of 5% to 10% carbon dioxide in a gas and a space velocity of 40,000 h.

The results of the tests are shown in the table.

Appro-8. In the reaction of the conversion of carbon monoxide with steam, the catalyst prepared according to example 1, with a flow rate

2000 h-, the ratio of steam: gas - 1, reduces the content of carbon monoxide in gas from 18.8% to residual

temperature, C;

g 180 200 220 0.4 .0.2 0.1 As can be seen from the above data, even when the proposed catalyst practically provides the equilibrium content of carbon monoxide in the converted gas, which for these conditions is 0.107% by volume, while the catalyst obtained The prototype, at the indicated temperatures, does not activate the reaction of carbon monoxide conversion.

Claims (1)

1. For the sake of Germany 2122952, cl. 12 g- 11/54, 1971, 2, Authors Certificate of the USSR Q 215505, cl. At 01 I 37/04, 1967 (prototype).