DE509582C - Process for the catalytic conversion of gases or vapors - Google Patents

Description

Process for the catalytic conversion of gases or vapors A number of catalytic gas reactions are known to become more active on the surface through the use of the surface Contact masses of high porosity are favored.

It has now been shown that the effect of such I contact masses, especially at moderate temperatures, can be increased if you turn off the gases or vapors through contact masses from in the direction of the passing gases or Conducts vapors of decreasing pore size.

You can z. B. a wide pore aluminum oxide gel with a narrow pore Combine silica gel or a wide-pore and narrow-pore silica gel one after the other arrange.

Such surfactants can also be used alone or in combination with catalvic substances, e.g. B. loaded with metal oxides, used will.

The contact masses can be accommodated in a single contact space or distributed over several contact furnaces connected in series. You can furthermore, they can also be moved and, for example, fed in countercurrent to the gases.

Example I A mixture of acetylene and ammonia by four cascaded contact tubes heated to around 3500. The contact masses consist in all cases of silica gel with finely divided thorium oxide and Zinc oxide, but contained, arranged in the sense of the direction of flow of the gas mixture, the first two tubes are wide-pored, the third tube is a mixture of identical spatial parts Wide and narrow pore and the fourth tube finally only narrow pore gel. The yield of liquid condensation products is about 8501, contrary to theory to only 57 or 68 "/ 1, when using the same volumes of only wide-pore or only narrow-pored gel.

Example 2 A mixture of acetylene and ammonia is passed through at 300 ° two contact tubes connected in series, of which the first (in the sense the direction of flow) with wide-pore aluminum deficiency and the second with the same Volume parts of a narrow-pored aluminum gel is filled. Per liter of contact mass 43.7 ccm of nitrogen-containing condensation products are obtained while all other things being equal, using the same amount of a narrow-pore Aluminum gels alone have a yield of 16.3 cc and only 12.5 cc when used alone use of a wide-pored aluminum gel.

Example 3 A mixture of 1 part sulfur dioxide with g parts air at 4750 is passed over a contact mass made of platinum-coated silica gel, by loading silica gel with 6.25 g of platinum chloride per liter of carrier substance and then reducing it was produced.

If the same volume parts are connected in series, a wide-pored and a narrow-pore silica gel, each with equal amounts of platinum per unit volume has been loaded, a space-time yield is achieved. which is about 80 01o above the with narrow-pored gel alone and about 45% above that exclusively with wide-pored gel Gel achievable lies.

Claims (1)

PATENT CLAIM: Process for the catalytic conversion of gases or Steaming, characterized in that this is done by highly porous surface-active Contact masses of decreasing in the direction of the passing gases or vapors Pore size guides.