SU371194A1 - METHOD OF OBTAINING ACETONE - Google Patents

Description

This invention relates to a method for producing acetone by acetylene hydration.

A known method for producing acetone by hydrating acetylene or acetylene-containing gases in the presence of oxide iron catalysts with additions of zinc or manganese oxides, the yield of acetone is no more than 85%.

However, a known puff is characterized by a relatively low yield of the target product and a small bulk velocity not exceeding 60 liters of acetylene per liter of catalyst per hour.

In order to increase the yield of the target product and intensify the process, a catalyst containing oxide compounds of chromium in the amount of 7-8% of the total catalyst weight is used.

The proposed method for producing acetone allows the process to be carried out at volumetric rates x 250-700, and the yield of acetone is 95-98%.

The catalyst is prepared from pre-prepared iron oxide, chromic and nitric acids in the mixer. After 15-20 minutes of stirring, the catalyst fines are loaded into the mixer in an amount of not more than 40% by weight of ferrous iron.

Mix the contents of the mix thoroughly until a homogeneous mass is obtained.

The catalyst mass is molded, calcined at 500-600 ° C and cooled, after which it is crushed, sifted out and packed into drums.

Example 1. Acetylene containing 99.9% of the main substance is passed through the reactor, the upper and lower parts of which are filled with glass, and the middle is a catalyst in the amount of 40 ml, with a speed of 10 l / h. Water in the amount of 72 ml / hour is also fed to the upper part of the reactor.

Water, falling on a broken glass nozzle, is mixed with acetylene and heated to 360 ° C.

The vapor-gas mixture enters the catalyst, where the reaction takes place at 360-380 ° C.

The catalyst used is of the following composition: iron in terms of Fe2Oz 88%, chromium in terms of CrO2 of 7%.

Next, the reaction products enter the bottom of the reactor, then into the cooler, where they condense and enter the receiver.

Gaseous products are fed to the exhaust. After 300 hours of operation, the catalyst is regenerated for 5 hours with nar mixed with air at a ratio of 20 ml of water to 30 liters of air per hour. At the end of the regeneration, the catalyst completely restores the activity. Example 2. Acetylene-nitrogen mixture containing 50% acetylene and 50% nitrogen serves

at a speed of 18 l / h. Water is fed at a rate of 65 ml / hour.

The experiment is conducted according to Example 1.

Example 3. Use acetylene-containing gas of the following composition,%: acetylene 36,5; carbon dioxide 9.9; oxygen 0.7; carbon monoxide 2.4; hydrogen 32.8; methane 1.3; nitrogen 4.6;

1.35 propylene; methylacetylene 0.91; butane 1.44; divinyl 0.18; diacetylene 0.02; pentene-1 4.2; pentene-2 4.7.

The experiment was conducted according to Example 1.

The gas is fed at a rate of 26 l / h, water - 82 ml / h.

The results of the experiments are given in the table.

18

356

250

9

18.1 450 252

9

14.2 650

10.6 409 The subject of the invention. A method for producing acetone by the hydration of acetylene or acetylene-containing gases at elevated temperature in the presence of an oxide of iron catalyst and liberation of 25

81.5 0.02

98.0

320 81.8 0.03 285 97.7 84.0 - 95.0

0.77 0.86 290 20 by carrying out the desired product using known techniques, characterized in that, in order to increase the yield of the target product and intensify the process, a catalyst is used containing oxide compounds of chromium in an amount of 7-8% of the total weight of the catalyst.