Catalyst for oxidation of anthracene to anthraquinone

 

(57) Abstract:

The invention relates to catalysts for the oxidation of anthracene to anthraquinone, which is an intermediate product in the synthesis of a number of valuable organic dyes. Increased activity and productivity of the catalyst is due to the fact that the catalyst containing vanadium pentoxide to titanium dioxide, the oxides of potassium and cesium deposited on an inert carrier further comprises iron oxide and manganese oxide, as well as media use steatite in the following ratio, wt.%:

the vanadium pentoxide - 3,1-3,3;

titanium dioxide - 4,2-4,4;

iron oxide - 1,4-1,8;

manganese oxide is 0.3 to 0.5;

the potassium oxide - 3,2-3,4;

the oxide of cesium - 0,5-0,7;

steatite - rest. table 1.

The invention relates to the catalytic oxidation processes and concerns of the catalyst intended for the oxidation of anthracene to anthraquinone, which is one of the most important products of aniline-dye industry, and can be used in the manufacture of synthetic dyes, pulp and paper industry in the process of razvedki cellulose instead of the sulfite liquor.

Known catalyst for okelani the deposits of vanadium, sulfuric acid salt, iron, manganese, potassium deposited on pumice. To increase the strength in the contact mass is injected diabase powder. This catalyst has a capacity of 22 g/lcath, the yield of anthraquinone 85-87% of the basic substance content in the product to 99.6%

The disadvantage of this catalyst is the low yield of anthraquinone /85 mol./ and low productivity of the catalyst, in addition, the catalyst has a low life.

Closest to the claimed catalyst is /Patents Germany N 2304683, class C 07 C 50/18, 1981/ the following composition:

On 100 wt.h. TiO2:

V2O51-45,0

Na2O or K2O or Li2O or Cs2O or Pb2or Te 1,0-45,0

P2O5or Nb2O50,05-3,0

the rest of the media.

As the carrier can be used inert media: Al2O3quartz, silicon carbide, aluminum silicate, magnesium silicate or a mixture thereof.

By applying an active mass gain catalyst particles of irregular shape. Oxidation of anthracene spend oxygen-containing gas with a bulk velocity 3000-40000 h-1at a temperature of 350-500oC. Load anthracene is 25-30 g/lka is anthraquinone when using raw materials with a high content of anthracene /98,5%/. In addition, in the reaction products was observed unreacted antracene, which complicates the process of separating pure anthraquinone.

The invention consists in that the catalyst for the oxidation of anthracene to anthraquinone containing vanadium pentoxide, titanium dioxide, oxides of potassium and cesium deposited on an inert carrier further comprises iron oxide and manganese oxide, as well as media use steatite in the following ratio of components, wt.

V2O53,1-3,3

TiO24,2-4,4

FeO 1,4-1,8

MnO 0,3-0,5

K2O 3,2-3,4

Cs2O 0,5-0,7

Steatite Else.

The technical result achieved by carrying out the invention is as follows: increases the activity of the catalyst in the oxidation of anthracene to anthraquinone, increases the yield of anthraquinone to 96% with a simultaneous increase in productivity of the catalyst to 35 g/lcath

The invention is illustrated as follows.

The introduction of iron and manganese oxides increases the activity of the catalyst, because they affect the rate of oxidation of anthracene to anthraquinone.

A reduction in the content of pentoxide more than 3.3 wt. leads to an increase in output of products of resinification, affecting the quality of the final product.

The decrease of the content in the catalyst of titanium oxide less than 4.2 wt. reduce the activity of the catalyst, and its increase over 4.4 wt. is inappropriate because it violates the uniform distribution of the components in the catalyst.

The decrease in the content of iron oxide less than 1.4 wt. leads to performance degradation of the catalyst, and it increased more than 1.8 wt. it is impractical.

Manganese oxide participates in redox processes on the catalytic surface of the media and reduce its content of less than 0.3 wt. reduces the performance of the process. The increase in the content of manganese oxide by weight more than 0.5. increases product of combustion.

The potassium oxide is a regulator of the catalytic system and the reduction in the content of his less than 3.2 wt. reduces the stability of the catalyst, and the increase in its content of more than 3.4 wt. it reinforces the desired effect.

The oxide of cesium promotiom this catalytic system and its content is less than 0.5. reduces the activity of the catalyst and increase it with the/P> The catalyst was prepared as follows.

In the mixer load 1566 g of water, to 67.5 g of vanadium pentoxide, 54.9 g of titanium dioxide, 54.9 g of titanium hydroxide, 128,7 g of iron sulfate, 16,1 g manganese sulfate, 15.2 g of cesium sulfate, 82.2 potassium hydroxide and 78.5 g of an aqueous solution of a copolymer based on polyvinyl acetate with vanillaware /50% concentration/, stirred for 1 hour to obtain a suspension.

The resulting suspension is sprayed on the carrier-steatite rings with the following dimensions: D 7 mm, 3 mm, H 7 mm Plating is carried out at a temperature of 90-100oC.

Get the catalyst composition, wt. V2O53,2, TiO24,4, FeO 1,6, MnO 0,35, K2O 3,25, Cs2O - 0.6, steatite 86,6.

The catalyst loaded into the reaction tube in the number 1800 cm3and heated at 50oC per hour to 350oC. At this temperature, carry out the activation of the catalyst with air flow of 1.75 nm3/h for 5-6 hours.

As a result of chemical reactions is the conversion of salts and hydroxides of the metals in the metal oxide.

The contents of the ingredients in the composition of the catalytic system is the optimal value and identified in mnogochislennumi, beyond the stated limits. The data are compared with the data of the catalyst chosen for the prototype.

Catalyst for oxidation of anthracene to anthraquinone, including vanadium pentoxide, titanium dioxide, oxides of potassium and cesium deposited on an inert carrier, characterized in that it additionally contains iron oxide and manganese oxide as the carrier of steatite in the following ratio, wt.

The vanadium pentoxide 3,1 3,3

Titanium dioxide 4,2 4,4

Iron oxide 1,4 1,8

Manganese oxide 0,3 0,5

The potassium oxide 3,2 3,4

The cesium oxide 0,5 0,7

Steatite Ostalnoe

 

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