The preparation method of catalyst for the dehydrogenation of alkyl benzenes

 

(57) Abstract:

The invention relates to the production of catalysts for the dehydrogenation of alkyl benzenes predominantly fraction10. The method is as follows: by sequential introduction of a mixed oxide of iron III, bentonitovuju clay and copper chloride in a mass ratio of 10:80:10. Add 30-40 wt.% water, calculated on the weight of the mixture. Produce a molding mixture by extrusion through a Spinneret with a diameter of 4-8 mm metal sheets, drying at a temperature of 60-75oC for 3-10 min, grinding of the obtained fibers in the pellets with a length of 6-12 mm and calcining at a temperature of 330-370oC for 1.5 to 3 hours Technical result of the invention - can be disposed side fraction WITH10with fractionating xylenes production of aromatics, which allows to solve the environmental problem of smoke emissions associated with the burning need of this fraction, as well as the expansion of the resource base of the processes of obtaining high-quality types of petroleum coke. table 2.

The invention relates to the production of catalysts for dehydrogenation and polymerization of alkyl benzenes, predominantly fraction

Fraction WITH10is a byproduct of the production of aromatic hydrocarbons and mainly consists of alkyl benzenes (see tab. 1). She has virtually no foreign markets and is used mainly as a fuel component that adversely affects the ecological environment. A high degree of aromaticity, short aliphatic fragments, the absence of sulfur and insoluble components, the low content of other heteroelement allow you to use the fraction WITH10as a valuable raw material for production of needle coke. To raise the temperature of boiling and maksuameti faction need to develop a comprehensive dehydrogenation catalyst of polymerization, the use of which would be obtained from a mixture of alkyl benzenes mixture of aromatic oligomers and polymers of greater molecular weight.

A known method of producing catalyst for the dehydrogenation of alkyl benzenes by mixing in a paddle mixer, iron oxide, chromium oxide, potash and other promoting additives with the addition of water and subsequent forming, drying and calcination [Technologystatus known method is the inability to use the obtained catalysts for the polymerization of alkyl benzenes.

The closest technical solution to the claimed invention is a method of producing catalysts for the dehydrogenation of alkyl benzenes on the basis of iron oxide, which consists in mixing iron oxide and promoting additives with water, followed by molding and drying [RF Patent 2064829, B 01 J 23/652, bull. 22, 1996].

The disadvantage of the prototype is limited scope catalyst only for the dehydrogenation of alkyl benzenes with the aim of obtaining monomers used in the production of rubbers and plastics.

The invention solves the technical problem to extend the functionality of a catalyst for the dehydrogenation of alkyl benzenes, namely: obtaining catalyst for dehydrogenation and polymerization of alkyl benzenes, mostly faction WITH10by obtaining a mixture of polymers of aromatic composition of higher molecular weight, suitable for the production of high-quality needle coke.

This task is solved in that in the preparation method of catalyst for the dehydrogenation of alkyl benzenes on the basis of iron oxide, which consists in mixing iron oxide and promoting additives with water, followed by molding and heat-treated according isob with subsequent mixing with water, forming and heat treatment.

The method is as follows: by sequential introduction of mixed iron oxide (3), bentonitovuju clay and copper chloride (2) in a mass ratio of 10:80:10 to obtain a homogeneous powder mixture. Add 30-40 wt.% distilled or rectified water, calculated on the weight of the mixture components. Produce a molding mixture by extrusion through a Spinneret with a diameter of 4-8 mm metal sheets, drying at a temperature of 60-75oC for 3-10 min, grinding of the obtained fibers in the pellets with a length of 6-12 mm, calcining at a temperature of 330-370oC for 1.5 to 3 hours

The quality control of the catalyst is in the analysis of the products obtained by thermal processing of concentrate the aromatics fraction10in a laboratory reactor flow type on granular catalyst based on iron oxide and copper chloride on such parameters as the initial boiling point of the product, the temperature of the distillate 10% of the volume of the product and coking ability of the product to Conradson.

Primer

In the apparatus with a paddle stirrer download, wt.%: iron oxide 10; chloride copper 10; bentonitovoj clay 80. There must be a thorough sosicrates water, calculated on the weight of the mixture. The mixture is brought to a thick homogeneous paste-like consistency. Then it is formed into fibers by extrusion through a Spinneret with the diameter of 5 mm on metal sheets, drying at a temperature of 60oC for 5 min, the grinding of the obtained fibers in the pellets with a length of 8 mm, calcination at a temperature of 360oC for 2 h

Corresponding indicators of the source of the aromatic fraction WITH10and this same faction held thermal training on the obtained granular catalyst in a laboratory flow reactor of the type shown in the table. 2.

Example 2

The catalyst is prepared analogously to example 1, but in contrast to example 1, the extrusion mixture through a Spinneret with the diameter of 8 mm, the drying is performed at a temperature of 75oWith the grinding of the obtained fibers is performed on pellets 12 mm in length, and calcination is carried out within 3 hours

In table. 2 shows the corresponding figures fractions WITH10held thermal training on the obtained granular catalyst in a laboratory flow reactor type.

It is known that typical raw coking process are products of type distillato 87-97 wt.%, characterized by initial boiling point of TNK= 230-350oWith the temperature of the distillate T10= 250-380oWith and coking ability to Conradson 5-20% and above. As can be seen from the table. 2, thermal performance of the prepared fractions WITH10meet the indicators adopted for typical species of raw coking, and itself prepared fraction can be used as raw material for production of needle coke.

The claimed invention meets the criterion of "industrial applicability", supported by a combination of the following conditions:

the invention is intended for use in industry;

- the test results of the dehydrogenation catalyst of alkyl benzenes show that its use allows to obtain raw materials for the production of needle coke of desired quality.

The proposed method has the following advantages: implementation of the invention makes it possible to dispose the side fraction WITH10with fractionating xylenes production of aromatics, which allows to solve the environmental problem of smoke emissions associated with the burning need of this faction; expanding the raw material base PR dehydrogenation of alkyl benzenes on the basis of iron oxide, comprising a mixture of iron oxide and promoting additives with water, followed by molding and heat treatment, characterized in that as the promoting additives used chloride of copper and impose additional bentonitovuju clay as an inert carrier and a binder, which is mixed with iron oxide in a mass ratio of 10:80:10, respectively.

 

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