KR101652601B1 - Catalyst regeneration apparatus - Google Patents

Abstract

The present invention relates to a catalyst regeneration apparatus for regenerating spent catalyst particles, in which a reactor body is integrally formed with a decomposition injecting apparatus, and a circulation direction of gas is reversed in a combustion zone and a chlorination zone to improve reaction efficiency And more particularly,

Description

[0001] CATALYST REGENERATION APPARATUS [0002]

The present invention relates to a catalyst regeneration apparatus, and more particularly, to a catalyst regeneration apparatus capable of regenerating a spent catalyst in contact conversion for converting a hydrocarbon into a useful hydrocarbon product so as to be reused in a hydrocarbon conversion reaction.

In the petrochemical industry, continuous catalytic conversion proceeds. Fluidized Catalyst Cracking is an important process in the production of light hydrocarbon components and is an important process in the production of ethylene and propylene. In the flow catalytic cracking process, the fluidized catalyst is continuously circulated between the reactor and the regenerator.

Another route of propylene production can be obtained by dehydrogenation of propane through catalytic dehydrogenation. However, the reaction is a strong endothermic reaction and requires high temperature to proceed the reaction at a satisfactory rate. As the catalytic reaction progresses at a high temperature, a side reaction therewith involves pyrolysis and coke formation reaction, and the degree of such side reaction is a key factor determining the selectivity and activity of the catalyst. One of the side reactions, the coke formation reaction, covers the active material on the catalyst with coke, thereby blocking the contact with the reactants, thereby lowering the overall reaction conversion rate. Further, as the production of coke proceeds, the inlet of the pores existing in the catalyst is blocked to dampen the active substance present in the pores, thereby promptly promoting deactivation. Thus, when the accumulation of coke deposits causes inactivation in the next stage of the dehydrogenation reactor, a catalyst regenerator is connected to regenerate the catalyst to regain the activity of the catalyst to remove coke deposits.

The catalyst regeneration apparatus in mobile phase mode generally comprises a reaction zone which may comprise a series of three or four reactors and a reaction zone comprising any number of stages, generally the combustion stage, the subsequent chlorination stage, Is used.

Referring to FIG. 1, U.S. Patent Application No. 2008/0159930 discloses a catalytic cracking injector 320 having an upper end and a lower end for receiving a catalyst from a hydrocarbon conversion zone, Discloses a catalyst regeneration apparatus for a hydrocarbon conversion catalyst comprising a hydrocarbon conversion zone comprising an adsorption vessel 400 for receiving chlorinated gas and a regeneration vessel 420 having a combustion zone.

However, in such a conventional catalyst regenerating apparatus, the catalyst regenerating apparatus and the cancellation injecting apparatus are separated and separated, and the configuration of the apparatus is complicated, resulting in an increase in facility cost and a problem of difficulty in operation and management.

SUMMARY OF THE INVENTION An object of the present invention is to overcome the problems of the prior art described above. One object of the present invention is to simplify the structure of a catalyst regeneration device, reduce facility cost, and improve the efficiency of a catalyst regeneration reaction.

Another object of the present invention is to improve process productivity by minimizing catalyst damage by suppressing hot spots inside the reactor by effectively controlling the flow of the gas in the combustion zone and the chlorination zone of the catalyst regenerator do.

It is another object of the present invention to solve the problem caused by catalyst clogging during catalyst regeneration because the gas circulation is the same as the catalyst flow from the upper part to the lower part in the combustion zone having a high coke content in the catalyst, To easily remove remaining coke, and to improve the efficiency and stability of the catalyst regeneration process by suppressing occurrence of hot spot due to good air dispersion in the chlorination zone.

One aspect of the present invention for achieving the above object is a regeneration apparatus for regenerating catalyst particles,

A deactivation device for removing catalyst residues and contaminants from the catalyst supplied from the dehydrogenation zone;

Wherein the main body comprises at least one feed gas inlet tube and a discharge tube for discharging the regenerated catalyst, wherein the catalyst is continuously passed through the combustion zone, the chlorination zone and the drying zone into the mobile phase And the main body includes an annular disc type combustion zone.

The combustion zone is provided with a screen dispersing plate for dispersing and injecting a supply gas into the center of the reactor so that the supply gas is injected through the screen dispersing plate.

The combustion zone and the chlorination zone are constructed in an annular disc shape, the catalyst bed is flowed in an annular space defined by two coaxial cylindrical walls, the gas is introduced via one wall, To be discharged via the pipe.

In the catalyst regenerating apparatus of the present invention, the catalyst is passed between the combustion zone and the chlorination zone, and the barrier layer is impermeable to the gas, so that the gas circulation manner of the combustion zone and the chlorination zone are different from each other.

According to various embodiments of the present invention, the flow regime of the combustion zone and the chlorination zone in the catalyst regenerator can be effectively controlled to suppress the hot spot inside the reactor, thereby minimizing the catalyst damage and improving the productivity of the catalyst regeneration process have.

In addition, according to the present invention, the gas circulation in the combustion zone having a high coke content in the catalyst is the same as the flow of the catalyst in the downward direction from the top, thereby preventing problems caused by catalyst clogging during catalyst regeneration.

According to the present invention, it is possible to smoothly disperse the gas in the drying zone so that the remaining amount of the coke can be easily removed, and the air can be well dispersed in the chlorination zone, thereby suppressing occurrence of hot spot.

Further, in the catalyst regenerating apparatus of the present invention, clogging of the catalyst at the lower end of the catalyst regenerating apparatus can be prevented in advance.

1 is a schematic view of a conventional catalyst regeneration apparatus.
2 is a schematic diagram of an apparatus for regenerating a catalyst according to an exemplary embodiment of the present invention.
3 is a schematic diagram of an apparatus for regenerating catalyst particles according to another exemplary embodiment of the present invention.
4 to 5 are schematic views of a catalyst regenerating apparatus according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The embodiments of the present invention are shown by way of example and are not limited to the features of the accompanying drawings. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. In the following, similar components will be described using similar reference numerals.

As used herein, the term " zone "refers to a specific area within a catalyst regenerator that includes at least one device or sub-zone, and the body of the catalyst regenerator in the present invention may include one or more zones And may include sub-zones.

2 is a schematic diagram of an apparatus for regenerating a catalyst according to an exemplary embodiment of the present invention. Referring to FIG. 2, a catalyst regeneration apparatus according to an embodiment of the present invention includes a cancellation device 1 for removing catalyst residues and contaminants from a catalyst supplied from a dehydrogenation zone; And a main body formed integrally with the break-in and put-in apparatus (1). The body comprises at least one feed gas inlet pipe (3, 6, 7) and a discharge pipe (8) for discharging the regenerated catalyst, the catalyst continuously passing through the combustion zone, the chlorination zone and the drying zone, The body includes annular disc shaped combustion zones (10, 10 ') arranged in series.

The combustion zone may be provided with a screen dispersing plate 11 for dispersing the feed gas into the center of the reactor so that the feed gas is injected through the screen dispersing plate. The screen dispersing plate 11 is a donut-shaped plate-like structure including a plurality of orifices.

The screen dispersing plate 11 is present in the combustion zones 10 and 10 'at the positions of the gas introduction part and the exhaust part to perform the function of dispersing the gas in the combustion zones 10 and 10'.

In the catalyst regenerating apparatus of the present invention, the combustion zone and the chlorination zone are formed in an annular disc shape, and the catalyst bed is flowed in an annular space defined by two coaxial cylindrical walls, and the gas is introduced via one wall , And is discharged via the opposite wall. After passing through the combustion zone 10, 10 ', the gas is discharged from the combustion zone via the gas discharge pipe 4.

The combustion zone is provided with one or more conduits 2 for introducing an inert gas into the combustion zone 10 or 10 'for the purpose of transporting the catalyst between the combustion chamber 1 and the combustion zone 10, 10' One or more gas discharge pipes (4) for discharging gas from the zones (10, 10 ') are connected in the middle of the combustion zone. Therefore, in the combustion zones 10 and 10 ', the gas circulation is the same as the catalyst flow from the upper part to the lower part, thereby preventing the problem caused by the catalyst clogging in the catalyst regeneration.

According to the present invention, the combustion zones 10 and 10 'are physically separated so as to pass the catalyst, but not the gas from the top to the bottom. By separately managing the gases in each combustion zone, the inlet and outlet gas temperatures and their oxygen content can be accurately known at any time. In addition to maximum oxygen use, this management can control the coking combustion by adjusting the operating conditions within each zone.

After combustion, a catalyst having a reduced content of carbon-containing material passes through the conduit 12 and reaches the chlorination zone 20, 20 '. Thereafter, it flows into the drying zone 30 and is discharged from the main body via the conduit 8.

Between the combustion zone 10, 10 'and the chlorination zone 20, 20' a plate or any other blocking plate 14 is arranged to pass the catalyst but not the gas. Conversely, the gas is freely circulated from the drying zone 30 to the chlorination zone 20, 20 '.

One or more conduits (6) for introducing a chlorinating agent into the chlorination zone and one or more conduits (6) upstream of the chlorination zone, which are located in the middle of the chlorination zone in the chlorination zone (20, 20 ' The conduit 5 is connected so that the circulation of the gas takes place from the lower to the upper direction. Thus, the gas circulation manner of the combustion zone 10, 10 'and the chlorination zone 20, 20' is configured to be different from each other.

The chlorination zone 20, 20 'is supplied with at least one chlorinating agent, at least one oxygen-containing gas or water. The chlorinating agent may be chlorine, HCl, or chlorinated hydrocarbons (e.g., carbon tetrachloride) containing less than 12 carbon atoms and 1 to 6 chlorine atoms or any chlorinating agent known to release chlorine in such a regeneration process. It is preferable to introduce an oxygen-containing gas. If the chlorination zone is in the axial direction, it is advantageous to introduce it into the lower part of the chlorination zone so as to flow countercurrently to the catalyst.

In the chlorination zone 20, 20 ', the catalyst is contacted with the introduced gas and also comes into contact with the gas from the drying zone 30, recharges the charged oxygen and contains a small amount of water from the drying step.

The screen dispersing plate 11 may include means 11 'in which the horizontal cross-sectional area of the combustion zone 10, 10' extends toward the lower end of the body to control the flow rate of the catalyst.

In addition, the catalyst regeneration apparatus according to an embodiment of the present invention may further include a triangular-pyramid type auxiliary plate 35 for allowing the regenerated catalyst particles to be discharged smoothly without stagnation at the lower end of the main body.

The drying zone 30 may include one or more means for cooling the gas, one or more means for treating the gas to remove impurities, one or more means for drying the gas, and one or more means for compressing the gas .

Hereinafter, the operation of the catalyst regenerating apparatus of the present invention will be described.

Referring to Figure 2, a stream containing spent catalyst particles comprising coke deposits is provided. In order to maintain or restore the catalytic activity of the spent catalyst particles, the spent catalyst particles must be regenerated, i.e. almost all of the coke must be removed from the spent catalyst particles.

 The removal of the coke from the spent catalyst particles is effected by combustion in the combustion zone 10, 10 'of the apparatus 100. As shown, the combustion zones 10, 10 'include a first combustion zone 10 and a second combustion zone 10'. The stream of spent catalyst particles is first introduced into the combustion zone 10, 10 '. In the combustion zone 10, 10 ', the coke is burned on the spent catalyst particles.

As shown, the apparatus 100 also has one or more inlets 2 for supplying combustion gases containing oxygen to the combustion zones 10, 10 '. In order to control the combustion of the coke in the combustion zone 10, 10 ', the oxygen content of the environment in the combustion gas and combustion zone is tightly controlled.

The spent catalyst particles can be regarded as catalyst particles since they exit the combustion zone 10, 10 'after coke combustion. The catalyst particles migrate down the device 100 from the combustion zone 10, 10 'via the conduit 12 to the chlorination zone 20, 20'. The chlorinated gas is fed into the chlorination zone 20, 20 'through at least one inlet 6. The chlorinated gas includes a halogen-containing gas such as chlorine and an oxygen-containing gas such as air or water. 2, a single inlet 6 is illustrated as feeding a combined stream of a halogen-containing gas and an oxygen-containing gas to the chlorination zone 20, 20 ', although a separate inlet may be used to separate the gases For example.

The presence of a halogen-containing gas and an oxygen-containing gas in the chlorination zone 20, 20 'is supplied for chlorination of the catalyst particles. Chlorination is essential because the platinum group metals in the catalyst particles experience aggregation at high temperatures encountered during processing. The aggregated platinum group metal on the catalyst particles is redispersed for better catalytic activity than the chlorination reaction.

The catalyst particles after chlorination can be regarded as chlorinated catalyst particles. The chlorinated catalyst particles are directed from the chlorination zone 20, 20 'to the drying zone 30 in the apparatus 100. In the steady state mode, the heated dry gas is supplied to the drying zone 30 through at least one inlet 7. The dry gas may comprise an oxygen containing gas such as an inert gas, a halogen containing gas and / or air. In the drying zone 30, the drying gas is vented through the catalyst particles to remove water due to the upstream reaction.

2, a single inlet 7 shows an exemplary embodiment for supplying a combined stream of different gases to the drying zone 30, but a separate inlet is provided for separate transport of the various gases .

In one embodiment of the present invention, the drying zone 30 is in fluid communication with the chlorination zone 20, 20 'so that the gas required for the chlorination zone 20, 20' flows through the drying zone 30 into the inlet 58 Lt; RTI ID = 0.0 > chlorination < / RTI > The gas from the chlorination zone 20, 20 'can be removed from the apparatus 100 via conduit 5.

2, the regenerated catalyst particles may exit the apparatus 100 after passing through the drying zone 30 and may be fed back to the catalytic reforming system or another catalytic system and the combustion zone 10, 10 ' ) ≪ / RTI > of the spent catalyst particles.

 Figs. 3 to 5 show a catalyst regeneration apparatus according to another embodiment of the present invention. The catalyst regeneration apparatus according to another embodiment of the present invention shown in FIG. 3 comprises a circular plate-shaped or screen-shaped dispersion (dispersing) functioning in front of a gas discharge pipe 4 serving as a gas discharge in the combustion zone 10, 10 ' And a plate 11.

The catalyst regeneration apparatus of another embodiment of the present invention shown in FIG. 4 has a structure in which the structure of the dispersion plate 11 is extended from the upper end to the lower end in the front end of the gas discharge pipe 4 in the combustion zone 10, 10 ' 4 are directly connected to the dispersion plate 11.

An inert gas is injected into the inert purge inlet 9 connected to the combustion zones 10 and 10 'in FIG. 4 to regenerate the gas through the internal inlet pipe 15 and through the combustion zones 10 and 10' Air impurities are removed before operation in the reactor to regulate the oxygen concentration in the catalytic combustion zones 10 and 10 '.

The catalyst regeneration apparatus of another embodiment of the present invention shown in Fig. 5 further comprises an exhaust gas collecting device 40 between the combustion zone and the chlorination zone for collecting the exhaust gas discharged from the chlorination zone 20, 20 ' It is possible to effectively remove the exhaust gas to suppress the regeneration reactor corrosion.

While at least one exemplary embodiment has been presented in the foregoing detailed description of the invention, it should be understood that there are many variations. It is also to be understood that the exemplary embodiments or exemplary embodiments are merely examples, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the foregoing detailed description will provide those skilled in the art with a convenient guidance for implementing the exemplary embodiments of the invention, and without departing from the scope of the invention and its legal equivalents as set forth in the appended claims, It will be understood that various modifications may be made in the function and construction of the elements described in the foregoing description.

1: Discharging device 4: Gas discharge pipe
10, 10 ': combustion zone 11: screen diffuser plate
20, 20 ': chlorination zone 30: drying zone

Claims (10)

A regeneration device for regenerating catalyst particles, wherein the regeneration device
A deactivation device for removing catalyst residues and contaminants from the catalyst supplied from the dehydrogenation zone;
Wherein the main body comprises at least one feed gas inlet tube and a discharge tube for discharging the regenerated catalyst, wherein the catalyst is continuously passed through the combustion zone, the chlorination zone and the drying zone into the mobile phase Said body comprising an annular disc shaped combustion zone,
Wherein the combustion zone is provided with a gas introduction part for injecting a supply gas into the center of the reactor and a screen dispersion plate at a position of the gas discharge part so that the supply gas is injected and discharged through the screen dispersion plate.
delete The apparatus of claim 1, wherein the combustion zone and the chlorination zone are configured in an annular disc shape and the catalyst bed is configured to flow in an annular space defined by two coaxial cylindrical walls.
The catalyst regenerating apparatus according to claim 1, wherein a catalyst layer is provided between the combustion zone and the chlorination zone in the catalyst regenerating apparatus, and a barrier layer is provided so as to be impermeable to gas, so that the gas circulation manner of the combustion zone and the chlorination zone are different from each other Wherein the catalyst regeneration apparatus comprises:
2. The apparatus of claim 1, wherein the catalyst regenerator further comprises at least one conduit for introducing an oxygen-containing gas into the combustion zone, the at least one conduit being disposed between the bottom of the rejection injector and the combustion zone, Is formed in the middle of the combustion zone so that the gas circulation in the combustion zone is made from the upper direction to the lower direction.
The method of claim 1, wherein the chlorination zone of the body is provided in the middle of the chlorination zone, the at least one conduit for introducing the chlorination agent into the chlorination zone, and the at least one conduit, upstream of the chlorination zone, Wherein at least one conduit is connected so that circulation of the gas is made in the direction from the bottom to the top.
2. The catalyst regeneration apparatus of claim 1, wherein the screen dispersing plate includes means for expanding the horizontal cross-sectional area of the combustion zone toward the lower end of the body to control the flow rate of the catalyst.
The catalyst regenerating apparatus according to claim 1, wherein the catalyst regenerating apparatus further comprises a triangular-pyramidal auxiliary plate for allowing the regenerated catalyst particles to be discharged smoothly without stagnation at the lower end of the main body.
The method of claim 1, wherein the drying zone comprises one or more means for cooling the gas, one or more means for treating the gas to remove impurities, one or more means for drying the gas, Wherein the catalyst regeneration means includes a catalyst regeneration means.
The catalyst regenerating apparatus according to claim 1, wherein the screen dispersing plate is a donut-shaped plate-like structure including a plurality of orifices.

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