JPH04363151A - Separation of catalyst and catalyst separator - Google Patents

Abstract

PURPOSE:To remove catalyst particles from the slurry oil of a fluidized catalytic cracking device with high efficiency and decrease the bulk of separated catalysts by supplying the slurry oil into a horizontal type chamber, maintaining the inside of this horizontal type chamber at a high temp. state and subjecting the catalyst particles in the slurry oil to a gravity settling sepn. CONSTITUTION:The slurry oil of the fluidized catalytic cracking device is supplied from a supply port 11 into the horizontal type chamber 1 and the high temp. state is maintained in the horizontal type chamber 1. The catalyst particles in the slurry oil are then subjected to the gravity settling sepn. Consequently, the catalyst particles are removed from the slurry oil with the high efficiency and the bulk of the separated catalysts is decreased. In addition, initial costs, running costs, etc., are low and the economical catalyst separating means is obtd.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst separation method and a catalyst separation apparatus.

0002

BACKGROUND OF THE INVENTION Fluid catalytic cracking units are increasingly used in petroleum refineries as equipment for producing light oils such as gasoline and kerosene from heavy oils such as heavy oil.

[0003] Fluid catalytic cracking equipment decomposes heavy oil by bringing the catalyst particles into contact with heavy oil in a fluidized bed in which catalyst particles mainly composed of amorphous silica alumina or zeolite of 10 to 80 μm are suspended. do.

As a result, hydrogen, methane, ethane, ethylene, propane, propylene, butane, butylene, gasoline, kerosene, light oil, and slurry oil are produced.

[0005] Slurry oil contains 1,000 to 2,000 ppm of catalyst fine particles with a diameter of about 10 μm, so when a mixed oil of slurry oil and heavy oil is used as a marine engine fuel, the amount of catalyst particles present in the slurry oil must be reduced. There are concerns that the catalyst particles may cause adverse effects such as friction on piston rings.

[0006]Therefore, there is a need for efficient separation of catalyst fine particles from slurry oil.

Generally, in order to remove catalyst fine particles from slurry oil, a settler 21 is usually used as shown in FIG.
Then, the slurry oil supplied from the slurry oil supply passage 21a and the recycled oil supplied from the recycled oil supply passage 21b are mixed, and the extracted oil containing many catalyst particles is taken out from the slurry oil extraction passage 21c at the lower part of the settler and recycled again. The slurry oil is returned to the reaction tower, and on the other hand, the slurry oil from which catalyst fine particles have been removed is taken out from the recycled oil take-out passage 21d in the upper part of the settler.

However, this operation alone cannot completely remove the catalyst particles from the slurry oil;
0 to 2000 ppm remains.

[0009] Therefore, in order to further remove catalyst particles from the slurry oil taken out from the upper part of the settler,
Various catalyst separation means have been proposed.

For example, hydrocyclone, centrifugal separator, various filters (etched desk, wire mesh, pre-coated with diatomaceous earth, etc.), electrocoagulation separation, and precipitation separation using a flocculant using a slurry oil storage tank. etc.

In FIG. 2, 22 indicates a gravity settling tank, and 23 indicates a heat exchanger.

0012

[Problems to be Solved by the Invention] However, among the above-mentioned various catalyst separation means, those that are effective for catalyst separation generally have expensive equipment, high operating costs, or Each type has its own advantages and disadvantages, as there are processing problems such as bulkiness.

[0013] In addition, the conventional gravity sedimentation method using a flocculant in a storage tank requires chemicals and a large tank, which is costly, and furthermore, the removal rate is low because it is difficult to remove fine particles. .

The object of the present invention is to be able to remove catalyst fine particles from slurry oil with high efficiency, to reduce the bulk of the separated catalyst, and to reduce equipment costs, operating costs, etc. The object of the present invention is to provide an economical catalyst separation means.

[0015]

[Means for Solving the Problems] The means for solving the problems of the present invention are as follows.

First, the slurry oil of the fluid catalytic cracking apparatus is supplied into a horizontal tank, and the inside of the horizontal tank is maintained at a high temperature.
This is a catalyst separation method in which fine catalyst particles in slurry oil are separated by gravity sedimentation.

Second, the slurry oil of the fluid catalytic cracking apparatus is supplied into a horizontal tank, the temperature of the slurry oil in the horizontal tank is maintained at 200° C. or higher, the residence time is set to 5 hours or more, and the slurry oil in the slurry oil is This is a catalyst separation method in which fine catalyst particles are separated by gravity sedimentation.

Thirdly, the overall shape is horizontal and has a high temperature maintenance mechanism, an inlet nozzle connected to the slurry oil supply path of the fluid catalytic cracker is provided on the side, and a baffle plate is provided in front of the inlet nozzle. This is the installed catalyst separation equipment.

[0019]

[Operation] According to the present invention, slurry oil containing catalyst fine particles is supplied from a fluid catalytic cracking device into a horizontal tank, and the catalyst fine particles are separated from the slurry oil by gravity sedimentation separation in the horizontal tank.

[0020] Here, it is known that gravitational sedimentation follows the Stokes equation shown in Equation 1.

[0021]

[Formula 1]

[0022] The temperature change in the specific gravity of a liquid is much larger than that of a solid, and the higher the temperature, the lower the viscosity of the liquid, so according to Stokes' equation, the higher the temperature, the higher the catalyst sedimentation rate.

[0023] Therefore, it is desirable to carry out solid-liquid sedimentation separation at as high a temperature as possible.

[0024] Conventionally, it has not been done if slurry oil is allowed to remain in a tank for a long time at high temperatures, as there is a risk that thermal decomposition will proceed and coke will precipitate, clogging the equipment. Accordingly, coke precipitation is a function of temperature and residence time, but at high temperature conditions, e.g.
It has been found that at a certain temperature, even if the temperature is kept for a long time, coke precipitation does not become a problem, and catalyst fine particles can be effectively separated without any problems such as clogging of the apparatus.

Therefore, according to the present invention, since the horizontal tank is maintained at a high temperature, coke does not precipitate, and catalyst fine particles are effectively separated.

Furthermore, by using a horizontal tank, the fluid inlet velocity is reduced to suppress fluid turbulence as much as possible, and collisions between the sedimentation flow of the catalyst and the slurry oil are reduced compared to a vertical tank.

The residence time of slurry oil in the horizontal tank is 5
The duration is at least 10 hours, preferably at least 10 hours.

[0028] Here, since the horizontal tank is large in order to ensure residence time, the work of removing precipitated catalyst fine particles can be completed by cleaning about once a year.

[0029]

(1) Example An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic side view of a catalyst separation apparatus according to the present invention.

[0031] The catalyst separation device according to the present invention will be explained.

[0032] In this device, an inlet nozzle 12 is attached to a supply port 11 for slurry oil supplied from the fluid catalytic cracking device, and an outlet 13 for slurry oil is attached to the upper surface on the opposite side from the supply port 11. It consists of a horizontal tank 1.

[0033] The tank 1 is provided with a mechanism (not shown) that can maintain the temperature of the supplied slurry oil using, for example, a heat insulating material.

Further, a baffle plate 12a is attached in front of the inlet nozzle 12 attached to the supply port 11 so as to block the blowing direction of the slurry oil.

In FIG. 1, 14 and 15 are openings for cleaning the inside of the tank 1.

(2) Test Example The slurry oil was distributed into a horizontal test tank of about 3 m3, and the temperature conditions were kept the same, and the supply amount and residence time of the slurry oil were set in four ways (Test Example No. 1 to No. 4)
The changes in the catalyst removal rate were investigated, and the results are shown in Table 1.
It was shown to.

[0037]

[Table 1]

(3) Comparative Example Slurry oil was divided into a comparative tank of about 3 m3,
At the same temperature as in the test example, we changed the tank type, presence or absence of baffle plates, slurry oil supply amount, and residence time in four different combinations (test example No. 1 to No. 4) to observe changes in catalyst removal rate, etc. The results are shown in Table 2.

[0039]

[Table 2]

By comparing the results of the comparative example and the test example, it can be confirmed that the horizontal tank type and the one with a baffle plate gave better results.

[0041]

Effects of the Invention The catalyst particle removal means of the present invention has a simple structure, can remove catalyst particles from slurry oil with high efficiency, can reduce the bulk of the separated catalyst, and is easy to use with equipment. It is economical, with low operating costs and low costs.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a catalyst separation device according to the present invention.

FIG. 2 is a schematic explanatory diagram of a settler.

[Explanation of symbols]

1 tank 11 Supply port 12 Inlet nozzle 12a Baffle board 13 Exit 14 Opening hole 15 Opening hole 21 Settler 21a Slurry oil supply path 21b Recycled oil supply path 21c Slurry oil extraction path 21d Recycling oil extraction path 22 Gravity settling tank 23 Heat exchanger

Claims (3)

[Claims] 1. A catalyst separation method, which comprises supplying slurry oil of a fluid catalytic cracking apparatus into a horizontal tank, maintaining the interior of the horizontal tank at a high temperature, and separating catalyst fine particles in the slurry oil by gravity sedimentation. 2. The slurry oil of the fluid catalytic cracking device is supplied into a horizontal tank, the temperature of the slurry oil in the horizontal tank is maintained at 200° C. or higher, and the residence time is set to 5 hours or more, so that the catalyst fine particles in the slurry oil are A catalytic separation method characterized by gravity sedimentation separation. Claim 3: The overall shape is horizontal and has a high temperature maintenance mechanism, an inlet nozzle connected to a slurry oil supply path of a fluid catalytic cracker is provided on the side, and a baffle plate is installed in front of the inlet nozzle. Catalyst separation equipment.