EA016208B1 - Multiple loop reactor for olefin polymerization - Google Patents

Abstract

The present invention provides a multiple loop reactor for the production of ethylene homopolymerization and ethylene copolymerization and higher 1-olefin copolymers. Reactor 1 comprises two loop reactors 2 and 3 extended substantially in the same horizontal plane and interconnected by a transfer line 16 for transferring polymer slurry from a reactor to another reactor extending from the exit of a vertical settling leg of the first reactor to the entry in the other reactor and extended substantially horizontally. A method is also proposed for the oproduction of said ethylene polymers.

Description

Technical field

The present invention relates to an improvement in transporting a polymer suspension from one olefin polymerization loop reactor to another olefin polymerization loop reactor in a multi-loop reactor. More specifically, the present invention relates to a multi-loop reactor suitable for carrying out the polymerization of olefins and comprising at least two loop reactors connected to each other, as well as to a method for the polymerization of olefins in which a polymer suspension is transported essentially horizontally from one loop reactor to another loop reactor through transfer pipelines.

State of the art

The polymerization of olefins, for example the polymerization of ethylene, is often carried out in a reactor using a monomer, diluent, catalyst, and possibly comonomers and hydrogen. The polymerization is usually carried out in suspension, in which the product usually consists of solid particles and is in the form of a suspension in a diluent. The suspension contents of the reactor are continuously circulated by pumping it to maintain effective suspension of polymer solid particles in a liquid diluent. The product is recovered using vertical sedimentation tanks, which operate in batch mode to select the product. Sedimentation in sedimentation tanks is used to increase the concentration of solids in the suspension, which is ultimately recovered as a product suspension. Then the product is discharged into the evaporation tank through evaporation pipelines, where most of the diluent and unreacted monomers are evaporated, which are recycled. The polymer particles are dried, then additives can be added to them, and finally, the polymer is extruded and granulated.

As is known in the art, for the polymerization of olefins, several series-connected reactors can be used to produce polyolefins. Some polymerization processes include the use of two or more polymerization reactors connected to each other. The term bimodal olefin polymer refers to an olefin polymer, which is obtained in two reactors connected in series with each other. However, problems associated with known polymerization methods and plants consisting of a polymerization system comprising two or more series-connected reaction vessels for polymerization include a violation of the transport of a polymer suspension from one reactor to another series-connected reactor, provided that each reactor has independently selected operating conditions . In some cases, smaller particles (fines) are formed during transport, which tend to hang or remain in the transport equipment and may even clog pipelines and valves. Frequent clogging of the system causes equipment shutdowns, loss of product and raw materials, and also increases operating costs.

Systems known in the art have described interconnected reactors arranged substantially vertically, i.e. reactors located one above the other in the vertical direction at an angle of inclination above 45 ° with respect to the horizontal axis drawn from the outlet of the first reactor. This arrangement requires the installation of vertical transfer pipelines or other means of vertical transportation of the polymer product from the polymerization zone of the first reactor to the polymerization zone of the second reactor. However, the problem associated with this type of configuration is the need for vertical arrangement of reactors, which usually has technical limitations and leads to an increase in production costs. In addition, in this configuration, the reactors are located close to each other, which limits access to them.

US Pat. No. 3,344,443, describes an apparatus for copolymerizing mono-1-olefins. The installation includes two reactors connected to each other. The polymer product is transported from the first reactor to the second reactor by transporting the polymer product into a screw conveyor, which transfers the polymer product from the first reactor to the wash column of the second reactor. A screw conveyor is a conveyor comprising a trough or pipe in which the product moves under the action of an endless screw or blades. Thus, to transport a polymer product from one reactor to another reactor, a mechanical device driven by an engine is used in the apparatus described in US Pat. No. 3,345,431.

In view of the foregoing, in the art there is a need to develop a method and system of polymerization reactors in which the operational problems existing in multi-reactor systems of a known type are solved, and in which the installation can be built and operate more economically than known systems.

Thus, the main objective of the present invention is to develop a system of several interconnected reactors, which are created and operate more economically than multiple reactors known in the art. The present invention is also the development of an improved method for the preparation of polyolefins in general, and polyethylene in particular, in a system of several reactors connected to each other. In addition, the present invention is the development of an improved method in which several reactors connected to each other are used and which allows to reduce structural and operational costs and

- 1 016208 to improve the performance and operational versatility of the reactor system.

SUMMARY OF THE INVENTION

In a first aspect, the present invention relates to a reactor suitable for the polymerization of olefins, namely the homopolymerization of ethylene or the copolymerization of ethylene and higher 1-olefin comonomers, including butene, 1-pentene, 1-hexene, 1-octene or 1-decene, and comprising at least two reactors connected to each other, said compound essentially consisting of one or more transfer pipelines suitable for transporting a polymer suspension from one reactor to another reactor, wherein the transmission pipe is arranged essentially horizontally.

According to the present invention, at least two reactors are connected to each other and preferably connected in series so that the polymer product produced in one reactor can be sent to another polymerization reactor for further polymerization in this reactor. In accordance with the present invention, two reactors are located essentially in the same horizontal plane, which allows direct, essentially horizontal, transportation of the polymer product from one polymerization reactor to another polymerization reactor. For this purpose, product transfer pipelines, allowing the polymer product to be transported from one reactor to another reactor, are arranged substantially horizontally.

The reactors are located essentially in the same horizontal plane, so that the vertical distance ΔΗ from the outlet of the vertical sump of the first reactor to the inlet of the second reactor is less than the horizontal distance ΔΕ from the outlet of the vertical sump of the first reactor to the inlet of the second reactor . A transfer pipe connects the outlet of a vertical reactor sump to the inlet of another reactor.

The transfer pipe is arranged essentially horizontally at an angle of inclination α to the horizontal axis X-X ', comprising 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 °.

In another aspect, the present invention relates to a method for preparing in the proposed reactor the above olefin polymers, comprising the following operations:

introducing into the reactor one or more olefin reactants (ethylene or ethylene and the above 1-olefin comonomer), polymerization catalysts and diluents;

polymerizing said olefin reactants to form a polymer suspension;

pumping said polymer suspension to maintain circulation in said reactor, said method further comprising one or more of the following cycles: after deposition of said polymer suspension in one or more vertical settling tanks of the first reactor, substantially horizontal transportation of said polymer suspension from the outlet of the vertical settling tank the first reactor into the inlet of the second reactor through the specified transfer pipe at an angle α to the horizontal axis X-X ', comprising 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 °.

Compared with the known reactors and methods, the reactor and method proposed in accordance with the present invention have several advantages, for example, cost-optimal transportation of the precipitated slurry from the vertical settling tanks of one reactor to another reactor.

Due to the essentially horizontal arrangement of the transfer pipelines between the reactors connected to each other, the two reactors can be located essentially in the same horizontal plane, which simplifies the installation of reactors: the reactors can be located at a greater distance from each other than in the case of vertically arranged reactors. In addition, the horizontal alignment of the reactors allows to reduce structural and operating costs, as well as facilitates access to each individual reactor, which is very important both from a technical point of view and from a safety point of view.

Unexpectedly, it turned out that the essentially horizontal transportation of the polymer product from one reactor to another by means of transfer pipelines does not increase the clogging frequency of the pipelines transporting the polymer, but provides optimal transportation of the product in terms of cost.

The present invention will now be described in more detail. The description is given here as an example, but does not limit the present invention. Numerical designations refer to the drawings attached to the description.

Detailed Description of Drawings

In FIG. 1 schematically shows two polymerization reactors 2, 3 connected in series in accordance with the present invention;

in FIG. 2 shows a detailed connection diagram of a loop reactor 2 with another loop reactor 3 by means of transfer pipelines 16;

in FIG. 3 schematically shows a dual-loop polymerization reactor.

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DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to an apparatus and method for substantially horizontal transporting a polymer suspension from one reactor to another reactor in a multi-reactor system.

The following detailed description is given as an example of a multi-loop reactor consisting of at least two loop reactors connected in series. However, the present invention is not limited to loop reactors and is also suitable for any other type of multi-vessel reactors consisting of at least two reactors connected in series.

The present invention is suitable for the implementation of polymerization methods carried out in loop reactors to obtain olefin polymers, and these methods consist of catalytic polymerization in a diluent containing a polymerizable monomer of olefins such as C ₂ -C ₈ olefins, namely ethylene or ethylene and higher 1-olefin comonomers, which are butene, 1-pentene, 1-hexene, 1-octene or 1-decene.

The polymerization reaction can be carried out at a temperature of from 50 to 120 ° C, preferably at a temperature of from 70 to 115 ° C, more preferably at a temperature of from 80 to 110 ° C and at a pressure of from 20 to 100 bar (2-10 MPa), preferably at a pressure of 30 to 50 bar (3-5 MPa), more preferably at a pressure of 37 to 45 bar (3.7-4.5 MPa).

In particular, the present invention is described by the example of ethylene polymerization. Suitable ethylene polymerization processes include homopolymerization of ethylene and copolymerization of ethylene and higher 1-olefin comonomers such as butene, 1-pentene, 1-hexene, 1-octene or 1-decene. More specifically, the invention is described by the example of ethylene polymerization to produce bimodal polyethylene (PE). The term bimodal PE refers to PE obtained in two reactors connected in series with each other.

The polymerization of ethylene is carried out in a liquid diluent in the presence of a catalyst, possibly a cocatalyst, possibly a comonomer, possibly hydrogen, and possibly other additives, resulting in a suspension of the polymer.

Used in the present description, the terms polymerization suspension or suspension of a polymer or suspension means essentially a multiphase composition comprising at least solid polymer particles and a liquid phase, as well as allowing at least a local presence in the process of the third phase (gas) while the liquid phase is a continuous phase. Solids include a catalyst and a polymerized olefin, such as polyethylene. Liquids include an inert diluent such as isobutane, a dissolved monomer such as ethylene, a comonomer, molecular weight regulators such as hydrogen, antistatic agents, antifouling agents, cleaners and other processing aids.

Suitable diluents are known in the art and include hydrocarbons that are inert or at least substantially inert and in a liquid state under the reaction conditions. Suitable hydrocarbons include isobutane, n-butane, propane, n-pentane, isopentane, neopentane, isohexane and n-hexane; a preferred hydrocarbon is isobutane.

Suitable catalysts are well known in the art. Non-limiting examples of suitable catalysts include chromium oxide, for example, supported on silica or alumina, organometallic catalysts, including those known as Ziegler or Ziegler-Natta catalysts, metallocene catalysts and the like. The term co-catalyst used in the present description refers to materials that can be used together with the catalyst to increase the activity of the latter in the polymerization reaction.

In a first embodiment, the present invention relates to a multi-loop reactor suitable for polymerizing polyolefins and comprising at least two loop reactors connected to one another, said compound essentially consisting of one or more transfer pipelines suitable for transporting a polymer suspension from one reactor into another reactor, and wherein said transfer pipe is arranged substantially horizontally. In FIG. 1 shows a multi-loop reactor 1, comprising at least two polymerization reactors 2, 3, connected in series in accordance with the present invention. Although in a preferred embodiment the invention includes the use of two separate loop reactors, those skilled in the art will appreciate that the invention can also be carried out using more than two separate reactors.

Two reactors 2, 3 can operate sequentially, simultaneously producing the same or different polymer products, depending on the selected feedstock, to produce polyolefins and a catalyst, temperature, pressure and other conditions inside the reactors. In a preferred embodiment of the apparatus and method of the present invention, the reactors are operated sequentially such that the polymer product produced in one reactor is transported to another reactor for further polymerization there.

- 3 016208

The properties of the final polyolefin product obtained in a multi-loop reactor depend on a large number of factors that can be individually adjusted in a system of at least two loop reactors, including the composition of the fluidizing medium in each loop reactor, polymerization catalysts, temperature and pressure, speed flow and other parameters supported in reactors. Thus, the polymerization system proposed in the present invention, including the specified multi-loop reactor 1, has operational flexibility, which allows to obtain polyolefin polymers having different physical properties. In a preferred embodiment, loop reactors of a multi-loop reactor system are connected in series and used to prepare a sequentially polymerized product having specific characteristics.

As shown in FIG. 1, a multi-loop reactor includes at least two loop reactors 2, 3 connected to each other, each of which consists of a plurality of interconnected pipes 4, which determine the flow path 8 of the polymer suspension. In addition, one or more vertical sumps 12 are connected to the pipes 4 of one of the reactors, reactor 2. Each of these vertical sumps 12 is connected to a transfer pipe 16 for transporting the polymer slurry to another reactor 3. One or more vertical sumps 12 are also attached to pipes 4 of another reactor 3 to discharge the polymer suspension from the reactor 3 into the product separation zone. In addition, at least one pump 6, suitable for maintaining the circulation of the polymer suspension, is installed in said multi-loop reactor. The connection between the loop reactors 2, 3 essentially consists of one or more transfer pipelines 16, said transfer pipelines being directed essentially horizontally from one reactor 2 to another reactor 3. The transfer pipelines are directed essentially horizontally at an angle of inclination α to the horizontal axis X-X ', comprising 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 °.

Each loop reactor 2, 3 consists of a plurality of interconnected pipes 4, such as a plurality of vertical pipe segments, a plurality of upper transverse pipe segments, a plurality of lower transverse pipe segments, the upper end of each of said vertical pipe segments being connected to one of said upper transverse pipe segments and the lower end of each of these vertical pipe segments is connected to one of these lower transverse pipe segments using angular connecting segments, which ensures Roughness of the flow path 8 of the polymer suspension. It should be understood that although the design of the illustrated loop reactors 2 and 3 includes four vertical pipes, these loop reactors 2, 3 may be provided with more or fewer pipes, in particular 4 or more pipes, for example from 4 to 20 vertical pipes. The vertical sections of the pipe segments are preferably provided with heat-exchange jackets 10. The heat generated by the polymerization can be removed using cooling water circulating in said jacket of the reactor. Preferably, said reactors operate in a fully liquid mode.

Reagents, including monomeric ethylene, a light hydrocarbon diluent, and possibly comonomer and hydrogen, are introduced into the reactor 2 via line 5. At least one reactor 2 is also fed via line 11 to the catalyst, possibly together with a cocatalyst or activating agent.

In loop reactors, the polymer suspension is circulated. The polymerization slurry directly circulates through loop reactors 2, 3, as shown by arrows 8, under the action of one or more pumps, such as an axial pump 6. The pump can be driven by an electric motor 7. The term pump as used in this description includes any device that, using a compression drive increases the pressure of the liquid, for example, by means of a piston or a set of rotating impellers 9. In accordance with the present invention, an axial type pump is preferably selected.

In a preferred embodiment, the catalysts are introduced in front of the pump 6 via line 5, while the diluent, monomer, possible comonomers and additives are preferably introduced after the circulation pump 6 through line 11.

Each of the loop reactors 2, 3, in addition, is equipped with one or more vertical sumps 12 connected to the pipes 4 of the reactors 2, 3. The suspension of the intermediate polymer or polymer product can be removed from the loop reactors by periodic or continuous discharge through one or more vertical sedimentation tanks 10 along with some diluent. In vertical settling tanks 12, the solids content will increase compared to its concentration in the volume of the loop reactor. As shown in FIG. 1, the polymer slurry deposited in the vertical settling tanks 12 can be removed via a three-way valve 15 and then either directed to another reactor 3 using a transfer line 16 or directed to a product recovery zone, for example, via a line 20.

Vertical sedimentation tanks can be located on any segment or any corner connection of the specified loop reactor. In these vertical sedimentation tanks, polymerization sauce

- 4 016208 the suspension is separated, so that the suspension leaving the reactor contains a higher concentration of solids than the circulating suspension. This allows you to limit the amount of diluent that must be processed and re-loaded into the reactor. It should be understood that the discharge of these vertical sedimentation tanks can be carried out both continuously and periodically.

As shown in FIG. 1, one of the horizontal sections of each of the reactors 2, 3 is provided with four vertical settling tanks 12. Despite the fact that in FIG. 1 shows only four vertical sumps, the present invention also includes loop reactors comprising one or more vertical sumps. In one embodiment of the invention, said loop reactor comprises from 2 to 20 vertical sumps, preferably from 4 to 12 vertical sumps, more preferably from 6 to 10 vertical sumps.

Preferably, the vertical sumps 12 are provided with a shut-off valve 13. Such valves 13 may be, for example, ball valves. Under normal conditions, these valves are open. These valves may be closed, for example, to bring the vertical sump out of operation. These valves 13 may be closed if the pressure in the reactor drops below a predetermined value.

In addition, vertical sumps may be provided with valves 14 for collecting or unloading the product. Unloading is carried out in such a way that the volume discharged from the vertical sump essentially corresponds to the volume of the polymer suspension deposited in the specified sump since the previous discharge. The unloading valve 14 may be any type of valve which, when fully open, allows continuous or periodic unloading of the polymer suspension. An angle valve or ball valve can be successfully used for this. For example, the valve can be arranged so that a solid does not accumulate and does not precipitate in the main part of its body. However, one of ordinary skill in the art may choose the type and design of the valve for unloading required. In accordance with one embodiment of the present invention, at each opening of the valve for unloading, the full volume of the precipitated suspension is discharged. If several vertical sedimentation tanks are used, the discharge of the precipitated polymer suspension can be performed alternately in a circle to more uniformly discharge the product into the next reactor or into the separation zone.

After the valve 14, a three-way valve 15 is located at the outlet of the vertical settler 12, which allows the polymer suspension to be transported deposited in the vertical settlers either to the product recovery zone or to another reactor via a transfer pipe 16.

Each of the vertical sumps 10 installed on the reactor 2, which is connected in series with another reactor 3, can be equipped with a transfer pipe 16 for transporting a suspension of the (intermediate) polymer deposited in the vertical sump 12 to another loop reactor 3. Vertical sumps 12 can also be connected to the pipes of another loop reactor 3 to deliver a suspension of the precipitated polymer to the product recovery zone, for example, through pipelines 19. As used herein it product recovery includes, but is not limited to, heated or unheated evaporation pipelines, an evaporation tank, cyclones, filters, and associated solids and steam extraction systems or transfer pipelines connected to the next reactor, and said next reactor, if several reactors are connected in series .

The two loop reactors 2, 3 shown in FIG. 1 are connected in series by transfer pipelines 16. Said transfer pipelines typically include cylindrical transfer pipelines for the intermediate product, and they are arranged substantially horizontally connecting the outlet of the vertical reactor sump to the inlet of the other reactor. In particular, a transfer pipe connects a three-way valve 15, located at the outlet of the vertical sump 12 of one reactor 2, with the inlet of the other reactor 3, where the piston valve 18 is located.

In FIG. 2 shows in detail the connection of two loop reactors using a transfer pipe. As shown in FIG. 2, the transmission line is directed substantially horizontally; as indicated above, the angle of inclination α to the horizontal axis X-X 'may be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 °.

The tangent of the angle α can also be defined as DN / L, where L is the horizontal distance from the outlet of the vertical reactor sump to the inlet of the other reactor, and DN is the vertical distance from the outlet of the vertical reactor sump, in particular from the three-way valve 15 to the inlet of another reactor, in particular to the piston valve 18. The vertical distance DN from the outlet of the vertical reactor sump to the inlet of dr less than the horizontal distance from the outlet of the vertical reactor sump to the inlet of the other reactor.

In a preferred embodiment, the transfer pipe 16 may be provided with one or

- 5 016208 several devices for controlling the temperature, flow or pressure of the polymer suspension in the specified pipeline. Temperature control devices may, for example, include a jacket. In addition, preferably, diluent flushing means 17 are preferably installed at the inlet of the transfer line. Means 17 for passing isobutane allow you to pass isobutane through the transfer pipe 16, maintaining it in an unbroken condition. This is important if the vertical sump is disabled. One of the advantages of this transmission is that the vertical sump 12 can be reconnected after a period of shutdown.

In another embodiment, the outlet from the transfer pipe 16 for transporting a polymer slurry from one loop reactor to another is provided with one or more valves, preferably piston valves 18. Piston valves 18 can hermetically close the hole connecting the transfer pipe 16 to the loop reactor 3.

It is believed that the arrangement of loop reactors in a multi-loop reactor system essentially in a horizontal plane and the use of essentially horizontal transfer pipelines for transporting an intermediate product can improve the system performance, facilitating the installation of reactors and allowing the installation of reactors at a greater distance from each other from a friend than with vertically mounted reactors.

In addition, a substantially horizontal configuration makes it easy to install straight pipelines. Obstacles in the transfer pipelines, including bends and other deviations, essentially from a horizontal arrangement, and any unnecessary extension of the transfer pipelines can reduce the speed of transportation between loop reactors and increase the frequency of clogging of the transfer pipelines.

The polymerization system proposed in accordance with the present invention minimizes the likelihood of clogging of the transfer piping, since it does not contain areas of likely accumulation of the polyolefin polymer. Thus, in a preferred embodiment, the transfer pipelines are arranged substantially horizontally and do not have any bends or other obstructions. If necessary, additional means can be installed in the transfer pipe to facilitate the flow of the polymer product transported between the loop reactors, for example, vibration hammers.

As additional safety measures in the event of polymer clogging or obstructions formed in the transfer pipelines during operation, more than one transfer pipeline is installed between the loop polymerization reactors.

If for some reason the horizontal transfer pipeline becomes clogged or clogged or, if necessary, to ensure a product flow rate exceeding the transfer pipeline capacity, in order to maintain uninterrupted operation of the system, it is possible to transport a polymer suspension from one polymerization reactor through an additional transfer pipeline to another reactor polymerization. When the transfer pipelines are turned off, the reactors continue to operate.

In a preferred embodiment, more than one transmission line is used, not only to ensure safety, but also to increase productivity. More than one transfer pipeline can be used to maximize the performance of vertical sedimentation tanks and minimize the transfer of diluent from one reactor to another. In another embodiment, some of the transfer pipelines may be shut off, for example, if polymerization is carried out at a reduced rate and upon commissioning of the installation.

Preferably, transfer pipelines for transporting a polymer slurry from one reactor to another are continuously rinsed with a diluent, for example isobutane, whether or not they are in working condition.

In another preferred embodiment, when operating in accordance with the present invention, the protection of all piping, vessels, pumps, valves, etc., from clogging can be accomplished by flushing or purging with nitrogen or a diluent, i.e., isobutane. It should be understood that to prevent clogging or clogging in the installation proposed in accordance with the present invention, means and pipelines are installed to purge or pass the corresponding substance. This is useful, for example, if a complete shutdown and emptying is necessary to inspect the reactor.

From the present description it is clear that the numerical values and sizes of various parts of the reactor are correlated with the dimensions of the polymerization reactors and can be changed in accordance with changes in the dimensions of the entire reactor.

It should be understood that in another preferred embodiment, all lines and pipelines used in accordance with the present invention may be provided with flow control means.

In a preferred embodiment, the present invention can be applied to the bypass reactor shown in FIG. 3. In FIG. 3 shows two single-loop reactors 100, 116 connected in series. Both reactors 100, 116 are composed of a plurality of interconnected pipes 104. Vertical

- 6 016208 sections of pipe segments 104 are preferably provided with heat-exchange jackets 105. The reactants are introduced into the reactor 100 via line 107. The catalyst, possibly in combination with cocatalyst or an activating agent, is introduced into the reactor 100 or 116 via line 106. The polymerization slurry is directly circulated inside the reactors 100, 116, as shown by arrows 108, under the action of one or more pumps, such as an axial pump 101. The pumps can be driven by an electric motor 102. The pumps can be equipped with a set of BP expandable impellers 103. In addition, the reactors 100, 116 are provided with one or more vertical sumps 109 connected to the pipes 104 of the reactors 100, 116. Preferably, the vertical sumps 109 are provided with a shut-off valve 110. In addition, the vertical sumps can be equipped with valves 111 for withdrawal or product discharge, or they can be directly connected to the downstream section. After valve 111, at the outlet of the vertical settler 109 of the reactor 100, there is a transfer line 112, which allows the polymer slurry deposited in the vertical settlers 109 to be transported to another reactor 116, preferably through a piston valve 115. The polymer slurry deposited in the vertical settlers 109 of the reactor 116 may be removed by one or more conduits 113 for product recovery, for example transporting it to a product recovery zone.

Although the present invention has been described using a preferred embodiment, reasonable changes and modifications of the invention can be made by those skilled in the art, and such changes are within the scope of the described invention and the appended claims.

Claims (5)

CLAIM 1. A reactor (1) suitable for the polymerization of ethylene, namely the homopolymerization of ethylene or the copolymerization of ethylene and higher 1-olefin comonomers, which are butene, 1pentene, 1-hexene, 1-octene or 1-decene, including at least two each other reactor (2, 3), located essentially in the same horizontal plane, so that the distance ΔΗ vertically from the outlet of the vertical sump of the first reactor to the inlet of the second reactor is less than the horizontal distance ΔΕ from you the vent hole of the vertical settling tank of the first reactor to the inlet of the second reactor, wherein said compound essentially consists of one or more transfer lines (16) suitable for transporting a suspension of the polymer from the first reactor (2) to the second reactor (3), however, the specified transfer pipe passes from the outlet of the vertical sump of the first reactor into the inlet of the second reactor and is located essentially horizontally at an angle of inclination α to the horizon Flax axis X-X 'is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 °. 2. The reactor according to claim 1, comprising at least two interconnected reactors (2, 3), each of which consists of a plurality of interconnected pipes (4) defining the flow path (8) of the polymer suspension; one or more than one vertical settling tank (12) connected to pipes (4) of the first reactor (2), each of said vertical settling tanks equipped with a transfer pipe (16) for transporting the polymer suspension to another reactor (3); and one or more vertical sumps (12) attached to the pipes (4) of the second reactor (3), for unloading the suspension of the polymer from the reactor (3) into the product recovery zone; at least one pump (6) suitable for maintaining the circulation of the polymer slurry in said multi-loop reactor, the connection between said reactors (2, 3) essentially consisting of one or more transfer lines (16), while said transfer lines are substantially horizontal. 3. The reactor according to claim 1 or 2, in which the transfer pipe is further provided with one or more means for controlling the temperature, flow rate or pressure of the polymer suspension in said pipe. 4. A method of producing ethylene polymers, namely, homopolymerization of ethylene or copolymerization of ethylene and higher 1-olefin comonomers, representing butene, 1-pentene, 1-hexene, 1-octene or 1-decene, using a reactor according to any one of claims 1 to 3 including the following operations: introducing into the first reactor (2) ethylene or ethylene and said higher 1-olefin comonomer, polymerization catalysts and diluents; polymerizing ethylene or ethylene and said higher 1-olefin comonomer to form a polymer slurry; pumping said polymer suspension to maintain circulation in said reactor, wherein said method further includes one or more of the following cycles: after precipitating said polymer suspension in one or more vertical settlers (12) of the first reactor (2), essentially horizontal transportation of said the polymer suspension from the outlet of the vertical sump (12) of the first reactor into the inlet of the second reactor (3) - 7 016208 by means of the specified transfer pipe (16) at an angle of inclination α to the horizontal axis X-X ', constituting 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 °. 5. The method according to claim 4, wherein said reactor is a two-loop reactor comprising two loop reactors connected in series, said compound essentially consisting of one or more transfer pipelines (16) suitable for transporting a suspension of the polymer from the first loop reactor (2) in the second loop reactor (3), comprising the following operations: introducing into the first loop reactor (2) ethylene or ethylene and said higher 1-olefin comonomer, polymerization catalysts and diluents; polymerizing ethylene or ethylene and said higher 1-olefin comonomer to form a polymer slurry; pumping said polymer slurry to maintain circulation in the first loop reactor, wherein said method further includes one or more of the following cycles: after precipitating said polymer slurry in one or more vertical settlers (12) of the first loop reactor (2), substantially horizontal transporting said polymer slurry from said vertical settling tanks (12) to the second loop reactor (3) via said one or more transfer lines (16).