CN109382050B

CN109382050B - Alkylation reactor and alkylation reaction method

Info

Publication number: CN109382050B
Application number: CN201710672374.1A
Authority: CN
Inventors: 袁忠勋
Original assignee: Sinopec Engineering Inc; Sinopec Engineering Group Co Ltd
Current assignee: Sinopec Engineering Inc; Sinopec Engineering Group Co Ltd
Priority date: 2017-08-08
Filing date: 2017-08-08
Publication date: 2020-07-31
Anticipated expiration: 2037-08-08
Also published as: CN109382050A

Abstract

The present disclosure relates to an alkylation reactor and an alkylation reaction method. The alkylation reactor comprises a mixing-reaction element with a specific structure, wherein a liquid catalyst and a reaction feed in the mixing-reaction element enter a reaction area in a second liquid channel in a mode of 'opposed jet' through a first opening and a second opening which are oppositely arranged to carry out mixing reaction, so that the reaction feed and the liquid catalyst can be fully mixed and contacted in the reaction area, the mixing and reaction efficiency is high, and the selectivity and the product quality are improved; the alkylation reactor disclosed by the invention can be provided with a plurality of mixing-reaction modules containing mixing-reaction elements in one reactor to form a multistage reactor with graded feeding, and the alkylation reactor and the method for carrying out alkylation reaction by using the alkylation reactor can realize multistage reaction in one reactor, optimize the alkane-alkene ratio, improve the reaction efficiency, and reduce the reactor investment and the occupied area.

Description

Alkylation reactor and alkylation reaction method

Technical Field

The disclosure relates to the field of petrochemical industry, in particular to an alkylation reactor and an alkylation reaction method.

Background

The reaction in the alkylation reactor of petrochemical industry is carried out under the action of catalyst, the catalyst is divided into two forms of solid and liquid, and the liquid catalyst is usually acidic ionic liquid. It is known from the research of reaction mechanism that for the alkylation reaction process using liquid catalyst, the reaction is mainly completed at the interface of two phases of liquid phase catalyst and hydrocarbon reaction raw material, and the renewal rate of the interface and the ratio of alkane to alkene (alkane-alkene ratio) near the interface are the key factors affecting the selectivity of the main reaction. To achieve higher selectivity for the alkylated product, the alkylation reaction requires strong liquid-liquid mixing and a higher ratio of reacted alkane to alkene.

The existing liquid alkylation technology basically adopts a reactor similar to a static mixer and adopts a mode of multi-section feeding of a plurality of reactors to improve the alkane-olefin ratio in the reactor and strengthen liquid-liquid mixed mass transfer so as to achieve the purposes of improving the selectivity of alkylate oil and improving the product quality. However, the reactor of the type has poor mixing effect, needs a plurality of independent horizontal reactors, and has high investment and large floor area.

Disclosure of Invention

The invention aims to provide an alkylation reactor and an alkylation reaction method, the alkylation reactor has good liquid-liquid mixing mass transfer effect, can effectively promote alkylation reaction and inhibit side reaction, and can greatly improve the selectivity and the product quality of alkylate compared with other mixing forms.

In order to achieve the above object, a first aspect of the present disclosure provides an alkylation reactor comprising a shell, a mixing-reaction module, a liquid catalyst inlet located at the top of the shell, a discharge outlet located at the bottom of the shell, and a reaction feed inlet; the mixing-reaction module comprises an upper partition plate, a lower partition plate and a plurality of mixing-reaction elements which are arranged in parallel at intervals, the end edges of the upper partition plate and the lower partition plate are respectively and fixedly connected with the inner wall of the shell in a sealing way so as to form a reaction feeding area between the upper partition plate and the lower partition plate, the reaction feeding inlet is positioned on the shell corresponding to the reaction feeding area, and each mixing-reaction element vertically penetrates through the reaction feeding area and is respectively and fixedly connected with the upper partition plate and the lower partition plate in a sealing way; each of the mixing-reaction elements comprises a first tubular member and a second tubular member arranged axially; the inner part of the first tubular part is formed into a first liquid channel, and the second tubular part is sleeved outside the first tubular part to form a second liquid channel between the tube walls of the first tubular part and the second tubular part; the bottom end of the first tubular part is closed, the pipe wall of the first tubular part is provided with a plurality of first holes, and the top end of the first tubular part is provided with a first opening; the pipe wall of the second tubular part is provided with a plurality of second open holes, the bottom end of the second tubular part is provided with a second opening, and the top end of the second tubular part is in sealing connection with the top end of the first tubular part; the space above the upper baffle plate is in fluid communication with the interior space of the mixing-reaction element only through the first opening, the reaction feed zone is in fluid communication with the second liquid passage only through the second opening, and the space below the lower baffle plate is in fluid communication with the interior space of the mixing-reaction element only through the second opening.

Optionally, a plurality of mixing-reaction modules are arranged in the shell of the alkylation reactor at intervals from top to bottom, a reaction feed inlet is arranged on the shell corresponding to a reaction feed area of each mixing-reaction module, and the number of the mixing-reaction modules is 1-12.

Optionally, each of said mixing-reaction modules comprises a plurality of said mixing-reaction elements uniformly distributed within said reaction feed zone.

Optionally, the first tubular member is a circular tube or a conical tube with an open upper end, and the second tubular member is a circular tube or a conical tube with an open lower end.

Optionally, the diameter of the first opening is 1-10 mm, and the sum of the opening areas of all the first openings in each mixing-reaction element accounts for 1% -50% of the side wall area of the first tubular member.

Optionally, the diameter of the second openings is 1-10 mm, and the sum of the opening areas of all the second openings in each mixing-reaction element accounts for 1% -50% of the side wall area of the second tubular member.

In a second aspect of the present disclosure, there is provided a method for performing an alkylation reaction using the alkylation reactor provided in the first aspect of the present disclosure, the method comprising the steps of: passing liquid catalyst from said liquid catalyst inlet into said alkylation reactor, through said first opening of said first tubular member into said first liquid passage of said mixing-reaction module, and through said first opening into said second liquid passage; the messenger the reaction feeding warp the reaction feeding entry gets into the reaction feeding district, the reaction feeding warp in the reaction feeding district the second trompil gets into second liquid channel, with the warp first trompil gets into the liquid catalyst of second liquid channel mixes and carries out alkylation reaction with the mode of hedging injection, and the reaction product and the liquid catalyst mixture that obtain follow the second opening leaves and mixes and get into next grade after the reaction module mixes-reaction module or warp the discharge gate leaves alkylation reactor.

Optionally, the liquid catalyst is an acidic ionic liquid catalyst.

Optionally, the reaction feed is a mixture of olefins from C2 to C6 and isoparaffins from C2 to C6.

Through the technical scheme, the alkylation reactor disclosed by the invention comprises the mixing-reaction element with a specific structure, the liquid catalyst and the reaction feed in the mixing-reaction element enter the reaction area in the second liquid channel in a counter-jet mode through the first opening and the second opening which are oppositely arranged to perform mixing reaction, so that the reaction feed and the liquid catalyst can be fully mixed and contacted in the reaction area, the mixing and reaction efficiency is high, and the selectivity and the product quality are improved; the alkylation reactor disclosed by the invention can be provided with a plurality of mixing-reaction modules containing mixing-reaction elements in one reactor to form a multistage reactor with graded feeding, and the alkylation reactor and the method for carrying out alkylation reaction by using the alkylation reactor can realize multistage reaction in one reactor, optimize the alkane-alkene ratio, improve the reaction efficiency, and reduce the reactor investment and the occupied area.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic block diagram of one embodiment of an alkylation reactor provided by the present disclosure.

FIG. 2 is a schematic diagram of a hybrid-reaction module configuration of one embodiment of an alkylation reactor provided by the present disclosure.

Fig. 3 is a schematic top view of a mixing-reaction module of one embodiment of an alkylation reactor provided by the present disclosure (i.e., the AA cross-sectional view of fig. 2).

FIG. 4 is a schematic diagram of a mixing-reaction element configuration of one embodiment of an alkylation reactor provided by the present disclosure.

FIG. 5 is a schematic diagram of a mixing-reaction element configuration of another embodiment of an alkylation reactor provided by the present disclosure.

FIG. 6 is a schematic flow diagram of the liquid flow within the mixing-reaction element of one embodiment of an alkylation reactor provided by the present disclosure.

FIG. 7 is a schematic flow diagram of liquid flow within the reactor for one embodiment of an alkylation reactor provided by the present disclosure.

Description of the reference numerals

1 casing 2 Upper end socket

3 lower end socket 4 mixing-reaction module

5 liquid catalyst inlet 6 reaction feed inlet

7 discharge port 8 mixing-reaction element

9 upper partition board 10 lower partition board

11 first tubular member 12 second tubular member

13 reaction feed zone 14 first opening

15 second opening

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, the use of directional words such as "upper" and "lower" generally refers to "upper" and "lower" of the device in normal use, and specifically refer to the directions of the drawings of fig. 1-2, 4-7. "inner and outer" refer to the outline of the device.

As shown in fig. 1, a first aspect of the present disclosure provides an alkylation reactor comprising a housing 1, a mixing-reaction module 4, a liquid catalyst inlet 5, a discharge port 7, and a reaction feed inlet 6, the liquid catalyst inlet 5 being located at the top of the housing 1, the discharge port 7 being located at the bottom of the housing 1; the mixing-reaction module 4 comprises an upper partition plate 9, a lower partition plate 10 and a plurality of mixing-reaction elements 8 which are arranged in parallel at intervals, the end edges of the upper partition plate 9 and the lower partition plate 10 are respectively and fixedly connected with the inner wall of the shell 1 in a sealing way to form a reaction feeding area 13 between the upper partition plate 9 and the lower partition plate 10, the reaction feeding inlet 6 is positioned on the shell 1 corresponding to the reaction feeding area 13, and each mixing-reaction element 8 vertically penetrates through the reaction feeding area 13 and is respectively and fixedly connected with the upper partition plate 9 and the lower partition plate 10 in a sealing way; each mixing-reaction element 8 comprises a first tubular element 11 and a second tubular element 12 arranged axially; the first tubular member 11 is internally formed into a first liquid channel, and the second tubular member 12 is sleeved outside the first tubular member 11 to form a second liquid channel between the tube walls of the first tubular member and the second tubular member; the bottom end of the first tubular member 11 is closed, the tube wall is provided with a plurality of first holes, and the top end is provided with a first opening 14; the pipe wall of the second tubular member 12 is provided with a plurality of second openings, the bottom end of the second tubular member is provided with a second opening 15, and the top end of the second tubular member is connected with the top end of the first tubular member 11 in a sealing manner; the space above the upper partition 9 is in fluid communication with the inner space of the mixing-reaction element 8 only through the first opening 14, the reaction feed zone 13 is in fluid communication with the second liquid passage only through the second opening, and the space below the lower partition 10 is in fluid communication with the inner space of the mixing-reaction element 8 only through the second opening 15.

The alkylation reactor disclosed by the invention comprises a mixing-reaction element with a specific structure, wherein at least part of first openings and at least part of second openings are oppositely arranged, and a liquid catalyst and a reaction feed in the mixing-reaction element respectively enter a reaction zone in a second liquid channel through the oppositely arranged first openings and second openings in a mode of 'opposed jet' to carry out mixing reaction, so that the reaction feed and the liquid catalyst can be fully mixed and contacted in the reaction zone, the mixing and reaction efficiency is high, and the selectivity and the product quality are improved; the alkylation reactor disclosed by the invention can be provided with a plurality of mixing-reaction modules containing mixing-reaction elements in one reactor to form a multistage reactor with graded feeding, and the alkylation reactor and the method for carrying out alkylation reaction by using the alkylation reactor can realize multistage reaction in one reactor, optimize the alkane-alkene ratio, improve the reaction efficiency, and reduce the reactor investment and the occupied area.

According to the present disclosure, in order to realize a multi-stage reaction in a reactor, further optimize an alkane-alkene ratio and improve reaction efficiency, preferably, a plurality of mixing-reaction modules 4 may be arranged in a shell 1 of the alkylation reactor at intervals from top to bottom, a corresponding reaction feeding inlet 6 is arranged on the shell 1 corresponding to a reaction feeding zone 13 of each mixing-reaction module 4, and the number of the mixing-reaction modules 4 in the shell 1 may be 1 to 12, preferably 9.

In order to further enhance the liquid-liquid mixing efficiency in each mixing-reaction module 4 according to the present disclosure, each mixing-reaction module 4 may preferably include a plurality of mixing-reaction elements 8 uniformly distributed in the feeding region 13, and the number of mixing-reaction elements 8 may be determined by calculation according to the specific conditions of the alkylation reaction.

According to the present disclosure, the shape of the first tubular member 11 and the second tubular member 12 is not particularly required, and may be any shape of a conventional type, as long as the first opening and the second opening of the tube wall of the first tubular member 11 and the second tubular member 12 are opposite to each other, and the material of the first tubular member 11 and the second tubular member 12 may also be a conventional material, preferably a porous metal powder metallurgy or a mesh sintered tube. The first tubular member 11 is preferably a round or conical tube open at the upper end, and the second tubular member 12 is preferably a round or conical tube open at the lower end. For example, in one embodiment of the present disclosure, as shown in fig. 4, the first tubular member 11 is a circular tube with an open upper end, and the second tubular member 12 is a circular tube with an open lower end. In another embodiment of the present disclosure, as shown in fig. 5, the first tubular member 11 is a conical tube with an open upper end, the second tubular member 12 is a circular tube with an open lower end, and the tube diameter of the first tubular member gradually decreases from top to bottom. In the preferred embodiment described above, the first tubular member 11 and the second tubular member 12 are more efficient in liquid mixing through their respective openings and are easy to form.

According to the present disclosure, the tube walls of the first tubular member 11 and the second tubular member 12 may be respectively formed with uniform or non-uniform openings, the size and number of the openings may be varied within a large range, the aperture of the first opening may be 1-10 mm, preferably 3mm, and the sum of the opening areas of all the first openings in each mixing-reaction element 8 may account for 1-50%, preferably 5-30%, and most preferably 10-20% of the side wall area of the first tubular member; the diameter of the second openings may be 1 to 10mm, preferably 3mm, and the sum of the open areas of all the second openings in each mixing-reaction element 8 may account for 1 to 50%, preferably 5 to 30%, most preferably 10 to 20% of the side wall area of the second tubular member. The optimized opening area is more matched with the liquid flow in the reactor, thereby being beneficial to the mixing of the liquid in the reactor and the improvement of the reaction efficiency.

In a preferred embodiment of the present disclosure, as shown in fig. 2, the upper partition 9 is formed with circular holes having the same number as the number of the mixing-reaction elements 8, the diameter of the circular holes is slightly larger than the outer diameter of the second tubular member 12 of the mixing-reaction elements 8, the top of each mixing-reaction element 8 is hermetically fixed in the corresponding circular hole of the upper partition 9, the first opening 14 at the top of the first tubular member 11 is concentric with the circular hole of the upper partition 9 and is an inlet for the liquid catalyst or the mixture of the reaction product and the liquid catalyst, and the outer edge of the upper partition 9 is hermetically fixed to the inner wall of the alkylation reactor shell 1. The lower partition plate 10 is also provided with circular holes having the same number as the mixing-reaction elements 8, and the circular holes of the lower partition plate 10 are in one-to-one concentric correspondence with the horizontal positions of the circular holes of the upper partition plate 9. The mixing-reaction element 8 further comprises a closing cover plate, the top end of the second tubular member 12 is hermetically connected with the first tubular member 11 through the closing cover plate, the outer edge of the closing cover plate is hermetically and fixedly connected with the circumference of the circular hole of the upper partition plate 9, and the second opening 15 of the second tubular member 12 is hermetically and fixedly connected with the circumference of the circular hole of the lower partition plate 10.

In a second aspect of the present disclosure, there is provided a method for performing an alkylation reaction using the alkylation reactor provided in the first aspect of the present disclosure, the method comprising the steps of: the liquid catalyst enters the alkylation reactor from the liquid catalyst inlet 5, then enters the first liquid channel of the mixing-reaction module 4 through the first opening 14 of the first tubular member 11, and then enters the second liquid channel through the first opening; reaction feed enters a reaction feed area 13 through a reaction feed inlet 6, the reaction feed in the reaction feed area 13 enters a second liquid channel through a second opening, and is mixed with a liquid catalyst entering the second liquid channel through the first opening in a counter-jet mode for alkylation reaction, and an obtained reaction product and liquid catalyst mixture enters a next-stage mixing-reaction module 4 after leaving the mixing-reaction module 4 from a second opening 15 or leaves an alkylation reactor through a discharge port 7.

The alkylation reactor comprises a mixing-reaction element with a specific structure, and the alkylation method of the alkylation reactor can ensure that a liquid catalyst and a reaction feed respectively enter a reaction zone through a pore channel in a counter-jet mode in the mixing-reaction element for mixing reaction, so that the reaction feed and the liquid catalyst can be fully mixed and contacted in the reaction zone, the mixing and reaction efficiency is high, and the selectivity and the product quality are improved; meanwhile, multi-stage reaction can be realized by arranging a plurality of mixing-reaction modules containing mixing-reaction elements, so that the alkane-alkene ratio is optimized, the reaction efficiency is improved, and the investment and the occupied area of the reactor are reduced.

In accordance with the present disclosure, the liquid catalyst can be any of a variety of conventional liquid catalysts suitable for alkylation reactions, preferably an acidic ionic liquid catalyst.

According to the present disclosure, the reaction feed may be a mixture of hydrocarbons including olefins and paraffins, preferably a mixture of olefins containing C2 to C6 and isoparaffins containing C2 to C6, more preferably a C4 component containing olefins and paraffins. The alkane-olefin ratio of the reaction feed mixture can be 5-20, preferably 8-15, wherein the 'alkane-olefin ratio' refers to the molar ratio of isoparaffin to olefin in the mixture.

In a preferred embodiment of the present disclosure, as shown in fig. 6-7, the alkylation reactor comprises the following steps:

(1) the liquid catalyst enters the upper space of the first-stage mixing-reaction module of the alkylation reactor from a liquid catalyst inlet 5, enters a first liquid channel through a first opening 14 of a first tubular member 11 of each mixing-reaction element of the first-stage mixing-reaction module, and enters a second liquid channel through a first opening; (2) reaction feed enters a reaction feed area 13 between an upper partition plate and a lower partition plate of the first-stage mixing-reaction module through a reaction feed inlet 6 arranged on the side surface of the reactor shell, the reaction feed in the reaction feed area 13 enters a second liquid channel through second openings of all mixing-reaction elements respectively, and is mixed with a liquid catalyst entering the second liquid channel through the first openings in a counter-jet mode to carry out alkylation reaction; (3) the resulting reaction product and liquid catalyst mixture flow downward in the second liquid channel and then exit the first stage mixing-reaction module through the second openings 15 of the mixing-reaction elements, respectively; (4) the mixture of the reaction product and the liquid catalyst which leaves the first-stage mixing-reaction module enters a first liquid channel of each mixing-reaction element of the second-stage mixing-reaction module through a space between the first-stage mixing-reaction module and the second-stage mixing-reaction module and then enters a second liquid channel through a first opening; in order to maintain the required alkane-olefin ratio for the reaction and improve the selectivity, a part of reaction feed is supplemented to the second-stage mixing-reaction module, the supplemented reaction feed enters the reaction feed area 13 of the second-stage mixing-reaction module from the second-stage reaction feed inlet, enters the second liquid channel through the second opening of the mixing-reaction element, is mixed with the first-stage reaction product and liquid catalyst mixture entering the second liquid channel through the first opening in a counter-jet manner and is subjected to alkylation reaction, and then the reaction product and the liquid catalyst mixture leave the second-stage mixing-reaction module. And so on until the last stage of mixing-reaction module; (5) the reaction product and liquid catalyst mixture leaving the last stage mixing-reaction module enter the lowermost space of the reactor and then leave the alkylation reactor through a discharge port 7; (6) the mixture of reaction product and liquid catalyst leaving the reactor is sent to a subsequent separation facility for separation, so as to separate out alkylation product and liquid catalyst, and the liquid catalyst is sent back to the alkylation reactor for recycling.

The present disclosure is further illustrated with reference to the following examples, but the present disclosure is not to be construed as being limited thereto.

Example 1

As shown in fig. 1 to 4, this example provides an alkylation reactor with a built-in 4-stage mixing-reaction module. The method comprises the following steps: the reactor comprises a shell 1 with the inner diameter of 3800mm and the length of 7400mm, an upper end enclosure 2 and a lower end enclosure 3, wherein the upper end enclosure 2 and the lower end enclosure 3 are respectively welded at two ends of the shell 1 in a sealing manner to form a closed reactor shell, 4 groups of mixing-reaction modules 4 with the thickness of 600mm are installed in the

shell

1, 4 DN100 reaction feeding inlets 6 are arranged on the side surface of the shell 1 and are respectively communicated with each mixing-reaction module, the upper end enclosure 2 is in an ellipsoid shape, a DN200 liquid catalyst inlet 5 is arranged at the top, the lower end enclosure 3 is in an ellipsoid shape, and a DN250 discharge port 7 for a reaction product and a liquid catalyst mixture to leave the reactor is arranged at the bottom;

the mixing-reaction module comprises 18 mixing-reaction elements 8, and an upper partition plate 9 and a lower partition plate 10 are respectively welded and fixed with the shell in a sealing way;

the mixing-reaction element 8 comprises a first tubular member 11 of equal diameter with an internal diameter of 80mm and a second tubular member 12 of internal diameter of 200mm, the first tubular member 11 being 350mm long, the diameter of the holes being 3mm and the aperture ratio being 20% of the surface area of the tube wall; the second fluid passage radial spacing (the distance between the outer diameter of the first tubular member 11 and the inner diameter of the second tubular member 12) is 57 mm; the second tubular member 12 is a sintered metal powder metallurgy tube having a porosity of 18% of the surface area of the tube wall; the diameter of the second opening 15 of the mixing-reaction element is 100 mm;

the liquid catalyst is an acidic ionic liquid catalyst containing chloride; the reaction feed composition (% by weight) is shown in table 1.

TABLE 1

Reaction feed Components	Content (wt%)
		Propane	0.08
Propylene (PA)	0.02
		Isobutane	43.0
N-butane	23.0
		Trans-2-butene	12.5
1-butene	12.5
		Isobutene	0.02
Cis-2-butene	7.9
		1, 3-butadiene	0.2
Others	0.78
		Total up to	100.0

Reaction conditions are as follows: the average reaction temperature was 20 ℃; the feed alkane to alkene ratio averaged 10.0 (molar ratio).

The yield of the alkylate was 81.5%.

Example 2

The first tubular member 11, which is the same as example 1 except that it is disposed in the mixing-reaction element 8, is shaped as an inverted conical tube having a larger top diameter and a smaller lower diameter, and has a ratio of the upper and lower diameters of 1: 0.65, the inner diameter of the upper part is 80mm, the length of the first tubular part 11 is 350mm, the diameter of the hole is 3mm, and the opening rate is 21 percent of the surface area of the tube wall;

the second fluid passage radial spacing (the distance between the outer diameter of the first tubular member 11 and the inner diameter of the second tubular member 12) was 57mm at the upper portion and 71mm at the lower portion; the second tubular member 12 is a metal mesh fired tube with a porosity of 18% of the surface area of the tube wall and the second opening 15 of the mixing-reaction element has a diameter of 100 mm.

The yield of the alkylate was 81.1%.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. An alkylation reactor, characterized in that it comprises a shell (1), a mixing-reaction module (4), a liquid catalyst inlet (5), a discharge port (7) and a reaction feed inlet (6), the liquid catalyst inlet (5) being located at the top of the shell (1), the discharge port (7) being located at the bottom of the shell (1);

the mixing-reaction module (4) comprises an upper partition plate (9), a lower partition plate (10) and a plurality of mixing-reaction elements (8), wherein the upper partition plate (9), the lower partition plate (10) and the plurality of mixing-reaction elements (8) are arranged in parallel at intervals, the end edges of the upper partition plate (9) and the lower partition plate (10) are respectively fixedly connected with the inner wall of the shell (1) in a sealing manner so as to form a reaction feeding area (13) between the upper partition plate (9) and the lower partition plate (10), the reaction feeding inlet (6) is positioned on the shell (1) corresponding to the reaction feeding area (13), and each mixing-reaction element (8) vertically penetrates through the reaction feeding area (13) and is respectively fixedly connected with the upper partition plate (9) and the lower;

each of said mixing-reaction elements (8) comprises a first tubular member (11) and a second tubular member (12) arranged axially; the inner part of the first tubular part (11) is formed into a first liquid channel, and the second tubular part (12) is sleeved outside the first tubular part (11) to form a second liquid channel between the tube walls of the first tubular part and the second tubular part; the bottom end of the first tubular member (11) is closed, the pipe wall of the first tubular member is provided with a plurality of first openings, and the top end of the first tubular member is provided with a first opening (14); the pipe wall of the second tubular part (12) is provided with a plurality of second open holes, the bottom end of the second tubular part is provided with a second opening (15), and the top end of the second tubular part is hermetically connected with the top end of the first tubular part (11); at least part of the first opening and at least part of the second opening of the mixing-reaction element (8) are oppositely arranged; the space above the upper partition (9) is in fluid communication with the interior space of the mixing-reaction element (8) only through the first opening (14), the reaction feed zone (13) is in fluid communication with the second liquid passage only through the second opening, and the space below the lower partition (10) is in fluid communication with the interior space of the mixing-reaction element (8) only through the second opening (15).

2. The alkylation reactor according to claim 1, wherein a single or a plurality of the mixing-reaction modules (4) are arranged in the shell (1) of the alkylation reactor from top to bottom, the mixing-reaction modules (4) are arranged at intervals, a reaction feed inlet (6) is arranged on the shell (1) corresponding to the reaction feed zone (13) of each mixing-reaction module (4), and the number of the mixing-reaction modules (4) is 1-12.

3. The alkylation reactor according to claim 1, wherein each mixing-reaction module (4) comprises a plurality of mixing-reaction elements (8) uniformly distributed within the reaction feed zone (13).

4. Alkylation reactor according to claim 1, characterized in that the first tubular member (11) is a round or conical tube open at its upper end.

5. Alkylation reactor according to claim 1, characterized in that the second tubular member (12) is a round or conical tube open at its lower end.

6. The alkylation reactor according to claim 1, wherein the first openings have a diameter of 1 to 10mm, and the sum of the open areas of all the first openings in each mixing-reaction element (8) accounts for 1 to 50% of the area of the side wall of the first tubular member.

7. The alkylation reactor according to claim 1, wherein the diameter of the second openings is 1-10 mm, and the sum of the open areas of all the second openings in each mixing-reaction element (8) accounts for 1-50% of the area of the side wall of the second tubular member.

8. A method for performing an alkylation reaction using the alkylation reactor according to any one of claims 1 to 7, the method comprising the steps of:

passing liquid catalyst into the alkylation reactor from the liquid catalyst inlet (5), then into the first liquid passage of the mixing-reaction module (4) via the first opening (14) of the first tubular member (11), and then into the second liquid passage via the first opening; make the reaction feeding warp reaction feed inlet (6) get into reaction feed area (13), the reaction feeding warp in reaction feed area (13) the second trompil gets into second liquid channel, with the warp first trompil gets into the liquid catalyst of second liquid channel mixes and the alkylation reaction with the mode of impinging jet, and the reaction product that obtains and liquid catalyst mixture follow second opening (15) leave and mix and get into next stage after-reaction module (4) and mix-reaction module (4) or warp discharge gate (7) leave alkylation reactor.

9. The method of claim 8, wherein the liquid catalyst is an acidic ionic liquid catalyst.

10. The method of claim 8, wherein the reaction feed is a mixture of C2-C6 olefins and C2-C6 isoparaffins.