WO2023284024A1 - Micro-interface strengthening system for preparing octenal by n-butyraldehyde condensation, and preparation method - Google Patents

Abstract

Provided is a micro-interface strengthening system for preparing octenal by n-butyraldehyde condensation. The system comprises: a reactor; and a partition plate arranged in the reactor, the inner space of the reactor being divided into two mutually-independent spaces along the partition plate. A space below the partition plate is a first reaction region. An n-butyraldehyde inlet and an alkaline solution inlet are formed on a side wall of the first reaction region. A first micro-interface generator is disposed in the first reaction region. The first micro-interface generator is connected to the n-butyraldehyde inlet and the alkaline solution inlet. An alkaline solution is dispersed and broken up into micro-droplets at a micron level by the first micro-interface generator, and then enters the first reaction region for catalyzing the condensation reaction of n-butyraldehyde. The micro-interface strengthening system for preparing octenal by n-butyraldehyde condensation has low energy consumption, low cost and high safety. The required reaction temperature is low, and the n-butyraldehyde conversion rate is high.

Description

[Title of the invention established by ISA under Rule 37.2] Micro-interface strengthening system and preparation method for the condensation of n-butyraldehyde to octenal technical field

The invention relates to the technical field of n-butyraldehyde condensation, in particular to a micro-interface strengthening system and a preparation method for preparing octenal through n-butyraldehyde condensation.

Background technique

Butyl octanol is an important raw material for the synthesis of fine chemical products. At present, the output of butylated octanol in my country is huge, accounting for about 21% of the world's total. Butyl octanol is mainly used in the production of plasticizers, solvents, dehydrating agents, defoamers, dispersants Agents, flotation agents, petroleum additives and synthetic spices, etc. Due to its wide range of uses, the production and consumption of butanol have also increased year by year.

Butyl octanol can be prepared by condensation of n-butyraldehyde, specifically:

(1) N-butyraldehyde condensation reaction generates 2-ethyl-3-propyl acrolein (EPA):

2CH ₂ CH ₂ CH ₃ CHO→CH ₃ CH ₂ CH ₂ CH=C(C ₂ H ₅ )CHO+H ₂ O

(2) Hydrogenation of 2-ethyl-3-propyl acrolein to generate octanol:

CH ₃ CH ₂ CH ₂ CH=C(C ₂ H ₅ )CHO+2H ₂ →CH ₃ CH ₂ CH ₂ CH(CH ₂ CH ₃ )CH ₂ OH

At present, the n-butyraldehyde condensation process has the following defects:

(1) The lye and n-butyraldehyde directly enter the stirred tank condensation reactor in liquid-liquid two-phase, the distribution uniformity of the two phases is limited, the shape of the droplet is irregular and the diameter is large, and the area of the liquid-liquid interface is small, which affects the interphase transmission. quality and reaction efficiency;

(2) In order to ensure the expected butyraldehyde condensation reaction speed in the condensation reactor, the current operating temperature in the reactor is relatively high, the concentration of lye NaOH is high, and the residence time of the reaction product is too long, which will lead to an increase in heavy components and affect the concentration of butyraldehyde. Aldehyde yield;

(3) The overall yield of the condensation reaction needs to be improved, and the butyraldehyde content at the bottom of the tower is relatively high;

(4) The reboiler at the bottom of the condensation cycle tower has a large liquid holding capacity, and the product residence time is too long, resulting in local overheating, which may lead to an increase in the content of heavy components.

In view of this, the present invention is proposed.

Contents of the invention

The first object of the present invention is to provide a micro-interface strengthening system for producing octenal by condensation of n-butyraldehyde. The reaction system divides the reactor into upper and lower reaction zones, so that the raw materials undergo two reactions, and the raw materials react more fully. , improve the conversion rate of raw materials; by setting the first micro-interface generator in the first reaction zone, utilize the first micro-interface generator to disperse and break the lye into micron-scale micro-droplets and then disperse them in the n-butyraldehyde solution , the uniformity of two-phase distribution is improved, the droplet shape is uniform, the diameter is small, the mass transfer rate is greatly improved, the temperature required for the reaction is reduced, and the product yield is increased.

The second object of the present invention is to provide a method for preparing octenal using the above-mentioned system. The preparation method is easy to operate, has a high conversion rate of butyraldehyde, and has high product quality, which is conducive to reducing energy consumption and is better than the existing process. response effect.

In order to realize the above-mentioned purpose of the present invention, special adopt following technical scheme:

The invention provides a micro-interface strengthening system for producing octenal by condensation of n-butyraldehyde, comprising: a reactor; a partition plate is arranged inside the reactor, and the inner space of the reactor is divided into two parts along the partition plate. a space independent of each other; the space located below the dividing plate is the first reaction zone;

The side wall of the first reaction zone is provided with a n-butyraldehyde inlet and a lye inlet, and the inside of the first reaction zone is provided with a first micro-interface generator, and the first micro-interface generator and the n-butyraldehyde The aldehyde inlet is connected to the lye inlet, and the lye is dispersed and broken into micron-sized droplets by the first micro-interface generator, and then enters the first reaction zone to catalyze the condensation reaction of the n-butyraldehyde.

In the prior art, the condensation of n-butyraldehyde to prepare octenal is an important link in the preparation process of butanol and octanol. However, in the current n-butyraldehyde condensation process, the lye and n-butyraldehyde directly enter the stirred tank condensation reactor in liquid-liquid two-phase, the two-phase distribution uniformity is limited, the droplet shape is irregular and the diameter is large, and the liquid-liquid The phase boundary area is small, which affects the mass transfer and reaction efficiency between phases; and because the operating temperature in the reactor is high, the concentration of lye NaOH is high, and the residence time of the reaction product is too long, which will lead to an increase in heavy components and affect the yield of n-butyraldehyde.

In order to solve the above-mentioned technical problems, the invention provides a micro-interface strengthening system for producing octenal by condensation of n-butyraldehyde. The system divides the reactor into upper and lower two reaction zones, so that the raw materials undergo two reactions, and the raw materials react more efficiently. Fully, the conversion rate of raw materials is improved; by setting the first micro-interface generator in the first reaction zone, the lye is dispersed and broken into micron-level micro-droplets by the first micro-interface generator, and then dispersed into the n-butyraldehyde solution Among them, the uniformity of the two-phase distribution is improved, the shape of the droplets is uniform, the diameter is small, the mass transfer rate is greatly improved, the temperature required for the reaction is reduced, and the product yield is improved, and the system does not need to use a rectification tower, occupying an area The area is small.

Preferably, the second reaction zone is located above the dividing plate; a second micro-interface generator is arranged in the second reaction zone, the first reaction zone is connected with a first circulation pipeline, and the first reaction zone is connected with a first circulation pipeline. The inlet of a circulation pipeline is connected with the first reaction zone, and the outlet of the first circulation pipeline is respectively connected with the first micro-interface generator and the second micro-interface generator.

Preferably, it also includes a second condenser and a chromatograph; a product outlet is provided on the side wall of the second reaction zone, and the product outlet is connected with a second circulation line, and the second circulation line is provided with The first condenser; part of the material circulated by the second circulation line flows back into the second micro-interface generator after being condensed by the first condenser, and another part flows into the second micro-interface generator after being condensed by the second condenser in the chromatograph.

Preferably, distribution plates are provided at the outlets of the first micro-interface generator and the second micro-interface generator.

Preferably, the distribution plate is conical, and a plurality of through holes are vertically arranged on the distribution plate.

In the present invention, by dividing the reactor into the first reaction zone and the second reaction zone, the reaction materials are reacted twice, the material reaction is more complete, and the raw material reaction is more complete; both the first reaction zone and the second reaction zone are provided with micro-interfaces The generator can disperse the lye into micron-level microbubbles, and then evenly disperse it into n-butyraldehyde, which improves the mixing uniformity of the two and improves the catalytic effect. During the reaction, the lye is dispersed and broken into micron-sized droplets by the first micro-interface generator, and then dispersed into n-butyraldehyde to catalyze the condensation reaction of n-butyraldehyde. The first reaction zone continues to react under the dispersion and crushing of the first micro-interface generator, and the other part flows into the second reaction zone; the stream flowing into the second reaction zone is passed into the second micro-interface generator, and the lye in it is passed through The second micro-interface generator is dispersed into micro-droplets and dispersed into the second reaction zone to catalyze the continued reaction of unreacted n-butyraldehyde. The two-phase mixing uniformity of n-butyraldehyde and lye is high, which improves the catalytic effect, increases the mass transfer area of the phase boundary, and reduces the temperature required for the reaction.

It should be noted that, in the present invention, the two phases dispersed and broken by the micro-interface generator are all liquid phases. This is because although the lye and n-butyraldehyde are both liquid phases, these two liquids do not mix with each other, and the lye is Water phase, n-butyraldehyde is the oil phase, and lye plays the effect of catalyst in the n-butyraldehyde condensation reaction, and in the present invention, lye is dispersed phase, and n-butyraldehyde is continuous phase, in order to improve two liquid phases The contact area between the two can be mixed evenly to achieve the best catalytic effect. The micro-interface of the dispersed phase lye is broken by the micro-interface generator to disperse it into micron-level micro-droplets, and n-butyraldehyde is introduced at the same time It is not only to provide power, but also to make the lye micro-droplets evenly distributed in the n-butyraldehyde, which improves the mixing uniformity of the two phases, and improves the catalytic effect and reaction rate of the lye on the condensation reaction.

In the present invention, the number of the first micro-interface generator and the second micro-interface generator can be only one, or multiple in series or parallel. When multiple in parallel, two adjacent micro-interfaces The outlets of the generators are opposite, so that two opposite micro-droplet flows can be used to form a countercurrent flow, which improves the dispersion uniformity of the lye micro-droplets in n-butyraldehyde and improves the catalytic effect.

In the present invention, the outlets of the first micro-interface generator and the second micro-interface generator are all provided with a distribution plate, which is to promote the uniform distribution of micro-droplets in n-butyraldehyde through the distribution plate and improve the efficiency of two-phase mixing. Evenness. During the reaction, a part of the micro-droplets flows and disperses along the surface of the distribution plate, and the other part is distributed in different directions through the through holes on the distribution plate.

When the micro-interface strengthening system for producing octenal by condensation of n-butyraldehyde of the present invention is in use, no rectification tower is required, because the conversion rate of the material has basically reached the requirement after two reactions in the reactor, and there is no need for rectification again . Also therefore, the whole system of the present invention occupies a small area and is easy to use.

Those skilled in the art can understand that the micro-interface generator used in the present invention has been embodied in the inventor's previous patents, such as application numbers CN201610641119.6, CN201610641251.7, CN201710766435.0, CN106187660, CN105903425A, Patents of CN109437390A, CN205833127U and CN207581700U. The specific product structure and working principle of the micro-bubble generator (that is, the micro-interface generator) were introduced in detail in the prior patent CN201610641119.6. There is a cavity, the body is provided with an inlet communicating with the cavity, the opposite first end and second end of the cavity are open, and the cross-sectional area of the cavity is from the middle of the cavity to the first end and the second end of the cavity. The second end is reduced; the secondary broken piece is arranged at at least one of the first end and the second end of the cavity, a part of the secondary broken piece is set in the cavity, and the two ends of the secondary broken piece and the cavity are open An annular channel is formed between the through holes. The micron bubble generator also includes an inlet pipe and a liquid inlet pipe.” From the specific structure disclosed in the application document, it can be known that the specific working principle is: the liquid enters the micrometer tangentially through the liquid inlet pipe. In the bubble generator, the gas is rotated and cut at a super high speed, so that the gas bubbles are broken into micron-level micro-bubbles, thereby increasing the mass transfer area between the liquid phase and the gas phase, and the micro-bubble generator in this patent belongs to the pneumatic micro-interface generation device.

In addition, it is recorded in the prior patent 201610641251.7 that the primary bubble breaker has a circulating liquid inlet, a circulating gas inlet, and a gas-liquid mixture outlet, while the secondary bubble breaker connects the feed port with the gas-liquid mixture outlet, indicating that the bubble breaker is both It needs to be mixed with gas and liquid. In addition, it can be seen from the following drawings that the primary bubble breaker mainly uses circulating fluid as power, so in fact, the primary bubble breaker is a hydraulic micro-interface generator, and the secondary bubble breaker is a gas-liquid breaker. The mixture is passed into the elliptical rotating ball for rotation at the same time, so that the bubbles are broken during the rotation process, so the secondary bubble breaker is actually a gas-liquid linkage micro-interface generator. In fact, whether it is a hydraulic micro-interface generator or a gas-liquid linkage micro-interface generator, they all belong to a specific form of the micro-interface generator, but the micro-interface generator used in the present invention is not limited to the above-mentioned several forms The specific structure of the bubble breaker described in the prior patents is only one of the forms that the micro-interface generator of the present invention can adopt. In addition, it is recorded in the previous patent 201710766435.0 that "the principle of the bubble breaker is high-speed jet flow to achieve gas collision", and it is also explained that it can be used in micro-interface strengthening reactors to verify the relationship between the bubble breaker and the micro-interface generator. and the prior patent CN106187660 also has relevant records for the specific structure of the bubble breaker, specifically see paragraphs [0031]-[0041] in the description, and the accompanying drawings, which describe the bubble breaker S-2 The specific working principle of the bubble breaker is described in detail. The top of the bubble breaker is the liquid phase inlet, and the side is the gas phase inlet. The liquid phase coming in from the top provides the entrainment power, so as to achieve the effect of crushing into ultra-fine bubbles, which can also be seen in the attached drawings. The bubble breaker has a conical structure, and the diameter of the upper part is larger than that of the lower part, which is also for the liquid phase to provide better entrainment power.

Since the micro-interface generator was just developed in the early stage of the patent application, it was named micro-bubble generator (CN201610641119.6) and bubble breaker (201710766435.0) in the early stage. With continuous technological improvement, it was later renamed as micro-interface generator Device, now the micro-interface generator in the present invention is equivalent to the previous micro-bubble generator, bubble breaker, etc., but the name is different. In summary, the micro-interface generator of the present invention belongs to the prior art.

Preferably, the n-butyraldehyde inlet is connected with a n-butyraldehyde pipeline, and the lye inlet is connected with a lye pipeline.

Preferably, a lye outlet is provided at the bottom of the chromatograph, and the lye outlet is connected to the lye pipeline.

Preferably, the bottom of the chromatograph is provided with an extraction port, and the extraction port is connected to the second condenser; the product separated by the chromatographic device is extracted through the extraction port, and is extracted from the second circulation The stream flowing out of the pipeline is extracted after heat exchange in the second condenser.

Preferably, the top of the chromatograph is provided with a non-condensable gas outlet.

The present invention also provides a preparation method of a micro-interface strengthening system using the above-mentioned condensation of n-butyraldehyde to prepare octenal, comprising the following steps:

After the lye is broken into micron-level micro-droplets through the micro-interface, it catalyzes the condensation reaction of n-butyraldehyde to obtain the product octenal.

Preferably, the condensation reaction temperature is 110-120° C., and the pressure is 0.1-0.8 MPa. Further, the condensation reaction temperature is 114-117° C., and the pressure is 0.2-0.4 MPa.

The octenal product obtained by the reaction method of the invention has good quality and high yield. Moreover, the preparation method itself has low reaction energy consumption, and the cost is significantly reduced.

Compared with prior art, the beneficial effect of the present invention is:

The micro-interface strengthening system for preparing octenal by n-butyraldehyde condensation of the present invention divides the reactor into upper and lower two reaction zones, so that the raw materials undergo two reactions, the raw materials react more fully, and the conversion rate of the raw materials is improved; The first micro-interface generator and the second micro-interface generator are respectively installed in the first reaction zone and the second reaction zone, and the alkali solution is dispersed and broken into micron-sized micro-droplets by the micro-interface generator, and then dispersed into the n-butyraldehyde solution , the uniformity of two-phase distribution is improved, the droplet shape is uniform, the diameter is small, the mass transfer rate is greatly improved, the temperature required for the reaction is reduced, and the product yield is increased.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiment. The drawings are only for the purpose of illustrating a preferred embodiment and are not to be considered as limiting the invention. Also throughout the drawings, the same reference numerals are used to designate the same parts. In the attached picture:

Fig. 1 is the structural representation of the micro-interface strengthening system of the n-butyraldehyde condensation preparation octenal provided by the embodiment of the present invention;

Fig. 2 is the structural representation of the reactor that the embodiment of the present invention provides;

Fig. 3 is a schematic structural diagram of a distribution plate provided by an embodiment of the present invention;

Fig. 4 is a structural schematic diagram of a reaction system for producing octenal by condensation of n-butyraldehyde provided in Comparative Example 2 of the present invention. Description of drawings:

10-reactor; 20-first reaction zone;

201-Import of lye; 202-Import of n-butyraldehyde;

203-the first micro-interface generator; 204-distribution plate;

205 - through hole;

30-the second reaction zone; 301-the second micro-interface generator;

302-product outlet; 40-lye pipeline;

50-n-butyraldehyde pipeline; 60-first circulation pipeline;

70-the second circulation pipeline; 80-the first condenser;

90-second condenser; 100-chromatograph;

1001-lye outlet; 1002-mining outlet;

1003-non-condensable gas outlet; 110-partition plate.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are some of the embodiments of the present invention, rather than all of them. It is only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. Those who do not indicate the specific conditions in the examples are carried out according to the conventional conditions or the conditions suggested by the manufacturer. The reagents or instruments used were not indicated by the manufacturer, and they were all conventional products that could be purchased from the market.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

In order to illustrate the technical solution in the present invention more clearly, the following will be described in the form of specific examples.

Example

Referring to Fig. 1-3, present embodiment provides a kind of micro-interface strengthening system of n-butyraldehyde condensation to produce octenal, comprising: reactor 10; The space is divided into two mutually independent spaces along the dividing plate 110; the first reaction zone 20 is located below the dividing plate 110, and the second reaction zone 30 is positioned above the dividing plate; the reactor 10 can be a reactor, a reaction tower or tank.

As shown in Figure 2, the side wall of the first reaction zone 20 is provided with n-butyraldehyde inlet 202 and lye inlet 201, and n-butyraldehyde inlet 202 is connected with n-butyraldehyde pipeline 50, and lye inlet 201 is connected with lye Line 40. The inside of the first reaction zone 20 is provided with a first micro-interface generator 203, the first micro-interface generator 203 is connected to the n-butyraldehyde inlet 202 and the lye inlet 201, and the lye is dispersed and broken into microns by the first micro-interface generator 203 After entering the first reaction zone 20, the micro-droplets enter the first reaction zone 20 to catalyze the condensation reaction of n-butyraldehyde.

Continue to refer to Fig. 2, the second micro-interface generator 301 is arranged in the second reaction zone 30, the first reaction zone 20 is connected with the first circulation pipeline 60, the inlet of the first circulation pipeline 60 is connected with the first reaction zone 20 , the outlet of the first circulation pipeline 60 is connected to the first micro-interface generator 203 and the second micro-interface generator 301 respectively.

The micro-interface strengthening system of this embodiment also includes a second condenser 90 and a chromatograph 100; a product outlet 302 is provided on the side wall of the second reaction zone 30, and the product outlet 302 is connected with a second circulation pipeline 70, and the second The circulation line 70 is provided with a first condenser 80; part of the material circulated in the second circulation line 70 is condensed by the first condenser 80 and then flows back into the second micro-interface generator 301, and the other part passes through the second condenser 90 After condensing, it flows into the chromatograph 100.

As shown in FIG. 3 , distribution plates 204 are provided at the outlets of the first micro-interface generator 203 and the second micro-interface generator 301 . The distribution plate 204 is conical, and a plurality of through holes 205 are vertically arranged on the distribution plate 204 .

In this embodiment, a lye outlet 1001 is provided at the bottom of the chromatograph 100 , and the lye outlet 1001 is connected to the lye pipeline 40 . The bottom of the chromatograph 100 is provided with a recovery port 1002, and the recovery port 1002 is connected to the second condenser 90; the product separated by the chromatograph 100 is recovered through the recovery port 1002, and flows out from the second circulation line 70 in the It is extracted after heat exchange in the second condenser 90 . A non-condensable gas outlet 1003 is provided on the top of the chromatograph 100 for discharging the non-condensable gas.

During the reaction, n-butyraldehyde and lye enter the first micro-interface generator 203 respectively, and the lye is dispersed and broken into micro-droplets of micron level in the first micro-interface generator 203 and mixed with n-butyraldehyde to catalyze the n-butyraldehyde Aldehyde is condensed to generate octenal; the reacted material flows into the second reaction zone 30 through the first circulation pipeline 60, and is further dispersed and broken in the second micro-interface generator 301, and the unreacted n-butyraldehyde continues to react, The generated product enters the chromatograph 100 after being condensed by the second condenser 90, and the octenal separated by chromatography is extracted from the extraction port 1002, and a part of the mixed lye is directly discharged, and the other part flows back to the lye pipeline 40 Continue to participate in the reaction.

Comparative example 1

The difference between this embodiment and the embodiment is only that the first micro-interface generator and the second micro-interface generator are not provided in this embodiment.

Comparative example 2

As shown in Figure 4, the difference between this example and the embodiment is that there is no partition plate inside the reactor 10 in this example, and the reactor 10 is a whole reaction space, and the first micro-interface generator 203 and the second micro-interface generate The device 301 is set in it, and the first micro-interface generator 203 and the second micro-interface generator 301 are connected to the n-butyraldehyde pipeline and the lye pipeline, and the reaction product enters the chromatograph after being condensed by the second condenser DMC was obtained after purification and separation.

The systems of Examples and Comparative Examples were used to prepare octenal at different temperatures and pressures, wherein the temperature of Experimental Example 1 was 110° C. and the pressure was 0.1 MPa;

The temperature of Experimental Example 2 is 114°C and the pressure is 0.2MPa;

The temperature of Experimental Example 3 is 115°C and the pressure is 0.3MPa;

The temperature of Experiment 4 is 117°C and the pressure is 0.4MPa;

The temperature of Experimental Example 5 was 120° C., and the pressure was 0.8 MPa.

The specific process parameters are as follows:

Experimental example 1 parameter table

Experimental example 2 parameter table

Experimental example 3 parameter table

Experimental example 4 parameter table

Experimental example 5 parameter table

It can be seen that the micro-interface strengthening system for producing octenal by condensation of n-butyraldehyde of the present invention can increase the reaction space-time yield, increase the yield of octenal, and improve energy efficiency and material efficiency while reducing the operating temperature and reaction space time.

In a word, compared with the reaction system for producing octenal by condensation of n-butyraldehyde in the prior art, the micro-interface strengthening system for producing octenal by condensation of n-butyraldehyde of the present invention has low energy consumption, low cost, high safety, and requires The reaction temperature is low and the conversion rate of n-butyraldehyde is high, so it is worthy of popularization and application.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. A micro-interface strengthening system for producing octenal by condensation of n-butyraldehyde, characterized in that it comprises: a reactor; a partition plate is arranged in the reactor, and the interior space of the reactor is divided into two parts along the partition plate. a space independent of each other; the space located below the dividing plate is the first reaction zone;

   The side wall of the first reaction zone is provided with a n-butyraldehyde inlet and a lye inlet, and the inside of the first reaction zone is provided with a first micro-interface generator, and the first micro-interface generator and the n-butyraldehyde The aldehyde inlet is connected to the lye inlet, and the lye is dispersed and broken into micron-sized droplets by the first micro-interface generator, and then enters the first reaction zone to catalyze the condensation reaction of the n-butyraldehyde.
2. The micro-interface strengthening system for preparing octenal by n-butyraldehyde condensation according to claim 1 is characterized in that, the second reaction zone is located above the partition plate; the second reaction zone is provided with a second Micro-interface generator, the first reaction zone is connected with a first circulation pipeline, the inlet of the first circulation pipeline is connected with the first reaction zone, and the outlet of the first circulation pipeline is respectively connected with the The first micro-interface generator is connected to the second micro-interface generator.
3. The micro-interface strengthening system for preparing octenal by n-butyraldehyde condensation according to claim 2 is characterized in that it also includes a second condenser and a chromatograph; the side wall of the second reaction zone is provided with a product outlet , the product outlet is connected with a second circulation pipeline, and a first condenser is arranged on the second circulation pipeline; a part of the material circulated in the second circulation pipeline is condensed by the first condenser and then flows back to the In the second micro-interface generator, another part flows into the chromatograph after being condensed by the second condenser.
4. The micro-interface strengthening system for producing octenal by condensation of n-butyraldehyde according to claim 2, characterized in that distribution discs are arranged at the outlets of the first micro-interface generator and the second micro-interface generator .
5. The micro-interface strengthening system for producing octenal by condensation of n-butyraldehyde according to claim 4, characterized in that, the distribution plate is conical, and a plurality of through holes are vertically arranged on the distribution plate.
6. The micro-interface strengthening system for producing octenal by condensation of n-butyraldehyde according to claim 3, wherein the n-butyraldehyde inlet is connected with a n-butyraldehyde pipeline, and the lye inlet is connected with an lye pipeline .
7. The micro-interface strengthening system for preparing octenal by condensation of n-butyraldehyde according to claim 6, characterized in that, the bottom of the chromatograph is provided with a lye outlet, and the lye outlet is connected to the lye pipeline .
8. The micro-interface strengthening system for producing octenal by condensation of n-butyraldehyde according to claim 7, characterized in that, the bottom of the chromatograph is provided with an extraction outlet, and the extraction outlet is connected to the second condenser; The product separated by the chromatograph is extracted through the extraction outlet, and is extracted after exchanging heat with the stream flowing out of the second circulation pipeline in the second condenser.
9. Adopt the preparation method of the micro-interface strengthening system of the n-butyraldehyde condensation system octenal described in any one of claim 1-8, it is characterized in that, comprise the steps:

   After the lye is broken into micron-level micro-droplets through the micro-interface, it catalyzes the condensation reaction of n-butyraldehyde to obtain the product octenal.
10. The reaction method according to claim 9, characterized in that the condensation reaction temperature is 110-120°C and the pressure is 0.1-0.8MPa; preferably, the condensation reaction temperature is 114-117°C and the pressure is 0.2- 0.4MPa.

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