CN209490803U - A kind of horizontal efficient plug flow bubbling reactor - Google Patents
A kind of horizontal efficient plug flow bubbling reactor Download PDFInfo
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- CN209490803U CN209490803U CN201920102966.4U CN201920102966U CN209490803U CN 209490803 U CN209490803 U CN 209490803U CN 201920102966 U CN201920102966 U CN 201920102966U CN 209490803 U CN209490803 U CN 209490803U
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Abstract
The utility model discloses a kind of horizontal efficient plug flow bubbling reactor, multiple reaction members are divided by outlet partition plate and entrance partition in reactor, each reaction member is equipped with fluid inlet deflector and liquid-phase outlet deflector, gas distributor；The gas distributor includes horizontally disposed main distributor and the arch distributor respectively at reactor arch area；Each reaction member is divided into liquid phase guiding region, blistering reaction area, gas phase zone and descending liquid area.For the utility model by the design and integration to fluid inlet, outlet deflector and gas distributor, making liquid phase in reactor is in flat-pushing flow pattern, advantageously reduces decomposition and the excessive oxidation of organic peroxide, improves the selectivity of target product.
Description
Technical field
The utility model relates to a kind of high efficient horizontal bubbling reactor, especially a kind of atmospheric boiling point that is used for is 80-150 DEG C
Organic matter contact the horizontal bubbling reactor of production organic hydroperoxide with gas reactant, such as it is hexamethylene, ethylbenzene, different
Propyl benzene etc..
Background technique
In gas-liquid contact reactor, common packed bed reactor, falling film reactor, plate-type reactor, blistering reaction
Device, stirred reactor, spray reactor and high speed turbulence reactor, wherein bubbling reactor has very big liquid storage amount, is suitable for
In the big reaction of long response time and thermal discharge.This is the reaction of organic matter hydrogen peroxide particularly suitable for organic matter liquid phase oxidation, such as
Patent US4066706, ethylbenzene oxidation are ethylbenzene hydroperoxide；Patent US6956136, cumene oxidation are isopropylbenzene peroxidating
Hydrogen；Patent EP0673907 oxidation of isobutane is tert-butyl hydroperoxide；Patent US4269805 cyclohexane oxidation is cyclohexyl mistake
Hydrogen oxide, xylene oxygen turn to aromatic alcohol etc. and are all made of bubbling reactor.This is because organic matter liquid phase oxidation reaction is slow anti-
It answers, generally requires the residence time of a few hours or ten a few hours, thus it is suitable for using bubbling reactor.
Since bubbling reactor liquid phase axial backmixing phenomenon is serious, under continuous operation type bubbling reactor reaction rate is obvious
Drop, is difficult to reach higher liquid-phase conversion rate in single-reactor.Such as in the patent US4066706 of Halcon company, the U.S.
The reactor of the ethylbenzene oxidation ethylbenzene hydroperoxide of report is using 8 reaction compartments series connection, the patent of Nobel company, the U.S.
The reactor that the xylene oxygen reported in US4269805 turns to aromatic alcohol uses 3-6 compartment.Cumene oxidation preparing isopropylbenzene
The reactor of hydrogen peroxide uses 3-4 grades of series connection.
In addition, being the reaction of organic matter hydrogen peroxide for oxidation operation, the oxygen of high concentration wishes have with low concentration
Machine object hydrogen peroxide contacts and high-enriched organics hydrogen peroxide is contacted with the oxygen of low concentration, advantageously reduces organic matter mistake
The decomposition of hydrogen oxide and excessive oxidation improve the selectivity of organic matter hydrogen peroxide.This " isopropylbenzene production benzene write in Cao Gang
Phenol propyl benzene " a book P182-183 is discussed in detail.
From the above Several Analysis, oxidation operation is that organic matter hydrogen peroxide is applicable in using piston flow reactor, but is bubbled
Each chamber of reactor is but closer to complete mixing flow, and which results in the poor efficiency of bubbling reactor and organic matter hydrogen peroxide
Low selectivity.
By taking the horizontal bubbling reactor for ethylbenzene hydroperoxide production of US4066706 report as an example, in single chamber
Liquid flow there is velocity head in the horizontal direction, as shown in Figure 1, liquid phase is close due in ethylbenzene liquid-phase oxidation reactor
Degree is usually higher by 100 ~ 200 times than density of gas phase, thus the indoor bubble distribution of single chamber will be by the tight of even in liquid phase
Ghost image is rung, as shown in Figure 2.
Also will lead to when bubble distribution is uneven another as a result, due to close to entry zone bubbles volume it is few, gas holdup
Low, the density in the region is big, forms density contrast with attachment material, this density contrast will push the local circulation in bubbling area, make
At local retention area, the oxidation solution residence time in stagnant area will be significantly increased, and which results in points of organic matter hydrogen peroxide
Solution rate increases, and reduces the selectivity of organic matter hydrogen peroxide；In addition, more in the bubble close to exit region, gas holdup is high, close
Spend small, the region that the resistance specific density in the region is big is smaller, and liquid phase is more prone to flow out from the region, causes the stream in the region
Amount is higher than other regions, and it reduce the residence times that liquid phase flows through the region, in turn result in the liquid phase for flowing through entire reactor
Residence time is not identical, influences the conversion ratio and selectivity of reaction.
In addition, from circular section, the patent of typical design such as Shell Internationale Research Maatschappij B.V
It is reported in CN200580028895, Gas distribution pipe is set to reactor bottom area, and height of liquid layer is different on every Gas distribution pipe,
Pressure outside every Gas distribution pipe is also different, which results in the Gas distribution of gas distributor is uneven, is formed on circular section
Circulation, such as Fig. 3.
The problem of in order to reduce back-mixing, the patent CN106554298 of Wanhua Chemical Group Co., Ltd. is using vertical
Bubbling column reactor is used for ethylbenzene liquid phase oxidation ethylbenzene hydroperoxide, and this pattern is effectively improved liquid phase axial backmixing, but
Radial back-mixing is still without proposing solution, in addition, this pattern causes the serial operation of gas phase, with what is reported in patent
10 order reaction piecewise analysis, pressure drop of the gas phase in reactor are 10 times higher than the pressure drop of horizontal single-stage gas distribution pattern in parallel, this
The operating cost of commercial plant greatly improved.
Summary of the invention
For above-mentioned bubbling reactor back-mixing problem, the utility model proposes a kind of efficient plug flow blistering reactions
Device improves its selectivity to reduce the decomposition reaction of organic matter hydrogen peroxide.
To achieve the above object, the technical solution of the utility model are as follows:
A kind of horizontal efficient plug flow bubbling reactor is in horizontal tubular structure, and the reactor body both ends are set respectively
Have inlet port and outlet port, it is characterised in that: including at least a set of partition group, every set partition group include outlet partition plate and entrance every
Plate, the partition group is successively spaced setting along the stream flow direction of the feed inlet to discharge port, and forms multiple connections
Reaction member；
Every set partition group middle outlet partition lower end is fixedly connected with reactor body bottom；Entrance partition and reactor
Inner body wall is fixedly connected, and the bottom of entrance partition and reactor body, top, spaced between outlet partition plate；Institute
The upper end level for stating entrance partition is higher than the upper end level of outlet partition plate；
Each reaction member is equipped with gas distributor, and the gas distributor includes main distributor and arch distribution
Device, the main distributor is horizontally disposed and there are logistics corridor, the corresponding distributions of the arch distributor with reactor body bottom
In the arch area of reactor body two sides；The gas phase that corresponding gas distributor is equipped with gas phase entrance and is located at the top of reactor body
Outlet；
Have row's fluid inlet deflector close to main distributor location arrangements in each reaction member, the liquid phase into
Mouth baffle quantity is several and places in vertical；
A drain, which is equipped with, close to the outlet height position of outlet partition plate in each reaction member mutually exports deflector, institute
If stating liquid-phase outlet baffle quantity dry doubling to place in vertical；
The feed inlet of the reactor body is connected with the logistics corridor of the main distributor lower end of adjacent reaction unit.
As further improvement of the utility model are as follows: the gap length between the adjacent fluid inlet deflector is
0.2-1.0m.Gap length between fluid inlet deflector is different according to the length of reaction member, but relative spacing is long
Degree control can be used for balancing liquid phase in the horizontal velocity head of entrance side in 0.2-1.0m, it is ensured that the uniformity of liquid phase assignment of traffic.
As further improvement of the utility model are as follows: the fluid inlet deflector is located on main distributor, and with
Corresponding liquid-phase outlet deflector is connected to form one piece of bubbling deflector.The differentiation of large-scale blistering reaction can be divided into so each
Parallel small bubbling reaction zone, completely eliminates the enlarge-effect of bubbling area.
As further improvement of the utility model are as follows: the drain in each reaction member mutually exports deflector institute
The upper outlet height for being not less than corresponding outlet partition plate along height, can balance each reaction member pressure in this way, guarantee object
The flow rate of stream improves its selectivity.
As further improvement of the utility model are as follows: along the flow direction of the logistics, liquid phase goes out in each reaction member
Upper along highly reducing step by step where mouth deflector, to form the liquid phase potential difference of each reaction member, the phase difference is to liquid phase stream
It is dynamic to provide energy, to ensure liquid phase steady flow in each reaction member.
As further improvement of the utility model are as follows: the height of the outlet partition plate is the 60- of reactor body height
80%, and reduce step by step, to balance each reaction member pressure, while it ensure that suitable liquid holdup and liquid in each reaction equation
The phase residence time prevents the circulation in horizontal direction, causes horizontal direction back-mixing.
Compared with the horizontal bubbling reactor of tradition, the reactor innovative point of the utility model is:
1, reactor is equipped with fluid inlet deflector and liquid-phase outlet deflector, for liquid phase to be flowed into reactor and outflow
The horizontal velocity head of reactor turns to, and horizontal kinetic energy when passing in and out reaction zone so as to avoid liquid phase influences the equal of blistering reaction area
Even property, prevents the circulation in horizontal direction, causes horizontal direction back-mixing；
2, the gas distributor in reactor is equipped with horizontally disposed main distributor, and there are there are logistics to lead in its lower end
Road, this makes the more uniform stabilization of bubble distribution for the bubbling main reaction region to be formed, avoids distributor pipe cloth in reactor bottom
It is uneven caused by when arch area；
3, reactor is equipped with arch distributor, and for being bubbled in reactor arch area, the gas for increasing arch area liquid contains
Rate, balance arch area and the density contrast for being bubbled main reaction region, prevent the circulation back-mixing on circular section；
4, reactor takes full advantage of arcuate region, and utilization rate is higher, and liquid phase flow pattern is closer to plug flow, oxidation operation
Side reaction it is less, reduce the excessive oxidation of organic matter hydrogen peroxide, the selectivity of target product organic matter hydrogen peroxide is more
It is high.
Detailed description of the invention
Fig. 1: the liquid phase basic flow field schematic diagram in traditional reactor；
Fig. 2: bubble distribution and circulation schematic diagram in traditional reactor；
Fig. 3: bubble distribution and back-mixing schematic diagram on traditional reactor circular section；
Fig. 4: the structural schematic diagram of 1 reactor of the utility model embodiment；
Fig. 5: the reaction member structural schematic diagram of the utility model embodiment 1；
Fig. 6: the structural schematic diagram of bubble distributer in the utility model reactor；
Fig. 7: the utility model reactor applies to the test structure schematic diagram of ethylbenzene oxidation ethylbenzene hydroperoxide；
Fig. 8:.The reaction member structural schematic diagram of the utility model embodiment 3；
In attached drawing: 1, reactor body；2, fluid inlet deflector；3, gas distributor；3-1, main distributor；3-2, bow
Shape distributor；4, feed inlet；5, liquid-phase outlet deflector；6, gas phase entrance；7, gaseous phase outlet；8, outlet partition plate；9, entrance every
Plate；10, discharge port；11, liquid phase guiding region；12, blistering reaction area；13, gas phase zone；14, descending liquid area；15, it is bubbled deflector.
Specific embodiment
In order to make those skilled in the art better understand the scheme of the utility model, below in conjunction with the utility model reality
The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described.
Embodiment 1
As shown in Figure 4: it is a horizontal bubbling reactor that the reactor that the present embodiment is related to, which is formally seen, suitable for having
The oxidation reaction of machine object and oxygen-containing gas, circular in cross-section structure；Three sets of partition groups are equipped in reactor body 1, often
Set partition group includes outlet partition plate 8 and entrance partition 9, and reactor body is separated to form the reaction of four connections by three sets of partition groups
Unit；1 both ends of reactor body are respectively equipped with feed inlet 4 and discharge port 10；First reaction member is connected to feed inlet 4, most
The latter reaction member end is equipped with outlet partition plate, is connected after material flows out outlet partition plate with discharge port 10；
As shown in Figure 4 and Figure 5, every 8 lower end of set partition group middle outlet partition is fixedly connected with 1 bottom of reactor body；Enter
Mouth partition 9 is fixedly connected with reactor body inner wall, and bottom, the top, outlet partition plate 8 of entrance partition 9 and reactor body 1
Between it is spaced；The upper end level of entrance partition 9 is higher than the upper end level of outlet partition plate 8；The top of entrance partition 9 is equipped with
Interval, to balance each reaction member pressure；Lower part interval, that is, notch of entrance partition 9 is that reaction liquid phase enters next reaction list
The import of member, and the interval between outlet partition plate 8 and entrance partition 9 then forms the connection of the logistics in reaction process passageway, as
" descending liquid area ".In the reaction cell, when the height of outlet partition plate 8 determines that liquid holdup and liquid phase in each reaction member stop
Between, the height of the utility model middle outlet partition 8 used is the 60 ~ 80% of reactor body cross-sectional diameter, is gone out in the present embodiment
The height of mouth partition is selected as the 70% of reactor body cross-sectional diameter.
As shown in Figures 4 to 6, each reaction member is equipped with gas distributor 3, and gas distributor 3 includes main distributor 3-1
With arch distributor 3-2, main distributor 3-1 is horizontally disposed and there are logistics corridors to form " liquid phase with reactor body bottom
Guiding region 11 "；Logistics corridor is directly connected with the feed inlet of reactor body 4 in first reaction member.3-2 pairs of arch distributor
It should be distributed in the arch area of reactor body two sides, the setting of arch distributor 3-2 is downward for balancing the liquid in arch area
Flowing forms the velocity head of circulation；The gas phase that corresponding gas distributor is equipped with gas phase entrance 6 and is located at the top of reactor body goes out
Mouth 7.
As shown in Figure 4 and Figure 5, row's fluid inlet leads close to main distributor 3-1 location arrangements in each reaction member
Flowing plate 2,2 quantity of fluid inlet deflector is several and places in vertical.In the present embodiment, the fluid inlet deflector 2
Be located at the lower section of main distributor 3-1, between adjacent fluid inlet deflector 2 between be divided into 0.2-1.0m, be spaced in the present embodiment
For 0.5m.The setting of fluid inlet deflector 2 is for balancing liquid phase in the horizontal velocity head of entrance side, it is ensured that liquid phase assignment of traffic
Uniformity.
As shown in Figure 4 and Figure 5, a drain phase is equipped with close to the outlet height position of outlet partition plate 8 in each reaction member
Deflector 5 is exported, if 5 quantity dry doubling of the liquid-phase outlet deflector is placed in vertical；In the present embodiment, liquid-phase outlet deflector
The height of reaction member outlet partition plate 8 where height is slightly above where 5 upper ends.In the present embodiment, the reaction zone of liquid phase and gas phase
Between formed " blistering reaction area 12 ", and on blistering reaction area 12 then be " gas phase zone 13 ".The setting of liquid-phase outlet deflector 5 is used
Transition is separated with the liquid of blistering reaction area vertical upflow in the liquid for flowing deflector top horizontal, to guarantee liquid phase
The even flow field of deflector lower area is exported, guarantees that gas-liquid two-phase can be uniformly distributed, so that it is guaranteed that oxidation reaction effect.This
In embodiment, liquid-phase outlet deflector 5 be it is not contour, height reduces step by step along each reaction member, to form each chamber
The liquid phase potential difference of room bubbling area, which provides energy to liquid phase flowing, to ensure liquid phase steady flow in each chamber.
Interval is different according to the length of reaction member between liquid-phase outlet deflector 5, but preferred 0.2-1.0m, in the present embodiment
Between be divided into 0.5m.
As shown in Figure 4 and Figure 5, in this reactor body, for gas behind blistering reaction area 12 and liquid phase reactor, unreacted is complete
Gas enter gas phase zone 13, in gas phase zone 13, the gas phase zone of each reaction member is connection, this is for balancing each reaction
The pressure of unit.
As shown in Figure 4 and Figure 5, descending liquid area 14 be used to for the liquid-phase product of previous reaction member being sent into latter reaction member with
The reaction was continued.
As shown in Figure 4 and Figure 5, fluid inlet deflector 2 and liquid-phase outlet deflector 5, which are provided separately, can reduce equipment throwing
Money, reduces the complexity of design.
Embodiment 2
According to structure shown in embodiment 1, the present embodiment has manufactured test reactor, and the structure size of the reactor is shown in
Table 1:
| Project | Size |
| Diameter D | 300 mm |
| Separate unit length (cylinder) H | 1370 mm |
| Numbe rof reactor unit | 4 |
| Reaction member length | 275 mm |
| Bubbling area height | 150mm |
| Gas distributor height | 60mm |
Table 1: 2 reactor key dimension table of embodiment
It is as shown in Figure 7: the reactor is used in the test of ethylbenzene oxidation ethylbenzene hydroperoxide, constructs reaction system,
Ethylbenzene feed flow is 35kg/h, and air feed rate 2.06m3/h, nitrogen feed flow is 1.26m3/h, to oxygen after reaction
Change liquid to be analyzed, calculates the conversion ratio of ethylbenzene and the selectivity of ethylbenzene hydroperoxide.
As shown in Figure 5, Figure 7, the process of embodiment 2 is that ethylbenzene raw material enters the first reaction member of oxidation reactor, via
After fluid inlet deflector, it is evenly distributed on reaction member bottom, and flow up, it is oxygenous with being bloated in gas distributor
Haptoreaction is steeped, ethylbenzene hydroperoxide is generated, bubble and liquid continue up flowing, after liquid-phase outlet deflector, bubble
It escapes up and enters gas phase zone, via gaseous phase outlet outflow reactor；Liquid phase is then to outlet after the outflow of liquid-phase outlet deflector
Partition bottom horizontal flow sheet enters descending liquid area, into next reaction member；In next reaction member, repeat the above steps, liquid phase by
A reaction member tandem reaction, after four reaction members, into second reactor.In second reactor, oxidation
After liquid continues through the reaction of four reaction members, flowed out from reactor.
Referring to Fig. 5, Fig. 7, the present embodiment uses fluid inlet deflector, liquid-phase outlet deflector, main distributor and bow
Shape distributor effectively prevents backmixing of liquid phase, and liquid phase is in flat-pushing flow pattern, reduces the excessive oxidation of ethylbenzene hydroperoxide, improves
The selectivity of ethylbenzene hydroperoxide.
It is anti-that the reactor of the utility model embodiment 2 with traditional reactor is respectively used to ethylbenzene oxidation ethylbenzene hydroperoxide
It answers, performance is relatively shown in Table 2.
2 embodiment reactor of table is compared with the horizontal bubbling reactor performance of tradition
Embodiment 3
As shown in Figure 8.On the basis of where embodiment 1, fluid inlet deflector 2 is placed in above main distributor 3-1, and
One piece of bubbling deflector 15 is connected to form with corresponding liquid-phase outlet deflector 5.
The present embodiment reactor merges fluid inlet deflector 2 with liquid-phase outlet deflector 5 for diversion effect
Large-scale bubbling reactor can be separated into each parallel small bubbling area by being bubbled deflector 15 for same, completely eliminate bubbling
The enlarge-effect in area.
The above is only the preferred embodiments of the utility model, are not intended to limit the scope of the patents of the utility model, although ginseng
The utility model is described in detail according to previous embodiment, for coming for those skilled in the art, still may be used
To modify to technical solution documented by aforementioned each specific embodiment, or part of technical characteristic is carried out equivalent
Replacement.All equivalent structures done using the utility model specification and accompanying drawing content, are directly or indirectly used in other phases
The technical field of pass, similarly within the utility model patent protection scope.
Claims (6)
1. a kind of horizontal efficient plug flow bubbling reactor is in horizontal tubular structure, the reactor body both ends are respectively equipped with
Inlet port and outlet port, it is characterised in that: including at least a set of partition group, every set partition group include outlet partition plate and entrance every
Plate, the partition group is successively spaced setting along the stream flow direction of the feed inlet to discharge port, and forms multiple connections
Reaction member；Every set partition group middle outlet partition lower end is fixedly connected with reactor body bottom；Entrance partition with react
Device inner body wall is fixedly connected, and the bottom of entrance partition and reactor body, top, spaced between outlet partition plate；
The upper end level of the entrance partition is higher than the upper end level of outlet partition plate；Each reaction member is equipped with gas distributor,
The gas distributor includes main distributor and arch distributor, the main distributor it is horizontally disposed and with reactor body bottom
There are logistics corridor, the corresponding arch area for being distributed in reactor body two sides of the arch distributor；Corresponding gas distributor is set
The gaseous phase outlet for having gas phase entrance and being located at the top of reactor body；Close to main distributor position cloth in each reaction member
It is equipped with row's fluid inlet deflector, the fluid inlet baffle quantity is several and places in vertical；Each reaction is single
A drain is equipped with close to the outlet height position of outlet partition plate in member and mutually exports deflector, if the liquid-phase outlet baffle quantity
Dry doubling is placed in vertical；The logistics corridor phase of the feed inlet of the reactor body and the main distributor lower end of adjacent reaction unit
Even.
2. a kind of horizontal efficient plug flow bubbling reactor according to claim 1, it is characterised in that: the adjacent liquid phase
Gap length between import deflector is 0.2-1.0m.
3. a kind of horizontal efficient plug flow bubbling reactor according to claim 1, it is characterised in that: the fluid inlet
Deflector is located on main distributor, and is connected to form one piece of bubbling deflector with corresponding liquid-phase outlet deflector.
4. a kind of horizontal efficient plug flow bubbling reactor according to claim 1, it is characterised in that: each reaction
A drain in unit mutually exports the upper outlet height for being not less than corresponding outlet partition plate along height where deflector.
5. a kind of horizontal efficient plug flow bubbling reactor according to claim 1, it is characterised in that: along the logistics
Flow direction, upper where liquid-phase outlet deflector reduces step by step along height in each reaction member.
6. a kind of horizontal efficient plug flow bubbling reactor according to claim 1, it is characterised in that: the outlet partition plate
Height be reactor body height 60-80%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920102966.4U CN209490803U (en) | 2019-01-22 | 2019-01-22 | A kind of horizontal efficient plug flow bubbling reactor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920102966.4U CN209490803U (en) | 2019-01-22 | 2019-01-22 | A kind of horizontal efficient plug flow bubbling reactor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109589880A (en) * | 2019-01-22 | 2019-04-09 | 常州瑞华化工工程技术股份有限公司 | A kind of horizontal efficient plug flow bubbling reactor |
| CN110743486A (en) * | 2019-12-06 | 2020-02-04 | 东华工程科技股份有限公司 | Synthesis reactor for oxamide |
| CN114213566A (en) * | 2021-11-28 | 2022-03-22 | 宁波利万新材料有限公司 | Continuous SAN resin production method based on plug flow reactor |
| CN114733451A (en) * | 2022-04-15 | 2022-07-12 | 青岛科技大学 | Continuous gas-liquid reaction device with adjustable residence time |
-
2019
- 2019-01-22 CN CN201920102966.4U patent/CN209490803U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109589880A (en) * | 2019-01-22 | 2019-04-09 | 常州瑞华化工工程技术股份有限公司 | A kind of horizontal efficient plug flow bubbling reactor |
| CN109589880B (en) * | 2019-01-22 | 2023-09-19 | 常州瑞华化工工程技术股份有限公司 | Horizontal high-efficiency plug flow bubbling reactor |
| CN110743486A (en) * | 2019-12-06 | 2020-02-04 | 东华工程科技股份有限公司 | Synthesis reactor for oxamide |
| CN114213566A (en) * | 2021-11-28 | 2022-03-22 | 宁波利万新材料有限公司 | Continuous SAN resin production method based on plug flow reactor |
| CN114733451A (en) * | 2022-04-15 | 2022-07-12 | 青岛科技大学 | Continuous gas-liquid reaction device with adjustable residence time |
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