CN100522897C - Cyclohexane oxidation reactor - Google Patents
Cyclohexane oxidation reactor Download PDFInfo
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- CN100522897C CN100522897C CNB2004100002319A CN200410000231A CN100522897C CN 100522897 C CN100522897 C CN 100522897C CN B2004100002319 A CNB2004100002319 A CN B2004100002319A CN 200410000231 A CN200410000231 A CN 200410000231A CN 100522897 C CN100522897 C CN 100522897C
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Abstract
A cyclohexane oxidizing reactor is composed of casing, gas-liquid separating segment, straight reacting segment, gas-liquid separator, preheater, liquid pump, compressor, gas distributors, and filler layers between gas distributors. Its advantages are uniform mixing between cyclohexane and O2, and high productivity.
Description
Technical field
The present invention relates to a kind of chemical reaction synthesis device, especially for the oxidizing reaction of hexanaphthene.By reaction zone, oxygen-containing gas flows through reaction zone by bubbling mode and liquid phase hexanaphthene uniform mixing to liquid material jointly with the plug flow flowing mode.
Background technology
The oxidizing reaction of hexanaphthene is a typical gas-liquid two-phase reaction, or gas-liquid-solid phase reaction, but the gas-liquid two-phase oxidizing reaction mainly occurs in the liquid phase body.Its principal element that influences oxidizing reaction generation speed has two, promptly oxygen between gas-liquid two-phase mass transfer velocity and liquid phase in oxidizing reaction speed.The current bubbling reactor that generally all adopts band to stir is realized the oxidizing reaction of hexanaphthene.This class reactor can quicken backmixing of liquid phase, can reduce or eliminate the resistance to mass transfer between the gas-liquid two-phase, thereby plays the effect of fast reaction speed.But also there is following deficiency in this class reactor in the production actual procedure:
1, the energy consumption that realizes stirring operation is than higher, and maintenance and repair are also difficult, so increased production cost;
2, according to the response characteristic of hexanaphthene, backmixing of liquid phase is a significant adverse.This is that the oxidation products of hexanaphthene is easier to be more oxidized than hexanaphthene itself because in oxidation reaction zone.Backmixing of liquid phase can increase the residence time of oxidation products in reaction zone, thereby also can make the further oxidation of more oxidation target product, has reduced the selectivity of cyclohexane oxidation.
According to above-mentioned deficiency, the application has created the design of reactor intake method and gas distributor, and some internals that increased reactor, has overcome the deficiency of located by prior art, has reduced running cost, has improved the output of oxidation target product.
Summary of the invention
According to background technology, the object of the present invention is to provide a kind of oxidation reactor that is used for cyclohexane oxidation, it does not adopt the agitator of commonly using, and adopt liquid material to pass through reaction zone with plug flow mode, oxygen containing gas with bubbling mode and liquid phase hexanaphthene uniform mixing, flows through reaction zone by gas distributor jointly.The reactor energy consumption of form is lower like this, high efficiency, and cost is low, and working service is repaired simple and easy.
To achieve these goals, the present invention is achieved through the following technical solutions:
A kind of cyclohexane oxidation device, mainly by housing (1), gas-liquid separation section (2), straight tube conversion zone (3), gas-liquid separator (4), preheater (5), liquid pump (6), compressor (7) is formed, wherein: housing (1) is vertical straight barrel type structure, its upper end be the gas-liquid separation section (2) of enlarged diameter, under gas-liquid separation section (2) be straight tube conversion zone (3) up to the bottom, its directly the slenderness ratio H/D of a conversion zone should be 4-8; Make progress from the bottom, more than one side gas feed (12) can be set, within straight tube conversion zone (3) gas distributor (13) being set is connected with gas feed (12), each gas feed (12) gathers the back by admission passage (14) and is connected with compressor (7), gas distributor (13) is separated into a plurality of reaction zones (31) with straight tube conversion zone (3), and the height W of reaction zone (31) is about (3-6) D; In straight tube conversion zone (3), be provided with the internals packing layer (11) of voidage and the big characteristics of specific surface area; In straight tube conversion zone (3) bottom liquid exit (17) is set, at the top of gas-liquid separation section (2) gas-liquid separation section pneumatic outlet (21) is set, by pipeline (16) and gas-liquid separator (4), preheater (5) is connected with liquid pump (6), liquid pump (6) is connected with housing (1) bottom liquid import (61) by pipeline, in housing (1) bottom support (15) is installed.
Owing to adopted technique scheme, the present invention to have following advantage and effect:
1, the present invention saves stirring operation, thereby has saved energy consumption and process cost, and the maintenance and repair expense, has reduced the cost of product;
2, the present invention makes liquid phase pass through reaction zone with plug flow mode by loading the internals that dumped packing, structured packing, screen etc. have voidage and the big characteristics of specific surface area at reaction zone.Compared with prior art, oxidation products shortened in the residence time of reaction zone, thereby had improved the oxidation target product yield.
3, the present invention can make gas form uniform small bubbles in reaction zone by the design to inlet pipe and gas distributor.And suitably improve reaction zone pressure, than the high about 2～4bar of prior art pressure.Can improve the mass transfer velocity between the gas-liquid two-phase like this, remedy because the influence of saving the mass transfer velocity aspect of being brought behind the stirring operation.
4, liquid phase is approximate complete mixing flow in the prior art, so oxidation products concentration can be considered homogeneous in the liquid phase material, liquid phase is a plug flow among the present invention, oxidation products concentration can form the gradient of certain rule in the liquid phase material along reaction zone, so can be by the air input in control each section reaction zone, the oxidation products concentration in the liquid phase material and the molecular oxygen content in the gas phase are complementary in this section reaction zone and make.In general, oxidation products concentration increases progressively along reaction zone in the liquid phase material, and molecule keto concentration then successively decreases along reaction zone in the gas phase.Facts have proved that such method can improve target product yield.
Description of drawings
Fig. 1 is a structure collectivity cross-sectional schematic of the present invention
Fig. 2 is the overall cross-sectional schematic of first embodiment of the invention
Fig. 3 is the overall cross-sectional schematic of second embodiment of the invention
Among the figure: 1-housing, 11-packing layer, 12-gas feed, 13-gas distributor, the 14-admission passage, 15-support, 16-pipeline, the 17-liquid exit, 2-gas-liquid separation section, 21-gas-liquid separation section pneumatic outlet, the straight tube of 3-conversion zone, 4-gas-liquid separator, 41-water out, the 42-air outlet, 5-preheater, 6-liquid pump, the 61-liquid-inlet, 7-compressor, the import of 71-oxygen-containing gas
Embodiment
Illustrated by Fig. 1, a kind of cyclohexane oxidation device is mainly by housing 1, gas-liquid separation section 2, straight tube conversion zone 3, gas-liquid separator 4, preheater 5, liquid pump 6, compressor 7 is formed, and wherein: housing 1 is vertical straight barrel type structure, and its upper end is the gas-liquid separation section 2 of enlarged diameter, under gas-liquid separation section 2 be straight tube conversion zone 3 up to the bottom, the slenderness ratio H/D of its straight tube conversion zone should be 4-8; Make progress from the bottom, more than one side gas feed 12 can be set, within straight tube conversion zone 3 gas distributor 13 being set is connected with gas feed 12, each gas feed 12 gathers the back by admission passage 14 and is connected with compressor 7, three gas distributors 13 are set straight tube conversion zone 3 is separated into three reaction zones 31, the height W of reaction zone 31 is about 3-6D; In straight tube conversion zone 3, be provided with the internals packing layer 11 of voidage and the big characteristics of specific surface area; In straight tube conversion zone 3 bottoms liquid exit 17 is set, gas-liquid separation section pneumatic outlet 21 is set at the top of gas-liquid separation section 2, by pipeline 16 and gas-liquid separator 4, preheater 5 is connected with liquid pump 6, liquid pump 6 is connected with housing 1 bottom liquid import 61 by pipeline, in housing 1 bottom support 15 is installed.
As can be known, the slenderness ratio H/D value of the straight tube conversion zone 3 of reactor generally is controlled at H/D=4-8, and such numerical value can reduce the mixing when mobile of liquid phase material in the conversion zone.
Packing layer 11 can adopt dumped packing, structured packing, and screen etc., its specific surface area α should be 200-1500, and voidage ε should be 0.90-0.98, and total degree of filling that packing layer 11 is full of straight tube conversion zone 3 should be straight tube conversion zone 3 volumetrical 30% one 80%.
By controlling the air input of each intake ducting, can control in every section reaction zone molecular oxygen content in the gas phase, the oxidation products concentration in the liquid phase material and the molecular oxygen content in the gas phase are complementary in this section reaction zone and make.
The structured material of housing 1 of the present invention and internals thereof should be able to bear 200 ℃ temperature, and the energy works better, and the pressure of (10-15) bar should be able to be born in conversion zone inside simultaneously.
Know that again pressure and temperature must match each other, make to be reflected at each and constantly all to occur in the liquid phase.Temperature in the straight tube conversion zone 3 can be an isostatic, employing is along the conversion zone gradient of axially lowering the temperature, temperature evenly falls progressively to the bottom from conversion zone top, and temperature head is about 3 ℃-10 ℃, the inductive phase of adopting the cooling sequence to help improving the selectivity of target product and shorten cyclohexane oxidation.
Working process of the present invention is as described below:
With liquid pump 6 the 5L hexanaphthene is squeezed among the present invention of the about 5L of effective volume.The air of coming from compressor 7 enters straight tube conversion zone 3 with the amount of 1.5L/min, and its temperature is 150 ℃, and pressure is 1Mpa.Tail gas enters gas-liquid separator 4 from gas-liquid separation section pneumatic outlet 21, and the hexanaphthene that condenses is Returning reactor after preheater 5 preheatings, enters straight tube conversion zone 3 again and continues oxidation.Water in the gas-liquid separator 4 flows out from water out 41.React stopped reaction after 4 hours, the cooling back emits oxidation products and a large amount of not oxidized hexanaphthene from liquid exit 17, and merges a place with 4 li remaining hexanaphthenes of gas-liquid separator, obtains the 5L mixed solution.
Shown in reference line among the figure, the hexanaphthene after the oxidation also can be gone into condenser from the 2 lateral opening overflows of gas-liquid separation section, and flows out from exporting 17.
Fig. 2 illustrates first embodiment of the invention, straight tube conversion zone 3 is separated into three reaction zones 31 by three gas distributors 13, leave certain space each gas distributor 13 upper and lower, so that the oxygen-containing gas that enters reaction zone 31 is evenly discharged, each gas distributor 13 is connected with compressor 7 by admission passage 14, remaining space all is full of packing layer 11, and the height that the sum total of packing layer 11 length accounts for straight tube conversion zone 3 is about 70%.
Fig. 3 illustrates second embodiment of the invention, is provided with a gas distributor 13 in the bottom of straight tube conversion zone 3, and is connected with compressor 7 by admission passage 14.Straight tube conversion zone 3 on gas distributor 13 all is set to packing layer 11.The upper and lower certain space that leaves at gas distributor 13.The height of packing layer 11 accounts for 77% of straight tube conversion zone 3 height.
Claims (3)
1, a kind of cyclohexane oxidation device, mainly by housing (1), gas-liquid separation section (2), straight tube conversion zone (3), gas-liquid separator (4), preheater (5), liquid pump (6), compressor (7) is formed, it is characterized in that: housing (1) is vertical straight barrel type structure, its upper end be the gas-liquid separation section (2) of enlarged diameter, under gas-liquid separation section (2) be straight tube conversion zone (3) up to the bottom, its directly the slenderness ratio H/D of a conversion zone be 4-8; Make progress from the bottom, more than one side gas feed (12) is set, within straight tube conversion zone (3) gas distributor (13) being set is connected with gas feed (12), each gas feed (12) gathers the back by admission passage (14) and is connected with compressor (7), gas distributor (13) is separated into a plurality of reaction zones (31) with straight tube conversion zone (3), and the height W of reaction zone (31) is (3-6) D; In straight tube conversion zone (3), internals packing layer (11) is set, packing layer (11) specific surface area α is 200-1500, voidage ε is 0.90-0.98, packing layer (11) adopts dumped packing, structured packing or screen, total degree of filling that packing layer (11) is full of straight tube conversion zone (3) is straight tube conversion zone (3) volumetrical 30%-80%, in straight tube conversion zone (3) bottom liquid exit (17) is set, at the top of gas-liquid separation section (2) gas-liquid separation section pneumatic outlet (21) is set, by pipeline (16) and gas-liquid separator (4), preheater (5) is connected with liquid pump (6), liquid pump (6) is connected with housing (1) bottom liquid import (61) by pipeline, in housing (1) bottom support (15) is installed.
2, cyclohexane oxidation device according to claim 1 is characterized in that: the upper and lower at each gas distributor (13) all is installed with the space.
3, cyclohexane oxidation device according to claim 1, it is characterized in that: a gas distributor (13) is set in straight tube conversion zone (3) bottom, all be set to packing layer (11) thereon, and be installed with the space in the upper and lower of gas distributor (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100002319A CN100522897C (en) | 2004-01-09 | 2004-01-09 | Cyclohexane oxidation reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100002319A CN100522897C (en) | 2004-01-09 | 2004-01-09 | Cyclohexane oxidation reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1556078A CN1556078A (en) | 2004-12-22 |
| CN100522897C true CN100522897C (en) | 2009-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004100002319A Expired - Fee Related CN100522897C (en) | 2004-01-09 | 2004-01-09 | Cyclohexane oxidation reactor |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102000532B (en) * | 2010-10-28 | 2013-08-14 | 中国石油化工股份有限公司 | Cyclohexane oxygen enrichment oxidizing condition kettle air intake method and device thereof |
| CN103055792B (en) * | 2013-01-25 | 2016-04-20 | 浙江曙扬化工有限公司 | A kind of using method of the vibration tubular reactor for cyclohexane liquid-phase oxidation |
| CN106552577B (en) * | 2015-09-30 | 2018-07-31 | 中国石油化工股份有限公司 | A kind of multilayer guide shell bubbling reactor and its application method |
| CN107778131B (en) * | 2016-08-25 | 2021-02-05 | 中国石油化工股份有限公司 | Method for preparing cyclohexanol and cyclohexanone based on multilayer double-loop flow guide cylinder bubble reactor |
| CN107778132B (en) * | 2016-08-25 | 2021-02-05 | 中国石油化工股份有限公司 | Method for preparing cyclohexanol and cyclohexanone based on multilayer guide cylinder bubble reactor |
| CN108380141A (en) * | 2018-03-16 | 2018-08-10 | 安丽华 | Bubbling bed reactor, methyl methacrylate production equipment |
| CN110124590A (en) * | 2019-06-22 | 2019-08-16 | 栎安化学(上海)有限公司 | A kind of production equipment and its technique of 3- chlorpromazine chloride |
| CN113683545B (en) * | 2021-08-31 | 2023-06-27 | 南京延长反应技术研究院有限公司 | System and method for preparing cyclohexyl hydroperoxide by oxidizing cyclohexane |
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2004
- 2004-01-09 CN CNB2004100002319A patent/CN100522897C/en not_active Expired - Fee Related
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Granted publication date: 20090805 Termination date: 20120109 |