CN207019325U - Heat reclamation device is reacted during toluene liquid phase catalytic oxidation - Google Patents
Heat reclamation device is reacted during toluene liquid phase catalytic oxidation Download PDFInfo
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- CN207019325U CN207019325U CN201720925556.0U CN201720925556U CN207019325U CN 207019325 U CN207019325 U CN 207019325U CN 201720925556 U CN201720925556 U CN 201720925556U CN 207019325 U CN207019325 U CN 207019325U
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Abstract
The utility model discloses a kind of retracting device of reaction heat during toluene liquid-phase air oxidation, reaction heat reclamation device also includes the built-in heat exchanger being arranged in reactor and the steam flash tank being arranged on outside reactor, one end of built-in heat exchanger is connected with the circulating hot water inlet and outlet of steam flash tank, the other end is connected with the overheat water entrance of steam flash tank, and circulating hot water regulation pump is provided between built-in heat exchanger and circulating hot water inlet and outlet；Overheat water regulating valve is provided between built-in heat exchanger and overheat water entrance；Steam gateway and cooling water supply port are further opened with steam flash tank, steam control valve is provided with steam gateway, moisturizing regulation pump is connected with cooling water supply port.The utility model device heat exchange efficiency is high, not only increases oxidation efficiency so that oxygen content in tail gas during normal reaction<0.5%, far above safety standard, and the demand that exchanged heat during different load can be met, suitable for the recuperation of heat of ton scale oxidation unit.
Description
Technical field
Reaction heat recovery technology field is the utility model is related to, in particular to anti-during a kind of toluene liquid phase catalytic oxidation
Answer heat reclamation device.
Background technology
It is a kind of typical radical reaction that toluene liquid phase catalytic oxidation, which prepares benzoic acid, can be released during reaction
Substantial amounts of heat.Recycling reaction heat generation steam can use as the insulation of device and in subsequent separation process, from
And production cost is reduced, energy resource consumption is reduced, reaches the purpose of energy-saving and emission-reduction.
At present, the method for preparing phenylformic acid through liquid phase oxidation of methylbenzene reaction recuperation of heat mainly has following several：1) reaction is passed through
The heat exchange recovery of device vapor condensation, condenser heat exchange area is very big needed for this mode, and substantial amounts of fixed gas can be led in reaction
Cause entrained liquid serious, numerous condensers and phase-splitter can be set to reach exhaust emission standard, auxiliary device is more, and structure is multiple
It is miscellaneous.2) heat recovery is realized by heat exchanger by reaction solution circulation again, this mode may require that spent material circulating pump, material
Circulating pump working media is reaction solution, wherein containing about 70% toluene and 30% benzoic acid, during using which, first
It is extremely inflammable and explosive during 160 DEG C of reaction solution tower outer circulation, and reaction solution specific heat is smaller, needs in theory more than water twice
Internal circulating load realizes heat recovery, and reaction solution has the temperature difference more than 5~10 DEG C after heat exchange, be circulated back to meeting after reactor
There is phenomenon of the heat absorption more than heat release so that reaction is unmanageable, or even " dead material " occurs, thus the safety and economy of this mode
Property is poor.3) heat recovery is realized by reactor jacket, jacket for heat exchange area is smaller, can cause reactor height using this mode
Footpath is than bigger than normal, thus reactor is difficult to be made very big.4) heat recovery is realized by reactor inner coil pipe, being common in small size back should
Device, numerous coil pipes can be caused to be difficult to fixed influence come pipe stress caused by avoiding temperature fluctuation when reactor is larger.Therefore, it is preceding
It is difficult to meet large-scale demand of industrial production to state recuperation of heat mode, therefore, ton oxidation unit scale is produced per year to reach,
It is generally necessary to which two or more foregoing heat exchange modes are combined carry out recuperation of heat, and then the equipment for resulting in the need for using is numerous, hot
Recovery process is complicated, is difficult safety economy ground the problems such as reclaiming reaction heat.
The content of the invention
The purpose of this utility model seeks to provide a kind of retracting device of reaction heat during toluene liquid-phase air oxidation,
The device can safely, it is economical, efficiently reclaim reaction heat, meet ton above large-scale industrial production recuperation of heat requirement.
To achieve the above object, the technical solution adopted in the utility model is：During a kind of toluene liquid phase catalytic oxidation
Heat reclamation device is reacted, including reactor, the reactor bottom are provided with air supply device, connected on the air supply device
There is air sparger, tail gas outlet is provided with the top of the reactor, the reaction heat reclamation device is also described including being arranged on
Built-in heat exchanger in reactor, and the steam flash tank being arranged on outside the reactor, the one of the built-in heat exchanger
Hold and be connected with the circulating hot water of steam flash tank inlet and outlet, the overheat water entrance of the other end and the steam flash tank
It is connected, circulating hot water regulation pump is provided between the built-in heat exchanger and circulating hot water inlet and outlet；It is described built-in
Overheat water regulating valve is provided between formula heat exchanger and the overheat water entrance；Steam is further opened with the steam flash tank
Gateway and cooling water supply port, steam control valve is provided with the steam gateway, is connected on the cooling water supply port
There is moisturizing to adjust pump.
Further, it is connected with demister between the steam gateway and steam control valve.
Further, between the built-in heat exchanger and circulating hot water regulation pump, it is provided with steam trap.
Further, it is connected with moisturizing regulating valve between the cooling water supply port and moisturizing regulation pump.
Further, the built-in heat exchanger is finned heat exchanger.
Further, the overheat water entrance and steam gateway are opened in the top of steam flash tank, described to follow
Ring hot water entrance and cooling water supply port are opened in steam flash pot bottom.
Compared with prior art, the utility model has advantages below：
It can be applied to during ton scale toluene liquid-phase air oxidation react first, the utility model provides one kind
The retracting device of heat so that recovery process is simple, can reclaim reaction heat safety economy.
Second, the retracting device of reaction heat not only increases oxidation during toluene liquid-phase air oxidation of the present utility model
Efficiency so that oxygen content in tail gas during normal reaction<0.5%, far above the ＜ 7% of safety standard, and can meet not
Exchange heat demand during with load；The utility model device heat exchange efficiency is high, can stablize, be economical, continuous, automatic operating, being applicable
In the recuperation of heat of ton scale oxidation unit.
Third, the heat transferring medium circulation pipe of the utility model built-in heat exchanger can be not only used for heating medium (water) recycle stream
Move heat, can also be used to introduce extraneous steam before oxidation reaction starts, to start oxidation reaction, and then cause the utility model
Device auxiliary device is few, simple and compact for structure, takes up space small.
Fourth, built-in heat exchanger of the present utility model uses finned heat exchanger, upper lift-off is persistently split using fin
Gas, increase gas liquid interfacial area, promote gas-liquid mass transfer, and then improve oxidation efficiency, reduce tail gas oxygen content, avoid explosive event
Appearance, significantly reduce security risk.Produced in addition, built-in heat exchanger of the present utility model sustainedly and stably removes reaction
Heat, while the steam that output grade is controllable makes temperature of reaction kettle constant, reduces influence of the temperature fluctuation to reaction.
Fifth, pressure of the utility model device using hot water governor valve control pipeloop outlet (overheat water inlet) place
In certain value, holding internal water is liquid, avoids superheated water and generation pneumatic hammer is vaporized in pipeline and heat exchanger, damage equipment.
Meanwhile moisturizing entrance is opened up on steam flash tank, moisturizing is carried out according to the size of gas production, maintains steam flash tank liquid level steady
It is fixed, and then maintain heat-exchange system stably to steam.
Sixth, overheat water inlet and steam gateway are opened in into steam flash tank top, hot water outlet and moisturizing are entered
Mouth is opened in steam flash pot bottom, further avoid the generation of pneumatic hammer；Moreover, on the steam gateway of steam flash tank
Demister is set, can effectively prevent that liquid level is too high and produces entrained liquid.
Brief description of the drawings
Fig. 1 is reaction heat reclamation device structural representation during a kind of toluene liquid phase catalytic oxidation.
Embodiment
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings, is easy to more clearly
The utility model is solved, but they do not form to the utility model and limited.
Heat reclamation device, including reactor 1, the bottom of reactor 1 are reacted during toluene liquid phase catalytic oxidation as shown in Figure 1
Portion is provided with air supply device 1.1, and air sparger 2 is connected with air supply device 1.1, and the top of reactor 1 is provided with tail gas row
Outlet 1.2, reaction heat reclamation device also includes the built-in heat exchanger 3 being arranged in reactor 1, and is arranged on outside reactor 1
Steam flash tank 5, built-in heat exchanger 3 is finned heat exchanger, and the top of steam flash tank 5 is provided with steam gateway 5.2, mistake
Hot water entrance 5.3 and relief valve connection 5.5, connect safety valve on relief valve connection 5.5, the bottom of steam flash tank 5 is provided with circulation
Hot water entrance 5.1 and cooling water supply port 5.4, one end of built-in heat exchanger 3 pass in and out with the circulating hot water of steam flash tank 5
Mouth 5.1 is connected, and the other end is connected with the overheat water entrance 5.3 of steam flash tank 5, built-in heat exchanger 3 and cycling hot
Circulating hot water regulation pump 6 is provided between water entrance 5.1, is provided between built-in heat exchanger 3 and circulating hot water regulation pump 6
Steam trap 7, circulating hot water are connected with outlet valve 13 before adjusting pump 6, and steam trap 7 is connected with hand-operated valve 14；Built-in heat exchanger 3 and mistake
Overheat water regulating valve 8 is provided between hot water entrance 5.3, the hot water regulating valve 8 is controllable to overheat pressure at water entrance 5.3
To keep internal water as liquid, prevent superheated water vaporizes in pipeline and heat exchanger from producing pneumatic hammer, damage equipment；Steam flash tank
Steam gateway 5.2 and cooling water supply port 5.4 are further opened with 5, steam control valve 10 is provided with steam gateway 5.2,
Demister 9 is connected between steam gateway 5.2 and steam control valve 10, the demister 9 is used to prevent the too high caused gas of liquid level
Liquid is carried secretly；Moisturizing regulation pump 11 is connected with cooling water supply port 5.4, between cooling water supply port 5.4 and moisturizing regulation pump 11
It is connected with moisturizing regulating valve 12.
The course of work of the retracting device of reaction heat is as follows during above-mentioned toluene liquid-phase air oxidation：By extraneous steam from
Steam gateway 5.2 is passed through steam flash tank 5, and extraneous steam enters built-in heat exchanger 3 through superheated water regulating valve 8, built-in
Heat exchanger 3 is connected in parallel and is immersed in reaction solution each other using multistage finned heat exchanger, built-in heat exchanger 3, to reaction
Kettle 1, which provides heat, starts toluene catalytic oxidation reaction, and caused steam condensate is discharged by steam trap 7；After reaction starts
Steam gateway 5.2 and steam trap 7 on steam off flash tank 5, start moisturizing regulation pump 11 and supplement cooling water, to maintain to change
Hot systems are stable, and it is 1 that cooling water, which is pressed with circulating hot water,:50~1:200 part by weight is filled into steam flash tank 5, passes through benefit
Water regulating valve 12 so that steam flash tank 5 reaches setting liquid level, and the liquid level is preferably 10~80%, more preferably 50% or so；
Air supply device 1.1 of the compressed air constantly from the bottom of reactor 1 enters, and rises by air sparger 2, simultaneous reactions kettle
Reactant in 1 releases a large amount of reaction heat, (now anti-as oxygen content ＜ 0.5% in the tail gas that tail gas outlet 1.2 is discharged
Answer the temperature of kettle 1 to reach the reaction temperature of toluene oxidation reaction, fully reacted between reactant) start circulating hot water regulation pump 6, water exists
Heat is absorbed in built-in heat exchanger 3 turns into superheated water, and superheated water dodges by there is the hot water regulating valve 8 of Stress control to enter steam
Steaming pot 5 is flashed, and produces steam, is opened steam and is drawn steam by steam gateway 5.2, and according to follow-up workshop section vapour demand
Suitable output steam pressure is set by steam control valve 10, preferably 0.10~0.50Mpa, the hot water and supplement after flash distillation is soft
Pump 6 is adjusted by circulating hot water after water mixing and enters cyclic absorption heat in built-in heat exchanger 3, is recycled back into steam flash
Steam is constantly produced in tank 5.Wherein, hot water regulating valve 8 controls pipeloop outlet pressure in 0.50~0.80Mpa, to keep
Internal water is liquid, prevents superheated water vaporizes in pipeline and heat exchanger from producing pneumatic hammer, damages equipment.
Claims (6)
1. heat reclamation device is reacted during a kind of toluene liquid phase catalytic oxidation, including reactor (1), reactor (1) bottom
Portion is provided with air supply device (1.1), and air sparger (2), the reactor are connected with the air supply device (1.1)
(1) top is provided with tail gas outlet (1.2), it is characterised in that：The reaction heat reclamation device also includes being arranged on the reaction
Built-in heat exchanger (3) in kettle (1), and be arranged on the steam flash tank (5) of the reactor (1) outside, it is described built-in to change
One end of hot device (3) is connected with the circulating hot water inlet and outlet (5.1) of the steam flash tank (5), the other end and the steam
The overheat water entrance (5.3) of flash tank (5) is connected, and the built-in heat exchanger (3) is imported and exported with the circulating hot water
(5.1) circulating hot water regulation pump (6) is provided between；The built-in heat exchanger (3) with it is described overheat water entrance (5.3) it
Between be provided with overheat water regulating valve (8)；Steam gateway (5.2) is further opened with the steam flash tank (5) and cooling water is mended
Mouth (5.4) is filled, steam control valve (10) is provided with the steam gateway (5.2), is connected on the cooling water supply port (5.4)
It is connected to moisturizing regulation pump (11).
2. react heat reclamation device during toluene liquid phase catalytic oxidation according to claim 1, it is characterised in that：It is described
Demister (9) is connected between steam gateway (5.2) and steam control valve (10).
3. react heat reclamation device during toluene liquid phase catalytic oxidation according to claim 1 or 2, it is characterised in that：
Between the built-in heat exchanger (3) and circulating hot water regulation pump (6), steam trap (7) is provided with.
4. react heat reclamation device during toluene liquid phase catalytic oxidation according to claim 1 or 2, it is characterised in that：
Moisturizing regulating valve (12) is connected between the cooling water supply port (5.4) and moisturizing regulation pump (11).
5. react heat reclamation device during toluene liquid phase catalytic oxidation according to claim 1 or 2, it is characterised in that：
The built-in heat exchanger (3) is finned heat exchanger.
6. react heat reclamation device during toluene liquid phase catalytic oxidation according to claim 1, it is characterised in that：It is described
Overheat water entrance (5.3) and steam gateway (5.2) is opened in the top of steam flash tank (5), the circulating hot water disengaging
Mouth (5.1) and cooling water supply port (5.4) are opened in steam flash tank (5) bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720925556.0U CN207019325U (en) | 2017-07-25 | 2017-07-25 | Heat reclamation device is reacted during toluene liquid phase catalytic oxidation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720925556.0U CN207019325U (en) | 2017-07-25 | 2017-07-25 | Heat reclamation device is reacted during toluene liquid phase catalytic oxidation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207019325U true CN207019325U (en) | 2018-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720925556.0U Active CN207019325U (en) | 2017-07-25 | 2017-07-25 | Heat reclamation device is reacted during toluene liquid phase catalytic oxidation |
Country Status (1)
| Country | Link |
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| CN (1) | CN207019325U (en) |
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2017
- 2017-07-25 CN CN201720925556.0U patent/CN207019325U/en active Active
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