CN104437270B - Acrylic acid reaction system - Google Patents
Acrylic acid reaction system Download PDFInfo
- Publication number
- CN104437270B CN104437270B CN201410649124.2A CN201410649124A CN104437270B CN 104437270 B CN104437270 B CN 104437270B CN 201410649124 A CN201410649124 A CN 201410649124A CN 104437270 B CN104437270 B CN 104437270B
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- Prior art keywords
- temperature
- oxidation reactor
- acrylic acid
- molten salt
- exerciser
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/02—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds
- B01J8/06—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds in tube reactors; the solid particles being arranged in tubes
- B01J8/067—Heating or cooling the reactor
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/25—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of unsaturated compounds containing no six-membered aromatic ring
- C07C51/252—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of unsaturated compounds containing no six-membered aromatic ring of propene, butenes, acrolein or methacrolein
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00008—Controlling the process
- B01J2208/00017—Controlling the temperature
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a kind of acrylic acid reaction system, including oxidation reactor (1) and at least one molten salt circulating pump (3), molten salt circulating pump (3) connects to constitute fused salt circulation loop with oxidation reactor (1) by connecting pipe, temperature transmitter is provided with each connecting pipe, all temperature transmitters are respectively electrically connected with temperature difference exerciser (5) and temperature averages exerciser (6), and temperature difference exerciser (5) and temperature averages exerciser (6) are electrically connected with DCS control systems respectively.It is an object of the invention to provide a kind of acrylic acid reaction system that can be controlled to the radial temperature of propylene acid reaction.
Description
Technical field
The present invention relates to petrochemical industry, more particularly, to a kind of acrylic acid reaction system.
Background technology
Acrylic acid is a kind of important industrial chemicals, is widely used in the production of various chemicals and resin.Acrylic acid can
Aoxidized by propylene two-step and be obtained, the first step is that propylene generates propylene with the oxygen in air in the presence of oxidation catalyst
Aldehyde, second step is that methacrylaldehyde is further oxidized to acrylic acid.
Propylene oxidation reaction is carried out in calandria type fixed bed reactor, and filling oxidation catalyst in pipe, pipe is outer (shell side)
It is hot melt salt.Reaction is needed to run the fused salt circulatory system when starting, and regulation is reached by electric heater preheating catalyst bed
Temperature；Because the course of reaction is the oxidation reaction of heat release, as the carrying out of reaction can produce substantial amounts of reaction heat again, now need
Heat is removed by adjusting the fused salt circulatory system, to control reactor batch temperature.The reaction heat that shell side fused salt is taken away, passes through
Exchanged heat with water in heat exchanger, produce steam.
The key equipment of acrylic acid production is oxidation reactor, and reaction temperature, the especially radially control of temperature is whole
The key of individual course of reaction control, can more embody advance and accuracy that set of device is automatically controlled.
The content of the invention
For problem present in correlation technique, it is an object of the invention to provide it is a kind of can be to the footpath of propylene acid reaction
The acrylic acid reaction system being controlled to temperature.
To achieve the above object, the invention provides a kind of acrylic acid reaction system, including oxidation reactor and at least one
Individual molten salt circulating pump, molten salt circulating pump is connected to constitute fused salt circulation loop, at each with oxidation reactor by connecting pipe
Temperature transmitter is provided with connecting pipe, all temperature transmitters are respectively calculated with temperature difference exerciser and temperature averages
Device is electrically connected, and temperature difference exerciser and temperature averages exerciser are electrically connected with DCS control systems respectively.
According to the present invention, connecting pipe includes the first radial passage and the second radial passage, wherein, molten salt circulating pump enters
Mouth and outlet are connected by the first radial passage and the second radial passage with oxidation reactor respectively, wherein, temperature transmitter sets
Put on the second radial passage.
According to the present invention, acrylic acid reaction system has two molten salt circulating pumps, wherein, the two molten salt circulating pumps are relative
The outside of oxidation reactor is arranged in the form of being mutually symmetrical in oxidation reactor.
According to the present invention, any one molten salt circulating pump in the two molten salt circulating pumps connected with oxidation reactor second
The first temperature transmitter is provided with radial passage, the second radial passage that another molten salt circulating pump is connected with oxidation reactor
On be provided with second temperature transmitter.
According to the present invention, the reaction system also includes electric heater and cooler, wherein, the outlet and cooling of electric heater
The entrance of device is connected with molten salt circulating pump respectively.
According to the present invention, temperature difference exerciser and temperature averages exerciser respectively with the interlock alarm of DCS control systems
Electrical connection.
According to the present invention, interlock alarm is the interlock alarm with acoustic-optic alarm.
Advantageous Effects of the invention are：
In acrylic acid reaction system of the invention, in the connecting pipe that molten salt circulating pump is connected with oxidation reactor
Temperature transmitter is provided with, the system is also drilled with the temperature difference exerciser and temperature averages being connected with DCS control systems in addition
Calculate device.Electrically connected with temperature difference exerciser and temperature averages exerciser respectively by by temperature transmitter, using temperature difference exerciser
Interlock alarm system in the feeding that resulted in DCS；According to different technology and catalyst parameters, set in dcs
Surely desired temperature is controlled, temperature averages exerciser results in be carried out again with the control desired temperature being input into DCS
The temperature difference is calculated, and its temperature difference results in the interlock alarm system in same feeding DCS.Either the temperature difference has exceeded the scope for allowing
Or temperature averages have exceeded the scope for allowing with the temperature difference of the control desired temperature of input in DCS, will carry out acousto-optic
Alarm and stop in emergency.Therefore, reaction system of the invention ensure that being precisely controlled for oxidation reactor radial temperature, it is ensured that
The even running of reaction.
Brief description of the drawings
Fig. 1 is the structural representation of acrylic acid reaction system of the present invention.
Specific embodiment
Referring now to Fig. 1, acrylic acid reaction system of the invention is described.
In acrylic acid reaction system of the invention, it includes oxidation reactor 1, heater 2, the circulation of at least one fused salt
Pump 3 and cooler 4.Wherein, connected by connecting pipe between molten salt circulating pump 3 and oxidation reactor 1, followed with constituting fused salt
Loop back path, the outlet of heater 2 and the entrance of cooler 4 are connected with molten salt circulating pump 3 respectively.
Specifically, for propylene acid reaction, propylene needs certain heat when oxidation reaction starts, so first
Fused salt is heated in heater 2 first, using the fused salt after heating for acrylic acid oxidation reaction provides heat.Fused salt leads to
After crossing the heating of heater 2, feeding molten salt circulating pump 3 makes fused salt circulate in systems simultaneously, and so that in oxidation reactor 1
Beds reach the temperature of regulation.Then, substantial amounts of heat can be produced when oxidation reaction is carried out, these heats are through heat exchange
The fused salt in pipe shell journey is transmitted and heats, heated fused salt again passes by molten salt circulating pump 3 and is admitted to cooler 4.
In cooler 4, fused salt and desalted water are exchanged heat, so as to produce steam to be removed with by heat.
The above is the basic procedure and step of propylene acid reaction, and those skilled in the art can be thought by above-mentioned steps
Temperature, pressure to needed for above steps are appropriately configured.Also, in the premise without departing from the scope of the present invention
Under, those skilled in the art are it is conceivable that other appropriate additional steps and the order to above-mentioned steps are suitably replaced.Cause
This, the above can not to the present invention constitute limit, above-mentioned setting and selection can be according to particular condition in use depending on, the present invention
It is not limited to this.
Further, with continued reference to Fig. 1, in a preferred embodiment, it is connected with oxidation reactor 1 by molten salt circulating pump 3
Connecting pipe on can be provided with temperature transmitter, and all temperature transmitters respectively with temperature exerciser 5 and temperature
Means algorithm device 6 is electrically connected.More specifically, temperature exerciser 5 and temperature averages exerciser 6 are respectively electrically connected to DCS (dividing
Cloth control system) control system.
Specifically, electrically connected with temperature difference exerciser 5 and temperature averages exerciser 6 respectively by by temperature transmitter,
That is, the interlock alarm of temperature difference exerciser 5 and temperature averages exerciser 6 respectively with DCS control systems is electrically connected.Preferred
In embodiment, interlock alarm is the interlock alarm with acoustic-optic alarm, i.e. interlock alarm can be with sound and light alarm
Form send alarm.
Resulted in the interlock alarm system sent into DCS using temperature difference exerciser 5；Additionally, according to different works
Skill technology and catalyst parameters, in dcs setting control desired temperature, temperature averages exerciser 6 result in in DCS
The above-mentioned control desired temperature of input carries out temperature difference calculation again, and its temperature difference results in the interlocking report in same feeding DCS
Alert system.Either the temperature difference has exceeded the scope or temperature averages and the control desired temperature of input in DCS for allowing
The temperature difference has exceeded the scope for allowing, and will carry out sound and light alarm and stop in emergency.Therefore, reaction system of the invention ensure that
The radial temperature of oxidation reactor 1 is precisely controlled, it is ensured that the even running of reaction.The concrete operations of process as described above will with
Under be described in detail.
With continued reference to Fig. 1, in a preferred embodiment, above-mentioned connecting pipe includes the first radial passage I and the second footpath
To pipeline II.Wherein, the entrance and exit of molten salt circulating pump 3 respectively by the first radial passage I and the second radial passage II with
Oxidation reactor 1 is connected, and temperature transmitter is arranged on the second radial passage II.As shown by arrows in FIG., fused salt is in oxygen
Changing and flowed out through the first radial passage I after absorb heat in reactor 1 and deliver to molten salt circulating pump 3, after after cooling down again by the second footpath
In oxidation reactor 1 being returned to passage II.In a preferred embodiment, the first above-mentioned radial passage I and second is radially logical
Road II is the horizontal-extending passage for being parallel to each other and being each perpendicular to the side wall of oxidation reactor 1.Due to acrylic acid course of reaction
In reaction temperature, the especially radially control of temperature is the key of whole course of reaction control, therefore the present invention becomes temperature
Send device to be arranged on the second radial passage II, be that control is monitored to the radial temperature at the second radial passage II, so that
Radial temperature that can be further to oxidation reactor 1 is precisely controlled, to ensure the even running of reaction.
Specifically, as shown in figure 1, in an optional embodiment, acrylic acid reaction system can have two fused salts
Circulating pump 3, and the two molten salt circulating pumps 3 are arranged on oxidation reaction relative to oxidation reactor 1 in the form of being mutually symmetrical
The outside of device 1, i.e. centered on oxidation reactor 1, the two molten salt circulating pumps 3 are arranged in specular each other.Further,
Set in the second radial passage II that any one molten salt circulating pump in the two molten salt circulating pumps 3 is connected with oxidation reactor 1
First temperature transmitter, first temperature transmitter is shown with TI-1A in Fig. 1；And it is another in the two molten salt circulating pumps 3
Second temperature transmitter is provided with the second radial passage II that one molten salt circulating pump is connected with oxidation reactor 1, this second
Temperature transmitter is shown with TI-1B in Fig. 1.
With reference to embodiment illustrated in fig. 1, operating process of the description present system in actual motion.In oxidation reactor 1
Carry out the oxidation reaction initial stage or when oxidation reactor 1 stop charging keeping temperature during, first by with the phase of oxidation reactor 1
Connect to constitute the operation of the molten salt circulating pump 3 of fused salt circulation loop, the temperature to beds in oxidation reactor 1 is carried out
Regulation, to reach temperature needed for oxidation reaction.In this process, fused salt is heated using heater 2 to control fused salt temperature
Degree.For example, in an alternate embodiment of the invention, fused salt can be heated to 335 DEG C by heater 2, and maintain the reaction temperature.
, it is necessary to adjust salt melting system with by instead during propylene and oxygen are chemically reacted and are produced a large amount of heat of reaction
Heat is answered to remove so as to keep the temperature in oxidation reactor 1.Now, will be reacted in oxidation reactor 1 by molten salt circulating pump 3
Liberated heat is removed via molten heat transfer salt, and is sent into cooler 4 and exchanged heat with desalted water, so as to produce 1.8MpaG's
Saturated vapor simultaneously reclaims heat energy.
In the embodiment shown for thermocouple, enter two temperature transmitters of trip temperature for measuring reactor fused salt
TI-1A and TI-1B are separately mounted on the radial direction fused salt pipeline of the both sides of oxidation reactor 1, i.e. two second radial passage II
On.Temperature difference instruction is carried out using this two thermocouples, i.e. realize by temperature exerciser 5, concurrently set when this two thermocouples
The temperature difference is alarmed when reaching ± 2 DEG C, is interlocked when the temperature difference reaches ± 3 DEG C.
Additionally, this two thermocouples indicate also to carry out average value instruction except carrying out the temperature difference, i.e. drilled by temperature averages
Device 6 is calculated to realize.Specifically, user can set control temperature according to different process technology and catalyst parameters in DCS system
Setting value, the above-mentioned control desired temperature for indicating input in result and DCS system by the average value for monitoring carries out temperature again
Difference is calculated, and the temperature difference of setting average value and control desired temperature reaches ± 2 DEG C of alarms, and the temperature difference is interlocked when reaching ± 3 DEG C.
Thus, the temperature difference indicates (that is, the first time temperature difference instruction realized by temperature exerciser 5 to the present invention twice more than
Indicated with second temperature difference realized by temperature averages exerciser 6) and interlocking measure (that is, the connection of DCS system of alarming accordingly
Lock warning device), so as to ensure that the accurate temperature control of oxidation reactor radial temperature, and ensure that the steady of reactor
Operation.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (6)
1. a kind of acrylic acid reaction system, including oxidation reactor (1) and at least one molten salt circulating pump (3), the fused salt are followed
Ring pump (3) connects to constitute fused salt circulation loop with the oxidation reactor (1) by connecting pipe, it is characterised in that
Temperature transmitter is provided with each described connecting pipe, all temperature transmitters are respectively calculated with the temperature difference
Device (5) and temperature averages exerciser (6) are electrically connected, and the temperature difference exerciser (5) and the temperature averages exerciser (6) divide
Do not electrically connected with DCS control systems；
Wherein, the temperature difference exerciser (5) and the temperature averages exerciser (6) respectively with the connection of the DCS control systems
Lock alarm electrical connection；
The connecting pipe includes the first radial passage (I) and the second radial passage (II), first radial passage (I) and institute
It is to be parallel to each other and be each perpendicular to the horizontal-extending of the oxidation reactor (1) side wall to lead to state the second radial passage (II)
Road.
2. acrylic acid reaction system according to claim 1, it is characterised in that
The entrance and exit of the molten salt circulating pump (3) is respectively by first radial passage (I) and second radial tubes
Road (II) is connected with the oxidation reactor (1),
Wherein, the temperature transmitter is arranged on second radial passage (II).
3. acrylic acid reaction system according to claim 1, it is characterised in that
The acrylic acid reaction system has two molten salt circulating pumps (3),
Wherein, two described molten salt circulating pumps (3) are arranged on relative to the oxidation reactor (1) in the form of being mutually symmetrical
The outside of the oxidation reactor (1).
4. acrylic acid reaction system according to claim 3, it is characterised in that
Any one molten salt circulating pump in two described molten salt circulating pumps (3) connected with the oxidation reactor (1) second
The first temperature transmitter is provided with radial passage (II), another molten salt circulating pump is connected with the oxidation reactor (1)
Second temperature transmitter is provided with second radial passage (II).
5. the acrylic acid reaction system according to any one of claim 1-4, it is characterised in that also including electric heater
(2) and cooler (4),
Wherein, the entrance of the outlet of the electric heater (2) and the cooler (4) connects with the molten salt circulating pump (3) respectively
It is logical.
6. acrylic acid reaction system according to claim 1, it is characterised in that
The interlock alarm is the interlock alarm with acoustic-optic alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410649124.2A CN104437270B (en) | 2014-11-14 | 2014-11-14 | Acrylic acid reaction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410649124.2A CN104437270B (en) | 2014-11-14 | 2014-11-14 | Acrylic acid reaction system |
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| Publication Number | Publication Date |
|---|---|
| CN104437270A CN104437270A (en) | 2015-03-25 |
| CN104437270B true CN104437270B (en) | 2017-06-09 |
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| CN201410649124.2A Active CN104437270B (en) | 2014-11-14 | 2014-11-14 | Acrylic acid reaction system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110142007B (en) * | 2019-05-21 | 2020-05-05 | 宁波浙铁江宁化工有限公司 | Molten salt circulation structure in maleic anhydride preparation reactor |
| CN110801784A (en) * | 2019-11-14 | 2020-02-18 | 西安航天华威化工生物工程有限公司 | Acrolein reaction system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4742520B2 (en) * | 2004-05-27 | 2011-08-10 | 三菱化学株式会社 | Reactor, reactor control system, and catalytic gas phase oxidation reaction method |
| CN100565400C (en) * | 2007-10-29 | 2009-12-02 | 中国石油集团工程设计有限责任公司东北分公司 | Propylene oxidation unit DCS control system in the acroleic acid device |
| CN201156197Y (en) * | 2007-10-29 | 2008-11-26 | 中国石油集团工程设计有限责任公司东北分公司 | Propylene oxidation unit automatic control system in acroleic acid production |
| CN203209035U (en) * | 2013-03-26 | 2013-09-25 | 中国石油集团东北炼化工程有限公司吉林设计院 | Automatic control system for removing heat of molten salt in reactor capable of producing acrylic acid through propane one-step process |
| CN203217389U (en) * | 2013-04-07 | 2013-09-25 | 中国石油集团东北炼化工程有限公司吉林设计院 | Control system of reactor for preparing acrylic acid with propane through one-step method |
| CN203540518U (en) * | 2013-10-30 | 2014-04-16 | 天津市化工设计院 | Device for removing reaction heat generated in acrolein oxidation |
| CN204294210U (en) * | 2014-11-14 | 2015-04-29 | 中国石油集团东北炼化工程有限公司吉林设计院 | Vinylformic acid reactive system |
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| CN104437270A (en) | 2015-03-25 |
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Effective date of registration: 20200927 Address after: 132002 3-6 and 9-13 floors of Block A, Jihua Economic and Trade Center, Tongtan Road, Changyi District, Jilin Province Patentee after: PetroChina Jilin Chemical Engineering Co.,Ltd. Address before: 132002, Jilin, Jilin Province tung Chi Road East Economic and Trade Building Patentee before: JILIN DESIGNING INSTITUTE OF CNPC NORTHEAST REFINING & CHEMICAL ENGINEERING Co.,Ltd. |