CN104437270B - Acrylic acid reaction system - Google Patents

Acrylic acid reaction system Download PDF

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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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China
Prior art keywords
temperature
oxidation reactor
acrylic acid
molten salt
exerciser
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CN201410649124.2A
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CN104437270A (en
Inventor
梁宏斌
刘利
刘学线
李欣平
王宝杰
杨莉
魏斯钊
张凤涛
王德生
梁策
闻雷
郭晓宇
石文彪
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PetroChina Jilin Chemical Engineering Co.,Ltd.
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Jilin Design Institute
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/02Chemical 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
    • B01J8/06Chemical 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
    • B01J8/067Heating or cooling the reactor
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/21Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
    • C07C51/25Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of unsaturated compounds containing no six-membered aromatic ring
    • C07C51/252Preparation 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008Controlling the process
    • B01J2208/00017Controlling 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

Acrylic acid reaction system
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.
CN201410649124.2A 2014-11-14 2014-11-14 Acrylic acid reaction system Active CN104437270B (en)

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Application Number Priority Date Filing Date Title
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CN104437270B true CN104437270B (en) 2017-06-09

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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

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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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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.