CN104888489A - Acrylonitrile product tower liquid level control method - Google Patents
Acrylonitrile product tower liquid level control method Download PDFInfo
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- CN104888489A CN104888489A CN201410080189.XA CN201410080189A CN104888489A CN 104888489 A CN104888489 A CN 104888489A CN 201410080189 A CN201410080189 A CN 201410080189A CN 104888489 A CN104888489 A CN 104888489A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
- B01D3/4211—Regulation; Control of columns
- B01D3/4238—Head-, side- and bottom stream
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
- B01D3/4211—Regulation; Control of columns
- B01D3/4261—Side stream
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C253/00—Preparation of carboxylic acid nitriles
- C07C253/32—Separation; Purification; Stabilisation; Use of additives
- C07C253/34—Separation; Purification
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- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
An acrylonitrile product tower liquid level control method comprises the following steps: supplying feed stream to a product tower, wherein the product tower comprises an upper portion, a middle portion and a bottom portion, and the middle portion comprises a series of distillation tower plates; distilling the feed stream in the product tower to obtain a liquid/steam product with higher purity than the feed stream; removing the liquid/steam product from the product tower through a branch streamline, wherein a lateral streamline comprises a control valve; and detecting the tower bottom product liquid level of a liquid in the product tower to control the tower bottom product liquid level of the liquid in the product tower, and using a tower bottom product liquid level controller to control the control valve of the branch streamline or reset a branch flow controller, wherein the branch flow controller is provided with a control valve for controlling the branch streamline.
Description
Technical field
The present invention relates to a kind of improving one's methods for the manufacture of acrylonitrile and methacrylonitrile.Specifically, the present invention is directed to and comprise improving one's methods of product tower Liquid level.
Background technology
Become known for the various method and systems manufacturing acrylonitrile and methacrylonitrile; See such as, U.S. Patent No. 6,107,509.As U.S. Patent No. 6,107, pointed by 509, conventional method generally includes recovery to the acrylonitrile/methacrylonitrile produced in the direct reaction existed under catalyst by the hydrocarbon being selected from the group that propane, propylene or isobutene, ammonia and oxygen form and purification, described recovery and purification are realized by the following: the reactor effluent comprising acrylonitrile/methacrylonitrile is transported to the first tower (quenching), at the first tower place, carry out cooling reactor effluent with the first aqueous fluid stream; Be transported to by the effluent of the cooling comprising acrylonitrile/methacrylonitrile in the second tower (absorber), at the second tower place, the effluent of cooling and the second moisture fluid-flow contact are to absorb in the second aqueous fluid stream by acrylonitrile/methacrylonitrile; The the second aqueous fluid stream comprising acrylonitrile/methacrylonitrile is transported to the first destilling tower (recovery tower) from the second tower, for by crude acetonitrile/methacrylonitrile from the second aqueous fluid flow point from; And be separated crude acetonitrile/methacrylonitrile is transported to after-fractionating tower (head heats up in a steamer tower), so that some impurity of major general remove from crude acetonitrile/methacrylonitrile; And the acrylonitrile/methacrylonitrile of Partial purification is transported to the 3rd destilling tower (product tower), to obtain product acrylonitrile/methacrylonitrile.U.S. Patent No. 4,234,510; No.3,885,928; No.3,352,764; No.3,198,750 and No.3,044,966 illustrate that the typical case being used for acrylonitrile and methacrylonitrile reclaims and method of purification.
Acrylonitrile product tower is usually with lower than the flow velocity of other liquid stream that considerable tower bottom product flow velocity operates.Tower bottom product flow velocity is recycled to a certain degree usually in acrylonitrile installation, under this degree, high-boiling-point impurity can be removed from device.There is the technological challenge keeping tower bottom product flow velocity relative constancy in conventional method.Fail to keep tower bottom product flow velocity relative constancy that acrylonitrile product may be caused to exceed desired characteristic or predetermined dimension, interference is caused to the other side of acrylonitrile recovery and purification system.Except thirsting for the flow velocity of maintenance relative constancy, the flow velocity of this tower bottom product flowing stream is too little, so that is difficult to use in the liquid level effectively controlled in product tower hopper (sump).
Technology described herein allows product tower tower bottom product flow velocity to keep relative constancy, still provides the effective control to product tower hopper liquid level simultaneously.
Summary of the invention
Therefore, an aspect of the present disclosure is to provide a kind of safe, effective and cost-saving method and apparatus, and described method and apparatus allows product tower tower bottom product flow velocity to keep relative constancy, still provides the effective control to product tower hopper liquid level simultaneously.
On the one hand, provide a kind of method comprised the following steps: feed stream is supplied to product tower, described product tower comprises top, middle part and bottom.Middle part comprises a series of distillation tray.Described method comprises: the feed stream in product of distillation tower, to obtain the liquid/vapor product purer than feed stream.Described method comprises: removed from product tower by liquid/vapor product by a streamline, described streamline comprises control valve.On the one hand, described method comprises: by detecting the tower bottom product liquid level of liquid in product tower or steam, and use tower bottom product fluid level controller to control the control valve of a streamline or reset tributary flow controller, control the tower bottom product liquid level of the liquid in product tower, described tributary flow controller is arranged to the control valve controlling a streamline.
Accompanying drawing explanation
Can come by reference to the following description in consideration of the drawings, obtain the more complete understanding to exemplary of the present invention and advantage thereof, in the accompanying drawings, equal reference numbers instruction same characteristic features, and in the accompanying drawings:
Fig. 1 is the indicative flowchart of the embodiment according at least one aspect of the present disclosure.
Fig. 2 is the indicative flowchart of the embodiment according at least one aspect of the present disclosure.
Fig. 3 is the indicative flowchart of the embodiment according at least one aspect of the present disclosure.
Fig. 4 illustrates the flow chart of the method according to many aspects of the present disclosure.
Fig. 5 illustrates the flow chart of the method according to many aspects of the present disclosure.
Fig. 6 illustrates the flow chart of the method according to many aspects of the present disclosure.
Detailed description of the invention
On the one hand, provide a kind of method comprised the following steps: feed stream is supplied to product tower, described product tower comprises top, middle part and bottom.Middle part comprises a series of distillation tray.Described method comprises: the feed stream in product of distillation tower, to obtain the liquid/vapor product purer than feed stream.Described method comprises: liquid or vapor product are removed from product tower by a streamline, described streamline comprises control valve.Described method comprises: by detecting the tower bottom product liquid level of the liquid in product tower, and use tower bottom product fluid level controller to control the control valve of a streamline or reset tributary flow controller, control the tower bottom product liquid level of the liquid in product tower, described tributary flow controller is arranged to the control valve controlling a streamline.
On the one hand, provide a kind of equipment comprising product tower, described product tower comprises top, middle part and bottom.Described equipment can comprise a series of distillation trays in the middle part being positioned at product tower, and each distillation tray is positioned at certain altitude place in product tower, thus other distillation tray in each distillation tray and distillation tray is positioned at differing heights place.Described equipment comprises the tower bottom product fluid level controller of the tower bottom product liquid level be arranged in the bottom detecting product tower.Described equipment comprises product tower and props up streamline, and a streamline leaves from the middle part of product tower and is communicated with the product exit fluid of product tower, and described product tower props up streamline and comprises control valve.Tower bottom product fluid level controller is arranged to and controls control valve or the replacement tributary flow controller that product tower props up streamline, described tributary flow controller is arranged to and controls the control valve that product tower props up streamline, and the control valve that wherein the tower bottom product liquid level of product tower is propped up on streamline by adjustment product tower controls.
Many aspects of the present disclosure are discussed further referring to accompanying drawing.
Equipment 100 shown in Fig. 1.As shown in fig. 1, by raw material streamline 1, feed stream 101 is supplied to product tower 10.Feed stream 101 can comprise the acrylonitrile/methacrylonitrile liquid of Partial purification.Acrylonitrile/methacrylonitrile the liquid of the Partial purification in feed stream 101 can from any applicable source, and as destilling tower or head heat up in a steamer tower (not shown), such as, in the field producing acrylonitrile/methacrylonitrile, known destilling tower or head heat up in a steamer tower.Raw material streamline 1 is communicated with import 29 fluid of product tower 10.On the one hand, feed stream 101 is the acrylonitrile of about 95% percentage by weight or more and 5% percentage by weight or less water; On the other hand, be the acrylonitrile of 99% percentage by weight or more and about 1% percentage by weight or less water; On the other hand, be the acrylonitrile of about 99.5% percentage by weight or more and about 0.5% percentage by weight or less water; And on the other hand, be the acrylonitrile of about 99.9% percentage by weight or more and about 0.1% percentage by weight or less water.
Product tower 10 comprises bottom or bottom 28, middle part 31 and top 30.Middle part 31 comprises multiple column plate 11, and is positioned between bottom 28 and top 30.Multiple column plate can be the column plate of any applicable quantity for obtaining the product tributary 103 desired by the acrylonitrile comprising scheduled volume by weight in tributary 103.Such as, but not as restriction, the quantity of the column plate 11 in middle part 31 can between about 45 (45) to 55 (55) individual column plates, and in preferred embodiments, between about 47 (47) to 53 (53) individual column plates, and in an even more preferred embodiment, between about 49 (49) to 51 (51) individual column plates.Product tower 10 is left by the product exit 33 be communicated with streamline 3 fluid in tributary 103.
Tributary 103 can be sent to storage container (not shown).If tributary 103 is steams, so before transmission stores, described tributary is first made to condense to form liquid in a flow condenser.The flow velocity in tributary 103 can be any applicable flow velocity.Namely the flow velocity that the flow velocity in tributary 103 can equal feed stream 101 deducts product tower bottoms product steam 102(, flows through tower bottom outlet 35 and the stream of tower bottom product streamline 102 by being communicated with outlet 35 fluid) and the mobile flow velocity by the stream 105 of streamline 5.In embodiments, the flow velocity in tributary 103 can be about 80% to 97% of the flow velocity of feed stream 101; On the other hand, about 85% to about 97%; On the other hand, about 90% to about 97%; And on the other hand, about 93% to about 97%.Product tower 10 comprises the top exit 37 at the top place being positioned at top 30.Stream 106 is left by top exit 37, and flows through the streamline 6 be communicated with top exit 37 fluid.Stream 106 can be condensed by the cold water in heat exchanger 7 and cool.After cooled in heat exchanger 7, stream 106 can be sent to container 8.Can by pump 9 from container 8 MPTS 106.Stream 105 can be leaving from the junction surface 39 of streamline 4 of stream 106 and and unlike stream 104, be passed to the part of product tower 10 by streamline 4 again.Flow controller 30 can be arranged to and activate and control valve 32.Valve 32 can be arranged to: the size being flowed through the aperture of valve 32 by alter, regulates the flow velocity of the stream 105 of flowing in streamline 5.Container 8 can comprise fluid level controller 34.Fluid level controller 34 can be arranged to and activate and control valve 36.Valve 36 can be arranged to: the size being flowed through the aperture of valve 36 by alter, regulates the flow velocity of the stream 104 of flowing in streamline 4.On the one hand, product composition is the acrylonitrile of about 98% percentage by weight or more and 2% percentage by weight or less water; On the other hand, the acrylonitrile of 99% percentage by weight or more and about 1% percentage by weight or less water; On the other hand, the acrylonitrile of about 99.5% percentage by weight or more and about 0.5% percentage by weight or less water; With on the other hand, the acrylonitrile of about 99.9% percentage by weight or more and about 0.1% percentage by weight or less water.
The flow velocity that product tower bottoms product steam 102 flows through streamline 2 can be controlled by flow controller 20, such as, keeps constant or relative constancy.Flow controller 20 can be arranged to and activate and control valve 21.Valve 21 can be arranged to: the size flowing through the aperture of valve 21 by controlling fluid, controls the flow velocity of the stream 102 of flowing in streamline 2.Pump 27 may be used for bottoms product steam 102 to pump from product tower 10.In embodiments, flow controller 20 can be arranged to and be activated and control pump 27 by communicating passage (not shown in Figure 1), and pump 27 can be arranged to the flow velocity regulating the liquid transmitted by pump 27.
Product tower 10 can comprise tower bottom product fluid level controller 22.Tower bottom product fluid level controller 22 can be positioned under the column plate 25 in multiple column plate 11.Column plate 25 can be that the bottom 28(of product tower 10 is also called as product tower hopper liquid level) top the first (1st) column plate.Tower bottom product fluid level controller 22 can be arranged to and activates and control control valve 24.Control valve 24 can be arranged to: the size flowing through the aperture of valve 24 by controlling fluid, controls the flow velocity of the stream 103 flowing through a streamline 3, and therefore reaches effective Liquid level of the liquid 26 at bottom 28 place to product tower 10.
Therefore, when tower bottom product fluid level controller 22 detects the scope of the liquid level of the liquid 26 at 28 places, bottom higher than predetermined fluid level or liquid level, tower bottom product fluid level controller 22 actuation control valve 24 is to open suitable amount more from its initial opening, and allow more liquid along with flowing out product tower 10 by outlet 33 and a streamline 103 in tributary 103, instead of flow down the hopper arriving 28 places, bottom along column plate.When tower bottom product fluid level controller 22 detects the scope of the liquid level of the liquid 26 at 28 places, bottom lower than predetermined fluid level or liquid level, tower bottom product fluid level controller 22 actuation control valve is to cut out suitable amount more from its initial opening, and allow less liquid along with flowing out product tower 10 by outlet 33 and a streamline 103 in tributary 103, thus allow more liquid to flow down the hopper arriving 28 places, bottom along column plate.In embodiments, the predetermined fluid level of the liquid 26 at bottom 28 place or scope about six (6) to eight (8) foot of liquid level high.
Feed stream 101 can enter product tower 10 in pre-position.On the one hand, feed stream 101 can column plate 13 by import 29 and in multiple column plate 11 and enter product tower 10 between column plate 15.Column plate 13 can be product tower 10 bottom 28 above the 8th (8th) column plate to the ten five (15th) column plate.
Tributary 103 can column plate 17 by outlet 33 and in multiple column plate 11 and leaving from product tower between column plate 19.Column plate 17 can be product tower 10 bottom 28 above the 33 (33rd) column plate to the 37 (37th) column plate.
Stream 104 can enter product tower 10 above the column plate 23 by import 38 and in multiple column plate 11.Column plate 23 can be product tower 10 bottom 28 above multiple column plates in most high tray.
The flow velocity of feed stream 10 can be any applicable flow velocity depending on device capability.As previously pointed out, the flow velocity that the flow velocity in tributary 103 can equal feed stream 101 deducts the flow velocity of product tower bottoms product steam 102 and stream 105.Stream 105 can be product top of tower stream 106 and unlike stream 104, be passed to the part of product tower 10 again.In embodiments, the flow velocity in tributary 103 can be about 80% to 97% of the flow velocity of feed stream 101.The flow velocity of product tower bottoms product steam 102 can be about 1% of the flow velocity of feed stream 101 to about 10%; On the other hand, be about 1% to about 5%; On the other hand, be about 1% to about 3%; And on the other hand, be about 1.66% to about 2%.The flow velocity of stream 105 can be about 2% of the flow velocity of feed stream 101 to about 5%.The flow velocity of stream 104 can be about 133% of the flow velocity of feed stream 101 to about 166%.On the other hand, backflow (stream 104) is about 1.5 to about 3 with the ratio in tributary (flowing 103); On the other hand, be about 1.75 to about 2.75; On the other hand, be about 1.5 to about 2.25; And on the other hand, be about 2.
Fig. 2 illustrates according to another embodiment of the present disclosure.Equipment 200 shown in Fig. 2.Except equipment 200 comprises except flow controller 202 further on product tower tributary 103, equipment 200 is identical with the equipment 100 shown in Fig. 1.In this embodiment, major loop or primary circuit comprise fluid level controller 22, and the liquid level of the liquid 26 at 28 places, bottom is measured or detected to described fluid level controller; Detected liquid level and predetermined set liquid level are compared; And what change tributary flow controller 202 arranges flow velocity.In this embodiment, subordinate loop or secondary loop comprise tributary flow controller 202, and described tributary flow controller is measured or detected the flow velocity flowing through the tributary 103 of streamline 3; By described flow velocity and tributary flow controller 202(, it is controlled by the major loop discussed above or primary circuit) the flow velocity that arranges compare; And actuated flow control valve 24, thus the aperture of adjust flux control valve 24 arranges flow velocity with what correspondingly mate tributary flow controller 202.In other words, product tower tower bottom product fluid level controller 22 is arranged to and resets tributary flow controller 202.Tributary flow controller 202 is arranged to the flow control valve 24 activated on a streamline 3.
The advantage that this tandem type controls is: contribute to the liquid level of the liquid 26 at bottom 28 place of product tower 10 to maintain predetermined value or scope.The position of the aperture of flow control valve 24 does not directly affect the liquid level of the liquid 26 at 28 places, bottom.On the contrary, the flow velocity in the tributary 103 in streamline 3 is the Direct Variables required for liquid level of the liquid 26 maintaining 28 places, bottom.Because tributary 103 has flow velocity may tend to higher frequency change, so use subordinate loop or secondary loop.The flow velocity in tributary 103 may fluctuate, and if fluctuate, the flow velocity measured by flow controller 202 may change faster than the liquid level measured by fluid level controller 22.
According to this embodiment, flow controller 202 is arranged to and the undulated control on the flow velocity in tributary 103 is arranged speed to flow controller 202, and fluid level controller 22 is arranged to: by increase or reduce flow controller 202 speed is set, control the fluctuation of the liquid level of the liquid 26 at 28 places, bottom.Tandem type Type Control in this embodiment uses two inputs to carry out control valve 24, and allow equipment 200 to regulate and leave the convertible fluids flow velocity of product tower 10 by streamline 3 and/or by the tributary 103 of streamline 3, both rate of flow of fluids are set, to reach the predetermined fluid level of the liquid 26 in the bottom 28 of product tower 10.One skilled in the art will appreciate that, according to the disclosure, this tandem type Type Control contributes to the fluctuation reducing product tower tributary 103 flow velocity, and cause the fluctuation in the liquid level of the liquid 26 in bottom 28, thus the liquid level of the liquid 26 in bottom 28 is maintained desired predetermined fluid level or maintains within the preset range of desired liquid level.
Fig. 3 illustrates according to another embodiment of the present disclosure.Equipment 300 shown in Fig. 3.Except equipment 300 comprises the flow indicator 304 be communicated with flow controller 302 fluid further, equipment 300 is identical with the equipment 200 shown in Fig. 2.Flow controller 302 is similar to previously with reference to the flow controller 202 that Fig. 2 discusses.As shown in Figure 3, flow indicator 304 is positioned on raw material streamline 1.Flow indicator 304 is arranged to and detects by raw material streamline 1 and enter the flow velocity of the feed stream 101 in product tower 10.In this embodiment, flow indicator 304 is arranged to supplies following information to flow controller 302, and described information is about entering the flow velocity of the feed stream 101 in product tower 10 by raw material streamline 1.Flow controller 302 is arranged to the information of process from flow indicator 304, and anticipating the product tower tower bottom product liquid level of liquid 26 (namely, the liquid level of the liquid 26 in the bottom 28 of product tower 10) change (described change when do not regulate by the product tower tributary 103 of streamline 3 flow velocity is set will probably occur) when, what regulate product tower tributary 103 arranges flow velocity.This feed-forward control system contributes to reducing the liquid level of liquid 26 in the bottom 28 of product tower 10 and the fluctuation on both flow velocitys in product tower tributary 103, described fluctuation otherwise will occur due to the fluctuation on the flow velocity of feed stream 101.
Those of skill in the art recognize that according to the disclosure, measure or detect disturbance on feed stream 101 or fluctuation by flow indicator 304, and be passed to flow controller 302 about the information of fluctuation.Flow controller 302 is arranged to the information that receives from flow indicator 304 and the fluctuation on the flow velocity of feed stream 101 that is measured or that detect is described.
On the one hand, controller 68 can be arranged to one or more signals that process corresponds to measured parameter (liquid level such as, measured by fluid level controller 22).Controller 68 can be arranged to determines that measured parameter is more than predefined parameter scope or below, and such as, the liquid level measured by fluid level controller 22 is below predetermined fluid level scope or more.Controller 68 can be arranged to: if measured parameter is below predefined parameter scope or more, then regulate the operation of one or more device via communication line or radio communication (not shown in Fig. 1, Fig. 2 and Fig. 3).Such as, controller 68 can be arranged to: when the liquid level measured by fluid level controller 22 is below predetermined fluid level scope or more, regulate the amount flowing through the tributary 103 of valve 24.Controller 68 can be arranged to the operation of control valve 24, as the size of the aperture of control valve 24.Those of skill in the art recognize that controller 68 or similar control device can be located away from fluid level controller 22 (as shown in Figure 1, Figure 2 and shown in Fig. 3), maybe can be positioned in fluid level controller 22 place and comprise described fluid level controller.Controller 68 can be arranged to: control the operation of product tower tower bottom product fluid level controller 22 and the replacement as described above to tributary flow controller 202 and 302.Controller 68 can be arranged to: control tributary flow controller 202 and 302 and activate the flow control valve 24 propped up on streamline 3.Controller 68 can be arranged to the operation of control flow check amount controller 302.
Fig. 4 illustrates the flow chart of the method 400 according to many aspects of the present disclosure.Method 400 can use previously described equipment (equipment such as, shown in Fig. 1) to realize.Step 401 comprises: feed stream is supplied to product tower, and described product tower comprises top, middle part and bottom, and wherein said middle part comprises a series of distillation tray.Step 402 comprises: distill the feed stream in described product tower, to obtain the liquid/vapor product purer than described feed stream.Step 403 comprises: removed from described product tower by liquid/vapor product by a streamline, described streamline comprises control valve.Step 404 comprises: detect the tower bottom product liquid level in the bottom of described product tower.Step 405 comprises: by regulating described control valve, controls the tower bottom product liquid level in the bottom of described product tower.
Fig. 5 illustrates the flow chart of the method 500 according to many aspects of the present disclosure.Method 500 can use previously described equipment (equipment such as, shown in Fig. 2) to realize.Step 501 comprises: feed stream is supplied to product tower, and described product tower comprises top, middle part and bottom, and wherein said middle part comprises a series of distillation tray.Step 502 comprises: distill the feed stream in described product tower, to obtain the liquid/vapor product purer than described feed stream.Step 503 comprises: removed from described product tower by liquid/vapor product by a streamline, described streamline comprises control valve, and wherein said control valve is controlled by a stream controller.Step 504 comprises: detect the tower bottom product liquid level in the bottom of described product tower.Step 505 comprises: detected tower bottom product liquid level and predetermined set liquid level are compared.Step 506 comprises: when detected tower bottom product liquid level is outside preset range, is reset to and new arranges flow velocity by the flow velocity that arranges of described stream controller.Step 507 comprises: regulate described control valve according to the described flow velocity that arranges newly.
Fig. 6 illustrates the flow chart of the method 600 according to many aspects of the present disclosure.Method 600 can use previously described equipment (equipment such as, shown in Fig. 3) to realize.Step 601 comprises: feed stream is supplied to product tower, and described product tower comprises top, middle part and bottom, and wherein said middle part comprises a series of distillation tray.Step 602 comprises: distill the feed stream in described product tower, to obtain the liquid/vapor product purer than described feed stream.Step 603 comprises: removed from described product tower by described liquid/vapor product by a streamline, described streamline comprises control valve, and wherein said control valve is controlled by a stream controller.Step 604 comprises: the flow velocity detecting the described feed stream arriving described product tower.Step 605 comprises: the flow velocity of detected described feed stream and predetermined feed speed are compared.Step 606 comprises: when the flow velocity of the described feed stream of detected arrival described product tower is outside predetermined feed speed scope, is reset to and new arranges flow velocity by the flow velocity that arranges of described stream controller.Step 607 comprises: the new flow velocity that arranges according to described stream controller regulates described control valve.
Although be described the disclosure with reference to some preferred embodiment of the present disclosure in above description, and state many details for purpose of explanation, but it will be appreciated by those skilled in the art that, the disclosure has been easy to other embodiments, and when not departing from basic principle of the present disclosure, some details described herein can be changed significantly.Should be appreciated that, when not departing from the scope of spirit and scope of the present disclosure or claims, feature of the present disclosure is easy to be modified, change, change or substitute.Such as, the size of various parts, quantity, model and shape can be changed to coordinate embody rule.Therefore, shown and described herein specific embodiments is only for illustration of property object.
Claims (26)
1. an equipment, it comprises:
Product tower, product tower comprises top, middle part and bottom;
A series of distillation tray, it is positioned in the middle part of product tower, and each distillation tray is positioned at At The Heights different from other distillation tray in distillation tray in product tower;
Tower bottom product fluid level controller, it is arranged to the tower bottom product liquid level in the bottom detecting product tower;
Product tower props up streamline, and it leaves from the middle part of product tower and is communicated with the product exit fluid of product tower, and product tower props up streamline and comprises control valve;
Tower bottom product fluid level controller, it is arranged to and controls the control valve that product tower props up streamline, the tower bottom product liquid level wherein by regulating the product tower control valve propped up on streamline to control product tower.
2. equipment as claimed in claim 1, wherein said product tower is arranged to: the acrylonitrile liquid charging stock being carried out receiving unit purification by the material inlet in the middle part of product tower, and be arranged to further purification acrylonitrile liquid, wherein product tower props up streamline and is arranged to: receive in product tower by the acrylonitrile liquid of purifying further.
3. equipment as claimed in claim 2, wherein said material inlet is positioned at above the first distillation tray, and product exit is positioned at above after-fractionating column plate, and wherein the first distillation tray is below after-fractionating column plate.
4. equipment as claimed in claim 3, the quantity of the distillation tray in wherein said product tower is in 45 scopes to 55 column plates.
5. equipment as claimed in claim 4, wherein said first distillation tray be above the bottom of product tower the 8th in the scope of the 15 distillation tray.
6. equipment as claimed in claim 4, wherein said after-fractionating column plate is in the scope of the 33 to the 37 column plate above the bottom of product tower.
7. equipment as claimed in claim 2, wherein said product tower is arranged to the acrylonitrile liquid charging stock being carried out receiving unit purification by raw material mouth.
8. equipment as claimed in claim 2, wherein said bottom comprises tower bottom outlet, and wherein said equipment comprises tower bottom product streamline further, and tower bottom product streamline leaves from the bottom of described product tower and is communicated with tower bottom outlet fluid.
9. equipment as claimed in claim 8, wherein said product tower comprises the top exit at the top place being positioned at top, wherein said equipment comprises the streamline that circulates again be communicated with top exit fluid further, the streamline that wherein circulates again comprises the heat exchanger being arranged to and cooling and leave open-topped fluid, then the streamline that circulates is arranged to: the fluid be cooled in a heat exchanger is circulated again and gets back to product tower.
10. equipment as claimed in claim 9, the wherein said streamline that circulates again is arranged to: make the fluid that is cooled in a heat exchanger by the import and turn back to product tower of circulating again in product tower, then import of circulating is positioned at below the top exit of product tower.
11. 1 kinds of equipment, it comprises:
Product tower, product tower comprises top, middle part and bottom;
A series of distillation tray, it is positioned in the middle part of product tower, and each distillation tray is positioned at At The Heights different from other distillation tray in distillation tray in product tower;
Tower bottom product fluid level controller, it is arranged to the tower bottom product liquid level in the bottom detecting product tower;
Product tower props up streamline, and it leaves from the middle part of product tower and is communicated with the product exit fluid of product tower, and product tower props up streamline and comprises control valve;
Tower bottom product fluid level controller, it is arranged to: if the tower bottom product liquid level in the bottom of the product tower detected is outside preset range, then reset tributary flow controller, tributary flow controller is arranged to and controls the control valve that product props up streamline, tower bottom product liquid level wherein by regulating the product tower control valve propped up on streamline to control product tower, thus provide tandem type to control.
12. equipment as claimed in claim 12, it comprises the raw material streamline be communicated with material inlet fluid further, raw material streamline comprises flow indicator, flow indicator is arranged to the flow velocity detecting the raw material being arrived product tower by raw material streamline, and the information of the flow velocity corresponding to detected raw material is provided to flow controller, reset tributary flow controller when being outside preset range with the flow velocity at detected raw material, thus feed-forward control is provided.
13. 1 kinds of equipment, it comprises:
Product tower, product tower comprises top, middle part and bottom, wherein product tower is arranged to: the acrylonitrile liquid charging stock being carried out receiving unit purification by the material inlet in the middle part of product tower, and be arranged to further purification acrylonitrile liquid, wherein product tower props up streamline and is arranged to: receive in product tower by the acrylonitrile liquid of purifying further;
A series of distillation tray, it is positioned in the middle part of product tower, and each distillation tray is positioned at At The Heights different from other distillation tray in distillation tray in product tower;
Product tower props up streamline, and it leaves from the middle part of product tower and is communicated with the product exit fluid of product tower, and product tower props up streamline and comprises control valve and tributary flow controller, and tributary flow controller is arranged to the operation controlling control valve; And
Raw material streamline, it is communicated with material inlet fluid, raw material streamline comprises flow indicator, flow indicator is arranged to the flow velocity detecting the raw material being arrived product tower by raw material streamline, and the information of the flow velocity corresponding to detected raw material is provided to tributary flow controller, reset tributary flow controller when being outside preset range with the flow velocity at detected raw material, thus feed-forward control is provided.
14. 1 kinds of methods, it comprises:
Feed stream is supplied to product tower, product tower comprises top, middle part and bottom, and wherein middle part comprises a series of distillation tray;
Feed stream in product of distillation tower, to obtain the liquid/vapor product purer than feed stream;
Removed from product tower by liquid/vapor product by a streamline, a streamline comprises control valve;
Detect the tower bottom product liquid level in the bottom of product tower; And the tower bottom product liquid level controlled by adjusting control valve in the bottom of product tower.
15. methods as claimed in claim 14, wherein feed stream comprises the acrylonitrile liquid charging stock of Partial purification, and is the acrylonitrile liquid of purifying further than the acrylonitrile liquid charging stock of Partial purification from the liquid/vapor product that product tower removes.
16. methods as claimed in claim 14, wherein said feed stream comprises the acrylonitrile of about 95% percentage by weight.
17. methods as claimed in claim 15, wherein base feed stream is the import by being positioned at above the first distillation tray, wherein being removed from product tower by liquid/vapor product is product exit by being communicated with streamline flow body, wherein product exit is positioned at above after-fractionating column plate, and wherein the first distillation tray below after-fractionating column plate.
18. methods as claimed in claim 14, wherein about 8th column plate of feed stream above the bottom of product tower to the about the 15th column plate place enters product tower.
Liquid/vapor product is wherein 80% to 97% of the flow velocity of feed stream from the flow velocity that product tower removes by a streamline by 19. methods as claimed in claim 15.
20. methods as claimed in claim 14, wherein product tower is left at about 33rd column plate of tributary above the bottom of product tower to the about the 37th column plate place.
21. methods as claimed in claim 15, it is further comprising the steps: the bottom of liquid from product tower removes by the flow velocity with 1% to 10% of the flow velocity of feed stream.
22. methods as claimed in claim 15, it is further comprising the steps: make fluid stream be circulated through heat exchanger again from the top exit at top on the top being positioned at product tower and leave open-topped fluid with cooling, and product tower is got back in the position below top exit.
23. methods as claimed in claim 22, it is further comprising the steps: a part for removing fluids after fluid is by cools down, make like this remove part and can not circulate again together with all the other fluids by described cools down and get back to product tower.
24. methods as claimed in claim 23, wherein the flow velocity of the feed stream flow velocity, the flow velocity of liquid removed from the bottom of product tower and the flow velocity of liquid that removes from fluid flow after by cools down that equal the liquid/vapor product removed from product tower by streamline and.
25. 1 kinds of methods, it comprises:
Feed stream is supplied to product tower, product tower comprises top, middle part and bottom, and wherein middle part comprises a series of distillation tray;
Feed stream in product of distillation tower, to obtain the liquid/vapor product purer than feed stream;
Removed from product tower by liquid/vapor product by a streamline, a streamline comprises control valve, and wherein control valve is controlled by a stream controller;
Detect the tower bottom product liquid level in the bottom of product tower; Detected tower bottom product liquid level and predetermined set liquid level are compared;
When detected tower bottom product liquid level is outside preset range, the flow velocity that arranges of stream controller is reset to and new arranges flow velocity; And
Adjusting control valve is carried out according to the new flow velocity that arranges.
26. 1 kinds of methods, it comprises:
Feed stream is supplied to product tower, product tower comprises top, middle part and bottom, and wherein middle part comprises a series of distillation tray;
Feed stream in product of distillation tower, to obtain the liquid/vapor product purer than feed stream;
Removed from product tower by liquid/vapor product by a streamline, a streamline comprises control valve, and wherein control valve is controlled by a stream controller;
Detect the flow velocity of the feed stream arriving product tower;
The flow velocity of detected feed stream and predetermined feed speed are compared;
When the flow velocity of the feed stream of detected arrival product tower is outside predetermined feed speed scope, the flow velocity that arranges of stream controller is reset to and new arranges flow velocity; And
The new flow velocity that arranges according to a stream controller carrys out adjusting control valve.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410080189.XA CN104888489A (en) | 2014-03-06 | 2014-03-06 | Acrylonitrile product tower liquid level control method |
| PCT/US2015/018902 WO2015134718A1 (en) | 2014-03-06 | 2015-03-05 | Acrylonitrile product column level control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410080189.XA CN104888489A (en) | 2014-03-06 | 2014-03-06 | Acrylonitrile product tower liquid level control method |
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| CN104888489A true CN104888489A (en) | 2015-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410080189.XA Pending CN104888489A (en) | 2014-03-06 | 2014-03-06 | Acrylonitrile product tower liquid level control method |
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| Country | Link |
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| CN (1) | CN104888489A (en) |
| WO (1) | WO2015134718A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106892838A (en) * | 2015-12-17 | 2017-06-27 | 英尼奥斯欧洲股份公司 | Recovery tower is controlled |
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| WO2015134718A1 (en) | 2015-09-11 |
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