CN104922926A - Head fraction tower tower-top system - Google Patents
Head fraction tower tower-top system Download PDFInfo
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- CN104922926A CN104922926A CN201410107192.6A CN201410107192A CN104922926A CN 104922926 A CN104922926 A CN 104922926A CN 201410107192 A CN201410107192 A CN 201410107192A CN 104922926 A CN104922926 A CN 104922926A
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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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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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Abstract
A device comprises a head fraction tower and a tower-top system, the head fraction tower is arranged to receiving of a crude product nitrile raw material flow, the head fraction tower is arranged for distilling of the crude product nitrile raw material flow under partial vacuum and production of a HCN-containing head fraction tower top material flow which is on the top of the head fraction tower and an acrylonitrile product-containing head fraction tower bottom liquid material flow which is on the bottom of the head fraction tower, the head fraction tower comprises a condenser arranged for condensing of the head fraction tower top material flow, the device comprises a seal-pad-free pump, the pump is arranged for pumping at least part of the head fraction tower top material flow back to the head fraction tower after the head fraction tower top material flow is condensed in the condenser.
Description
Invention field
The present invention relates to a kind of method of the improvement for the manufacture of acrylonitrile and methacrylonitrile.Particularly, the present invention relates to head fraction column (heads column) the tower top process of the improvement of hydrogen cyanide (HCN).
Background of invention
Become known for the multiple method and system manufacturing acrylonitrile and methacrylonitrile; See such as, U.S. Patent number 6,107,509.As U.S. Patent number 6, 107, record in 509, conventional method is usually directed to (be selected from propane completing hydrocarbon, propylene or isobutene), after the direct reaction in the presence of a catalyst of ammonia and oxygen, acrylonitrile/the methacrylonitrile of recovery and purifying generation by the following method: the reactor effluent containing acrylonitrile/methacrylonitrile is delivered to the first tower (quenching), wherein use the first aqueous stream cooling reactor effluent, the effluent containing acrylonitrile/methacrylonitrile through cooling is delivered to the second tower (absorber), effluent wherein through cooling contacts to absorb in the second aqueous stream by acrylonitrile/methacrylonitrile with the second aqueous stream, the second aqueous stream containing acrylonitrile/methacrylonitrile is delivered to the first destilling tower (recovery tower) from the second tower be separated with the second aqueous stream for making crude product acrylonitrile/methacrylonitrile, with the crude product be separated acrylonitrile/methacrylonitrile is delivered to after-fractionating tower (head fraction column) with from crude product acrylonitrile/methacrylonitrile removing at least some impurity, with partially purified acrylonitrile/methacrylonitrile is delivered to the 3rd destilling tower (product tower) to obtain product acrylonitrile/methacrylonitrile.U.S. Patent number 4,234,510; 3,885,928; 3,352,764; The typical recovery of 3,198,750 and 3,044,966 explanation acrylonitrile and methacrylonitrile and purification process.
Acrylonitrile manufacture method produces the HCN accessory substance of very toxicity.In equipment operating or maintenance period, be exposed to HCN to make people and minimize, usefully make the equipment that can process HCN have low risk of leakage.One method is the demand that the flowing of use gravity eliminates to pump in HCN use (service).But, in acrylonitrile equipment HCN tower or head fraction column, pollute (particularly the pollution of column plate) and usually become problem.
Summary of the invention
Therefore, one side of the present disclosure provides a kind of shortcoming safe, effectively and the method and apparatus of cost-effective overcoming or reduce conventional method.
On the one hand, described equipment comprises head fraction column and overhead system (overhead system).Described head fraction column is arranged to accept crude product nitrile feed stream.Distill crude product nitrile feed stream while described head fraction column operates under being arranged in partial vacuum, and produce and comprise the head fraction column overhead stream of HCN and the bottoms liquid stream comprising acrylonitrile product bottom head fraction column at head fraction column top.Described overhead system comprises the condenser being arranged to condensation head fraction column overhead stream.Described equipment comprises nongasketed pump.Described pump is arranged within the condenser after condensation head fraction column overhead stream, and pumping is head fraction column overhead stream at least partially.
Above and other aspects, features and advantages of the present disclosure are apparent by the detailed description of the embodiment of its band accompanying drawing, and described embodiment should be read by reference to the accompanying drawings.
Accompanying drawing is sketched
In consideration of the drawings by reference to the following description, can obtain the more complete understanding to exemplary of the present invention and advantage thereof, wherein identical Reference numeral indicates identical feature, wherein:
Fig. 1 is the indicative flowchart being applied to the embodiment according to disclosure each side that acrylonitrile product manufactures.
Fig. 2 illustrates the flow chart according to the method for disclosure each side.
Fig. 3 illustrates the flow chart according to the method for disclosure each side.
Fig. 4 is the indicative flowchart being applied to the alternative embodiment according to disclosure each side that acrylonitrile product manufactures.
Describe in detail
The recovery section of acrylonitrile equipment produces crude product nitrile feed stream, and it is the mixture comprising acrylonitrile, HCN and water.Procedure of processing in acrylonitrile purification is by distillation removing HCN accessory substance.HCN tower, head fraction column or head fraction drying tower is called from the destilling tower of crude product nitrile feed stream removing HCN.Use this destilling tower, can be used as high-purity overhead product and reclaim HCN.
In acrylonitrile equipment HCN tower or head fraction column, column plate pollutes and usually becomes problem.Found to reduce the pressure in HCN tower or head fraction column, such as, run HCN tower or head fraction column under partial vacuum, significantly reduce pollute and extend HCN tower or head fraction column clean between running time.But under reduced pressure operation HCN tower or head fraction column need lower condensation temperature and need to use larger condenser.As a result, the condenser being designed for the head fraction column that vacuum uses usually too large and can not physics be arranged on head fraction column top or close to top.If condenser is arranged in the supporting construction close to head fraction column downwards, (or multiple) pump can be used for providing backflow for head fraction column and/or HCN accessory substance being delivered to HCN user and/or HCN storage and/or dispose (disposal).
In one side of the present disclosure, nongasketed pump (such as, the pump of magnetic coupling and/or the pump of not directly connection between motor shaft and impeller) can be used for the overhead system of head fraction column.By using nongasketed pump, HCN risk of leakage can minimize, because such pump does not have the driving sealing that can leak, and there is not the heat transfer of the fluid from motor to pumping.
Method and apparatus of the present disclosure is described in detail with reference to figure 1.
Equipment 10 is in the downstream of the recovery tower (not showing in FIG) for acrylonitrile manufacture method.Equipment 10 comprises head fraction column 12 and overhead system 14.Head fraction column 12 is arranged to distillation crude product nitrile feed stream 1, and production mainly comprises the acrylonitrile of HCN and trace and the head fraction column overhead stream 2 of water.Crude product nitrile feed stream 1 can comprise the acrylonitrile of about 82-about 90 % by weight, and the HCN of about 5-about 13 % by weight, and the surplus of composition is water.In this, the component of pollution can be caused to depend on the type of inhibitor used.
Overhead system 14 comprises the condenser 16 being arranged to condensation head fraction column overhead stream 2.Overhead system 14 comprises nongasketed pump 18.On the one hand, head fraction column 12 distills crude product nitrile feed stream 1 while operating under can being arranged in partial vacuum.On the one hand, head fraction column 12 distills crude product nitrile feed stream 1 while operating under can being arranged in the partial vacuum of 0.044-0.090 MPa absolute pressure.In one embodiment, head fraction column 12 is distill crude product nitrile feed stream 1 under the partial vacuum of about 0.075MPa absolute pressure at top pressure.Fluid in head fraction column 12 is by reboiler (not showing in FIG) for subsequent use heating, and this reboiler can be usually used in heating the fluid in head fraction column 12 and the fluid in the product tower (not showing in FIG) in head fraction column 12 downstream.Poor-water can be used as the thermal source of (or multiple) reboiler.
Head fraction column 12 comprises multiple column plate.In one embodiment, head fraction column 12 comprises 52 (52)-seven ten two (72) individual column plates.In one embodiment, head fraction column 12 comprises 62 (62) individual column plates.Head fraction column 12 can be arranged in column plate 28 place and accept crude product nitrile feed stream 1.In one embodiment, column plate 28 can be the 42nd, the bottom column plate apart from head fraction column 12.In an alternate embodiment, column plate 28 can be the 38th, the bottom column plate apart from head fraction column 12.In an alternate embodiment, column plate 28 can be the 47th, the bottom column plate apart from head fraction column 12, and head fraction column 12 can comprise 67 (67) individual column plates.In one embodiment, the dry acrylonitrile product of the 1st-20 bottom tray of head fraction column 12.In one embodiment, apart from the 21st, bottom 34-42 column plate removings and the purifying HCN of head fraction column 12.In one embodiment, head fraction column 12 can not be with functions/drying to operate.In one embodiment, head fraction column 12 comprises 40 (40)-six ten five (65) individual column plates.In one embodiment, feed tray 28 between the 20th-in bottom 30 column plates apart from head fraction column, can comprise the 20th column plate and the 30th column plate.
Condenser 16 can be arranged to accept cooling or freezing water (RW) flow 4.Freezing current 4 can comprise antifreezing agent, and the inlet temperature of leading to condenser 16 is about-10 to 5 DEG C.On the one hand, condenser 16 can be positioned at close to head fraction column 12, but not at the top of head fraction column 12.Condenser 16 (comprising suitable size) can be arranged to the lower temperature adapting to operate under partial vacuum needed for head fraction column 12.Lower temperature for operating head fraction column 12 can be-10 to+10 DEG C.
Nongasketed pump 18 can be used for the condensator outlet logistics 6 mainly comprising HCN that pumping carrys out condenser 16.Condensator outlet logistics 6 can punish into reflux stream 3 and HCN by-product stream 5 at contact 7.On the one hand, HCN by-product stream 5 can be delivered to HCN user, HCN storage or dispose.
Reflux stream 3 can flow to head fraction column 12.System can utilize the reflux ratio of about 2-about 7, on the other hand, and the reflux ratio of about 2-about 6.5, on the other hand, the reflux ratio of about 3-about 6.On the one hand, reflux stream 3 can be accepted in the top tray 30 of head fraction column 12.In one embodiment, the top tray 30 of head fraction column 12 can be the 62nd, the bottom column plate apart from head fraction column 12.On the one hand, by being arranged to the flow controller 8 of control valve 9 to regulate the flow of reflux stream 3.Flow controller 8 controls by temperature controller 20.Temperature controller 20 can be positioned at middle column plate 32 place of the head fraction column 12 of the top tray 30 lower than head fraction column 12.On the one hand, controller 68 can be arranged to process the one or more signals corresponding to measurement parameter (such as, by temperature that temperature controller 20 is measured).Controller 68 can be arranged to measurement parameter be higher than or lower than predetermined parameter area, such as, the temperature measured by temperature controller 20 is below or above predetermined temperature range.If the parameter measured is below or above predetermined parameter area, controller 68 can be arranged to the operation regulating one or more device via communication line or wireless telecommunications (not showing in FIG).Such as, when the temperature measured by temperature controller 20 is below or above predetermined temperature range, controller 68 can be arranged to regulate the amount of the reflux stream 3 flowing to head fraction column 12.Controller 68 can be arranged to the operation of control pump 18 and/or the operation of valve 9, the size of the such as perforate of control valve 9.Those skilled in the art recognize that, controller 68 or similar controller can be positioned at away from flow controller 8 (as shown in FIG. 1), or can be positioned at flow controller 8 place and comprise flow controller 8.
Condenser 16 can comprise condenser feed bin (boot) 22 and fluid level controller 27.Fluid level controller 27 can be arranged to the liquid level of the liquid controlling condensation in condenser feed bin 22.As shown in FIG. 1, fluid level controller 27 can be arranged through the perforate regulating product valve 25 and the liquid level controlling the liquid of condensation in condenser feed bin 22.As shown in FIG. 1, valve 25 can be positioned at the downstream of condenser 16.In one embodiment, controller 68 can be arranged to process the signal corresponding to the measurement parameter liquid level of liquid (in the condenser feed bin 22 such as, measured by fluid level controller 27).Controller 68 can be arranged to the liquid level measured by fluid level controller 27 be higher than or lower than the predetermined liquid liquid level scope of condenser feed bin 22.If the liquid level measured in condenser feed bin 22 is higher or lower than the predetermined liquid level scope of condenser feed bin 22, controller 68 can be arranged to the operation regulating one or more device via communication line or wireless telecommunications (not showing in FIG).Such as, when the liquid level scope of predetermined of the liquid level measured in condenser feed bin 22 higher or lower than condenser feed bin 22, controller 68 can be arranged to the size of the perforate of control valve 25.Those skilled in the art recognize that, controller 68 or similar controller can be positioned at away from fluid level controller 27 (as shown in FIG. 1), or can be positioned at fluid level controller 27 place and comprise fluid level controller 27.
The liquid stream 26 comprising acrylonitrile can remove from the bottom of tower 12.Liquid stream 26 can be led to product tower (not showing in FIG).Or, liquid stream 26 can be led to drying tower, such as, drying tower in the 3-tower purification system comprising head fraction column, drying tower and product tower.
Fig. 4 is the indicative flowchart according to the alternative embodiment being applied to the aspect of the present disclosure that acrylonitrile product manufactures.Fig. 4 is similar with the indicative flowchart being shown in Fig. 1.As shown in FIG. 4, flow controller 40 and temperature controller 20 and valve 25 electrical communication.As shown in FIG. 4, flow controller 8 and fluid level controller 27 and valve 9 electrical communication.
As in FIG, in the diagram, controller 68 can be arranged to process the one or more signals corresponding to measurement parameter (such as, by temperature that temperature controller 20 is measured).Controller 68 can be arranged to measurement parameter be higher than or lower than predetermined parameter area, such as, the temperature measured by temperature controller 20 is below or above predetermined temperature range.If the parameter measured is below or above predetermined parameter area, controller 68 can be arranged to the operation regulating one or more device via communication line or wireless telecommunications (not showing in the diagram).Such as, when the temperature measured by temperature controller 20 is below or above predetermined temperature range, controller 68 can be arranged to regulate the amount of the reflux stream 3 flowing to head fraction column 12.Controller 68 can be arranged to the operation of the operation of control pump 18 and/or the operation of valve 9 and/or valve 25, the size of the such as perforate of control valve 9 and/or valve 25.By the size of the perforate of control valve 25, controller 68 controls otherwise can flow through the flow through valve 25 of valve 9.Those skilled in the art recognize that, controller 68 or similar controller can be positioned at away from flow controller 8 and flow controller 40 (as shown in FIG. 4), or can be positioned at flow controller 8 and/or flow controller 40 place and comprise flow controller 8 and/or flow controller 40.
As in FIG, in the diagram, controller 68 can be arranged to process the signal corresponding to the measurement parameter liquid level of liquid (in the condenser feed bin 22 such as, measured by fluid level controller 27).Controller 68 can be arranged to the liquid level measured by fluid level controller 27 be higher than or lower than the predetermined liquid liquid level scope of condenser feed bin 22.If the parameter measured is below or above predetermined parameter area, controller 68 can be arranged to the operation regulating one or more device via communication line or wireless telecommunications (not showing in the diagram).Such as, when the liquid level in the condenser feed bin 22 measured by fluid level controller 27 is below or above predetermined liquid level scope, controller 68 can be arranged to regulate the amount of the reflux stream 3 flowing to head fraction column 12.Controller 68 can be arranged to the operation of the operation of control pump 18 and/or the operation of valve 9 and/or valve 25, the size of the such as perforate of control valve 9 and/or valve 25.By the size of the perforate of control valve 9, controller 68 controls otherwise can flow through the flow through valve 9 of valve 25.Those skilled in the art recognize that, controller 68 or similar controller can be positioned at away from flow controller 8 and flow controller 40 (as shown in FIG. 4), or can be positioned at flow controller 8 and/or flow controller 40 place and comprise controller 8 and/or flow controller 40.
Fig. 2 illustrates the flow chart according to the method 200 of aspect of the present disclosure.Method 200 can use previously described equipment to carry out.In step 201, occur in the head fraction column comprising multiple column plate and accept crude product nitrile feed stream.In step 201, crude product nitrile feed stream can be accepted occurring in head fraction column apart from the column plate place of 38-the 47th column plate bottom head fraction column.In step 202., occur in head fraction column, distill crude product nitrile feed stream under partial vacuum, comprise the head fraction column overhead stream of HCN and the bottoms liquid stream comprising acrylonitrile product bottom head fraction column to produce at head fraction column top.In step 203, there is condensation head fraction column overhead stream within the condenser.In step 204, within the condenser after condensation, occur to use pump that head fraction column overhead stream is at least partially pumped to head fraction column as reflux stream and/or be pumped to that HCN stores, HCN user or at least one in disposing.In step 205, occur in head fraction column and accept reflux stream.As mentioned above, about each side of the present disclosure of equipment, in step 205, can occur in head fraction column at the top tray place of head fraction column and accept reflux stream.
Method 200 also can comprise other step (not showing in fig. 2).The such as method 200 predetermined column plate place that also can be included between the top tray and the column plate accepting crude product nitrile feed stream of head fraction column measures the step of the temperature of fluid.Method 200 also can comprise adjustment and lead to the flow of the reflux stream of head fraction column to keep fluid in the step of temperature in predetermined temperature range at predetermined column plate place.Method 200 also can comprise the liquid level of the liquid of condensation in the feed bin 22 controlling condenser 16 in the step of predetermined liquid level scope, and this step is undertaken by the valve regulating at least one and be positioned at condenser 16 downstream.
Fig. 3 illustrates the flow chart according to the method 300 of aspect of the present disclosure.Method 300 can be similar with method 200.In step 301, occur in the head fraction column comprising multiple column plate and accept crude product nitrile feed stream.In step 301, in head fraction column, accept crude product nitrile feed stream to occur at the column plate place of 38-the 47th column plate bottom head fraction column.In step 302, occur in head fraction column, distill crude product nitrile feed stream under partial vacuum, comprise the head fraction column overhead stream of HCN and the bottoms liquid stream comprising acrylonitrile product bottom head fraction column to produce at head fraction column top.In step 303, there is condensation head fraction column overhead stream within the condenser.In step 304, within the condenser after condensation, occur head fraction column overhead stream at least partially to deliver to head fraction column as reflux stream and/or deliver to that HCN stores, HCN user or at least one in disposing.To head fraction column be delivered to as reflux stream and may comprise or pumping reflux stream may not be comprised by head fraction column overhead stream at least partially.In step 305, occur in head fraction column and accept reflux stream.As mentioned above, about each side of the present disclosure of equipment, in step 305, in head fraction column, accept reflux stream to occur at the top tray place of head fraction column.
Method 300 also can comprise other step (not showing in figure 3).Such as method 300 also can be included in the step of the temperature of the first predetermined column plate and the second predetermined column plate place mensuration fluid, and the first and second predetermined column plates are separately between the top tray of head fraction column and the column plate accepting crude product nitrile feed stream.Method 300 also can comprise and regulates the flow that leads to the reflux stream of head fraction column to keep the temperature of fluid at the first predetermined column plate place in the first predetermined temperature range, and the flow of adjustment reflux stream is to keep the step of the temperature of fluid at the second predetermined column plate place in the second predetermined temperature range.On the one hand, the first predetermined temperature range causes starting the temperature polluted at the first predetermined column plate place at the first predetermined temperature range lower than fluid.On the one hand, the second predetermined temperature range causes starting the temperature polluted at the second predetermined column plate place at the second predetermined temperature range lower than fluid.Method 300 also can comprise the step of Liquid level within the scope of predetermined liquid level of the liquid of condensation in the feed bin 22 by condenser 16, and this step is undertaken by the valve that regulates at least one and be positioned at condenser 16 downstream.
Although about it, some preferred embodiment describes the disclosure in the description above, and the object just illustrated, many details have been described, it will be evident to one skilled in the art that, the disclosure allows other embodiments, and when not departing from basic principle of the present disclosure, some details described herein can marked change.It should be understood that when not departing from spirit and scope of the present disclosure or not departing from the scope of claim, feature of the present disclosure is allowed amendment, change, is changed or substitute.Such as, the size of each parts, quantity, size and shape can change, to adapt to concrete application.Therefore, illustrate herein and the specific embodiments that describes only for purposes of illustration.
Claims (32)
1. an equipment, described equipment comprises:
Head fraction column, described head fraction column is arranged to accept crude product nitrile feed stream and distillation crude product nitrile feed stream, and produces and comprise the head fraction column overhead stream of HCN and the bottoms liquid stream comprising acrylonitrile product bottom head fraction column at head fraction column top;
Overhead system, described overhead system comprises the condenser being arranged to condensation head fraction column overhead stream; With
Pump, described pump is arranged in by after condenser condenses, head fraction column overhead stream is at least partially pumped to head fraction column as reflux stream and/or be pumped to that HCN stores, HCN user or at least one in disposing;
Wherein said head fraction column is arranged to distill crude product nitrile feed stream under partial vacuum.
2. the equipment of claim 1, distills crude product nitrile feed stream while wherein said head fraction column operates under being arranged in the partial vacuum of 0.044-0.090 MPa absolute pressure.
3. the equipment of claim 1, wherein said head fraction column comprises multiple column plate, and described multiple column plate comprises 52-72 column plate.
4. the equipment of claim 3, wherein said head fraction column comprises 62 column plates.
5. the equipment of claim 3, the top tray that wherein said head fraction column is arranged in head fraction column accepts reflux stream.
6. the equipment of claim 3, wherein said condenser is arranged to accept freezing current, for refrigerating head cut column overhead stream.
7. the equipment of claim 6, wherein said freezing current comprise antifreezing agent.
8. the equipment of claim 3, wherein said freezing current are about-10 to 5 DEG C in the inlet temperature of condenser.
9. the equipment of claim 1, wherein said head fraction column is arranged to the crude product nitrile feed stream of the HCN accepting to comprise the acrylonitrile of about 82-about 90 % by weight and about 5-about 13 % by weight.
10. the equipment of claim 3, the column plate place that wherein said head fraction column is arranged in apart from the 38th column plate bottom head fraction column to the 47th column plate accepts crude product nitrile feed stream.
The equipment of 11. claims 10, described equipment also comprises temperature controller and flow controller, the wherein said temperature controller predetermined column plate place be arranged between the top tray and the column plate accepting crude product nitrile feed stream of head fraction column measures the temperature of fluid, control flow check amount controller is arranged to by wherein said temperature controller, the valve regulating condenser downstream is arranged to by described flow controller, to control the flow leading to the reflux stream of head fraction column, wherein remain in predetermined temperature range in the fluid temperature (F.T.) at predetermined column plate place.
The equipment of 12. claims 10, wherein said condenser comprises condenser feed bin and fluid level controller, wherein said fluid level controller is arranged through the valve regulating at least one to be positioned at condenser downstream, controls the liquid level of the liquid of condensation in condenser feed bin within the scope of predetermined liquid level.
The equipment of 13. claims 12, at least one valve being positioned at condenser downstream wherein said is return valve on the reflux pipeline leading to head fraction column and/or the HCN product valve leading to that HCN stores, on the pipeline of HCN user or disposal.
The equipment of 14. claims 1, wherein said pump is nongasketed pump.
15. 1 kinds of methods, described method comprises:
Crude product nitrile feed stream is accepted in the head fraction column comprising multiple column plate;
Under partial vacuum, in head fraction column, distill crude product nitrile feed stream, comprise the head fraction column overhead stream of HCN and the bottoms liquid stream comprising acrylonitrile product bottom head fraction column to produce at head fraction column top;
Condensation head fraction column overhead stream within the condenser; With
Within the condenser after condensation, use pump that the head fraction column overhead stream of condensation is at least partially pumped to head fraction column as reflux stream and/or be pumped at least one in HCN storage, HCN user or disposal.
The method of 16. claims 15, the distillation of wherein said crude product nitrile feed stream is carry out under the partial vacuum of 0.044-0.090 MPa absolute pressure at top pressure.
The method of 17. claims 17, described method is also included in head fraction column and accepts reflux stream.
The method of 18. claims 17, wherein accepts the top tray place of reflux stream at multiple column plates of head fraction column in head fraction column.
The method of 19. claims 15, wherein said head fraction column is arranged to the crude product nitrile feed stream of the HCN accepting to comprise the acrylonitrile of about 82-about 90 % by weight and about 5-about 13 % by weight.
The method of 20. claims 17, is wherein accepting crude product nitrile feed stream apart from the 38th column plate bottom head fraction column to the column plate place of the 47th column plate.
The method of 21. claims 15, the described method predetermined column plate place be also included between the top tray and the column plate accepting crude product nitrile feed stream of head fraction column measures the temperature of fluid, the flow of the reflux stream of head fraction column is led to, to keep the temperature of predetermined column plate place fluid in predetermined temperature range with adjustment.
The method of 22. claims 15, described method also comprises the valve by regulating at least one to be positioned at condenser downstream, controls the liquid level of the liquid of condensation in condenser feed bin within the scope of predetermined liquid level.
23. 1 kinds of methods, described method comprises:
Crude product nitrile feed stream is accepted in the head fraction column comprising multiple column plate;
Under partial vacuum, in head fraction column, distill crude product nitrile feed stream, comprise the head fraction column overhead stream of HCN and the bottoms liquid stream comprising acrylonitrile product bottom head fraction column to produce at head fraction column top;
Condensation head fraction column overhead stream within the condenser; With
Within the condenser after condensation, the head fraction column overhead stream of condensation is at least partially delivered to head fraction column as reflux stream and/or delivers at least one in HCN storage, HCN user or disposal;
The temperature of fluid is measured at the predetermined column plate place between the top tray and the column plate accepting crude product nitrile feed stream of head fraction column, the flow of the reflux stream of head fraction column is led to, to keep the temperature of predetermined column plate place fluid in predetermined temperature range with adjustment.
The method of 24. claims 23, the distillation of wherein said crude product nitrile feed stream is under the partial vacuum of 0.044-0.090 MPa absolute pressure at top pressure.
The method of 25. claims 23, described method is also included in head fraction column and accepts reflux stream.
The method of 26. claims 25, wherein accepts the top tray place of reflux stream at multiple column plates of head fraction column in head fraction column.
The method of 27. claims 23, wherein said head fraction column is arranged to the crude product nitrile feed stream of the HCN accepting to comprise the acrylonitrile of about 82-about 90 % by weight and about 5-about 13 % by weight.
The method of 28. claims 26, is wherein accepting crude product nitrile feed stream apart from the 38th column plate bottom head fraction column to the column plate place of the 47th column plate.
The method of 29. claims 23, wherein said predetermined temperature range causes temperature when predetermined column plate place pollute at predetermined column plate place by starting lower than fluid.
The method of 30. claims 23, the wherein said temperature measuring fluid at predetermined column plate place is included in the temperature of the first predetermined column plate and the second predetermined column plate place mensuration fluid, the flow of the reflux stream of head fraction column is led to adjustment, with the temperature remaining on the first predetermined column plate place fluid in the first predetermined temperature range, and regulate and lead to the flow of the reflux stream of head fraction column, with the temperature remaining on the second predetermined column plate place fluid in the second predetermined temperature range.
The method of 31. claims 30, wherein said first predetermined temperature range causes temperature when first predetermined column plate place pollute at the first predetermined column plate place by starting lower than fluid, and wherein said second predetermined temperature range causes the temperature when the second predetermined column plate place pollutes lower than at fluid second predetermined column plate place by starting.
The method of 32. claims 23, described method also comprises the valve by regulating at least one to be positioned at condenser downstream, controls the liquid level of the liquid of condensation in condenser feed bin within the scope of predetermined liquid level.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410107192.6A CN104922926A (en) | 2014-03-21 | 2014-03-21 | Head fraction tower tower-top system |
| EA201691899A EA036895B8 (en) | 2014-03-21 | 2015-03-16 | Overhead product system of forerun column |
| PCT/US2015/020709 WO2015142718A1 (en) | 2014-03-21 | 2015-03-16 | Heads column overhead system |
| TW104109003A TWI639461B (en) | 2014-03-21 | 2015-03-20 | Heads column overhead system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410107192.6A CN104922926A (en) | 2014-03-21 | 2014-03-21 | Head fraction tower tower-top system |
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| Publication Number | Publication Date |
|---|---|
| CN104922926A true CN104922926A (en) | 2015-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410107192.6A Pending CN104922926A (en) | 2014-03-21 | 2014-03-21 | Head fraction tower tower-top system |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN104922926A (en) |
| EA (1) | EA036895B8 (en) |
| TW (1) | TWI639461B (en) |
| WO (1) | WO2015142718A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106699599A (en) * | 2015-11-16 | 2017-05-24 | 英尼奥斯欧洲股份公司 | Heads column pump circulation |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105366692B (en) * | 2015-12-04 | 2018-03-30 | 中国天辰工程有限公司 | A kind of high purity liquid HCN and system |
| EP3604222A1 (en) * | 2018-07-30 | 2020-02-05 | Evonik Operations GmbH | Process for the purification of hydrogen cyanide |
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- 2015-03-16 EA EA201691899A patent/EA036895B8/en not_active IP Right Cessation
- 2015-03-20 TW TW104109003A patent/TWI639461B/en active
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| CN1469765A (en) * | 2000-09-20 | 2004-01-21 | �����ɷ� | Method and device for carrying out the distillative separation of C5+ cuts |
| CN1417176A (en) * | 2002-12-10 | 2003-05-14 | 扬子石油化工股份有限公司 | Intelligent control method for ethylene rectifying tower of ethylene equipment |
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| CN103261150A (en) * | 2010-12-27 | 2013-08-21 | 旭化成化学株式会社 | Method for purifying acrylonitrile |
| CN202289528U (en) * | 2011-10-11 | 2012-07-04 | 浙江大学宁波理工学院 | Rectification experimental apparatus capable of safely showing flooding phenomenon in plate tower |
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Also Published As
| Publication number | Publication date |
|---|---|
| EA036895B1 (en) | 2021-01-12 |
| EA036895B8 (en) | 2021-02-16 |
| EA201691899A1 (en) | 2017-02-28 |
| TWI639461B (en) | 2018-11-01 |
| WO2015142718A1 (en) | 2015-09-24 |
| TW201544156A (en) | 2015-12-01 |
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