CA2203235A1 - Transition from continuous to intermittent process stage, method and device - Google Patents
Transition from continuous to intermittent process stage, method and deviceInfo
- Publication number
- CA2203235A1 CA2203235A1 CA 2203235 CA2203235A CA2203235A1 CA 2203235 A1 CA2203235 A1 CA 2203235A1 CA 2203235 CA2203235 CA 2203235 CA 2203235 A CA2203235 A CA 2203235A CA 2203235 A1 CA2203235 A1 CA 2203235A1
- Authority
- CA
- Canada
- Prior art keywords
- process stage
- continuous
- continuous process
- product
- stage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/008—Feed or outlet control devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
- B01J19/20—Stationary reactors having moving elements inside in the form of helices, e.g. screw reactors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00164—Controlling or regulating processes controlling the flow
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Basic Packing Technique (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
- Luminescent Compositions (AREA)
- Inorganic Insulating Materials (AREA)
- Container Filling Or Packaging Operations (AREA)
- Stacking Of Articles And Auxiliary Devices (AREA)
- Air Transport Of Granular Materials (AREA)
Abstract
A method and a device consisting of a continuous process stage and a subsequent intermittent process stage are described, the product outlet of the continuous process stage being provided with a retarding device which is operated at intervals, so that an intermediate buffer vessel is unnecessary.
Description
CA 0220323~ 1997-04-21 Mo4605 LeA 31,489-US/CA/FC
TRANSITION FROM CONTINUOUS TO INTERMITTENT
PROCESS STAGE, METHOD AND DEVICE
BACKGROUND OF THE INVENTION
A prerequisite for the economical manufacturing of products in the chemical, pharmaceutical or food industry is a process chain which is as free from interruptions as possible. If the individual process stages are continuous, they can be directly linked to one another. This is generally 5 the goal.
It is, however, often necessary to combine continuous process steps with intermittent, i.e., batch-type, process steps. This is generally the case when the intermittent process step can only be carried out as a continuous process step with a high technical expenditure, e.g., if a flow 10 of solid, granular material is to be conveyed between process stages in which the gas pressure differs or the subsequent process step requires a very narrow range of dwell time, as may be the case, for example, when producing polymeric molecules having the same molecular weight or in crystallization processes.
A continuous process stage is usually linked to a subsequent intermittent process stage via an intermediate buffer vessel into which there is a continuous feed from the continuous stage and from which the intermittent process stage is charged into the batch mode. A buffer vessel of this type is particularly complex in technical terms if certain 20 process engineering conditions such as temperature, atmosphere or movement have to be maintained for the product flow, which is to be buffered.
SUMMARY OF THE INVENTION
An object of the present invention is to link a continuous process 25 stage to a subsequent intermittent process stage for process engineering purposes without using an interposed buffer vessel. This object is solved ' CA 0220323~ 1997-04-21 Mo-4605 - 2 -in that the delivery of the product from the continuous process stage is interrupted at intervals by means of a retarding device.
This object and other objects which will be apparent to those skilled in the art are accomplished by the present invention which relates 5 to a method for operating a continuous process stage with a subsequent intermittent process stage without an interposed buffer vessel comprising the step of interrupting the delivery of a product from the continuous process stage at intervals by means of a retarding device.
The present invention is also directed to an apparatus utilizing the 10 above-mentioned method.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates the continuous process stage apparatus and the associated retarding device.
DETAILED DESCRIPTION OF THE INVENTION
The present invention is explained in detail on the basis of the accompanying Figure 1, which shows an example of a continuous process stage. A vessel 1 contains an agitator 3 which passes along the wall and is driven via the agitator shaft 2. The continuous process stage serves, for example, to evaporate solutions and/or suspensions to a dry 20 substance. The solution and/or suspension, which is to be evaporated, is fed continuously into the vessel 1 through the charging pipe 4. The vessel holds a bed of a solid granular substance 5, which may preferably consist of a previously produced dry substance, at a temperature above the evaporation temperature of the solution and/or suspension. The 25 vessel 1 also comprises a vapor discharge pipe 6, through which the evaporated solvent or suspension medium is discharged. The pressure in the gas space, which is located above the agitated dry substance 5, is between 10 and 100 mbar.
CA 0220323~ 1997-04-21 Mo-4605 - 3 -Special evaporation methods of this type are described, for example, in DE-A 4,430,591 and in DE-A 19,600,630.
An overflow pipe 7 is disposed at the height of the fill level of the vessel 1, through which the dry substance produced by evaporation in 5 the vessel 1 is discharged and, for example, delivered to an agitated cooling vessel, which is operated at a normal pressure. The cooling vessel has valves on the inlet and the outlet side and is operated intermittently.
According to the present invention, the overflow pipe 7 can be 10 closed at intervals by means of a retarding device. A retarding device, which comprises a retarding piston 8, can be moved in the direction of the axis 9 by means of a drive device 10 is shown as an example. As - long as the piston 8 performs a closing function (as shown), the fill level of the agitated bed rises from level A to level B. If the piston 8 is 15 retracted into position 8a, the fill level of the agitated vessel 1 very quickly drops from level B to level A. The dry substance leaving through the overflow pipe 7 enters the intermittently operated cooling vessel directly, without intermediate storage. The piston 8 is then returned to the retarding position, which results in the closing of the inlet valve of the 20 cooling vessel and the venting of the cooling vessel. After the dry substance has been cooled, the outlet valve of the cooling vessel is opened and the cooled batch is removed.
The method according to the present invention is particularly suitable for continuous process stages, which are carried out in large-25 volume and in only partly filled reactors such as, e.g., screw machines oragitator vessels. The method according to the present invention can be used advantageously if the dwell time in the continuous process stage is a multiple of the dwell time in the intermittent process stage. The batch of the intermittent process stage should preferably be less than 20%, and CA 0220323~ 1997-04-21 Mo-4605 - 4 -more preferably less than 15%, of the filling volume of the continuous process stage, so that the dwell time in the continuous process stage is only affected by the damming action within reasonable limits.
If, however, the required dwell time in the subsequent intermittent 5 stage exceeds the permissible dwell time variation in the continuous stage, two or more intermittent stages placed after the continuous stage, - with the interval frequency of the retarding device being doubled or multiplied accordingly, can compensate for the discrepancy in the dwell times. It is also possible to provide a separate retarding device for each 10 subsequent intermittent process stage, in which case, the retarding devices operate out-of-phase.
Valves, preferably slide valves or piston valves, which are, in each case, opened at intervals to fill the intermittent process stage, are suitable retarding devices. The continuous process stage continues to be 15 continuously charged when the retarding device is closed, such that the degree to which the continuous stage is filled, increases approximately by the batch volume of the intermittent stage.
The product is preferably removed from the continuous stage by means of an overflow, the lower level of which corresponds 20 approximately to the lower fill level of the continuous stage. The overflow is closed and opened at intervals by means of the retarding device.
If the product of the continuous process stage is a solid granular material, which is preferable, it is not necessary for the retarding device to provide a complete seal. It is, in this case, quite sufficient for the bulk 25 material flow to be interrupted. It is, on the contrary, advantageous to provide pressure equalization via the retarding device between the continuous process stage and the supply line to the intermittent process stage.
CA 0220323~ 1997-04-21 Mo-4605 - 5 -Although the invention has been described in detail in the foregoing for the purpose of illustration, it is to be understood that such detail is solely for that purpose and that variations can be made therein by those skilled in the art without departing from the spirit and scope of 5 the invention except as it may be limited by the claims.
TRANSITION FROM CONTINUOUS TO INTERMITTENT
PROCESS STAGE, METHOD AND DEVICE
BACKGROUND OF THE INVENTION
A prerequisite for the economical manufacturing of products in the chemical, pharmaceutical or food industry is a process chain which is as free from interruptions as possible. If the individual process stages are continuous, they can be directly linked to one another. This is generally 5 the goal.
It is, however, often necessary to combine continuous process steps with intermittent, i.e., batch-type, process steps. This is generally the case when the intermittent process step can only be carried out as a continuous process step with a high technical expenditure, e.g., if a flow 10 of solid, granular material is to be conveyed between process stages in which the gas pressure differs or the subsequent process step requires a very narrow range of dwell time, as may be the case, for example, when producing polymeric molecules having the same molecular weight or in crystallization processes.
A continuous process stage is usually linked to a subsequent intermittent process stage via an intermediate buffer vessel into which there is a continuous feed from the continuous stage and from which the intermittent process stage is charged into the batch mode. A buffer vessel of this type is particularly complex in technical terms if certain 20 process engineering conditions such as temperature, atmosphere or movement have to be maintained for the product flow, which is to be buffered.
SUMMARY OF THE INVENTION
An object of the present invention is to link a continuous process 25 stage to a subsequent intermittent process stage for process engineering purposes without using an interposed buffer vessel. This object is solved ' CA 0220323~ 1997-04-21 Mo-4605 - 2 -in that the delivery of the product from the continuous process stage is interrupted at intervals by means of a retarding device.
This object and other objects which will be apparent to those skilled in the art are accomplished by the present invention which relates 5 to a method for operating a continuous process stage with a subsequent intermittent process stage without an interposed buffer vessel comprising the step of interrupting the delivery of a product from the continuous process stage at intervals by means of a retarding device.
The present invention is also directed to an apparatus utilizing the 10 above-mentioned method.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates the continuous process stage apparatus and the associated retarding device.
DETAILED DESCRIPTION OF THE INVENTION
The present invention is explained in detail on the basis of the accompanying Figure 1, which shows an example of a continuous process stage. A vessel 1 contains an agitator 3 which passes along the wall and is driven via the agitator shaft 2. The continuous process stage serves, for example, to evaporate solutions and/or suspensions to a dry 20 substance. The solution and/or suspension, which is to be evaporated, is fed continuously into the vessel 1 through the charging pipe 4. The vessel holds a bed of a solid granular substance 5, which may preferably consist of a previously produced dry substance, at a temperature above the evaporation temperature of the solution and/or suspension. The 25 vessel 1 also comprises a vapor discharge pipe 6, through which the evaporated solvent or suspension medium is discharged. The pressure in the gas space, which is located above the agitated dry substance 5, is between 10 and 100 mbar.
CA 0220323~ 1997-04-21 Mo-4605 - 3 -Special evaporation methods of this type are described, for example, in DE-A 4,430,591 and in DE-A 19,600,630.
An overflow pipe 7 is disposed at the height of the fill level of the vessel 1, through which the dry substance produced by evaporation in 5 the vessel 1 is discharged and, for example, delivered to an agitated cooling vessel, which is operated at a normal pressure. The cooling vessel has valves on the inlet and the outlet side and is operated intermittently.
According to the present invention, the overflow pipe 7 can be 10 closed at intervals by means of a retarding device. A retarding device, which comprises a retarding piston 8, can be moved in the direction of the axis 9 by means of a drive device 10 is shown as an example. As - long as the piston 8 performs a closing function (as shown), the fill level of the agitated bed rises from level A to level B. If the piston 8 is 15 retracted into position 8a, the fill level of the agitated vessel 1 very quickly drops from level B to level A. The dry substance leaving through the overflow pipe 7 enters the intermittently operated cooling vessel directly, without intermediate storage. The piston 8 is then returned to the retarding position, which results in the closing of the inlet valve of the 20 cooling vessel and the venting of the cooling vessel. After the dry substance has been cooled, the outlet valve of the cooling vessel is opened and the cooled batch is removed.
The method according to the present invention is particularly suitable for continuous process stages, which are carried out in large-25 volume and in only partly filled reactors such as, e.g., screw machines oragitator vessels. The method according to the present invention can be used advantageously if the dwell time in the continuous process stage is a multiple of the dwell time in the intermittent process stage. The batch of the intermittent process stage should preferably be less than 20%, and CA 0220323~ 1997-04-21 Mo-4605 - 4 -more preferably less than 15%, of the filling volume of the continuous process stage, so that the dwell time in the continuous process stage is only affected by the damming action within reasonable limits.
If, however, the required dwell time in the subsequent intermittent 5 stage exceeds the permissible dwell time variation in the continuous stage, two or more intermittent stages placed after the continuous stage, - with the interval frequency of the retarding device being doubled or multiplied accordingly, can compensate for the discrepancy in the dwell times. It is also possible to provide a separate retarding device for each 10 subsequent intermittent process stage, in which case, the retarding devices operate out-of-phase.
Valves, preferably slide valves or piston valves, which are, in each case, opened at intervals to fill the intermittent process stage, are suitable retarding devices. The continuous process stage continues to be 15 continuously charged when the retarding device is closed, such that the degree to which the continuous stage is filled, increases approximately by the batch volume of the intermittent stage.
The product is preferably removed from the continuous stage by means of an overflow, the lower level of which corresponds 20 approximately to the lower fill level of the continuous stage. The overflow is closed and opened at intervals by means of the retarding device.
If the product of the continuous process stage is a solid granular material, which is preferable, it is not necessary for the retarding device to provide a complete seal. It is, in this case, quite sufficient for the bulk 25 material flow to be interrupted. It is, on the contrary, advantageous to provide pressure equalization via the retarding device between the continuous process stage and the supply line to the intermittent process stage.
CA 0220323~ 1997-04-21 Mo-4605 - 5 -Although the invention has been described in detail in the foregoing for the purpose of illustration, it is to be understood that such detail is solely for that purpose and that variations can be made therein by those skilled in the art without departing from the spirit and scope of 5 the invention except as it may be limited by the claims.
Claims (15)
1. A method for operating a continuous process stage with a subsequent intermittent process stage without an interposed buffer vessel comprising the step of interrupting the delivery of a product from said continuous process stage at intervals by a retarding device.
2. The method according to Claim 1, characterized in that said continuous process stage is in the form of a screw apparatus.
3. The method according to Claim 1, characterized in that said continuous process stage is in the form of an agitator vessel.
4. The method according to Claim 1, characterized in that said retarding device is in the form of a piston valve which closes a product delivery opening of said continuous process stage at intervals.
5. The method according to Claim 2, characterized in that said retarding device is in the form of a piston valve which closes a product delivery opening of said continuous process stage at intervals.
6. The method according to Claim 3, characterized in that said retarding device is in the form of a piston valve which closes a product delivery opening of said continuous process stage at intervals.
7. The method according to Claim 1, characterized in that said batch volume of said subsequent intermittent process stage is from 1/20 to 1/4 of a filling volume of said continuous process stage.
8. The method according to Claim 6, characterized in that a batch volume of said intermittent process stage is from 1/20 to 1/4 of a filling volume of said continuous process stage.
9. The method according to Claim 1, characterized in that said product of said continuous process stage is a solid granular material.
10. The method according to Claim 4, characterized in that said product of said continuous process stage is a solid granular material.
11. The method according to Claim 7, characterized in that said product of said continuous process stage is a solid granular material.
12. A continuous-intermittent process engineering apparatus comprising a retarding device which is provided on a product outlet side of a continuous stage apparatus and can be operated at intervals.
13. A continuous-intermittent process engineering apparatus comprising:
1) a process engineering device, which can be continuously charged with a product flow; and 2) a subsequent, intermittently operating process engineering device;
characterized in that, in the absence of an intermediate buffer vessel, said product flow of said apparatus, which can be continuously charged, can be fed directly into said intermittently operating process engineering device, and said process engineering device comprises a product outlet comprising a retarding device, which can be operated at intervals.
1) a process engineering device, which can be continuously charged with a product flow; and 2) a subsequent, intermittently operating process engineering device;
characterized in that, in the absence of an intermediate buffer vessel, said product flow of said apparatus, which can be continuously charged, can be fed directly into said intermittently operating process engineering device, and said process engineering device comprises a product outlet comprising a retarding device, which can be operated at intervals.
14. The apparatus according to Claim 13, wherein said retarding device is in the form of a piston valve which closes said product outlet.
15. The apparatus according to Claim 13 wherein the filling volume of said process engineering device, which can be continuously charged with said product flow, is from about 4 to 20 times the filling volume of said intermittently operating process engineering apparatus.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1996116361 DE19616361C1 (en) | 1996-04-24 | 1996-04-24 | Transition from continuous to discontinuous process stage, process and device |
| DE19616361.7 | 1996-04-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2203235A1 true CA2203235A1 (en) | 1997-10-24 |
Family
ID=7792305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2203235 Abandoned CA2203235A1 (en) | 1996-04-24 | 1997-04-21 | Transition from continuous to intermittent process stage, method and device |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0803285A3 (en) |
| JP (1) | JPH1043580A (en) |
| BR (1) | BR9701912A (en) |
| CA (1) | CA2203235A1 (en) |
| DE (1) | DE19616361C1 (en) |
| TW (1) | TW356431B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106179128B (en) * | 2016-08-19 | 2018-05-22 | 郭应权 | A kind of reaction kettle quantitative liquid feeding device and its application method |
| CN110773100A (en) * | 2019-10-28 | 2020-02-11 | 江苏华海三联净化材料有限公司 | Reaction device with improved structure for producing desulfurizer |
| CN112827452A (en) * | 2021-01-06 | 2021-05-25 | 长江师范学院 | A stirring reaction unit for among chemical experiment |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2491752A (en) * | 1945-11-15 | 1949-12-20 | Standard Oil Dev Co | Apparatus and method for polymerizing olefins |
| DE972895C (en) * | 1949-10-31 | 1959-10-22 | Koppers Gmbh Heinrich | Device for the continuous transfer of a finely divided solid material from a room with normal pressure into a room under increased pressure |
| NL101170C (en) * | 1951-03-22 | |||
| DE1054908B (en) * | 1951-09-22 | 1959-04-09 | Giovanni Rossi Dr Ing | Device for conveying small and / or powdery substances from one room into another room under pressure different from the first |
| DE1017016B (en) * | 1955-01-31 | 1957-10-03 | Meyer Hans | Device for the continuous removal of digested pulp from continuously operated pulp digesters |
| IL28461A (en) * | 1966-08-17 | 1970-06-17 | Universal Oil Prod Co | Liquid despensing apparatus providing an automatic intermittent supply |
| US3877881A (en) * | 1968-10-08 | 1975-04-15 | Mitsubishi Heavy Ind Ltd | Reactors for highly viscous materials |
| CH632939A5 (en) * | 1978-02-01 | 1982-11-15 | List Ind Verfahrenstech | Method and appliance for solidifying vapours, melts or pastes |
-
1996
- 1996-04-24 DE DE1996116361 patent/DE19616361C1/en not_active Expired - Fee Related
-
1997
- 1997-04-10 TW TW086104560A patent/TW356431B/en active
- 1997-04-11 EP EP97105991A patent/EP0803285A3/en not_active Withdrawn
- 1997-04-21 CA CA 2203235 patent/CA2203235A1/en not_active Abandoned
- 1997-04-22 JP JP11746897A patent/JPH1043580A/en active Pending
- 1997-04-23 BR BR9701912A patent/BR9701912A/en active Search and Examination
Also Published As
| Publication number | Publication date |
|---|---|
| EP0803285A2 (en) | 1997-10-29 |
| JPH1043580A (en) | 1998-02-17 |
| DE19616361C1 (en) | 1997-12-18 |
| TW356431B (en) | 1999-04-21 |
| BR9701912A (en) | 1999-02-09 |
| MX9702971A (en) | 1997-10-31 |
| EP0803285A3 (en) | 1998-06-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |