CN211189160U - Solvent negative pressure rectification system - Google Patents
Solvent negative pressure rectification system Download PDFInfo
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- CN211189160U CN211189160U CN201921729394.9U CN201921729394U CN211189160U CN 211189160 U CN211189160 U CN 211189160U CN 201921729394 U CN201921729394 U CN 201921729394U CN 211189160 U CN211189160 U CN 211189160U
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Abstract
The utility model belongs to the technical field of the menstruum is retrieved, in particular to menstruum negative pressure rectification system. The system comprises a waste liquid storage device, a preheating device, a decoloring tower kettle, a decoloring tower section, a dehydration tower, a re-decoloring tower section, a finished product condensing device, a finished product storage device and a vacuum pump for providing negative pressure; the preheating device is provided with at least two. The system can ensure the stable color grade of the product, and can prolong the cleaning maintenance period of the preheating device, thereby improving the production efficiency.
Description
Technical Field
The utility model belongs to the technical field of the menstruum is retrieved, in particular to menstruum negative pressure rectification system.
Background
The traditional butanol recovery process generally adopts a fractional rectification process, firstly carries out rough distillation once to remove impurities such as degradation products and the like in a solvent so as to ensure that the color grade is qualified, and then carries out normal pressure dehydration operation. According to the operation system of the process, along with the extension of the operation time, the impurities accumulated in the rough steaming kettle are increased gradually, so that the color grade of the product is reduced, the color grade of the product is unstable, and the equipment needs to be cleaned again to remove the impurities, so that the cleaning frequency of the equipment is increased, the production efficiency is reduced, and the operation and maintenance cost is increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a menstruum negative pressure rectification system, aim at solving the unstable, the many times cleaning equipment's of product color class problem in the present butanol recovery technology, can keep the color class of product stable to can prolong equipment cleaning cycle, reduce equipment and wash the number of times, improve production efficiency.
In order to achieve the above object, the utility model adopts the following technical scheme: providing a solvent negative pressure rectification system, which comprises a waste liquid storage device, a preheating device, a decoloring tower kettle, a decoloring tower section, a dehydration tower, a re-decoloring tower section, a finished product condensing device, a finished product storage device and a vacuum pump for providing negative pressure, wherein the waste liquid storage device, the preheating device, the decoloring tower kettle, the decoloring tower section, the dehydration tower, the re-decoloring tower section, the finished product condensing device and the finished product storage device are sequentially connected; the preheating device is provided with at least two preheating devices.
Furthermore, a vapor phase outlet of the dehydration tower is connected with a dehydration vapor phase condensation system, the dehydration vapor phase condensation system comprises a dehydration condensation device, a condenser and a tail condenser which are sequentially communicated according to the material flowing direction, and the vacuum pump is connected with the tail condenser.
Furthermore, the number of the preheating devices is two, namely a first preheating device and a second preheating device; the first preheating device is an interlayer or a pipeline surrounding a vapor phase container in the dehydration condensation device; or the dehydration condensing device is an interlayer or a pipeline surrounding the material container in the first preheating device; and a material outlet of the waste liquid storage device is connected with an inlet of the first preheating device, an outlet of the first preheating device is connected with an inlet of the second preheating device, and an outlet of the second preheating device is connected with an inlet of the decoloring tower kettle.
Further, a feed liquid pump is arranged between the second preheating device and the decoloring tower kettle.
Furthermore, the dehydration vapor phase condensation system is also provided with a phase separation tank, and a light phase outlet of the phase separation tank is connected with a reflux inlet of the dehydration tower.
Furthermore, the solvent negative pressure rectification system also comprises a reboiling device, the feed end of the reboiling device is connected with the condensed water outlet of the dehydration tower, and the vapor phase outlet of the reboiling device is connected with the vapor phase inlet of the dehydration tower.
Further, a condensed water outlet of the reboiling device is connected with an inlet of the second preheating device.
The utility model provides a menstruum negative pressure rectification system's beneficial effect lies in: the utility model discloses decoloration tower festival and decoloration tower festival again have been set up in this system to set up the dehydration tower between the two, make the preliminary decoloration of material through decoloration tower festival, then form the vapour in the dehydration tower and carry out the secondary decoloration mutually in decoloration tower festival again, thereby guaranteed the stability of product color class on the one hand, on the other hand has reduced the number of times of distillation, has reduced the technology energy consumption. Preheating device is equipped with at least two, can carry out two-stage or multistage preheating to the waste liquid to reduce the required heating temperature of each grade preheating, can prolong preheating device's washing maintenance cycle one time, make production efficiency improve about 50%.
Drawings
Fig. 1 is a schematic overall flow chart of an embodiment of the present invention.
In the figure:
1. a waste liquid storage device; 2. a first preheating device; 3. a second preheating device; 4. a decoloring tower kettle; 5. a decoloration tower section; 6. a dehydration tower; 7. a dehydration condensing device; 8. a condenser; 9. a tail condenser; 10. a phase splitting tank; 11. then decoloring tower sections; 12. a finished product condensing device; 13. a finished product storage device; 14. a vacuum pump; 15. a feed liquid pump; 16. a reboiling device.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a solvent negative pressure rectification system provided by the present invention will now be described. The rectification system comprises a waste liquid storage device 1, a preheating device, a decoloring tower kettle 4, a decoloring tower section 5, a dehydration tower 6, a re-decoloring tower section 11, a finished product condensing device 12, a finished product storage device 13 and a vacuum pump 14 for providing negative pressure, wherein the waste liquid storage device, the preheating device, the decoloring tower kettle 4, the decoloring tower section 5, the dehydration tower 6, the re-decoloring tower section 11, the finished product condensing device 12 and the finished product; the preheating device is provided with at least two.
The utility model provides a menstruum negative pressure rectification system's beneficial effect lies in: the utility model discloses decoloration tower festival 5 has been set up in this system and decoloration tower festival 11 again to set up dehydration tower 6 between the two, make the material through the preliminary decoloration of decoloration tower festival 5, then form the vapour in dehydration tower 6 and mutually carry out the secondary decoloration in decoloration tower festival 11 again, thereby guaranteed the stability of product color class on the one hand, on the other hand has reduced the distillated number of times, has reduced the technology energy consumption. The preheating device is provided with at least two preheating devices, and can preheat the waste liquid in two or multiple stages, so that the heating temperature required by preheating in each stage is reduced, the cleaning and maintenance period of the preheating device can be prolonged by one time, and the production efficiency of the system is improved by about 50%.
As a specific implementation mode provided by the solvent negative pressure rectification system, the dehydration vapor phase condensation system comprises a dehydration condensation device 7, a condenser 8 and a tail condenser 9 which are sequentially communicated according to the material flowing direction, and a vacuum pump 14 is connected with the tail condenser 9. The dehydration vapor phase condensation system can condense the vapor phase generated by the dehydration tower 6, and the condensed product can be used for recycling or other purposes.
As a specific embodiment provided by the solvent negative pressure rectification system of the present invention, the preheating devices are two, and are respectively the first preheating device 2 and the second preheating device 3, as shown in fig. 1, the first preheating device 2 is a pipeline wrapped around the vapor phase container in the dehydration and condensation device 7. The first preheating device 2 may also be a sandwich layer surrounding a vapor phase container in the dehydration condensation device 7, which is not limited by the present invention. As another specific embodiment provided by the solvent negative pressure rectification system of the present invention, the dehydration condensation device 7 may also be an interlayer or a pipeline wrapped around the material container in the first preheating device 2. The contact with the dehydration condensation device 7 through the first preheating device 2; the material outlet of the waste liquid storage device 1 is connected with the inlet of the first preheating device, the outlet of the first preheating device is connected with the inlet of the second preheating device 3, and the outlet of the second preheating device 3 is connected with the inlet of the decoloring tower kettle 4. The dehydration condensing unit 7 can directly transmit the heat generated by the vapor phase in the condensation dehydration tower 6 to the first preheating device 2, so that the material transmitted into the waste liquid storage device 1 is preheated in one stage, the heat energy can be effectively utilized and avoided being wasted, the heat energy consumption required by the preheated material is saved, and the running cost of the system is reduced. In the operation process of the solvent negative pressure rectification system, the preheating device can recover heat of about 0.37MkJ/hr, and can save steam by 210 kg/hr.
As a specific embodiment provided by the solvent negative pressure rectification system, the liquid feed pump 15 is arranged between the second preheating device 2 and the decoloring tower kettle 4, and is used for pumping the feed liquid into the decoloring tower kettle 4 from the second preheating device 2 automatic pump.
As a specific implementation mode that the utility model discloses menstruum negative pressure rectification system provided, dehydration vapor phase condensing system still are equipped with phase splitting jar 10, and phase splitting jar 10's light phase export meets dehydration tower 6's backward flow entry to can retrieve the condensation product, improve the rate of recovery of butanol, and reduce the dehydration volume.
As a specific implementation mode that the utility model discloses menstruum negative pressure rectification system provided, still include reboiling device 16, the water outlet that congeals of the feed termination dehydration tower 6 of reboiling device 16, the vapor phase outlet of reboiling device 16 connects the vapor phase entry of dehydration tower 6 to can heat once more, dewater once more to the water that congeals that produces in the dehydration tower 6, reduced dehydration volume and dehydration operation.
As a specific embodiment provided by the solvent negative pressure rectification system, the condensed water outlet of the reboiling device 16 is connected with the inlet of the second preheating device 3, and is used for reheating the condensed water generated in the reboiling device 16 and making the condensed water enter the system for reutilization.
The utility model provides an operation flow that its technical problem adopted is:
the vacuum pump 14 is turned on to place the entire system in a negative pressure state. The waste liquid containing butanol is preheated by the first preheating device 2 from the waste liquid storage device 1, enters the second preheating device 3 for secondary preheating, the material is heated to about 68 ℃, and then is pumped into the decoloring tower kettle 4 through the material liquid pump 15, the vapor phase distilled from the decoloring tower kettle 4 enters the dehydrating tower 6 after passing through the decoloring tower section 5, and the condensate water flows back to the second preheating device 3 for secondary preheating and enters the circulation again.
The vapor phase formed in the dehydration tower 6 by the material entering the dehydration tower 6 enters the dehydration condensing device 7, provides heat for the dehydration condensing device 7, is used for carrying out primary preheating on the waste liquid flowing into the first preheating device 2 from the waste liquid storage device 1 (the temperature of the material can reach about 54 ℃ after the material is preheated by the primary preheating), then enters the condenser 8, then enters the tail condenser 9, and then flows into the phase separation tank 10 completely. When the liquid level in the phase separation tank 10 reaches half of the tank volume, a light phase and heavy phase extraction valve of the phase separation tank 10 and a reflux valve at the top of the dehydration tower 6 are opened, so that the light phase flows back to the dehydration tower 6, then enters a re-decoloring tower section 11 from the dehydration tower 6, enters a finished product storage device 13 after being condensed by a finished product condensing device 12, and the heavy phase in the phase separation tank 10 is discharged out of the solvent negative pressure rectification system. The condensed water in the dehydrating tower 6 flows into the reboiling device 16, the reboiling device 16 heats the condensed water, the vapor phase flows back to the dehydrating tower 6 for continuous dehydration, and the condensed water flows into the second preheating device 3 for secondary preheating and enters the circulation.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A menstruum negative pressure rectification system is characterized in that: the system comprises a waste liquid storage device, a preheating device, a decoloring tower kettle, a decoloring tower section, a dehydration tower, a re-decoloring tower section, a finished product condensing device, a finished product storage device and a vacuum pump for providing negative pressure, wherein the waste liquid storage device, the preheating device, the decoloring tower kettle, the decoloring tower section, the dehydration tower, the re-decoloring tower section, the finished product condensing device and the finished product storage device are; the preheating device is provided with at least two preheating devices.
2. The solvent negative pressure rectification system of claim 1, wherein: and a vapor phase outlet of the dehydration tower is connected with a dehydration vapor phase condensation system, the dehydration vapor phase condensation system comprises a dehydration condensation device, a condenser and a tail condenser which are sequentially communicated according to the material flowing direction, and the vacuum pump is connected with the tail condenser.
3. The solvent negative pressure rectification system of claim 2, wherein: the two preheating devices are respectively a first preheating device and a second preheating device;
the first preheating device is an interlayer or a pipeline surrounding a vapor phase container in the dehydration condensation device; or the dehydration condensing device is an interlayer or a pipeline surrounding the material container in the first preheating device;
and a material outlet of the waste liquid storage device is connected with an inlet of the first preheating device, an outlet of the first preheating device is connected with an inlet of the second preheating device, and an outlet of the second preheating device is connected with an inlet of the decoloring tower kettle.
4. The solvent negative pressure rectification system of claim 3, wherein: and a feed liquid pump is arranged between the second preheating device and the decoloring tower kettle.
5. The solvent negative pressure rectification system of claim 2, wherein: the dehydration vapor phase condensation system is also provided with a phase separation tank, and a light phase outlet of the phase separation tank is connected with a reflux inlet of the dehydration tower.
6. The solvent negative pressure rectification system of claim 3, wherein: the device also comprises a reboiling device, wherein the feed end of the reboiling device is connected with the condensed water outlet of the dehydration tower, and the vapor phase outlet of the reboiling device is connected with the vapor phase inlet of the dehydration tower.
7. The solvent negative pressure rectification system of claim 6, wherein: and a condensed water outlet of the reboiling device is connected with an inlet of the second preheating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921729394.9U CN211189160U (en) | 2019-10-15 | 2019-10-15 | Solvent negative pressure rectification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921729394.9U CN211189160U (en) | 2019-10-15 | 2019-10-15 | Solvent negative pressure rectification system |
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| Publication Number | Publication Date |
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| CN211189160U true CN211189160U (en) | 2020-08-07 |
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| CN201921729394.9U Active CN211189160U (en) | 2019-10-15 | 2019-10-15 | Solvent negative pressure rectification system |
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| CN (1) | CN211189160U (en) |
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- 2019-10-15 CN CN201921729394.9U patent/CN211189160U/en active Active
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