CN214808532U - VOC's device among desorption polyether polyol - Google Patents
VOC's device among desorption polyether polyol Download PDFInfo
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- CN214808532U CN214808532U CN202120231921.4U CN202120231921U CN214808532U CN 214808532 U CN214808532 U CN 214808532U CN 202120231921 U CN202120231921 U CN 202120231921U CN 214808532 U CN214808532 U CN 214808532U
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Abstract
The utility model provides a VOC's device among desorption polyether polyol, the device is including the gas-liquid mixer, strip evaporimeter, vapour-liquid separation tower and the steam condenser that connect gradually. The device of the utility model increases the interface contact area of the vapor phase and the liquid phase by directly mixing the vapor and the polyether polyol product containing VOC through the arrangement of the devices of vapor-liquid mixing, steam stripping evaporation, vapor-liquid separation and the like, reduces the difficulty of the steam stripping of the VOC components, and further separates the vapor phase and the liquid phase through the vapor-liquid separation and the nitrogen gas stripping, thereby realizing the high-efficiency removal of the VOC in the polyether polyol product and having high VOC removal rate; the device has the advantages of simple engineering, stable operation, low cost and wide application prospect.
Description
Technical Field
The utility model belongs to the technical field of the polymer preparation, a VOC's device in desorption polyether polyol is related to.
Background
Polyether polyol is one of important raw materials in the polyurethane industry, and is widely applied to various fields in life, such as furniture building materials, automotive interiors, heat-insulating materials and the like. With the increasing standard of living, the VOC problem of polyether polyol or polyurethane materials has become the focus of public attention, for example, with the rapid development of the automobile industry and the increasing awareness of comfort and safety, strict control of the VOC content of the materials used is required.
In the synthesis process of polyether polyol, a considerable part of VOC in the product can not be separated due to various factors such as raw material introduction, side reaction generation, various additives added in post-treatment and the like, so that the product quality is influenced, and harm is possibly caused, therefore, one of important treatment processes is adopted when VOC in polyether polyol is removed. The traditional VOC removal process is that materials are added into a stirring tank generally, VOC is removed through vacuumizing, the effect of primary treatment is difficult to achieve, secondary flash evaporation or tertiary flash evaporation needs to be set, energy consumption is high, equipment vibration is easily caused by a mode of introducing gas into the stirring tank, and the removal process is influenced.
CN 110483759a discloses a preparation method of low VOC polyether polyol, which comprises the following steps: 1) uniformly mixing a small molecular initiator and an initiator to prepare a reaction solution; 2) injecting the reaction liquid, propylene oxide and ethylene oxide into a reaction system for reaction to prepare crude polyether polyol; 3) passing the product of the step 2) through a removing tank, introducing inert gas under a high vacuum state, removing vaporized propylene oxide, ethylene oxide and other small molecular substances, cooling the gas phase by a multistage cooler arranged in a vacuum system, condensing the vaporized propylene oxide and ethylene oxide into liquid, and recovering the liquid to a recovery tank. The method adopts a mode of firstly vacuumizing and then introducing inert gas to remove VOC, but the removal effect of a single-stage removal tank is limited, and the introduction of the inert gas easily causes equipment vibration to influence the operation and the service life of the equipment.
CN 104130389A discloses a method for reducing VOC content of polyether polyol, which comprises the steps of adding peroxide into polyether polyol in a closed reaction kettle through a feed line extending into the bottom of the kettle, mixing at a certain pressure and temperature, and carrying out post-treatment on the mixture to obtain a polyether polyol product with low VOC content. According to the method, the VOC is oxidized by adding the oxidant, so that the difficulty of subsequent vacuum removal is reduced, but the oxidant is additionally added, so that the reaction degree is difficult to control, impurities are easily introduced, and the performance of the polyether polyol product is changed.
To sum up, to the desorption of VOC in the polyether polyol product, still need select suitable device, can realize the abundant desorption of VOC, improve the desorption rate, avoid again to the influence of polyether polyol product quality.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model aims to provide a VOC's device in desorption polyether polyol, the device is through with steam and the polyether polyol product direct mixing of treating desorption VOC, and the steam of being convenient for strips out the VOC component, again through vapour-liquid separation and steam condensation, with each component intensive separation, has realized the effective desorption of VOC in the polyether polyol product.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a VOC's device among desorption polyether polyol, the device is including the gas-liquid mixer, strip evaporimeter, vapour-liquid separation tower and the steam condenser that connect gradually.
The utility model discloses in, to VOC's desorption in the polyether polyol product, set up vapour-liquid mixer and strip evaporimeter earlier, mix steam directly with the product and form stable vapour-liquid two-phase flow, can increase area of contact, improve heat transfer and mass transfer efficiency, be convenient for VOC component strip steam from liquid phase product in, VOC and polyether polyol product separation that rethread vapour-liquid knockout tower will strip out, obtain the polyether polyol product after the purification, and for further processing VOC component, set up steam condenser again and separate it with steam, be convenient for each part material handle respectively or retrieve; the device can high-efficiently get rid of the VOC in the polyether polyol product, and the device simple structure, and the operation is stable, and the cost is lower, has wide application prospect.
Following conduct the utility model discloses preferred technical scheme, nevertheless do not conduct the utility model provides a technical scheme's restriction, through following technical scheme, can reach and realize better the utility model discloses a technical purpose and beneficial effect.
As the preferred technical scheme of the utility model, the import material of vapour-liquid mixer includes steam and the polyether glycol product that contains VOC.
The utility model discloses in, the polyether polyol product is polymer polyol (POP) usually, according to its preparation raw materials and technology, the POP product carries out the flash distillation in advance before desorption VOC, carries out subsequent processing again behind the separation recovery most isopropanol.
As the preferred technical scheme of the utility model, the vapour-liquid mixer includes tubular mixer or static mixer.
The utility model discloses in, through the polyether glycol product that will contain VOC and the direct mixture of steam, compare with the indirect heating material of steam, improved the heat transfer effect and the heat transfer efficiency of steam, make the material reach the processing temperature more easily.
As the preferable technical proposal of the utility model, the stripping evaporator comprises a climbing film heat exchanger.
As the utility model discloses preferred technical scheme, it is fixed tube sheet heat exchanger to rise membrane heat exchanger, the tube side fluid of fixed tube sheet heat exchanger is the export misce bene of vapour-liquid mixer, and the shell side fluid is steam.
The utility model discloses in, the strip evaporimeter selects to rise membrane formula heat exchanger, can utilize the steam that rises at a high speed to drive liquid product material and flow to the membrane along the wall, has increased the contact surface in vapour liquid phase, makes VOC follow liquid strip to steam more easily, and desorption in the liquid is followed more easily, and the steam in the shell side of heat exchanger can constantly provide the heat, maintains going on of strip evaporation process.
As the utility model discloses preferred technical scheme, the vapour-liquid separation tower includes the gas stripping packed tower, the gaseous nitrogen gas that includes of gas stripping packed tower, the packing of gas stripping packed tower includes the regular packing of corrugated metal plate.
In the utility model, the polyether glycol product after stripping needs to be separated from the steam containing VOC, and for the selection of the steam-liquid separation tower, the packed tower can play a better role, simultaneously selects vacuum operation, is beneficial to the further removal of VOC, and uses nitrogen gas for stripping, the steam containing VOC is easier to be removed from the liquid product, and the anti-blocking performance of the metal corrugated plate packing is good, so that the long-time continuous operation of the device can be maintained; in addition, the stripped packed column may also use bulk packing.
As the utility model discloses preferred technical scheme, the upper portion export of vapour-liquid separation tower is connected with steam condenser, the lower part exit linkage of vapour-liquid separation tower has product collection device.
The utility model discloses in, the product that the vapour-liquid separation tower separated adopts the product pump to store in carrying product collection device with it for later use.
As the utility model discloses preferred technical scheme, steam condenser includes fixed tube sheet heat exchanger, fixed tube sheet heat exchanger's tube side fluid is for containing VOC's steam, and the shell side fluid is the circulating water.
As the utility model discloses preferred technical scheme, steam condenser's export still is connected with the lime set collector, the lower part exit linkage of lime set collector has effluent treatment plant.
The utility model discloses in, to the processing that contains VOC's steam, through the steam condenser with steam condensation as far as possible, get into the condensate collector, but wherein also have the condensation of part VOC component, therefore the condensate that obtains need carry out waste water treatment.
As the preferred technical scheme of the utility model, steam condenser's export and condensate collector's upper portion export all are connected with vacuum apparatus.
The utility model discloses in, to remaining VOC part behind the steam condensation, utilize vacuum apparatus's evacuation effect, get into tail gas processing apparatus after collecting it.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the device of the utility model reduces the difficulty of VOC component stripping by utilizing the direct mixing of steam and the VOC-containing polyether polyol product through the arrangement of devices such as steam-liquid mixing, steam stripping evaporation, steam-liquid separation and the like, further strips and separates the steam-liquid two phases through the steam-liquid separation effect, realizes the high-efficiency removal of VOC in the polyether polyol product, and the VOC residual amount can be reduced to below 5ppm so as to meet the requirement of a customer on the polyether product;
(2) device simple structure, the operation is stable, and the cost is lower, has wide application prospect.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for removing VOCs from polyether polyol provided in example 1 of the present invention;
the system comprises a gas-liquid mixer 1, a stripping evaporator 2, a gas-liquid separation tower 3, a steam condenser 4, a condensate collector 5, a product delivery pump 6 and a condensate delivery pump 7.
Detailed Description
To better explain the technical solution of the present invention, it is convenient to understand the technical solution of the present invention, and the following is further detailed description of the present invention, but the following embodiments are only simple examples of the present invention, and do not represent or limit the protection scope of the present invention, and the protection scope of the present invention is subject to the claims.
The utility model discloses embodiment mode part provides a VOC's device among desorption polyether polyol, the device is including the gas-liquid mixer 1, the strip evaporimeter 2, the gas-liquid separation tower 3 and the steam condenser 4 that connect gradually.
The following are typical but non-limiting examples of the present invention:
example 1:
the embodiment provides a device for removing VOC in polyether polyol, the structural schematic diagram of the device is shown in figure 1, and the device comprises a vapor-liquid mixer 1, a stripping evaporator 2, a vapor-liquid separation tower 3 and a vapor condenser 4 which are connected in sequence.
The inlet materials of the gas-liquid mixer 1 comprise steam and VOC-containing polyether polyol products, and the steam pressure is 0.8 MPa.
The gas-liquid mixer 1 is a tubular mixer.
The stripping evaporator 2 is a climbing film heat exchanger, specifically a fixed tube-plate heat exchanger is selected, the tube side fluid of the fixed tube-plate heat exchanger is the outlet mixed material of the gas-liquid mixer 1, and the shell side fluid is steam.
The vapor-liquid separation tower 3 is a gas stripping packed tower, the gas stripping gas of the gas stripping packed tower is nitrogen, and the packing of the gas stripping packed tower is structured packing of metal corrugated plates.
The upper outlet of the vapor-liquid separation tower 3 is connected with a vapor condenser 4, and the lower outlet of the vapor-liquid separation tower 3 is connected with a product collecting device through a product conveying pump 6.
The steam condenser 4 is a fixed tube-plate heat exchanger, the tube side fluid of the fixed tube-plate heat exchanger is VOC-containing steam, and the shell side fluid is circulating water.
The outlet of the steam condenser 4 is also connected with a condensate collector 5, and the lower outlet of the condensate collector 5 is connected with a wastewater treatment device through a condensate delivery pump 7.
And the outlet of the steam condenser 4 and the upper outlet of the condensate collector 5 are connected to a tail gas treatment device through a vacuum device.
Example 2:
the embodiment provides a device for removing VOC in polyether polyol, which comprises a vapor-liquid mixer 1, a stripping evaporator 2, a vapor-liquid separation tower 3 and a vapor condenser 4 which are connected in sequence.
The inlet materials of the gas-liquid mixer 1 comprise steam and VOC-containing polyether polyol products.
The gas-liquid mixer 1 is an SV type static mixer.
The stripping evaporator 2 is a climbing film heat exchanger, specifically a fixed tube-plate heat exchanger is selected, the tube side fluid of the fixed tube-plate heat exchanger is the outlet mixed material of the gas-liquid mixer 1, and the shell side fluid is steam.
The gas-liquid separation tower 3 is a gas stripping packed tower, gas stripping gas of the gas stripping packed tower is nitrogen and steam carried by materials, and packing of the gas stripping packed tower is pall ring bulk packing.
The upper outlet of the vapor-liquid separation tower 3 is connected with a vapor condenser 4, and the lower outlet of the vapor-liquid separation tower 3 is connected with a product collecting device through a product conveying pump 6.
The steam condenser 4 is a fixed tube-plate heat exchanger, the tube side fluid of the fixed tube-plate heat exchanger is VOC-containing steam, and the shell side fluid is circulating water.
The outlet of the steam condenser 4 is also connected with a condensate collector 5, and the lower outlet of the condensate collector 5 is connected with a wastewater treatment device through a condensate delivery pump 7.
And the outlet of the steam condenser 4 and the upper outlet of the condensate collector 5 are connected to a tail gas treatment device through a vacuum device.
The device in the above embodiment is used for removing VOCs from polyether polyol products, and specifically comprises the following operation procedures:
the method comprises the steps of enabling a polyether polyol product containing VOC to enter a gas-liquid mixer 1 after flash evaporation to be mixed with steam to form a gas-liquid two-phase flow, enabling the gas-liquid two-phase flow to enter a steam stripping evaporator 2, enabling the steam rising at a high speed in a heating pipe of the steam stripping evaporator 2 to drive product materials to flow in a film shape along the wall surface, enabling the VOC to be lifted from liquid phase steam to steam, enabling the product coming out of the steam stripping evaporator 2 and the steam containing the VOC to be separated in a steam-liquid separation tower 3 filled with fillers, using nitrogen gas to strip the product to further remove the VOC in the product and separate the steam containing the VOC from the liquid phase product, collecting and storing the obtained polyether polyol product, condensing the steam containing the VOC in a steam condenser 4, separating condensate through a condensate collector 5 and then sending the condensate to a wastewater treatment device, and collecting the VOC gas through a vacuum device and then carrying out tail gas treatment.
It can be seen from the above-mentioned embodiment of synthesis that the device passes through the setting of devices such as vapor-liquid mixture, steam stripping evaporation and vapor-liquid separation, utilizes the steam and the direct mixing that contains VOC polyether polyol product to reduce the degree of difficulty that VOC component strips, and the rethread vapor-liquid separation effect is further stripped and is separated vapour-liquid two-phase, has realized the high-efficient desorption of VOC in the polyether polyol product, and the VOC residual can be reduced to below 5ppm, reaches the requirement of customer to the polyether product; the device has the advantages of simple structure, stable operation, low cost and wide application prospect.
The applicant states that the present invention is described in the above embodiments, but the present invention is not limited to the above detailed device, i.e. the present invention must not be implemented by relying on the above detailed device. It should be clear to those skilled in the art that any improvement of the present invention, to the addition of the equivalent replacement and auxiliary devices of the present invention, the selection of the specific mode, etc., all fall within the scope of protection and disclosure of the present invention.
Claims (6)
1. The device for removing VOC in polyether polyol is characterized by comprising a vapor-liquid mixer, a stripping evaporator, a vapor-liquid separation tower and a vapor condenser which are sequentially connected;
the inlet materials of the vapor-liquid mixer comprise steam and VOC-containing polyether polyol products, and the vapor-liquid mixer comprises a tubular mixer or a static mixer; the vapor-liquid separation tower comprises a stripping packed tower, stripping gas of the stripping packed tower comprises nitrogen, and packing of the stripping packed tower comprises metal corrugated plate structured packing; the steam condenser comprises a fixed tube-plate heat exchanger, the tube side fluid of the fixed tube-plate heat exchanger is VOC-containing steam, and the shell side fluid is circulating water.
2. The apparatus according to claim 1, wherein the stripping evaporator comprises a climbing film heat exchanger.
3. The device for removing VOC in polyether polyol according to claim 2, wherein the rising film heat exchanger is a fixed tube-plate heat exchanger, the tube side fluid of the fixed tube-plate heat exchanger is an outlet mixed material of a gas-liquid mixer, and the shell side fluid is steam.
4. The apparatus according to claim 1, wherein the upper outlet of the vapor-liquid separation column is connected to a vapor condenser, and the lower outlet of the vapor-liquid separation column is connected to a product collection device.
5. The device for removing VOC from polyether polyol according to claim 1, wherein the outlet of the steam condenser is further connected with a condensate collector, and the outlet at the lower part of the condensate collector is connected with a waste water treatment device.
6. The apparatus according to claim 5, wherein a vacuum device is connected to both the outlet of the steam condenser and the upper outlet of the condensate collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120231921.4U CN214808532U (en) | 2021-01-27 | 2021-01-27 | VOC's device among desorption polyether polyol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120231921.4U CN214808532U (en) | 2021-01-27 | 2021-01-27 | VOC's device among desorption polyether polyol |
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| Publication Number | Publication Date |
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| CN214808532U true CN214808532U (en) | 2021-11-23 |
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| CN202120231921.4U Active CN214808532U (en) | 2021-01-27 | 2021-01-27 | VOC's device among desorption polyether polyol |
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- 2021-01-27 CN CN202120231921.4U patent/CN214808532U/en active Active
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