CN213739045U - Comprehensive utilization device for wastes in PVB resin production process - Google Patents
Comprehensive utilization device for wastes in PVB resin production process Download PDFInfo
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- CN213739045U CN213739045U CN202022768694.7U CN202022768694U CN213739045U CN 213739045 U CN213739045 U CN 213739045U CN 202022768694 U CN202022768694 U CN 202022768694U CN 213739045 U CN213739045 U CN 213739045U
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Abstract
The utility model discloses a comprehensive utilization device of discarded object in PVB resin production process, its process route is: after the pH of the waste is regulated step by step through a waste collection tank, a feeding tank and an alkali liquor tank, the waste is heated through a feeding preheater and then conveyed to a butyraldehyde removal tower for treatment; gas evaporated from the butyraldehyde removal tower is treated by a condenser and a phase separator to obtain oil phase butyraldehyde and water phase waste, and the water phase waste returns to the butyraldehyde removal tower for continuous treatment; and (3) exchanging heat of the kettle liquid of the butyraldehyde removal tower through a feeding preheater, and then treating the kettle liquid in a concentration device, an evaporation device and a crystallization device to obtain sodium chloride solid. The utility model discloses a device can realize that the whole retrieval and utilization of water resource and the whole regeneration of industrial waste, accords with green development and high quality development needs.
Description
Technical Field
The utility model belongs to the utilization of waste field, concretely relates to comprehensive utilization device of discarded object in PVB resin production process.
Background
Polyvinyl butyral (PVB) resin has the advantages of good transparency, cold resistance, water resistance, film forming property, impact resistance and the like, and has wide application fields, and the main scale application fields comprise manufacturing of safety glass, coating, printing ink, adhesive, ceramic applique, papermaking, photovoltaic cell film pasting and the like. With the progress of the technology, the application field of the PVB for the film is continuously widened, and the shadow of the PVB for the film can be seen everywhere from the top to aerospace and down to daily necessities of common people. The PVB finished product is prepared by a process route of condensing polyvinyl alcohol and n-butyl aldehyde in industry through the steps of dissolving, condensing, washing with water, drying and the like.
The waste in the PVB production process mainly comes from the PVB washing step, and PVB generated after condensation reaction contains materials such as butyraldehyde, hydrochloric acid and the like, and the existence of the materials seriously affects the quality of the PVB and needs to be washed away by pure water. Waste formed after PVB washing is generally directly discharged into a sewage treatment system, so that the environmental protection pressure is increased, and the sewage treatment cost is increased.
Patent CN201721243071.X introduces a butyraldehyde gas stripping recovery system for PVB wastewater, the system extracts redundant butyraldehyde by introducing steam into a precipitate in the condensation reaction process, the extracted raw material is mixed with the residual PVA raw material and hydrochloric acid for reaction again, PVB generated by the reaction is sent into a water washing area, and water washing water and alkali are neutralized and then enter a film making area by a steam generator for reutilization. However, the process requirements for the stripping operation during the reaction can have an impact on the PVB condensation process and thus product quality.
SUMMERY OF THE UTILITY MODEL
Based on the problem that above-mentioned prior art exists, the utility model provides a comprehensive utilization device of discarded object in PVB resin production process aims at realizing the complete utilization of discarded object and the zero release of waste water to alleviate sewage treatment plant operation load.
For solving the technical problem, the utility model discloses take following technical scheme:
the utility model provides a comprehensive utilization device of discarded object in PVB resin production process which characterized in that: comprises a waste collection tank, a feeding tank, an alkali liquor tank, a feeding preheater, a butyraldehyde removal tower, a condenser, a phase separator, a reflux tank, a butyraldehyde storage tank, a kettle liquid collection tank, a concentration device, an evaporation device and a crystallization device;
a material outlet of the waste collection tank is communicated to a material inlet of the feeding tank; a material outlet of the feeding tank is communicated to a first material inlet of the feeding preheater; a material outlet of the alkali liquor tank is communicated to a material inlet of the feeding tank and a first material inlet of the feeding preheater in parallel;
a first material outlet of the feeding preheater is communicated to a first material inlet of the debutanizer; a discharge hole in the top of the butyraldehyde removal tower is communicated to a material inlet of the condenser; a material outlet of the condenser is communicated to a material inlet of the phase separator; a water phase outlet of the phase separator is communicated with a material inlet of the reflux tank, and an oil phase outlet of the phase separator is communicated with the butyraldehyde storage tank;
a material outlet of the reflux tank is communicated to a second material inlet of the debutanizer;
a kettle liquid outlet at the bottom of the debutanizer is communicated to a second material inlet of the feeding preheater, and a second material outlet of the feeding preheater is communicated to a material inlet of the kettle liquid collecting tank; a material outlet of the kettle liquid collecting tank is communicated to a material inlet of the concentration device; a material outlet of the concentration device is communicated to a material inlet of the evaporation device; and a material outlet of the evaporation device is communicated to a material inlet of the crystallization device.
Further, the concentration device is a reverse osmosis membrane system.
Further, the evaporation plant is a multi-effect flash evaporation device.
Further, a steam inlet is formed in the middle lower part of the debutanizing tower.
The beneficial effects of the utility model are embodied in:
1. utilize the utility model discloses a device handles the back to the discarded object in the PVB resin production process, and the gained end product includes: sodium chloride solid is recycled as chemical raw material; the steam is recycled as a heating medium for chemical production; butyraldehyde is recycled as a production raw material. Therefore, the utility model discloses a device has realized the whole recycle of water resource and the whole regeneration of industrial waste product, accords with green development and high quality development needs.
2. The utility model discloses an in the device, utilize the cauldron liquid of taking off the butyraldehyde tower to heat the discarded object through the heat transfer, the steam volume of consumption when having saved the discarded object heating.
3. The utility model discloses an in the device, discarded object pH adjusts the mode that adopts the secondary to add alkali, can effectively control the pH value of discarded object according to the flow of discarded object, makes it reach the processing requirement, avoids the corruption to equipment.
4. Utilize the device of the utility model, with butyraldehyde by the discarded object that has harm to the environment, handle and become raw materials for production, not only economic benefits is showing, has also played the guard action to the environment.
5. Utilize the utility model discloses a device takes off the concentrated back crystallization of cauldron liquid of butyraldehyde tower, the effective retrieval and utilization of comdenstion water, the water economy resource, the sodium chloride product that forms simultaneously can be used as the industrial salt.
6. The utility model discloses an in the device, adopt the combination of membrane filtration and multiple-effect flash distillation technique, effectively reduce evaporation steam consumption.
Drawings
Fig. 1 is a schematic diagram of the comprehensive utilization device for waste in the production process of PVB resin, and the reference numbers in the diagram are: the method comprises the following steps of 1-a waste collection tank, 2-a feeding tank, 3-a lye tank, 4-a feeding preheater, 5-a butyraldehyde removal tower, 6-a condenser, 7-a phase separator, 8-a reflux tank, 9-a butyraldehyde storage tank, 10-a kettle liquid collection tank, 11-a concentration device, 12-an evaporation device and 13-a crystallization device.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. The following is merely exemplary and illustrative of the inventive concept and various modifications, additions and substitutions which may be made by those skilled in the art to the described embodiments without departing from the inventive concept or exceeding the scope of the invention as defined in the claims are intended to fall within the scope of the invention.
Example 1
Referring to fig. 1, the apparatus for comprehensive utilization of waste in the PVB resin production process of the present embodiment includes a waste collection tank 1, a feed tank 2, an alkali liquor tank 3, a feed preheater 4, a debutanization column 5, a condenser 6, a phase separator 7, a reflux tank 8, a butyraldehyde storage tank 9, a kettle liquid collection tank 10, a concentration apparatus 11, an evaporation apparatus 12, and a crystallization apparatus 13.
A material outlet of the waste collection tank 1 is communicated to a material inlet of the feeding tank 2; a material outlet of the feeding tank 2 is communicated to a first material inlet of the feeding preheater 4; the material outlet of the lye tank 3 is communicated to the material inlet of the feeding tank 2 and the first material inlet of the feeding preheater 4 in parallel.
A first material outlet of the feeding preheater 4 is communicated to a first material inlet of the debutanization aldehyde tower 5; a discharge hole at the top of the butyraldehyde removal tower 5 is communicated to a material inlet of a condenser 6; a material outlet of the condenser 6 is communicated to a material inlet of the phase separator 7; the water phase outlet of the phase separator 7 is communicated with the material inlet of the reflux tank 8, and the oil phase outlet is communicated with the butyraldehyde storage tank 9.
The material outlet of the reflux tank 8 is communicated to the second material inlet of the debutanizer 5.
A kettle liquid outlet at the bottom of the butyraldehyde removal tower 5 is communicated to a second material inlet of the feeding preheater 4, and a second material outlet of the feeding preheater 4 is communicated to a material inlet of the kettle liquid collecting tank 10; a material outlet of the kettle liquid collecting tank 10 is communicated to a material inlet of the concentration device 11; a material outlet of the concentration device 11 is communicated to a material inlet of the evaporation device 12; a material outlet of the evaporation device 12 is communicated to a material inlet of the crystallization device 13.
Further, the concentration device 11 is a reverse osmosis membrane system, and the evaporation device 12 is a multi-effect flash evaporation device.
Further, the middle lower part of the debutanizer 5 is provided with a steam inlet for introducing steam (such as low-pressure steam and water vapor) into the tower to directly heat the waste. In specific implementation, a gas distributor can be arranged in the debutanizer to regulate the uniform distribution of steam in the tower. The direct heating mode has higher efficiency, and is not easy to scale and corrode compared with the traditional reboiler structure.
The method for comprehensively utilizing the wastes in the PVB resin production process by utilizing the device comprises the following steps:
waste formed after washing the PVB is firstly collected into a waste collection tank 1 and then is conveyed into a feeding tank 2, and alkali liquor conveyed by an alkali liquor tank 3 is added into a pipeline before entering the feeding tank 2, so that the waste entering the feeding tank 2 is weakly acidic (pH is approximately equal to 6); the waste in the feeding tank 2 is conveyed to a feeding preheater 4, and the alkali liquor conveyed by the alkali liquor tank 3 is added into a pipeline before entering the feeding preheater 4, so that the waste entering the feeding preheater 4 is neutral.
The waste in the feed preheater 4 is conveyed to a butyraldehyde removal tower 5 after heat exchange; introducing steam into the butyraldehyde removal tower 5 to directly heat the waste; butyraldehyde and water in the waste are evaporated from the top of the tower, condensed by a condenser 6 and then enter a phase separator 7 for phase separation (a water phase is at the lower layer of the phase separator, and an oil phase is at the upper layer of the phase separator); the water phase (mainly comprising water, sodium chloride and a small amount of butyraldehyde) flows back to the reflux tank 8, and the oil phase (mainly comprising butyraldehyde and a small amount of water, wherein the butyraldehyde content is 90-100 wt%) enters a butyraldehyde storage tank 9 as recovered butyraldehyde.
The water phase in the reflux tank 8 is conveyed to a debutanization tower 5 to continue the debutanization.
Conveying the kettle liquid (mainly comprising water and sodium chloride) of the debutanizer 5 to the feeding preheater 4, exchanging heat with the waste from the feeding tank 2, and flowing into a kettle liquid collecting tank 10; and concentrating the kettle liquid in the kettle liquid collecting tank 10 by a concentrating device 11, then sending the concentrated kettle liquid into an evaporating device 12, reusing water vapor generated by evaporation by a steam compressing device, and conveying the residual materials to a crystallizing device 13 for crystallization to obtain sodium chloride solid.
In this example, the waste containing water, butyraldehyde, hydrochloric acid and sodium chloride as main components (where the butyraldehyde content is approximately equal to 0.12 wt%, the hydrochloric acid content is approximately equal to 0.038mol/L, and the sodium chloride content is approximately equal to 0.15mol/L) is treated by the above method, where:
the alkali liquor is sodium hydroxide solution with mass concentration of 14.6%.
The temperature of the waste collected into the waste collection tank 1 is approximately equal to 45.3 ℃, the temperature of the waste heated by the feeding preheater 4 is approximately equal to 99 ℃, and the waste is heated by the feeding preheater 4 and then enters the butyraldehyde removal tower 5. The temperature of the kettle liquid of the debutanizer 5 is approximately equal to 100.2 ℃, and the temperature after heat exchange by the feed preheater 4 is approximately equal to 51.2 ℃.
The temperature of the gas evaporated by the butyraldehyde removal tower 5 is approximately equal to 99.6 ℃, and the temperature after condensation by a condenser is approximately equal to 35.3 ℃; the temperature of the aqueous phase in reflux drum 8 ≈ 31.4 ℃.
After treatment according to the process, the embodiment realizes the complete reuse of water resources and the complete regeneration of industrial wastes, and the obtained final product comprises: sodium chloride solid is recycled as chemical raw material; the steam is recycled as a heating medium for chemical production; butyraldehyde is recycled as a production raw material.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalent alterations and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The utility model provides a comprehensive utilization device of discarded object in PVB resin production process which characterized in that: comprises a waste collection tank (1), a feeding tank (2), an alkali liquor tank (3), a feeding preheater (4), a debutanization tower (5), a condenser (6), a phase separator (7), a reflux tank (8), a butyraldehyde storage tank (9), a kettle liquid collection tank (10), a concentration device (11), an evaporation device (12) and a crystallization device (13);
a material outlet of the waste collection tank (1) is communicated to a material inlet of the feeding tank (2); a material outlet of the feeding tank (2) is communicated to a first material inlet of the feeding preheater (4); a material outlet of the lye tank (3) is communicated with a material inlet of the feeding tank (2) and a material first inlet of the feeding preheater (4) in parallel;
a first material outlet of the feeding preheater (4) is communicated to a first material inlet of the debutanizer (5); a discharge hole at the top of the butyraldehyde removal tower (5) is communicated to a material inlet of the condenser (6); a material outlet of the condenser (6) is communicated to a material inlet of the phase separator (7); a water phase outlet of the phase separator (7) is communicated with a material inlet of the reflux tank (8), and an oil phase outlet is communicated with the butyraldehyde storage tank (9);
a material outlet of the reflux tank (8) is communicated to a second material inlet of the debutanizer (5);
a kettle liquid outlet at the bottom of the debutanizer (5) is communicated to a second material inlet of the feeding preheater (4), and a second material outlet of the feeding preheater (4) is communicated to a material inlet of the kettle liquid collecting tank (10); a material outlet of the kettle liquid collecting tank (10) is communicated to a material inlet of the concentrating device (11); a material outlet of the concentration device (11) is communicated to a material inlet of the evaporation device (12); a material outlet of the evaporation device (12) is communicated to a material inlet of the crystallization device (13).
2. The integrated utilization device according to claim 1, wherein: the concentration device (11) is a reverse osmosis membrane system.
3. The integrated utilization device according to claim 1, wherein: the evaporation device (12) is a multi-effect flash evaporation device.
4. The integrated utilization device according to claim 1, wherein: and a steam inlet is formed in the middle lower part of the butyraldehyde removal tower (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022768694.7U CN213739045U (en) | 2020-11-25 | 2020-11-25 | Comprehensive utilization device for wastes in PVB resin production process |
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| CN202022768694.7U CN213739045U (en) | 2020-11-25 | 2020-11-25 | Comprehensive utilization device for wastes in PVB resin production process |
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| CN213739045U true CN213739045U (en) | 2021-07-20 |
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