Device for recovering pinacol from pinacol wastewater

Abstract

The utility model discloses a device for recovering pinacol from pinacol wastewater, which comprises a raw water collecting tank, an ultrafiltration device, an ultrafiltration water collecting tank, a reverse osmosis device and a concentrated water collecting tank, and inlets of the raw water collecting tank, the ultrafiltration device, a cooler, the ultrafiltration water collecting tank and the reverse osmosis device are sequentially connected; a first outlet of the reverse osmosis device is connected with the concentrated water collecting box, a second outlet of the reverse osmosis device is connected with the wastewater collecting box, and the wastewater collecting box is connected with the biochemical treatment device after passing through the heating device. According to the utility model, the cooler is arranged between the ultrafiltration device and the ultrafiltration water collecting box, and the solubility of pinacol can be reduced by cooling the wastewater through the cooler, so that reverse osmosis separation is facilitated, effective separation of pinacol and water is realized, and most pinacol in the wastewater is recovered.

Description

Technical Field

[0001] The utility model relates to the field of wastewater recovery, in particular to a device for recovering pinacol from pinacol wastewater. Background Art

[0002] Pinacol is a new key pharmaceutical intermediate widely used in the development of therapeutics for cardiovascular and cerebrovascular diseases, cancer, and other diseases. The production method for pinacol involves using tetramethylethylene and hydrogen peroxide as the main raw materials, reacting them in the presence of a catalyst to produce hydrous pinacol. This hydrous pinacol is then dehydrated by vacuum distillation to obtain pinacol.

[0003] During the vacuum distillation dehydration process, pinacol condensate is generated. The condensate contains 2% pinacol. Due to the high pinacol content, it cannot be directly biochemically treated. The condensate needs to be Fenton treated. The treatment process is as follows: the condensate is collected and sent to the collection pool, and then pumped into the Fenton reaction tank. The Fenton reaction tank uses Fe 2+ As an H2O2 catalyst, pinacol is degraded into multiple small organic molecules, achieving the goal of removing organic matter from the wastewater. After the Fenton reaction is completed, NaOH, PAC, and PAM are added for coagulation and sedimentation. After sedimentation, the entire amount enters a plate and frame filter press for solid-liquid separation. The liquid flows into an intermediate water tank and is pumped into subsequent biochemical equipment for biochemical reactions. The sludge passes through the plate and frame filter press, is dried, and then transported for disposal.

[0004] The following problems exist in the existing Fenton treatment process of condensate:

[0005] 1. The pinacol content in the pinacol wastewater is high and cannot be directly treated biochemically. It first needs to flow into the Fenton reaction tank for Fenton reagent oxidation treatment.

[0006] 2. Fenton reactor uses Fe 2+ As H2O2 catalyst for oxidation treatment, after the Fenton reaction is completed, NaOH, PAC, and PAM are continuously added in the Fenton reaction equipment for coagulation and sedimentation, which results in high treatment costs.

[0007] 3. Add Fe to Fenton reaction tank 2+ and H2O2, and continuing to add NaOH, PAC, and PAM will re-introduce pollution factors and produce a large amount of solid waste. Summary of the Invention

[0008] In order to solve the above technical problems, the utility model provides a device for recovering pinacol from pinacol wastewater with simple structure and low cost.

[0009] The utility model solves the above technical problems through a technical solution: a device for recovering pinacol from pinacol wastewater, comprising a raw water collection box, an ultrafiltration device, an ultrafiltration water collection box, a reverse osmosis device, and a concentrated water collection box, wherein the raw water collection box, the ultrafiltration device, the cooler, the ultrafiltration water collection box, and the inlets of the reverse osmosis device are connected in sequence, a first outlet of the reverse osmosis device is connected to the concentrated water collection box, a second outlet of the reverse osmosis device is connected to the wastewater collection box, and the wastewater collection box is connected to the biochemical treatment device after passing through a heating device.

[0010] The device for recovering pinacol from the above-mentioned pinacol wastewater comprises a plurality of reverse osmosis devices connected in series, each reverse osmosis device comprising a shell, a partition, and a fixed bed with a reverse osmosis membrane. The reverse osmosis device is provided with a partition, which separates the space in the shell into a C-shaped flow channel. The shell is provided with a water inlet and a first water outlet at both ends of the flow channel, and a second water outlet is provided at the middle of the flow channel. The second water outlet is separated from the flow channel by a fixed bed with a reverse osmosis membrane. The reverse osmosis device at the front end has its water inlet as a reverse osmosis device. The inlet of the reverse osmosis device is connected to the ultrafiltration water collection tank, and its first water outlet is connected to the water inlet of the next reverse osmosis device; the reverse osmosis device in the middle position has its water inlet connected to the first water outlet of the previous reverse osmosis device, and its first water outlet is connected to the water inlet of the next reverse osmosis device; the reverse osmosis device at the rear end has its water inlet connected to the first water outlet of the previous reverse osmosis device, and its first water outlet serves as the first outlet of the reverse osmosis device and is connected to the concentrated water collection tank; the second water outlets of all reverse osmosis devices are connected together as the second outlet of the reverse osmosis device.

[0011] The device for recovering pinacol from pinacol wastewater comprises an ultrafiltration device comprising a shell in which an ultrafiltration membrane is arranged.

[0012] In the device for recovering pinacol from pinacol wastewater, a water inlet pump is provided between the raw water collection tank and the ultrafiltration device.

[0013] In the device for recovering pinacol from pinacol wastewater, a first high-pressure pump is provided between the ultrafiltration water collection tank and the reverse osmosis device.

[0014] In the device for recovering pinacol from pinacol wastewater, a second high-pressure pump is provided between the wastewater collecting tank and the heating device.

[0015] The device for recovering pinacol from the above-mentioned pinacol wastewater has a wastewater collection tank connected to the second outlet of the reverse osmosis device through a pipeline after passing through the heating device, so as to backwash the reverse osmosis device.

[0016] The beneficial effects of the present invention are:

[0017] 1. The solubility of pinacol in water is temperature-sensitive. Pinacol has a lower solubility at lower temperatures. Based on this characteristic, the utility model provides a cooler between the ultrafiltration device and the ultrafiltration water collection tank. The cooler is used to cool the wastewater, thereby reducing the solubility of pinacol, thereby facilitating reverse osmosis separation, achieving effective separation of pinacol and water, and recovering most of the pinacol in the wastewater.

[0018] 2. The utility model directly carries out biochemical treatment, and does not need to flow into the Fenton reaction tank for Fenton reagent oxidation, coagulation sedimentation and filter press treatment, which reduces operating costs and labor intensity of workers; and shortens the wastewater treatment process, can prevent the re-introduction of pollution factors and the generation of large amounts of solid waste, and reduce the discharge of pollutants. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the present utility model.

[0020] Figure 2 Schematic diagram of the structure of the reverse osmosis device.

[0021] Figure 3 Schematic diagram of the structure of the ultrafiltration device. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 As shown, a device for recovering pinacol from pinacol wastewater includes a raw water collection tank 1, an ultrafiltration device 2, an ultrafiltration water collection tank 3, a reverse osmosis device 4, and a concentrated water collection tank 5. The inlets of the raw water collection tank 1, the ultrafiltration device 2, the cooler 6, the ultrafiltration water collection tank 3, and the reverse osmosis device 4 are connected in sequence. A water inlet pump 7 is provided between the raw water collection tank 1 and the ultrafiltration device 2, and a first high-pressure pump 8 is provided between the ultrafiltration water collection tank 3 and the reverse osmosis device 4; a first outlet of the reverse osmosis device 4 is connected to the concentrated water collection tank 5, and a second outlet of the reverse osmosis device 4 is connected to a wastewater collection tank 9. The wastewater collection tank 9 is connected to a biochemical treatment device after passing through a heating device 10, and a second high-pressure pump 11 is provided between the wastewater collection tank 9 and the heating device 10.

[0024] like Figure 2As shown, the reverse osmosis device 4 is composed of a plurality of reverse osmosis devices connected in series, each of which includes a shell 12, a partition 13, and a fixed bed 14 with a reverse osmosis membrane. The shell 12 is provided with a partition 13, which separates the space in the shell 12 into a C-shaped flow channel 18. The shell 12 is provided with a water inlet 15 and a first water outlet 16 at both ends of the flow channel 18, and a second water outlet 17 is provided at the middle of the flow channel 18 on the shell. The second water outlet 17 is separated from the flow channel 18 by the fixed bed 14 with a reverse osmosis membrane; the reverse osmosis device at the front end has its water inlet 15 as a reverse osmosis device. The inlet of the reverse osmosis device 4 is connected to the ultrafiltration water collection tank 3, and its first water outlet 16 is connected to the water inlet 15 of the next reverse osmosis device; the reverse osmosis device in the middle position has its water inlet 15 connected to the first water outlet 16 of the previous reverse osmosis device, and its first water outlet 16 is connected to the water inlet 15 of the next reverse osmosis device; the reverse osmosis device at the rear end has its water inlet 15 connected to the first water outlet 16 of the previous reverse osmosis device, and its first water outlet 16 is connected to the concentrated water collection tank 5 as the first outlet of the reverse osmosis device 4; the second water outlets 17 of all reverse osmosis devices are connected together as the second outlet of the reverse osmosis device 4.

[0025] like Figure 3 As shown, the ultrafiltration device 2 includes a housing 20 , in which an ultrafiltration membrane 19 is disposed.

[0026] The wastewater collection tank 9 is also connected to the second outlet of the reverse osmosis device 4 through a pipeline after passing through the heating device 10, so as to backwash the reverse osmosis device 4. When the reverse osmosis membrane 14 of the reverse osmosis device 4 needs to be flushed, as shown in FIG. Figure 1 As shown, valves T1, T2, T3, T4, T5, T6, and T7 are opened, and valves T8, T9, and T10 are closed. The wastewater in the wastewater collection tank 9 enters each reverse osmosis device from the second outlet of the reverse osmosis device 4 under the action of the second high-pressure pump 11, flushes the reverse osmosis membrane 14 in the reverse osmosis device, and the flushed wastewater enters the concentrated water collection tank 5.

[0027] The working principle of the utility model is as follows: the pinakonol wastewater is firstly collected into the raw water collecting box 1, when the liquid level in the raw water collecting box 1 reaches the starting liquid level, the water inlet pump 7 is started, and the pinakonol wastewater is sent into the ultrafiltration device 2 for filtration; through the filtration of the ultrafiltration device 2, the suspended matter, macromolecular substance and colloid etc. are intercepted, thereby the ultrafiltration water generated can flow to the ultrafiltration water collecting box 3 after passing through the cooler 6. The principle of the cooler 6 is as follows: according to the temperature sensitivity of the solubility of pinakonol in water, the solubility of pinakonol is smaller when the temperature is lower, the cooling treatment of the pinakonol wastewater through the cooler 6 can reduce the solubility of pinakonol, thereby the reverse osmosis separation is facilitated, and the effective separation of pinakonol and water is realized. The pinakonol wastewater is then pressurized by the first high-pressure pump 8 and sent to the reverse osmosis device 4. The reverse osmosis is a process for separating the relatively pure water (or other solvent) from the solution with lower purity by using the reverse osmosis membrane 14 under pressure. When the pinakonol wastewater is separated by the reverse osmosis membrane 14, due to the osmotic pressure, the water will pass through the reverse osmosis membrane 14 to the side with higher concentration to achieve the separation. The water produced by the reverse osmosis is divided into two parts, namely the water produced by passing through the reverse osmosis membrane 14 and the concentrated water not passing through the reverse osmosis membrane 14. Most of the pinakonol is intercepted in the concentrated water, the concentrated water returns to the production process, and the resource utilization of pinakonol raw material and part of water is realized. The water produced by passing through the reverse osmosis membrane 14 is sent into the wastewater collecting box 9, and then is sent to the biochemical treatment device for further treatment after being heated.

Claims

1. A device for recovering pinacol from pinacol wastewater, characterized in that: It includes a raw water collection box, an ultrafiltration device, an ultrafiltration water collection box, a reverse osmosis device, and a concentrated water collection box. The raw water collection box, the ultrafiltration device, the cooler, the ultrafiltration water collection box, and the inlet of the reverse osmosis device are connected in sequence. The first outlet of the reverse osmosis device is connected to the concentrated water collection box, and the second outlet of the reverse osmosis device is connected to the wastewater collection box. The wastewater collection box is connected to the biochemical treatment device after passing through the heating device.

2. The device for recovering pinacol from pinacol wastewater according to claim 1, wherein: The reverse osmosis device is composed of a plurality of reverse osmosis devices connected in series, each of which includes a shell, a partition, and a fixed bed with a reverse osmosis membrane. The shell is provided with a partition that divides the space inside the shell to form a C-shaped flow channel. The shell is provided with a water inlet and a first water outlet at both ends of the flow channel, and the shell is provided with a second water outlet at the middle of the flow channel. The second water outlet is separated from the flow channel by the fixed bed with a reverse osmosis membrane. The reverse osmosis device at the front end has a water inlet connected to an ultrafiltration water collection tank as the inlet of the reverse osmosis device, and its first water outlet is connected to the water inlet of the next reverse osmosis device. The reverse osmosis device at the middle position has a water inlet connected to the first water outlet of the previous reverse osmosis device, and its first water outlet is connected to the water inlet of the next reverse osmosis device. The reverse osmosis device at the rear end has a water inlet connected to the first water outlet of the previous reverse osmosis device, and its first water outlet is connected to the water inlet of the next reverse osmosis device. The reverse osmosis device at the rear end has a water inlet connected to the first water outlet of the previous reverse osmosis device, and its first water outlet is connected to the concentrated water collection tank as the first outlet of the reverse osmosis device. The second water outlets of all reverse osmosis devices are connected together to form the second outlet of the reverse osmosis device.

3. The device for recovering pinacol from pinacol wastewater according to claim 1, wherein: The ultrafiltration device comprises a shell, in which an ultrafiltration membrane is arranged.

4. The device for recovering pinacol from pinacol wastewater according to claim 1, wherein: A water inlet pump is provided between the raw water collecting box and the ultrafiltration device.

5. The device for recovering pinacol from pinacol wastewater according to claim 1, wherein: A first high-pressure pump is provided between the ultrafiltration water collection box and the reverse osmosis device.

6. The device for recovering pinacol from pinacol wastewater according to claim 1, wherein: A second high-pressure pump is provided between the wastewater collecting tank and the heating device.

7. The device for recovering pinacol from pinacol wastewater according to claim 1, wherein: The wastewater collection tank is also connected to the second outlet of the reverse osmosis device through a pipeline after passing through the heating device, so as to backwash the reverse osmosis device.

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