Reextraction process of hymexazol in hymexazol wastewater treatment

Abstract

The invention discloses a hymexazol re-extraction process in hymexazol wastewater treatment, and relates to the technical field of hymexazol extraction. The method comprises the following steps: preparing 1000L of hymexazol wastewater and more than 250L of chloroform; starting an extraction pump, adjusting a hymexazol wastewater feeding valve to enable the flow of a flow meter to be indicated as 1000L / h, adjusting a chloroform feeding valve to enable the flow of the flow meter to be indicated as 200L / h, simultaneously introducing hymexazol wastewater and chloroform into a static mixer for extraction, and after the extraction is completed, enabling extract liquor to enter a liquid separator; standing the extract liquor in a liquid separator for one hour, separating most chloroform extract liquor at the lower layer in the liquid separator into a desolventizing tank through a material guide valve and a pipeline, discharging a water layer containing a small amount of chloroform at the upper layer in the liquid separator into a wastewater discharge tank, and continuing settling separation; extracting and separating liquid for five batches, and performing chloroform recovery operation once when the extracting liquid reaches 1000L or above, and the like. According to the process disclosed by the invention, hymexazol in the wastewater can be extracted to the greatest extent, and the utilization efficiency of hymexazol is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydroxyzanthate extraction, and in particular to a hydroxyzanthate re-extraction process in hydroxyzanthate wastewater treatment. Background Art

[0002] Hymexazol, also known as Tujunxiao, Kemilin, etc., has a chemical name of 3-hydroxy-5-methylisoxazole. It is not only a systemic fungicide, but also a soil disinfectant. It has a good preventive effect on damping-off caused by Fusarium and Fusarium. Hymexazol can be used to prevent and control diseases caused by Fusarium, Aphanomyces, Pythium and Cortices in rice seedlings, beets, seedlings and other land, and can also be used for the prevention and control of diseases of rice, cucumbers, beets and ornamental plants. Therefore, it has attracted widespread attention. Hymexazol is usually prepared by the aqueous phase method during production;

[0003] Since the wastewater still contains a small amount of oxadazole in the current aqueous phase extraction process, the product is not extracted directly and the wastewater is treated, but this causes a waste of oxadazole products. Therefore, it is very necessary to recover oxadazole efficiently and quickly.

[0004] Therefore, we proposed a re-extraction process of oxadipazole in oxadipazole wastewater treatment. Summary of the invention

[0005] The object of the present invention is to provide a re-extraction process of oxalic acid in oxalic acid wastewater treatment, and to extract oxalic acid in wastewater produced by aqueous phase extraction of oxalic acid through a static mixer and other equipment to solve the problems raised in the background technology.

[0006] The present invention is achieved through the following technical solutions:

[0007] The present invention provides a re-extraction process of oxalic acid in oxalic acid wastewater treatment, comprising the following steps:

[0008] S1: Prepare 1000L of hydroxyzine wastewater and more than 250L of chloroform;

[0009] S2: Start the extraction pump, adjust the feed valve of the oxazolidinone wastewater so that the flow meter indicates 1000 L / h, adjust the feed valve of the chloroform so that the flow meter indicates 200 L / h, and introduce the oxazolidinone wastewater and chloroform into the static mixer for extraction at the same time. After the extraction is completed, the extract enters the liquid separator;

[0010] S3: After the extract is left to stand in the liquid separator for one hour, most of the chloroform extract in the lower layer of the liquid separator is separated into the desolventizing tank through the feed valve and pipeline, and the water layer containing a small amount of chloroform in the upper layer of the liquid separator is discharged into the wastewater discharge tank to continue sedimentation separation;

[0011] S4: Perform liquid-liquid extraction and separation in five batches. When the volume of the extractant reaches more than 1000 L, conduct a chloroform recovery operation once.

[0012] S5: Conduct the chloroform recovery operation under normal pressure. Open a small amount of steam to heat up the extractant in the stripping tank for chloroform recovery. When the liquid temperature reaches 70 °C, the chloroform is recovered into the chloroform storage tank through a cooler. When the liquid temperature reaches 90 °C, the chloroform is completely removed, and then hymexazol is discharged into the crystallization kettle. The melting point of hymexazol is 80 °C - 86 °C.

[0013] S6: Based on the above S5, the remaining concentrated hymexazol solution is discharged for crystallization to recover hymexazol.

[0014] Preferably, in S3, the upper water layer containing a small amount of chloroform in the liquid separator is discharged into the wastewater discharge tank, and continuous sedimentation separation is carried out. The generated wastewater is discharged by overflow, and the deposited lower-layer chloroform is recovered.

[0015] Preferably, the chloroform recovered in S5 is recycled.

[0016] The present invention has the following beneficial effects:

[0017] In the re-extraction process of hymexazol in the treatment of hymexazol wastewater of the present invention, hymexazol in the wastewater can be extracted to the greatest extent, improving the utilization efficiency of hymexazol and being more environmentally friendly.

[0018] In the re-extraction process of hymexazol in the treatment of hymexazol wastewater of the present invention, chloroform can be recycled during the extraction operation, thus reducing the waste of chloroform.

[0019] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a process method diagram for the re-extraction of hymexazol in the treatment of hymexazol wastewater of the present invention;

[0022] Figure 2 It is a process flow diagram for the re-extraction of hymexazol in the treatment of hymexazol wastewater of the present invention.

[0023] In the figure: 1. Waste water metering tank; 2. Chloroform metering tank; 3. First rotameter; 4. Second rotameter; 5. Chlorinated plastic alloy extraction pump; 6. Static mixer; 7. Liquid separator; 8. Waste water discharge tank; 9. Desolventizing tank; 10. Primary condenser; 11. Secondary condenser; 12. Chloroform storage tank. Specific implementation method

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0025] Please refer to Figure 1 As shown, the present invention is a process for re-extracting hymexazol in the treatment of hymexazol wastewater, including the following steps:

[0026] Step 1: Prepare 1000 L of hymexazol wastewater and have more than 250 L of chloroform ready.

[0027] Step 2: Start the chlorinated plastic alloy extraction pump 5, adjust the hymexazol wastewater feed valve so that the flow indication of the second rotameter 4 is 1000 L / h, and adjust the chloroform feed valve so that the indication of the first rotameter 3 is 200 L / h. Simultaneously introduce the hymexazol wastewater and chloroform into the static mixer 6 for extraction. After the extraction is completed, the extract enters the liquid separator 7.

[0028] Step 3: After the extract stands in the liquid separator 7 for one hour, most of the lower-layer chloroform extract in the liquid separator 7 is separated through the guide valve and pipeline to the desolventizing tank 9. The upper-layer water layer containing a small amount of chloroform in the liquid separator 7 is discharged into the waste water discharge tank 8, and continuous sedimentation separation is carried out. The generated waste water is discharged by overflow, and the deposited lower-layer chloroform is recovered.

[0029] Step 4: Perform extraction and liquid separation in five batches. When the extract reaches more than 1000 L, perform a chloroform recovery operation once.

[0030] Step 5: Perform the operation of recovering chloroform under normal pressure. Open a small amount of steam to heat up the extract in the desolventizing tank 9 to recover chloroform. When the liquid temperature reaches 70 °C, stop heating. Finally, the chloroform is recovered into the chloroform storage tank 12 through the cooler. The recovered chloroform can be recycled, and the remaining hymexazol concentrate is released for crystallization to recover hymexazol.

[0031] Such as Figure 2As shown in the figure, the present invention is a process for re-extracting hymexazol from hymexazol wastewater. The hymexazol wastewater comes from the pipeline after filtration by the crystallization kettle and is introduced into the wastewater metering tank 1. Chloroform is introduced into the chloroform metering tank 2, and the flow rates are controlled by the first rotameter 3 and the second rotameter 4. Then, through the chlorinated plastic alloy extraction pump 5, the hymexazol wastewater and chloroform are simultaneously guided into the static mixer 6 for extraction. After the extraction is completed, the extract enters the liquid separator 7. After the extract stands in the liquid separator 7 for one hour, most of the chloroform extract in the lower layer of the liquid separator 7 is separated into the stripping tank 9 through the guide valve and pipeline. The water layer containing a small amount of chloroform in the upper layer of the liquid separator 7 is discharged into the wastewater discharge tank 8 for continuous sedimentation separation. The generated wastewater overflows and is discharged, and the deposited lower-layer chloroform is recovered;

[0032] The operation of recovering chloroform is carried out under normal pressure. A small amount of steam is turned on to heat up the extract in the stripping tank 9 to recover chloroform. When the liquid temperature reaches 70 °C, the chloroform is recovered into the chloroform storage tank 12 through the primary condenser 10 and the secondary condenser 11. The recovered chloroform can be recycled. When the liquid temperature reaches 90 °C, the chloroform is completely removed, and then hymexazol is released into the crystallization kettle (the melting point of hymexazol is 80 °C - 86 °C). The remaining concentrated hymexazol solution is discharged for crystallization to recover hymexazol.

[0033] In the present invention, 8‰ of hymexazol contained in the hymexazol wastewater can be extracted from the wastewater through chloroform extraction, followed by operations such as stripping and crystallization. After treatment, the water contains less than 1‰ of hymexazol, and the chloroform enters the storage tank after stripping and can be reused, with high utilization efficiency and more environmental protection.

[0034] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0035] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not elaborate on all the details, nor do they limit the present invention to only the specific implementation manners. Obviously, according to the content of this specification, many modifications and variations can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the relevant technical field can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A process for re-extracting hymexazol from hymexazol wastewater, characterized in that, It includes the following steps: S1: Prepare 1000 L of hymexazol wastewater and ensure that there is more than 250 L of chloroform available; S2: Start the extraction pump, adjust the hymexazol wastewater feed valve so that the flowmeter indicates a flow rate of 1000 L / h, adjust the chloroform feed valve so that the flowmeter indicates 200 L / h, and simultaneously introduce the hymexazol wastewater and chloroform into the static mixer for extraction. After extraction is completed, the extract enters the liquid separator; S3: After the extract has been left to stand in the liquid separator for one hour, most of the lower-layer chloroform extract in the liquid separator is separated through the guide valve and pipeline into the stripping tank, and the upper-layer water layer containing a small amount of chloroform in the liquid separator is discharged into the wastewater discharge tank for continued sedimentation separation; S4: Conduct extraction and liquid separation in five batches. When the extract reaches more than 1000 L, perform a chloroform recovery operation once; S5: Conduct the chloroform recovery operation under normal pressure. Start a small amount of steam to heat up the extract in the stripping tank to recover chloroform. When the liquid temperature reaches 70 °C, the chloroform is recovered into the chloroform storage tank through the cooler. When the liquid temperature reaches 90 °C, the chloroform is completely removed, and then the hymexazol is discharged into the crystallization kettle; S6: Based on the above S5, the remaining concentrated hymexazol solution is discharged for crystallization to recover hymexazol.

2. The re-extraction process of hymexazol in the treatment of hymexazol wastewater according to claim 1, characterized in that, In the above S3, the upper-layer water layer containing a small amount of chloroform in the liquid separator is discharged into the wastewater discharge tank for continued sedimentation separation. The generated wastewater is discharged by overflow, and the deposited lower-layer chloroform is recovered.

3. The re - extraction process of hymexazol in the treatment of hymexazol wastewater according to claim 1, characterized in that, The chloroform recovered in the above S5 is recycled, and the melting point of hymexazol in S5 is 80 °C - 86 °C.

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