Catalyst wastewater pretreatment unit in BDO production

Abstract

This utility model relates to the field of wastewater treatment technology, specifically a pretreatment device for catalyst wastewater in BDO production. It includes a catalyst wastewater tank, a filter press, a filtrate collection tank, a filter, a resin tower, and an oxidation reaction tank. A first wastewater pipeline is fixedly connected between the outlet of the wastewater tank and the filter press; a second wastewater pipeline is fixedly connected between the outlet of the filter press and the top inlet of the filtrate collection tank; a first filtrate pipeline is fixedly connected between the lower outlet of the filtrate collection tank and the upper inlet of the filter; a second filtrate pipeline is fixedly connected between the outlet of the filter and the top inlet of the resin tower; and a third filtrate pipeline is fixedly connected between the bottom outlet of the resin tower and the oxidation reaction tank. This utility model has a reasonable and compact structure and is easy to use. It removes acetylene copper catalyst particles, metal ions, formaldehyde, and other organic matter from the catalyst wastewater through the filter press, filter, resin tower, and oxidation reaction tank.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology and is a pretreatment device for catalyst wastewater in BDO production. Background Technology

[0002] There are four common methods for producing 1,4-butanediol (BDO): the acetylene process, the butadiene process, the maleic anhydride process, and the bio-fermentation process. 1,4-Butanediol is a low-toxicity substance. When it comes into contact with infected or injured skin or is ingested, it initially has an anesthetic effect, causing specific pathological changes in the liver and kidneys, and then leads to sudden death due to central nervous system depression (without a long latency period). Therefore, production equipment for 1,4-butanediol should be sealed to prevent leakage, and operators should wear protective equipment. Contact with any open skin is strictly prohibited.

[0003] Catalyst wastewater in BDO production refers to wastewater generated during production and start-up / shutdown of the 1,4-butynediol (BYD) section of BDO production. This wastewater contains formaldehyde, BYD, catalyst (copper acetylene), and other suspended solids. Its chemical oxygen demand (COD) is typically above 10,000 mg / L, making it unsuitable for direct treatment in wastewater treatment plants. Furthermore, copper acetylene is a highly explosive substance sensitive to heat and shock, and is one of the few explosives that does not release gas upon detonation. This results in large volumes of catalyst wastewater discharge, difficult treatment, and high treatment costs.

[0004] Therefore, it is essential to research and invent a catalyst wastewater pretreatment device for BDO production. Summary of the Invention

[0005] This invention provides a catalyst wastewater pretreatment device for BDO production, which overcomes the shortcomings of the prior art and can effectively solve the problems of large catalyst wastewater discharge, difficult treatment, and high treatment cost in existing BDO production.

[0006] The technical solution of this utility model is achieved through the following measures: A catalyst wastewater pretreatment device in BDO production includes a catalyst wastewater tank, a filter press, a filtrate collection tank, a filter, a resin tower, and an oxidation reaction tank. A first wastewater pipeline is fixedly connected between the outlet of the catalyst wastewater tank and the upper inlet of the filter press. A second wastewater pipeline is fixedly connected between the upper outlet of the filter press and the top first inlet of the filtrate collection tank. A first filtrate pipeline is fixedly connected between the lower outlet of the filtrate collection tank and the upper inlet of the filter. A second filtrate pipeline is fixedly connected between the lower outlet of the filter and the top inlet of the resin tower. A third filtrate pipeline is fixedly connected between the bottom outlet of the resin tower and the oxidation reaction tank. A first wastewater discharge pipeline is fixedly connected to the outlet of the oxidation reaction tank.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution: The filter press is fixedly connected to a first nitrogen pipeline at the top inlet, a slag discharge pipeline at the bottom outlet, and a first deionized water pipeline at the second wastewater pipeline.

[0008] The second inlet at the top of the filtrate collection tank is fixedly connected to a second nitrogen pipeline, and the outlet at the top of the filtrate collection tank is fixedly connected to a mixed gas pipeline. A level gauge and a pressure gauge are fixedly installed on the filtrate collection tank.

[0009] Wastewater pumps and filtrate pumps are fixedly installed on the first wastewater pipeline and the first filtrate pipeline, respectively.

[0010] A straight-through sight glass is fixedly installed on the above-mentioned filtrate collection tank, and a filtrate collection and discharge pipeline is fixedly connected to the first filtrate pipeline.

[0011] The third filtrate pipeline is fixedly connected to a second wastewater discharge pipeline.

[0012] The resin tower is connected to a sulfuric acid pipeline at its upper inlet, and an alkali pipeline is connected to the sulfuric acid pipeline.

[0013] A second deionized water pipeline is fixedly connected to the second filtrate pipeline. A third deionized water pipeline is fixedly connected to the third filtrate pipeline between the oxidation reaction tank and the second wastewater discharge pipeline. A third wastewater discharge pipeline is fixedly connected to the second filtrate pipeline between the second deionized water pipeline and the resin tower and the second wastewater discharge pipeline.

[0014] A regulating valve is fixedly installed on the aforementioned gas mixing pipeline.

[0015] The above also includes a PLC controller, which houses a DCS control system. The wastewater pump, filtrate pump, pressure gauge, level gauge, and regulating valve are all electrically connected to the DCS control system.

[0016] This utility model has a reasonable and compact structure and is easy to use. It removes acetylene copper catalyst particles, metal ions, formaldehyde, and other organic matter from catalyst wastewater through a filter press, filter, resin tower, and oxidation reaction tank, while recovering valuable components such as BYD. Simultaneously, it avoids the risk of spontaneous combustion of the acetylene copper catalyst and controls the volatilization of harmful gases (formaldehyde, acetylene). This reduces the load on subsequent wastewater treatment and decreases wastewater discharge. Attached Figure Description

[0017] Appendix Figure 1 This is a schematic diagram of the process flow of this utility model.

[0018] Appendix Figure 1The codes in the diagram are as follows: 1 for catalyst wastewater tank, 2 for filter press, 3 for filtrate collection tank, 4 for filter, 5 for resin tower, 6 for oxidation reaction tank, 7 for first wastewater pipeline, 8 for second wastewater pipeline, 9 for first filtrate pipeline, 10 for second filtrate pipeline, 11 for third filtrate pipeline, 12 for first wastewater discharge pipeline, 13 for first nitrogen pipeline, 14 for slag discharge pipeline, 15 for first deionized water pipeline, 16 for second nitrogen pipeline, 17 for mixed gas pipeline, 18 for pressure gauge, 19 for level gauge, 20 for sight glass, 21 for liquid collection and discharge pipeline, 22 for second wastewater discharge pipeline, 23 for sulfuric acid pipeline, 24 for alkali pipeline, 25 for second deionized water pipeline, 26 for third deionized water pipeline, 27 for third wastewater discharge pipeline, 28 for wastewater pump, 29 for filtrate pump, and 30 for regulating valve. Detailed Implementation

[0019] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0020] Unless otherwise specified, all equipment and devices used in this invention are existing, publicly known, and commonly used equipment and devices in the field.

[0021] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0022] The present invention will be further described below with reference to the embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1 As shown, the catalyst wastewater pretreatment device in the BDO production includes a catalyst wastewater tank 1, a filter press 2, a filtrate collection tank 3, a filter 4, a resin tower 5, and an oxidation reaction tank 6. A first wastewater pipeline 7 is fixedly connected between the outlet of the catalyst wastewater tank 1 and the upper inlet of the filter press 2. A second wastewater pipeline 8 is fixedly connected between the upper outlet of the filter press 2 and the top first inlet of the filtrate collection tank 3. A first filtrate pipeline 9 is fixedly connected between the lower outlet of the filtrate collection tank 3 and the upper inlet of the filter 4. A second filtrate pipeline 10 is fixedly connected between the lower outlet of the filter 4 and the top inlet of the resin tower 5. A third filtrate pipeline 11 is fixedly connected between the bottom outlet of the resin tower 5 and the oxidation reaction tank 6. A first wastewater discharge pipeline 12 is fixedly connected to the outlet of the oxidation reaction tank 6.

[0023] In this invention, catalyst wastewater enters a filter press 2, where solid-liquid separation is performed using a filter press to obtain a filter cake and a filtrate. The filtrate is stored in a filtrate collection tank 3. The filtrate then passes through a filter 4 to further remove solid particles, preventing catalyst particles from entering the resin tower 5. The filtrate with removed solid particles then enters the resin tower 5, where metal ions (mainly Cu) are present. 2+ The formaldehyde in the wastewater is removed, and the resulting deionized wastewater finally enters the oxidation reaction tank 6. By adding hydrogen peroxide and ferrous sulfate to the oxidation reaction tank 6, the formaldehyde in the wastewater is efficiently degraded. The degraded wastewater enters the sewage treatment device through the third filtrate pipeline 11.

[0024] The catalyst wastewater pretreatment unit in the BDO production process can be further optimized and / or improved according to actual needs: Example 2: Its difference from Example 1 is as follows: (See attached) Figure 1 As shown, the first nitrogen pipeline 13 is fixedly connected to the top inlet of the filter press 2, the slag discharge pipeline 14 is fixedly connected to the bottom outlet of the filter press 2, and the first deionized water pipeline 15 is fixedly connected to the second wastewater pipeline 8.

[0025] Example 3: Its difference from Examples 1 to 2 is as follows: (See attached) Figure 1 As shown, the second nitrogen pipeline 16 is fixedly connected to the second inlet at the top of the filtrate collection tank 3, and the mixed gas pipeline 17 is fixedly connected to the top outlet of the filtrate collection tank 3. A level gauge 19 and a pressure gauge 18 are fixedly installed on the filtrate collection tank 3.

[0026] Example 4: Its difference from Examples 1 to 3 is as follows: (See attached) Figure 1 As shown, a wastewater pump 28 and a filtrate pump 29 are fixedly installed on the first wastewater pipeline 7 and the first filtrate pipeline 9, respectively.

[0027] As needed, before the catalyst wastewater enters the filter press 2, high-purity, low-pressure nitrogen is used to purge the filter press 2 and filtrate collection tank 3 through the first nitrogen pipeline 13 until the nitrogen concentration in the filter press 2 and filtrate collection tank 3 is greater than 99%. The wastewater pump 28 is started to pump the catalyst wastewater in the catalyst wastewater pool 1 into the filter press 2; when the liquid level in the filtrate collection tank 3 begins to rise, the wastewater pump 28 is stopped, and nitrogen at a pressure of 360 kPa is introduced into the filter press 2 again through the first nitrogen pipeline 13. The nitrogen pressure is used to force the catalyst wastewater in the filter press 2 into the filtrate collection tank 3, achieving preliminary solid-liquid separation of the catalyst wastewater.

[0028] When the liquid level in the filtrate collection tank 3 rises to 80%, the pressure filtration operation is stopped. The filtrate collection tank 3 is left to stand for 4 hours until the BYD in the filtrate separates from the water. Then, the filtrate pump 29 is started to transport the aqueous phase at the bottom of the filtrate collection tank 3 to the resin tower 5 through the first filtrate pipeline 9.

[0029] Differential pressure gauges can be installed at the inlet and outlet of filter press 2 as needed. During the filtration of catalyst wastewater, the differential pressure in filter press 2 should be observed periodically. When the differential pressure exceeds 200 kPa, the filter cake in filter press 2 needs to be discharged: pressurize filter press 2 through the first nitrogen pipeline 13 until the pressure in filter press 2 reaches 300 kPa, and discharge the waste catalyst filter cake into a drum through the slag discharge pipeline 14. During this period, maintain the pressure inside filter press 2 at 300 kPa. After the filter cake is discharged, control the backwashing pressure to 80 kPa to 100 kPa, and backwash the filter element and filter bag in filter press 2 for 15 minutes through the first deionized water pipeline 15. After the backwashing is completed, continue the filtration operation as needed.

[0030] During the filter press process, due to the pressure change inside the filter press tank 2, acetylene gas, a small amount of formaldehyde gas and other gases in the filtrate will be released. The released acetylene gas and formaldehyde gas accumulated in the filtrate collection tank 3 are sent to the waste gas incineration device through the mixed gas pipeline 17 and the venting flare system to completely decompose the harmful gases.

[0031] Example 5: It differs from Examples 1 to 4 in that, as shown in the appendix... Figure 1 As shown, a straight-through sight glass 20 is fixedly installed on the filtrate collection tank 3, and a filtrate collection discharge pipeline 21 is fixedly connected to the first filtrate pipeline 9.

[0032] As needed, observe through the sight glass 20. When the BYD oil phase in the filtrate collection tank 3 is level with the first filtrate line 9 at the inlet of the filtrate pump 29, collect the BYD oil phase into the BYD collection tank through the collection discharge line 21.

[0033] Example 6: Its difference from Examples 1 to 5 is as follows: (See attached) Figure 1 As shown, the third filtrate pipeline 11 is fixedly connected to the second wastewater discharge pipeline 22.

[0034] Example 7: Its difference from Examples 1 to 6 is as follows: (See attached) Figure 1 As shown, a sulfuric acid pipeline 23 is fixedly connected to the upper inlet of the resin tower 5, and an alkali pipeline 24 is fixedly connected to the sulfuric acid pipeline 23.

[0035] Example 8: It differs from Examples 1 to 7 in that: as shown in the appendix Figure 1 As shown, a second deionized water pipeline 25 is fixedly connected to the second filtrate pipeline 10. A third deionized water pipeline 26 is fixedly connected between the third filtrate pipeline 11 between the oxidation reaction tank 6 and the second wastewater discharge pipeline 22 and the second deionized water pipeline 25. A third wastewater discharge pipeline 27 is fixedly connected between the second filtrate pipeline 10 between the second deionized water pipeline 25 and the resin tower 5 and the second wastewater discharge pipeline 22.

[0036] As needed, a 0.5nm precision wound filter element can be used inside filter 4 to remove suspended solids in the filtrate and prevent catalyst particles from entering resin tower 5, thus reducing the resin's lifespan. The resin in resin tower 5 can be CH-90Na chelating ion exchange resin (iminodiacetic acid groups). CH-90Na chelating ion exchange resin is effective against Cu... 2+ It has high selectivity, large adsorption capacity, and can be repeatedly regenerated.

[0037] When Cu in the wastewater at the outlet of resin tower 5 2+ When the concentration reaches 5 mg / L or above, resin regeneration operation is required for resin tower 5. During the resin regeneration operation, the mass concentration of sulfuric acid used is 4% to 5%, and the mass concentration of NaOH alkaline solution is 5%. The regeneration wastewater generated during the resin regeneration process is discharged into the deionization wastewater pool through the third wastewater discharge pipeline 27 and the second wastewater discharge pipeline 22.

[0038] Example 9: It differs from Examples 1 to 8 in that: as shown in the appendix Figure 1 As shown, a regulating valve 30 is fixedly installed on the mixed gas pipeline 17.

[0039] Example 10: It differs from Examples 1 to 9 in that, as shown in the appendix... Figure 1 As shown, it also includes a PLC controller, in which a DCS control system is installed. The wastewater pump 28, the filtrate pump 29, the pressure gauge 18, the level gauge 19, and the regulating valve 30 are all electrically connected to the DCS control system.

[0040] Depending on the needs, the pipelines and equipment of the catalyst wastewater pretreatment unit in this BDO production process may also be equipped with conventional valves, thermometers, and pressure gauges known in the art, as required by production needs. The PLC controller can be a Siemens S7-1500, which is equipped with a Yokogawa CS3000 DCS control system.

[0041] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

[0042] The usage process of this utility model embodiment is as follows: First, the catalyst wastewater enters the filter press tank 2 through the wastewater pump 28. Nitrogen gas is introduced into the filter press tank 2 through the first nitrogen pipeline 13 to filter and separate the catalyst wastewater. The resulting filter cake is discharged through the slag discharge pipeline 14, and the filtrate is stored in the filtrate collection tank 3. Next, the filtrate passes through the filter 4 and the resin tower 5 in sequence to further remove solid particles and metal ions, resulting in deionized wastewater. Finally, the deionized wastewater enters the oxidation reaction tank 6 to efficiently degrade the formaldehyde in the wastewater. After degradation, the wastewater enters the sewage treatment device through the first wastewater discharge pipeline 12.

Claims

1. A pretreatment device for catalyst wastewater in BDO production, characterized in that... The system includes a catalyst wastewater tank, a filter press, a filtrate collection tank, a filter, a resin tower, and an oxidation reaction tank. A first wastewater pipeline is fixedly connected between the outlet of the filter press and the upper inlet of the filter press. A second wastewater pipeline is fixedly connected between the upper outlet of the filter press and the first inlet at the top of the filtrate collection tank. A first filtrate pipeline is fixedly connected between the lower outlet of the filtrate collection tank and the upper inlet of the filter. A second filtrate pipeline is fixedly connected between the lower outlet of the filter and the top inlet of the resin tower. A third filtrate pipeline is fixedly connected between the bottom outlet of the resin tower and the oxidation reaction tank. A first wastewater discharge pipeline is fixedly connected to the outlet of the oxidation reaction tank.

2. The catalyst wastewater pretreatment device for BDO production according to claim 1, characterized in that... The filter press tank has a first nitrogen pipeline fixedly connected to the top inlet, a slag discharge pipeline fixedly connected to the bottom outlet, and a first deionized water pipeline fixedly connected to the second wastewater pipeline.

3. The catalyst wastewater pretreatment device for BDO production according to claim 1 or 2, characterized in that... The second inlet at the top of the filtrate collection tank is fixedly connected to a second nitrogen pipeline, and the outlet at the top of the filtrate collection tank is fixedly connected to a mixed gas pipeline. A level gauge and a pressure gauge are fixedly installed on the filtrate collection tank.

4. The catalyst wastewater pretreatment device for BDO production according to claim 3, characterized in that... Wastewater pumps and filtrate pumps are fixedly installed on the first wastewater pipeline and the first filtrate pipeline, respectively.

5. The catalyst wastewater pretreatment device for BDO production according to claim 1, 2, or 4, characterized in that... A straight-through sight glass is fixedly installed on the filtrate collection tank, and a first filtrate pipeline is fixedly connected to the filtrate collection and discharge pipeline.

6. The catalyst wastewater pretreatment device for BDO production according to claim 5, characterized in that... The third filtrate pipeline is fixedly connected to the second wastewater discharge pipeline.

7. The catalyst wastewater pretreatment device for BDO production according to claim 1, 2, 4, or 6, characterized in that... A sulfuric acid pipeline is fixedly connected to the upper inlet of the resin tower, and an alkali pipeline is fixedly connected to the sulfuric acid pipeline.

8. The catalyst wastewater pretreatment device for BDO production according to claim 7, characterized in that... A second deionized water pipeline is fixedly connected to the second filtrate pipeline. A third deionized water pipeline is fixedly connected to the third filtrate pipeline between the oxidation reaction tank and the second wastewater discharge pipeline. A third wastewater discharge pipeline is fixedly connected to the second filtrate pipeline between the second deionized water pipeline and the resin tower and the second wastewater discharge pipeline.

9. The catalyst wastewater pretreatment device for BDO production according to claim 4, 6, or 8, characterized in that... A regulating valve is fixedly installed on the gas mixing pipeline.

10. The catalyst wastewater pretreatment device for BDO production according to claim 9, characterized in that... It also includes a PLC controller, which houses a DCS control system. The wastewater pump, filtrate pump, pressure gauge, level gauge, and regulating valve are all electrically connected to the DCS control system.

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