CN210215055U - Processing apparatus of sodium sulfate waste liquid in coal tar production process - Google Patents
Processing apparatus of sodium sulfate waste liquid in coal tar production process Download PDFInfo
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- CN210215055U CN210215055U CN201920673065.0U CN201920673065U CN210215055U CN 210215055 U CN210215055 U CN 210215055U CN 201920673065 U CN201920673065 U CN 201920673065U CN 210215055 U CN210215055 U CN 210215055U
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Abstract
The utility model discloses a treatment device for sodium sulfate waste liquid in the coal tar production process, which is characterized in that the treatment device comprises a fraction washing and decomposing system for dephenolizing and washing tar three-mixed fraction generated in the tar processing and production process; an oil-water separator for separating oil from water in the waste sodium sulfate solution from fraction washing and decomposing system, delivering the separated crude phenol to the crude phenol product tank via centrifugal pump and pipeline, and delivering the separated sodium sulfate solution to reactor via centrifugal pump and pipeline. The utility model has the advantages that: the water in the sodium sulfate waste liquid is distilled and recycled, and the sodium sulfate waste liquid is used as a solvent of a dilute sodium hydroxide solution for dephenolizing and washing tar tertiary mixed fraction, so that the water of a washing and decomposing unit is recycled in the tar processing and production process, no waste liquid is discharged from the whole production unit, and the risk and the cost of waste liquid treatment are avoided.
Description
Technical Field
The utility model relates to a coal tar processing production field, more specifically say so, relate to a processing apparatus of sodium sulfate waste liquid in coal tar production process.
Background
In the process of processing and producing coal tar, a fraction washing and decomposing unit is one of important constituent units, unwashed three-mixed fraction from a tar distillation device is subjected to alkali washing by a sodium hydroxide solution to obtain washed fraction and alkaline sodium phenolate, the washed fraction is used as a raw material for producing industrial naphthalene and enters a subsequent industrial naphthalene preparation unit, and the alkaline sodium phenolate is decomposed by a sulfuric acid method or a carbon dioxide method. The carbon dioxide method has the advantages of complex process flow, high investment, low decomposition efficiency and immature process flow. The sulfuric acid method has the advantages of simple process flow, good decomposition effect, low investment, small occupied area and simple operation, and has the defects that sodium sulfate waste liquid is generated in the production process, the sodium sulfate waste liquid contains sodium sulfate and sulfuric acid, high-concentration crude phenol and partial waste oil, the average COD (chemical oxygen demand) content of the sodium sulfate waste liquid reaches hundreds of thousands of ppm, and if the sodium sulfate waste liquid is directly discharged, the environment is greatly damaged, so the sodium sulfate waste liquid needs to be reasonably and effectively treated, and how to treat the generated sodium sulfate waste liquid becomes a main reason for limiting the popularization of the sulfuric acid method.
At present, coal tar processing enterprises have not satisfied the treatment mode of the sodium sulfate waste liquid. Coal tar processing enterprises try to send the sodium sulfate waste liquid to a coal gas purification solvent unit of a coking enterprise for dephenolization, and then mix the sodium sulfate waste liquid with coking wastewater AAO, namely, an anaerobic-anoxic-aerobic process is used for treatment, so that high salinity and a small amount of residual phenolic organic matters in the wastewater easily cause dehydration and poisoning of microorganisms, the bacterial activity is reduced, and the efficiency of a system for treating common coking wastewater is reduced; meanwhile, the high cost for treating the waste liquid also increases the production cost of coal tar processing enterprises, and becomes a bottleneck for limiting the development of the coal tar processing enterprises.
Therefore, the development of a treatment device and a treatment method for sodium sulfate waste liquid, which can protect the environment, reduce the treatment cost of waste liquid of enterprises and realize the water recycling of a fraction washing and decomposing unit, is urgently needed in the field.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the not enough of current product, and provide a processing apparatus of sodium sulfate waste liquid in coal tar production process, its sodium sulfate waste liquid that is arranged in handling coal tar processing production process specially. Can realize fraction washing decomposition unit's water cycle and use, whole unit does not have the waste liquid and discharges, has avoided waste liquid treatment's risk and expense, and solid salt sodium sulfate is sold outward simultaneously and can also bring partly extra income, simultaneously, the utility model has the advantages of reasonable design, easy operation, safety ring protect.
The utility model relates to a treatment device for sodium sulfate waste liquid in the coal tar production process, which comprises a fraction washing and decomposing system for dephenolizing and washing the tar three-mixed fraction generated in the tar processing and production process; an oil-water separator for separating oil from water in the waste sodium sulfate solution from fraction washing and decomposing system, feeding the separated crude phenol into crude phenol product tank via centrifugal pump and pipeline, and feeding the separated sodium sulfate solution into reactor via centrifugal pump and pipeline;
a reactor for reacting the sodium sulfate solution with the dilute sodium hydroxide solution delivered from the lye tank through the centrifugal pump and delivering the reacted sodium sulfate solution to the MVR evaporator through the centrifugal pump and the pipeline for evaporation;
an MVR evaporator which is used for distilling water in the sodium sulfate waste liquid and then is used as a solvent for preparing a dilute sodium hydroxide solution required by the distillate washing decomposition unit;
a centrifuge for subjecting the solid-liquid mixture discharged from the MVR evaporator to a second solid-liquid separation;
a water storage tank for storing the water distillation generated by the MVR evaporator and conveying condensed water to the solid caustic soda dissolving tank through a centrifugal pump and a pipeline;
a solid caustic soda dissolving tank which is used for preparing caustic soda (pure NaOH) and condensed water conveyed from the water storage tank into a dilute sodium hydroxide solution with the concentration of 15% and conveying the dilute sodium hydroxide solution to a caustic soda tank through an internal dissolving pump and a pipeline;
and the lye tank is used for storing the dilute sodium hydroxide solution and is connected with the distillate washing and decomposing system through a pipeline.
Further, the oil-water separator is made of S31603 and has a total volume of 41.23m3。
Furthermore, the reactor comprises a reactor body and a stirring paddle; the reactor 3 is made of S31603 with a total volume of 21.1m3Its stirring rake has included motor, speed reducer, stirring rake, and the model is selected for use to the motor: YBPT3-112M-4/4KW, the model is selected as the speed reducer: SK52F-IEC112, 4 groups of 45 degree oblique paddles with the model number of T120 are vertically and evenly distributed on the stirring paddles, and PTFE outer lining is arranged outside the stirring paddles.
Furthermore, the MVR evaporator comprises a preheater, an evaporator, a separator and a compressor, and the material is S30408.
Furthermore, the solid caustic soda dissolving tank is a circulating spray type solid caustic soda dissolving tank, and the material is S30408.
Furthermore, the lye tank is made of Q235B and has a total volume of 90.1m3。
The utility model has the advantages that: adopt the technical scheme provided by the utility model, compare with prior art, have following effect of showing:
(1) the utility model uses the water in the sodium sulfate waste liquid distilled by the MVR evaporator as the solvent for preparing the dilute sodium hydroxide solution required by the distillate washing and decomposing unit, thereby not only solving the difficult problems that the distilled water contains more impurities which can not be directly discharged and is not easy to be treated, but also realizing the water recycling of the distillate washing and decomposing (the decomposition adopts the sulfuric acid method) unit in the coal tar processing and production;
(2) the whole device system of the utility model runs in a closed way, and the solid and liquid generated by each monomer device are completely recycled without discharging any waste liquid, waste residue and waste gas;
(3) the reactor of the utility model fully and uniformly mixes the dilute sodium hydroxide solution and the sodium sulfate waste liquid through the internal stirring paddle and then carries out neutralization reaction, so that the sodium sulfate waste liquid is neutral, thereby reducing the corrosion of the waste liquid to the subsequent pipelines and equipment of the device;
(4) the utility model discloses a centrifuge carries out solid-liquid separation once more with MVR evaporimeter exhaust solid-liquid mixture, makes the Na of production2SO485% of the total amount of the product can completely meet the requirement of sale;
(5) compared with the common single-effect falling film or multi-effect falling film evaporator, the MVR evaporator adopted by the utility model has the advantages of low energy consumption and low operating cost of the whole device;
(6) the utility model relates to an equipment is few, simple structure, reliable, low in manufacturing cost.
Drawings
FIG. 1 is a schematic view of the process and apparatus of the present invention;
FIG. 2 is a schematic structural view of the oil-water separator of the present invention;
FIG. 3 is a schematic structural view of the reactor of the present invention;
FIG. 4 is a schematic structural diagram of the MVR evaporator of the present invention;
FIG. 5 is a schematic structural view of the lye tank of the present invention;
in the figure: a distillate washing and decomposing system 1, an oil-water separator 2, a reactor 3, an MVR evaporator 4, a centrifuge 5, a water storage tank 6, a solid alkali dissolving tank 7 and an alkali liquor tank 8.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
In the figure, the utility model discloses a treatment device for sodium sulfate waste liquid in the coal tar production process, which comprises a fraction washing and decomposing system 1 for dephenolizing and washing the tar three-mixed fraction generated in the tar processing and production process; an oil-water separator 2 for separating oil from water in the sodium sulfate waste liquid of the fraction washing decomposition system 1, feeding the separated crude phenol into a crude phenol product tank through a centrifugal pump and a pipeline, and feeding the separated sodium sulfate solution into a reactor 3 through the centrifugal pump and the pipeline; a reactor 3 for reacting the sodium sulfate solution with the dilute sodium hydroxide solution delivered from the lye tank by the centrifugal pump and delivering the reacted sodium sulfate solution to the MVR evaporator 4 for evaporation by the centrifugal pump and the pipeline; an MVR evaporator 4 which is used for distilling water in the sodium sulfate waste liquid and then is used as a solvent for preparing a dilute sodium hydroxide solution required by the distillate washing decomposition unit; a centrifuge 5 for subjecting the solid-liquid mixture discharged from the MVR evaporator 4 to a second solid-liquid separation; a water storage tank 6 for storing the water distillation generated by the MVR evaporator 4 and conveying condensed water to a solid caustic soda dissolving tank 7 through a centrifugal pump and a pipeline; a solid caustic soda dissolving tank 7 which is used for preparing dilute sodium hydroxide solution with concentration of 15% from caustic soda pure NaOH and condensed water conveyed from the water storage tank 6 and conveying the dilute sodium hydroxide solution to a caustic soda liquid tank 8 through an internal dissolving pump and a pipeline; a lye tank 8 for storing dilute sodium hydroxide solution and connected with the fraction washing and decomposing system 1 through a pipeline.
With reference to the attached figure 2, the oil-waterThe separator 2 was made of S31603 and had a total volume of 41.23m3。
With reference to fig. 3, the reactor 3 includes a reactor body and a stirring paddle; the reactor 3 is made of S31603 with a total volume of 21.1m3Its stirring rake has included motor, speed reducer, stirring rake, and the model is selected for use to the motor: YBPT3-112M-4/4KW, the model is selected as the speed reducer: SK52F-IEC112, 4 groups of 45 degree oblique paddles with the model number of T120 are vertically and evenly distributed on the stirring paddles, and PTFE outer lining is arranged outside the stirring paddles.
Referring to fig. 4, the MVR evaporator 4 includes a preheater 41, an evaporator 42, a separator 44, and a compressor 43, and the material is S30408; the reactor 3 reacts the sodium sulfate solution with the dilute sodium hydroxide solution delivered from the lye tank through the centrifugal pump, the reacted sodium sulfate solution is delivered to the MVR evaporator 4 through the centrifugal pump and the pipeline for evaporation, the reacted sodium sulfate solution enters the evaporator 42 through the preheater 41 and is evaporated in the evaporator 42 and then enters the separator 44 for separation, the secondary steam generated by the separator 44 enters the compressor 43 for pressurization and then circularly enters the evaporator 42, and the generated condensed water automatically flows into the water storage tank through the pipeline.
The solid caustic soda dissolving tank 7 is a circulating spray type solid caustic soda dissolving tank, and the material is S30408;
with reference to FIG. 5, the lye tank 8 is made of Q235B and has a total volume of 90.1m3。
A method for using a sodium sulfate waste liquid treatment device in the coal tar processing production process is characterized in that a distillate washing and decomposing system 1 comprises a washing dephenolizing device adopting a continuous washing process and a sodium phenolate decomposing device adopting a sulfuric acid method, wherein the distillate washing and decomposing system 1 is connected with an oil-water separator 2 through a centrifugal pump and a pipeline, and sodium sulfate waste liquid generated by the distillate washing and decomposing system 1 is discharged into the oil-water separator 2 for oil-water separation; the crude phenol separated by the oil-water separator 2 is directly sent into a crude phenol product tank through a centrifugal pump and a pipeline, and the separated sodium sulfate solution is sent into a reactor 3 through the centrifugal pump and the pipeline; the reactor 3 is used for mixing the sodium sulfate solution with the dilute hydrogen delivered from the lye tank through the centrifugal pumpReacting the sodium oxide solution, and conveying the reacted sodium sulfate solution to the MVR evaporator 4 through a centrifugal pump and a pipeline for evaporation; condensed water generated by the MVR evaporator 4 automatically flows to a water storage tank through a pipeline, and generated sodium sulfate concentrated solution automatically flows to a centrifugal machine 5 through a pipeline for separation; the centrifuge 5 is used for spin-drying the sodium sulfate concentrated solution to obtain the sodium sulfate concentrated solution containing 85 percent of Na2SO4The separated solution flows to the oil-water separator automatically through a pipeline; the water storage tank 6 conveys condensed water to a solid caustic soda dissolving tank 7 through a centrifugal pump and a pipeline; the solid caustic soda dissolving tank 7 prepares dilute sodium hydroxide solution with concentration of 15% from caustic soda pure NaOH and condensed water conveyed from the water storage tank 6; the diluted sodium hydroxide solution prepared in the solid caustic soda dissolving tank 7 is conveyed to a caustic soda tank 8 through a dissolving pump and a pipeline in the solid caustic soda dissolving tank; the fraction washing and decomposing system 1 carries out dephenolization washing on the dilute sodium hydroxide solution in the lye tank 8 and the tar three-mixed fraction generated in the tar processing and production process.
The washing dephenolization in the fraction washing decomposition system 1 uses a dilute sodium hydroxide solution with the concentration of 15% to wash tar tertiary mixed fraction generated in the tar processing production process, and the dilute sodium hydroxide solution used in the washing process is excessive to make the generated sodium phenolate alkaline.
The fraction washing decomposition system 1 adopts a sulfuric acid method for decomposition, the concentration of the used sulfuric acid is 98%, and the pH value of the generated sodium sulfate waste liquid is between 4 and 5 and is acidic.
The reactor 3 is internally provided with a stirring paddle, the pH value of the sodium sulfate solution after reaction is 7, and the solution is neutral.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all utilize the equivalent structure or equivalent flow transformation that the content of the specification does, or directly or indirectly use in other related technical fields, all including in the same way the patent protection scope of the present invention.
Claims (6)
1. A treatment device for sodium sulfate waste liquid in the coal tar production process is characterized by comprising
A fraction washing and decomposing system (1) for dephenolizing and washing the tar tertiary mixed fraction generated in the tar processing and production process;
an oil-water separator (2) for separating oil and water from the sodium sulfate waste liquid in the fraction washing and decomposing system (1), feeding the separated crude phenol into a crude phenol product tank through a centrifugal pump and a pipeline, and feeding the separated sodium sulfate solution into a reactor (3) through the centrifugal pump and the pipeline;
a reactor (3) for reacting the sodium sulfate solution with the dilute sodium hydroxide solution delivered from the lye tank by the centrifugal pump and delivering the reacted sodium sulfate solution to the MVR evaporator (4) for evaporation by the centrifugal pump and the pipeline;
an MVR evaporator (4) which is used for distilling water in the sodium sulfate waste liquid and then is used as a solvent for preparing a dilute sodium hydroxide solution required by the distillate washing decomposition unit;
a centrifuge (5) for subjecting the solid-liquid mixture discharged from the MVR evaporator (4) to a second solid-liquid separation;
a water storage tank (6) for storing the water distillation generated by the MVR evaporator (4) and conveying condensed water to a solid caustic soda dissolving tank (7) through a centrifugal pump and a pipeline;
a solid caustic soda dissolving tank (7) which is used for preparing caustic soda pure NaOH and condensed water conveyed from the water storage tank (6) into a dilute sodium hydroxide solution with the concentration of 15% and conveying the dilute sodium hydroxide solution to a caustic soda liquid tank (8) through an internal dissolving pump and a pipeline;
a lye tank (8) which is used for storing dilute sodium hydroxide solution and is connected with the fraction washing and decomposing system (1) through a pipeline.
2. The device for treating the sodium sulfate waste liquid in the coal tar production process according to claim 1, wherein the oil-water separator (2) is made of S31603 and has a total volume of 41.23m3。
3. The device for treating the sodium sulfate waste liquid in the coal tar production process according to claim 1, wherein the reactor (3) comprisesComprises a reactor body and a stirring paddle; the reactor (3) is made of S31603 with a total volume of 21.1m3The stirring paddle comprises a motor, a speed reducer and a stirring paddle, 4 groups of 45-degree inclined paddles with the types of blades being T120 are vertically and evenly distributed are selected as the stirring paddle, and a PTFE outer lining is arranged outside the stirring paddle.
4. The device for treating the sodium sulfate waste liquid in the coal tar production process according to claim 1, wherein the MVR evaporator (4) comprises a preheater, an evaporator, a separator and a compressor, and the material is S30408.
5. The device for treating the sodium sulfate waste liquid in the coal tar production process according to claim 1, wherein the solid alkali dissolving tank (7) is a circulating spraying type solid alkali dissolving tank and is made of S30408.
6. The device for treating the sodium sulfate waste liquid in the coal tar production process according to claim 1, wherein the lye tank (8) is made of Q235B and has a total volume of 90.1m3。
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| CN110054338A (en) * | 2019-05-13 | 2019-07-26 | 马钢奥瑟亚化工有限公司 | The processing unit and application method of sodium sulfate waste liquid in a kind of coal tar oil production process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110054338A (en) * | 2019-05-13 | 2019-07-26 | 马钢奥瑟亚化工有限公司 | The processing unit and application method of sodium sulfate waste liquid in a kind of coal tar oil production process |
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