Nylon 6 slice extraction water purification system

Abstract

The utility model relates to the related technical field of nylon 6 slice preparation, in particular to a nylon 6 slice extraction water purification system. Comprising a candle filter, an efficient fiber ball filter, a hot water storage bin, a pure recovery extraction water storage tank, a backwashing water collecting tank, a cation exchanger, an anion exchanger, an anti-corrosion pump, an acid solution tank, an alkaline solution tank and a water pump, the efficient fiber ball filter comprises an inlet, a fiber ball layer, a fiber ball replacement inlet, an electric stirrer, a left valve, a right valve, a hot water input port and an extracted water outlet, and a differential pressure sensor is arranged at the pipeline joint on one side of the hot water input port. According to the nylon-6 slice extraction water purification system, the extraction water purification effect can be well improved and the service life of the cation exchanger and the anion exchanger can be well prolonged by adding multiple times of filtration of extraction water, cleaning of the efficient fiber ball filter and resin regeneration of the anion-cation filter.

Description

TECHNICAL FIELD

[0001] The utility model relates to nylon 6 slice preparation related technical field especially, it relates to a kind of nylon 6 slice extraction water purification system. BACKGROUND

[0002] TiO2 is used in the preparation process of matt, semi-matt nylon 6 slice, since the purity of commercially available TiO2 cannot reach 100%, contains inorganic ions, after the slice prepared is extracted, a large amount of inorganic ions such as K + , Na + , Ca 2 + And SO4 2- , phosphate and silicate ions etc. are contained in extraction water, inorganic ions cannot be removed by evaporation, and after multiple cycles, they are enriched in the reactor, greatly affect the micro-chemical environment of subsequent oligomer cracking and nylon 6 hydrolytic polymerization, which is not conducive to the controllable performance of cracking reaction and has adverse effects on polycondensation, chain exchange and end-capping reaction in the process of nylon 6 polymerization, therefore, it is necessary to filter and remove inorganic ions from extraction water.

[0003] According to the analysis of the properties of the extraction water stock solution, the cations in the extraction water mainly include Ca 2+ , K + , Na + , and the anions mainly include sulfate, phosphate and silicate ions, etc. Patent No. CN105948333 A discloses a method for removing inorganic ions from nylon 6 slice extraction water and a removal device, which filters the raw water through a filter, reacts in a first resin regeneration tank, a second resin regeneration tank, a third resin regeneration tank, a fourth resin regeneration tank reactor, and a resin trap processor recovery tank, effectively removing inorganic salts, suspended solids, colloids and other impurities in the raw water. Patent No. CN111527051 B discloses a method for recycling extraction water in the production of polyamide 6, which filters the extraction water with at least one filtration unit and purifies the filtered extraction water in an ion exchange module.

[0004] At present, the above-mentioned patent technology is mainly used for the purification of extraction water, and recycling is realized, but in actual industrial application, due to the unstable turbidity of the extraction water stock solution and the large coefficient of variation of the stock solution water quality, the existing technology easily leads to short service life of the ion exchanger. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a kind of nylon 6 slice extraction water purification system, to solve the problem of short service life of ion exchanger in actual industrial application due to the unstable turbidity of the extraction water stock solution and the large coefficient of variation of the stock solution water quality in the above background technology.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: a nylon 6 slice extraction water purification system, including candle type filter, high -efficient fiber ball filter, hot water storage bin, pure recovery extraction water storage tank, backwash water collecting groove, cation exchanger, anion exchanger, anticorrosive pump, acid solution tank, basic solution tank and water pump, the high -efficient fiber ball filter includes inlet, fiber ball layer, fiber ball replacement entrance, electric mixer, left valve, right valve, hot water input and extraction water outlet, one side pipeline junction of hot water input is provided with pressure difference sensor.

[0007] Preferably, the hot water temperature in the hot water storage bin is greater than or equal to 85 DEG C.

[0008] Preferably, the candle type filter is provided with two groups, and the water pump is provided with three groups.

[0009] Preferably, the candle type filter and high -efficient fiber ball filter pipeline connection are arranged with AV01 valve, AV02 valve and AV03 valve respectively.

[0010] Preferably, the hot water storage bin and high -efficient fiber ball filter upper end hot water input pipeline connection are arranged, and the backwash water collecting groove and high -efficient fiber ball filter lower end inlet pipeline connection.

[0011] Preferably, the pure recovery extraction water storage tank is connected with two groups of candle type filters respectively through AV06 valve and AV02 valve.

[0012] Preferably, the cation exchanger and acid solution tank pipeline connection are arranged, the anion exchanger and basic solution tank pipeline connection are arranged, and anticorrosive pump is installed in the pipeline.

[0013] Compared with the prior art, the utility model has the advantages that: the nylon 6 slice extraction water purification system can improve the extraction water purification effect and the service life of cation exchanger and anion exchanger by increasing the multiple filtration of extraction water, the cleaning of high -efficient fiber ball filter and the regeneration of cation and anion filter resin. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is the utility model nylon 6 slice extraction water purification system schematic diagram;

[0015] Fig. 2 It is the utility model high -efficient fiber ball filter structure schematic diagram.

[0016] In the figure: 1, candle filter; 2, high efficiency fiber ball filter; 3, hot water storage bin; 4, pure recovery extraction water storage tank; 5, backwash water collection tank; 6a, cation exchanger; 6b, anion exchanger; 7, corrosion pump; 8a, acidic solution tank; 8b, alkaline solution tank; 9, water pump; 11, inlet; 12, fiber ball layer; 13, fiber ball replacement inlet; 14, electric agitator; 15, left valve; 16, right valve; 17, hot water input; 18, extraction water outlet. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0018] Please refer to Figs. 1-2 The utility model provides a kind of technical solutions: a kind of nylon 6 slice extraction water purification system, including candle filter 1, high efficiency fiber ball filter 2, hot water storage bin 3, pure recovery extraction water storage tank 4, backwash water collection tank 5, cation exchanger 6a, anion exchanger 6b, corrosion pump 7, acidic solution tank 8a, alkaline solution tank 8b and water pump 9, high efficiency fiber ball filter 2 includes inlet 11, fiber ball layer 12, fiber ball replacement inlet 13, electric agitator 14, left valve 15, right valve 16, hot water input 17 and extraction water outlet 18, and the side pipeline connection of hot water input 17 is provided with differential pressure sensor.

[0019] Further, the hot water temperature in hot water storage bin 3 is greater than or equal to 85 DEG C.

[0020] Further, two groups of candle filters 1 are provided, and three groups of water pumps 9 are provided.

[0021] Further, the candle filter 1 and the high efficiency fiber ball filter 2 are connected by pipelines, and the pipelines are respectively provided with AV01 valve, AV02 valve and AV03 valve.

[0022] Further, the hot water storage bin 3 is connected by pipeline with the hot water input 17 at the upper end of the high efficiency fiber ball filter 2, and the backwash water collection tank 5 is connected by pipeline with the inlet 11 at the lower end of the high efficiency fiber ball filter 2.

[0023] Further, the pure recovery extraction water storage tank 4 is connected by pipeline with two groups of candle filters 1 respectively, and is controlled by AV06 valve and AV02 valve.

[0024] Further, the cation exchanger 6a is connected with the acid solution tank 8a by pipeline, and the anion exchanger 6b is connected with the alkaline solution tank 8b by pipeline, and the pipelines are provided with corrosion-proof pumps 7.

[0025] Further, the extraction water purification process is as follows:

[0026] Step one: first, the extraction water is pumped by the water pump 9 from the pipeline into the candle filter 1 for preliminary filtration,

[0027] Step two: then the AV01 valve is opened to enter the high-efficiency fiber ball filter 2 for filtering granular filter materials such as quartz sand,

[0028] Step three: after filtration, the AV03 valve is opened to enter the pure recycled extraction water storage tank 4,

[0029] Step four: the AV06 valve is opened, and the pure recycled extraction water is pumped by another set of water pumps 9 from the pipeline into the candle filter 1 for re-filtration,

[0030] Step five: the AV07 valve is opened to enter the cation exchanger 6a and the anion exchanger 6b to remove inorganic ions in the pure water, and the purified extraction is output from the outlet.

[0031] Further, the extraction water multiple filtration process is as follows:

[0032] When the cation and anion exchange resins of the cation exchanger 6a and the anion exchanger 6b used are new resins, the purified extraction water will contain resin powder, the AV09 valve is opened, and the filtered extraction water is pumped from the conveying pipe into the pure recycled extraction water storage tank 4 for re-filtration.

[0033] Further, the high-efficiency fiber ball filter 2 filtration process is as follows:

[0034] The extraction water enters from the inlet 11, the left valve 15 and the right valve 16 are opened to make the extraction water pass through the fiber ball layer 12 from the pipeline, and then the extraction water is output from the extraction water outlet 18.

[0035] Further, the high-efficiency fiber ball filter 2 cleaning process is as follows:

[0036] When the differential pressure sensor shows that hot water is input from the hot water input port 17, the hot water enters the fiber ball layer 12 from the pipeline, the electric mixer 14 is opened to stir, the fiber balls are fully cleaned, the left valve 15 and the right valve 16 are opened, the cleaned hot water is output from the pipeline, and the AV05 valve is opened to enter the backwash water collection tank 5 through the pipeline.

[0037] Further, the anion and cation filter resin regeneration process mainly includes the following steps:

[0038] Step 1: open AV10 valve, hot water from the pipeline into the cation exchanger 6a, anion exchanger 6b, the extraction of water in the anion and cation resin is washed away.

[0039] Step 2: open AV11 valve, acid solution through the corrosion pump 7 from the pipeline into the cation exchanger 6a, the cation exchange resin pickling, regeneration, open AV12 valve, the alkali solution through the corrosion pump 7 from the pipeline into the anion exchanger 6b, the anion exchange resin for alkali washing, regeneration.

[0040] Step 3: after the completion of the regeneration of anion and cation exchange resin, open AV11 valve, condensate through the corrosion pump 7 from the pipeline into the cation exchanger 6a, clean up the internal residual acid solution, open AV12 valve, condensate through the corrosion pump 7 from the pipeline into the anion exchanger 6b, clean up the internal residual alkali solution.

[0041] Step 4: open AV10 valve, hot water from the pipeline into the cation exchanger 6a, anion exchanger 6b, the condensate in the anion and cation resin is washed away, ensure the temperature of cation exchanger 6a and anion exchanger 6b ≥ 85 ℃.

[0042] Working principle: first, the extraction water is input to the candle filter 1 through the water pump 9 for preliminary filtration, then AV01 is opened, and the extraction water enters from the inlet 11 of the high-efficiency fiber ball filter 2, then the left valve 15 and the right valve 16 are opened, the extraction water enters the fiber ball layer 12 from the pipeline, so that the extraction water is filtered, and then is output from the extraction water outlet 18, at the same time, the AV03 valve is opened, so that the filtered extraction water enters the pure recovery extraction water storage tank 4, then the AV06 valve is opened, and the pure recovery extraction water is filtered again through another group of water pumps 9 from the pipeline into another group of candle filters 1, then the AV07 valve is opened, and the pure recovery extraction water enters the cation exchanger 6a and the anion exchanger 6b to remove inorganic ions in the pure water, then the AV09 valve is opened, so that the filtered extraction water enters the pure recovery extraction water storage tank 4 from the conveying pipe for filtration again, and then the purified extraction is output from the outlet, when cleaning is needed, first, the high-efficiency fiber ball filter 2 is cleaned, the hot water storage bin 3 inputs hot water to the hot water input port 17 through the adjacent water pump 9, then the electric stirrer 14 is opened for stirring, so that the fiber ball is fully cleaned, the left valve 15 and the right valve 16 are opened, the cleaned hot water is output from the pipeline, the AV05 valve is opened, and the cleaned hot water enters the backwashing water collection tank 5 through the pipeline, then the AV10 valve is opened, and the hot water enters the cation exchanger 6a and the anion exchanger 6b from the pipeline, so that the extraction water in the cation and anion resins is cleaned, then the AV11 valve is opened, and the acid solution is conveyed into the cation exchanger 6a from the pipeline through the corrosion pump 7, so that the cation exchange resin is pickled to realize regeneration, the AV12 valve is opened, and the alkali solution is conveyed into the anion exchanger 6b from the pipeline through the corrosion pump 7, so that the anion exchange resin is alkali washed to realize regeneration, after the regeneration of the anion and cation exchange resins is completed, the AV11 valve is opened, and the condensed water is conveyed into the cation exchanger from the pipeline through the corrosion pump 7, so that the residual acid solution in the cation exchanger is cleaned, the AV12 valve is opened, and the condensed water is conveyed into the anion exchanger from the pipeline through the corrosion pump 7, so that the residual alkali solution in the anion exchanger is cleaned, and finally the AV10 valve is opened, and the hot water enters the cation exchanger 6a and the anion exchanger 6b from the pipeline, so that the condensed water in the cation and anion resins is cleaned.

[0043] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A nylon 6 chip extraction water purification system characterized by: The device comprises a candle filter (1), a high-efficiency fiber ball filter (2), a hot water storage bin (3), a pure recycled extraction water storage tank (4), a backwash water collecting tank (5), a cation exchanger (6a), an anion exchanger (6b), a corrosion-proof pump (7), an acid solution tank (8a), an alkaline solution tank (8b), and a water pump (9).

2. A nylon 6 chip extraction water purification system according to claim 1, characterized by: The hot water temperature in the hot water storage bin (3) is greater than or equal to 85℃.

3. A nylon 6 chip extraction water purification system according to claim 1, characterized by: The candle filter (1) is provided with two groups, and the water pump (9) is provided with three groups.

4. The nylon 6 chip water extraction purification system of claim 1, wherein: The candle filter (1) and the high-efficiency fiber ball filter (2) are connected by pipes, and the pipes are respectively provided with AV01 valves, AV02 valves, and AV03 valves.

5. A nylon 6 chip extraction water purification system according to claim 1, characterized by: The hot water storage bin (3) is connected to the upper end of the hot water input port (17) of the high-efficiency fiber ball filter (2) by a pipe, and the backwash water collecting tank (5) is connected to the lower end of the inlet (11) of the high-efficiency fiber ball filter (2) by a pipe.

6. A nylon 6 chip extraction water purification system according to claim 1, characterized by: The pure recycled extraction water storage tank (4) is connected to two groups of candle filters (1) by pipes, and is controlled by AV06 valves and AV02 valves.

7. A nylon 6 chip extraction water purification system according to claim 1, characterized by: The cation exchanger (6a) is connected to the acid solution tank (8a) by a pipe, and the anion exchanger (6b) is connected to the alkaline solution tank (8b) by a pipe, and corrosion-proof pumps (7) are installed on the pipes.

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