Regeneration process of a treatment device for recycling nylon spinning oil

Abstract

The invention discloses a treatment device and a regeneration process for recycling nylon spinning oil in the technical field of recycling and regenerating nylon spinning oil. The device comprises an oil standing tank, a sterilizing agent configuration tank, a purification tank, a regenerated oil collecting tank and a condensate recovery tank. The recycled waste spinning oil is purified and separated into regenerated oil and steam after coarse filtration, standing and fine filtration; the steam is condensed into condensate for standby use by a water-cooling jacket, the regenerated oil is added with a sterilizing agent after cooling, and is pressurized by an oil pump, and is finely filtered again and stored for standby use; when spinning is required, the regenerated oil and the condensate are mixed and prepared in proportion, pure water is added as needed, and the mixture is comprehensively used for low-carbon POY and regenerated POY. The recycling of the spinning oil responds to the call of the national circular economy, improves the resource recycling rate, and effectively reduces the pressure of spinning oil treatment on the enterprise, and reduces the inventory pressure and environmental pressure on the enterprise.

Description

Technical Field

[0001] The invention relates to the technical field of nylon spinning oil recycling and regeneration, and in particular to a regeneration process of a nylon spinning oil recycling treatment device. Background Art

[0002] In recent years, the production and environmental pressures faced by many traditional industries in my country have continued to increase, and they have strengthened the optimization of their own industrial structure and the innovation of energy-saving and environmental protection technologies. Among them, the nylon textile industry is included. The current mainstream process of nylon spinning includes slicing feeding, nitrogen protection, screw extruder melting, mixing and metering extrusion, box insulation, transportation, metering pump metering, extrusion, component filtration, refinement and stretching, cooling, oiling and bundling, pre-networking, networking, high-speed winding, temperature and humidity balance, detection, classification, and packaging. In the monomer suction system and network oil mist suction system of the spinning workshop, some spinning oil will remain, and this part of the oil needs to be collected and treated uniformly.

[0003] The monomer suction and network oil mist suction systems in the existing nylon spinning process will suck out a large amount of spinning waste oil. With the continuous development of the nylon industry and the continuous expansion of production capacity, the amount of spinning waste oil generated by the suction system will increase. The treatment method of these spinning waste oils is generally to collect them uniformly first, and then a small part of the waste oil is burned and consumed in the boiler room, and most of the waste oil is treated in the sewage station. These two treatment methods are relatively complicated and the treatment cost is high. However, there are still many small and medium-sized enterprises in the nylon industry that have insufficient or even no treatment capacity for this type of spinning waste oil. They can only choose to keep most of the spinning waste oil recovered in the suction system in the warehouse for a long time, but this choice has brought considerable inventory pressure and environmental pressure to these companies.

[0004] Based on this, the present invention designs a regeneration process of a treatment device for recycling nylon spinning oil to solve the above problems. Summary of the invention

[0005] The purpose of the invention is to provide a regeneration process for a treatment device for recycling nylon spinning oil to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, the invention provides the following technical solutions: a treatment device for recycling nylon spinning oil, comprising an oil static tank, a sterilizing agent configuration tank, a purification tank, a regenerated oil collection tank and a condensate recovery tank;

[0007] The oil agent static tank is connected to the purification tank through a first pipeline, and a first filter is provided on the first pipeline;

[0008] The sterilizing agent configuration tank is connected to the purification tank through a second pipeline;

[0009] The purification tank is connected to the regenerated oil agent collection tank through a third pipeline, and an oil agent pump and a second filter are sequentially arranged on the third pipeline;

[0010] The purification tank is connected to the condensate recovery tank through a fourth pipeline, and a water cooling jacket is provided on the fourth pipeline.

[0011] Preferably, a paddle stirrer is installed on the purification tank.

[0012] Preferably, the purification tank is connected to a steam input pipe and is equipped with a steam control valve, and the steam input pipe is connected to an external steam supply device.

[0013] Preferably, the injection port of the oil agent static tank 1 is provided with a filter with a mesh number of 100, the mesh number of the first filter is 720, and the mesh number of the second filter is 960.

[0014] A regeneration process of a treatment device for recycling nylon spinning oil, comprising the following processing steps:

[0015] Step 1: Add the collected spinning waste oil agent to the oil agent static tank through a filter screen with a precision of 100 meshes, and let it stand in the oil agent static tank for 2 hours, so that some of the solid sediments that pass through the filter screen are settled at the bottom of the tank;

[0016] Step 2: The waste spinning oil passes through the first filter and enters the purification tank through the potential difference, and the addition is stopped when the liquid level accounts for 70% of the total liquid level, and the paddle stirrer is turned on for stirring, and the initial concentration of the spinning oil is measured by sampling through the sampling tube;

[0017] Step 3: Open the steam control valve to heat the spinning oil with steam; the heated steam is condensed through the water-cooled jacket 5 and collected in the condensate recovery tank, and the remaining regenerated oil is placed in the purification tank for cooling treatment;

[0018] Step 4: Prepare the bactericide and surfactant in the bactericide preparation tank, and add the bactericide solution and surfactant solution according to the actual liquid after the temperature in the purification tank drops to 40°C;

[0019] Step 5: After the regenerated oil and the sterilizing agent are fully mixed, the oil pump is used to increase the pressure, and then the oil is filtered through the second filter and enters the regenerated oil collection tank;

[0020] Step 6: When there is a demand for spinning low-carbon POY and recycled POY, the recycled oil and condensate after concentration testing and analysis will be added with pure water as needed to prepare special oil for low-carbon POY and recycled POY production.

[0021] Preferably, in step three, the steam heating spinning oil is controlled to have a heating temperature range of 90° C.-100° C., and a heating time of 4 hours.

[0022] Preferably, in step 4, the bactericidal agent configured in the bactericidal agent configuration tank is a dynamically proportioned mixture of isothiazolinone-bronopol-ethylene glycol with a concentration of 5%; the surfactant configured in the bactericidal agent configuration tank is polyoxyethylene laurate and dodecyldiethanolamine.

[0023] Preferably, in step 4, after adding the bactericide solution into the purification tank, the bactericide concentration of the regenerated oil is 500-700 ppm.

[0024] Compared with the prior art, the invention has the following beneficial effects:

[0025] The patented design of the present invention invents a regeneration process of a treatment device for recycling nylon spinning oil. The recycled spinning waste oil is purified and separated into regenerated oil and steam after coarse filtration, standing and fine filtration. The steam is condensed into condensate by a water-cooled jacket for standby use. The regenerated oil is cooled and then added with a sterilizing agent, then pressurized by an oil pump, and then finely filtered again and stored for standby use. When spinning is required, the regenerated oil and condensate are mixed and prepared in proportion, and pure water is added as needed, and they are comprehensively used for low-carbon POY and regenerated POY.

[0026] A regeneration process of a nylon spinning oil recycling treatment device can recycle the spinning oil, reduce the pressure of the enterprise's spinning oil treatment, process the oil in the nylon enterprise's suction system, and after treatment, it can be recycled for spinning to produce low-carbon POY and recycled POY, which can not only meet the production needs of low-carbon POY and recycled POY, but also ensure that the recycled oil will almost completely evaporate when passing through the hot roller during the subsequent texturing of DTY, and it can also ensure that the product quality of DTY is not affected. The recycling of spinning oil responds to the call of the national circular economy, increases the recycling rate of resources, and effectively reduces the pressure of spinning oil treatment in enterprises, reducing the inventory pressure and environmental pressure of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of a treatment device for recycling nylon spinning oil according to the present invention.

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] 1-oil agent standing tank, 2-first filter, 3-sterilizer preparation tank, 4-purification tank, 41-paddle stirrer, 42-steam input pipe, 5-water cooling jacket, 6-regenerated oil agent collection tank, 7-second filter, 8-oil agent pump, 9-condensate recovery tank. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0032] See also Figure 1 The invention provides a technical solution: a treatment device for recycling nylon spinning oil, comprising an oil static tank 1, a sterilizing agent configuration tank 3, a purification tank 4, a regenerated oil collecting tank 6 and a condensate recovery tank 9; the oil static tank 1 is connected to the purification tank 4 through a first pipeline, and a filter screen with a mesh number of 100 is arranged at the injection port of the oil static tank 1, and a first filter 2 is arranged on the first pipeline, and the mesh number of the first filter 2 is 720 mesh; the sterilizing agent configuration tank 3 is connected to the purification tank 4 through a second pipeline; the purification tank 4 is connected to the regenerated oil collecting tank 6 through a third pipeline, and an oil pump 8 and a second filter 7 are arranged on the third pipeline in sequence, and the mesh number of the second filter 7 is 960 mesh; the purification tank 4 is connected to the condensate recovery tank 9 through a fourth pipeline, and a water-cooling jacket 5 is arranged on the fourth pipeline; a paddle stirrer 41 is installed on the purification tank 4, a steam input pipe 42 is connected to the purification tank 4 and a steam control valve is installed, and the steam input pipe is connected to an external steam supply device.

[0033] The spinning oil is poured into the oil-settling tank 1 through the feeding port with a filter screen, and then added to the purification tank 4 through the first filter 2. The oil is purified by heating and stirring in the purification tank 4, and the evaporated water vapor and oil are condensed in the condensate recovery tank 9 through the water-cooling jacket for standby use. When the temperature of the purification tank 4 drops to a suitable temperature, the sterilizing agent with a prepared concentration is added to the pure tank 4 through the sterilizing agent configuration tank 3. After being stirred evenly, the regenerated oil enters the regenerated oil collection tank 6 through the oil pump 8 and the second filter 7 for standby use. In the subsequent spinning, pure water is added as needed according to a certain ratio based on the measured regenerated oil and condensate concentrations, and is comprehensively utilized in spinning production.

[0034] Based on the above-mentioned treatment device for recycling nylon spinning oil, a related treatment process is provided:

[0035] A regeneration process of a treatment device for recycling nylon spinning oil, comprising the following processing steps:

[0036] Step 1: Add the collected spinning waste oil agent to the oil agent static tank 1 through a filter screen with a precision of 100 meshes, and let it stand in the oil agent static tank 1 for 2 hours, so that part of the solid sediment passing through the filter screen is settled at the bottom of the tank;

[0037] Step 2: The waste spinning oil passes through the first filter 2 and enters the purification tank 4 through the potential difference, and the addition is stopped when the liquid level accounts for 70% of the total liquid level, and the paddle stirrer 41 is turned on for stirring, and the initial concentration of the spinning oil is measured by sampling through the sampling tube;

[0038] Step 3: Open the steam control valve and heat the spinning oil with steam. The heating temperature range of the spinning oil is controlled to be 90°C-100°C and the heating time is 4 hours. The heated steam is condensed through the water-cooled jacket 5 and collected in the condensate recovery tank 9. The remaining regenerated oil is placed in the purification tank 4 for cooling treatment.

[0039] Step 4: prepare the bactericide and surfactant through the bactericide preparation tank 3, the bactericide prepared in the bactericide preparation tank 3 is a dynamically proportioned mixture of isothiazolinone-bronopol-ethylene glycol with a concentration of 5%, and the surfactant prepared in the bactericide preparation tank 3 is polyoxyethylene laurate and dodecyl diethanolamine; add the bactericide and surfactant solution according to the actual liquid after the temperature in the purification tank 4 is cooled to 40°C, and after the bactericide solution and the surfactant solution are added to the purification tank 4, the bactericide concentration of the regenerated oil is 500-700ppm;

[0040] Step 5: After the regenerated oil and the sterilizing agent are fully stirred, the oil pump 8 is used to increase the pressure, and then the oil is filtered through the second filter 7 and enters the regenerated oil collection tank 6;

[0041] Step 6: When there is a demand for spinning low-carbon POY and recycled POY, the recycled oil and condensate after concentration testing and analysis will be added with pure water as needed to prepare special oil for low-carbon POY and recycled POY production.

[0042] In addition, the dynamic ratio of isothiazolinone-bronopol-ethylene glycol (see Table 1: Dynamic ratio formula of recycled oil disinfectant) is used to mix the disinfectant, and the dynamic ratio is changed once a month to prevent the long-term use of a single disinfectant from causing bacteria to adapt, which can provide better corrosion protection for the recycled oil agent and ensure that the recycled oil can be stored for a certain period of time. Polyoxyethylene laurate and dodecyl diethanolamine are used as surfactants to ensure that the applied spinning products maintain good physical properties.

[0043] Table 1: Dynamic ratio formula of recycled oil deodorant

[0044] Components Dynamic ratio 1 Dynamic ratio 2 Isothiazolinone 6％ 8％ Bronopol 10％ 20％ Ethylene glycol 84％ 72％

[0045] The bactericidal agent and the surfactant are prepared through the preparation tank 3. The bactericidal agent is a customized dynamically proportioned mixture of isothiazolinone-bronopol-ethylene glycol, and the surfactant is polyoxyethylene laurate and dodecyl diethanolamine.

[0046] After each component is processed according to a specific process (see the following implementation cases for details), it is pressurized by an oil pump 8 and then filtered into a regenerated oil collection tank 6. The effective concentration of the regenerated oil obtained by this process is about 85%-90%. When there is a demand for the use of the regenerated POY, the spinning is configured as required to produce a special oil for the production of regenerated POY.

[0047] Embodiment 1:

[0048] After the regenerated oil is allowed to stand and cool in the purification tank, maintain the stirring temperature at 25-30°C and stir for 30 minutes. Then, add nonionic surfactant, anionic surfactant, bactericide and pure water according to the formula. After the configuration is completed, the content of effective components in the regenerated oil is 90%, of which the bactericide content is 500ppm. Then, raise the temperature to 30-40°C and stir for 30 minutes. After passing the analysis and inspection, it can be used for spinning production.

[0049] The active ingredients in the recycled oil formula are composed of the following components and contents:

[0050]

[0051] Embodiment 2:

[0052] After the regenerated oil is allowed to stand and cool in the purification tank, the stirring temperature is maintained at 25-30°C and stirred for 30 minutes. Non-ionic surfactants, anionic surfactants, bactericides and pure water are then added according to the formula. The content of effective components in the regenerated oil after configuration is 88%, of which the bactericide content is 450ppm. The temperature is then raised to 30-40°C and stirred for 30 minutes. After passing the analysis and inspection, it can be used for spinning production.

[0053] The active ingredients in the recycled oil formula are composed of the following components and contents:

[0054]

[0055] Embodiment 3:

[0056] After the regenerated oil is allowed to stand and cool in the purification tank, the stirring temperature is maintained at 25-30°C and stirred for 30 minutes. Non-ionic surfactants, anionic surfactants, bactericides and pure water are then added according to the formula. The effective component content of the regenerated oil after configuration is 85%, of which the bactericide content is 480ppm. The temperature is then raised to 30-40°C and stirred for 30 minutes. After passing the analysis and inspection, it can be used for spinning production.

[0057] The active ingredients in the recycled oil formula are composed of the following components and contents:

[0058]

[0059] Embodiment 4:

[0060] After the regenerated oil is allowed to stand and cool in the purification tank, maintain the stirring temperature at 25-30°C and stir for 30 minutes. Then, add non-ionic surfactant, anionic surfactant, bactericide and pure water according to the formula. After the configuration is completed, the content of effective components in the regenerated oil is 80%, of which the bactericide content is 400ppm. Then, raise the temperature to 30-40°C and stir for 30 minutes. After passing the analysis and inspection, it can be used for spinning production.

[0061] The active ingredients in the recycled oil formula are composed of the following components and contents:

[0062]

[0063] The recycled oils used in implementation cases 1-4 were compared with the original oil Takemoto F-5178 used in the comparative case, as shown in Table 2.

[0064] Table 2: Comparison of recycled oil and virgin oil Takemoto F-5178

[0065] Inspection items Implementation Case 1 Implementation Case 2 Implementation Case 3 Implementation Case 4 Comparative Cases Appearance Light yellow transparent Light yellow transparent Light yellow transparent Light yellow transparent Light yellow transparent Effective concentration 90％ 88％ 85％ 80％ 90％ PH 7 7 7 7 7 density 0.9398 0.9462 0.9472 0.9488 0.9402

[0066] Then, the recycled oils of implementation cases 1-4 and the original oils of the comparative cases were blended to an emulsion concentration of 5%-7% by an emulsion blending method, and applied to the production of recycled POY (85D / 68F) by an oil nozzle oiling method. The performance test results of each case are listed in Table 3.

[0067] Table 3: Performance test results of POY (85D / 68F) spun in each case

[0068]

[0069] It can be seen that the POY test results of implementation cases 1-3 using recycled oil and the comparison case using virgin oil are similar, while the breaking strength, elongation at break and oil content of implementation case 4 are all lower, and the unevenness of the strands is higher. The overall test results are quite different from those of virgin oil.

[0070] Furthermore, we carried out DTY texturing on POY using recycled oil in implementation cases 1-3 and virgin oil in comparison case, and listed the results of relevant physical property test indicators in Table 4.

[0071] Table 4: Results of physical property test of DTY (70D / 68F) spun in each case

[0072]

[0073]

[0074] It can be seen that the physical property test results of DTY products produced by POY stretching produced by implementation cases 1-3 using recycled oil and comparison cases using virgin oil are similar, and the product quality is similar.

[0075] In summary, the 85%-90% effective concentration of recycled oil produced by this set of regeneration preparation process has normal product quality when producing recycled POY, and the quality of DTY after POY is textured is comparable to that of DTY produced by POY produced using virgin oil.

[0076] In the description of the invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0077] In the invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the invention according to the specific circumstances.

[0078] Although embodiments of the invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A regeneration process for a nylon spinning oil treatment device for recycling, characterized in that: The processing steps include: Step 1: adding the collected spinning waste oil agent to the oil agent static tank (1) through a filter screen with a precision of 100 meshes, and leaving it in the oil agent static tank (1) for 2 hours, so that part of the solid sediment passing through the filter screen is settled at the bottom of the tank; Step 2: The waste spinning oil passes through the first filter (2) through potential difference and then enters the purification tank (4). When the liquid level accounts for 70% of the total liquid level, the addition is stopped, and the paddle stirrer (41) is turned on for stirring. The initial concentration of the spinning oil is measured by sampling through the sampling tube; Step 3: Open the steam control valve and heat the spinning oil with steam; the heated steam is condensed through the water-cooled jacket (5) and collected in the condensate recovery tank (9); the remaining regenerated oil is placed in the purification tank (4) for cooling treatment; Step 4: Prepare the bactericide and surfactant in the bactericide preparation tank (3), and add the bactericide solution and surfactant solution according to the actual liquid after the temperature in the purification tank (4) drops to 40°C; Step 5: After the regenerated oil and the sterilizing agent are fully stirred, the oil pump (8) is used to increase the pressure, and then the oil is filtered through the second filter (7) before entering the regenerated oil collection tank (6); Step 6: When there is a demand for spinning low-carbon POY and recycled POY, the recycled oil and condensate after concentration testing and analysis will be added with pure water as needed to prepare special oil for low-carbon POY and recycled POY production.

2. The regeneration process of a nylon spinning oil recycling treatment device according to claim 1, characterized in that: In step three, the steam-heated spinning oil is heated to a temperature range of 90° C.-100° C. and the heating time is 4 hours.

3. The regeneration process of the treatment device for recycling nylon spinning oil according to claim 1 is characterized in that: In step 4, the bactericidal agent configured in the bactericidal agent configuration tank is a dynamically proportioned mixture of isothiazolinone-bronopol-ethylene glycol with a concentration of 5%; the surfactant configured in the bactericidal agent configuration tank is polyoxyethylene laurate and dodecyl diethanolamine.

4. The regeneration process of a nylon spinning oil recycling treatment device according to claim 1, characterized in that: In step 4, after adding the bactericide solution into the purification tank, the bactericide concentration of the regenerated oil is 500-700 ppm.

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