Search

CN-122006614-A - Sorting, alcoholysis, purifying, continuous polycondensation and multi-product discharging integrated large-scale continuous device and method for closed-loop recovery of polyester textile

CN122006614ACN 122006614 ACN122006614 ACN 122006614ACN-122006614-A

Abstract

The invention discloses a sorting, alcoholysis, purification, continuous polycondensation and multi-product discharging integrated large-scale continuous device and method for closed-loop recovery of polyester textiles, and belongs to the technical field of chemical recovery of polyester and manufacturing of regenerated fibers. The device is used for carrying out closed loop linkage on modules such as intelligent sorting and pretreatment, continuous material distribution and feeding, continuous alcoholysis train, on-line impurity removal and decolorization, continuous refocusing and isobaric diversion, multi-product execution, energy and public engineering center and the like through a central control and scheduling system. The device realizes the closed-loop linkage of intelligent sorting and storage, continuous alcoholysis, on-line impurity removal and evaporation to adsorption coupling, continuous repolymerization and isobaric multi-product diversion under the same central control system, and is matched with EG/solvent closed-loop recovery and heat integration network and N+1 redundancy, and the device realizes hundred-ton scale, low energy consumption and stable quality, and is suitable for continuous production of textile to textile closed-loop recovery.

Inventors

  • HE ZEYI
  • Ye Xiaozhe

Assignees

  • 杭州化循科技有限公司

Dates

Publication Date
20260512
Application Date
20260120

Claims (10)

  1. 1. Sorting, alcoholysis, purification, continuous polycondensation and multi-product discharging integrated large-scale continuous device for closed-loop recovery of polyester textile, and is characterized by comprising: The intelligent sorting and preprocessing module (A) is used for shunting waste polyester textiles according to materials and colors and forming raw materials with alcoholysis adaptive particle sizes, and comprises an NIR/visible light+AI sorting unit (A110), a removing accessory and cleaning unit (A120), a crushing and grading unit (A130) and a buffering and storage silo matrix (A140) which is connected with 6 bins in parallel or more; the continuous material distributing and feeding module (B) comprises a weightless feeder array (B210), a preheating/pre-swelling device (B220) and a material main line (B230), wherein the working temperature of the preheating/pre-swelling device (B220) is 80-120 ℃; the continuous alcoholysis train (C) comprises a CSTR series-connection and static mixer (C310), an online quality control unit (C330) and an EG closed-circuit recovery unit (C340), wherein the alcoholysis temperature of the CSTR series-connection and static mixer (C310) is 190-220 ℃, the EG closed-circuit recovery unit (C340) adopts a falling film/thin film evaporation and MVR/heat pump technology, and the solvent loss is less than or equal to 2wt%; The on-line impurity removal and decoloration module (D) comprises a hot filtration and fine filtration frame (D410), an evaporation-adsorption coupler (D420) and a color quality driven filtration circulation system (D430), wherein the filtration precision of the hot filtration and fine filtration frame (D410) can be switched between 20-40 mu m and 5-10 mu m, and an adsorption cavity of the evaporation-adsorption coupler (D420) is divided into an A/B two area and can be regenerated on line; The continuous repolymerization and isobaric flow distribution module (E) comprises a pre-esterification section (E510), a main polycondensation section (E520), an online IV/end group/chromaticity soft measurement unit (E530), an isobaric distribution assembly (E540) and a bypass cleaning/degradation tank (E550), wherein the vacuum degree of the pre-esterification section (E510) and the main polycondensation section (E520) is less than or equal to 150Pa, and the isobaric distribution assembly (E540) ensures that the pressure difference of inlets of multiple product branches is less than or equal to +/-0.01 MPa; A multi-product execution module (F) comprising a slicing wire (F610), a filament spun wire (F620) and a staple/nonwoven wire (F630); An energy and utility center (G) comprising an EG vapor/solvent recovery unit (G710), a heat integration network (G720), and a cooling and vacuum system (G730), the cooling and vacuum system (G730) employing an n+1 redundancy design; the central control and scheduling system (H) is used for converging online quality data and generating device-level control instructions through a rule engine/small model to implement multivariable predictive control and quality-energy consumption tracing; wherein the central control and scheduling system (H) enables each module which is sorted to be discharged from multiple products to operate in a linkage mode in a closed-loop control mode under the condition of no stop.
  2. 2. A continuous process for closed loop recovery of polyester textile comprising the steps of: S1, intelligent sorting and pretreatment, namely sorting, removing accessories, cleaning, crushing and grading waste polyester textiles through an intelligent sorting and pretreatment module (A) to form an alcoholysis adaptive particle size raw material with the size of 5-20 mm; S2, accurately proportioning raw materials through a weightless feeder array (B210) of a continuous material distributing and feeding module (B), and conveying the raw materials to a continuous alcoholysis train (C) after pre-heating/pre-swelling device (B220) for pre-soaking and swelling; s3, continuous alcoholysis, online quality control and EG closed-loop recovery, EG alcoholysis reaction is carried out at 190-220 ℃, the quality of a product is detected in real time by an online quality control unit (C330), and EG solvent is recovered by a closed-loop recovery unit; S4, performing gradient filtration and evaporation-adsorption coupling impurity removal and decoloration through an on-line impurity removal and decoloration module (D), and outputting a control instruction by a rule engine to drive a filtration circulation system (D430) to dynamically adjust; S5, continuous repolymerization and isobaric multi-product diversion switching, obtaining a product with the intrinsic viscosity of 0.64-0.80dL/g through pre-esterification and main polycondensation, wherein an isobaric distribution assembly (E540) realizes multi-product diversion under the condition that the inlet pressure difference is less than or equal to +/-0.01 MPa, and transitional materials are temporarily stored through a bypass cleaning/degradation tank (E550); S6, multi-product forming and post-treatment, and producing a slice, filament or staple fiber/non-woven fabric product through a corresponding process of a multi-product execution module (F); s7, EG/solvent closed-loop recovery and heat integration, and realizing solvent recovery and energy efficient utilization through an energy and public engineering center (G); And S8, full-chain tracing and KPI feedback self-calibration, wherein a central control and scheduling system (H) records full-chain data, and process parameter self-calibration is carried out according to the KPI of the finished product.
  3. 3. The large-scale integrated continuous device for sorting, alcoholysis, purification, continuous polycondensation and multi-product discharging for closed loop recovery of polyester textiles according to claim 1, wherein the NIR/visible light+AI sorting unit (A110) of the intelligent sorting and preprocessing module (A) can accurately split the materials (PET/blending/deep color/spandex) and colors, and the breaking particle size of the breaking and grading unit (A130) is 5-20mm.
  4. 4. The large-scale continuous device for sorting, alcoholysis, purification, continuous polycondensation and multi-product discharging for closed loop recovery of polyester textiles according to claim 1, wherein the continuous alcoholysis train (C) further comprises a recoverable catalyst/fixed bed (C320) for reducing metal residues in alcoholysis products, and the online quality control unit (C330) integrates Lab x/UV-Vis/NIR spectral detection, turbidity/particle spectral analysis and Zn/Mn/Co/Sb metal ion rapid detection functions.
  5. 5. The large-scale continuous device for sorting, alcoholysis, purification, continuous polycondensation and multi-product discharging integration for closed loop recovery of polyester textiles according to claim 1, wherein the filtration and circulation system (D430) of the online impurity removal and decoloration module (D) is dynamically adjusted according to Topo, bypass, regen control instructions output by a rule engine, and the evaporation-adsorption coupler (D420) adopts film/oscillation film evaporation to work cooperatively with the circumferential microcirculation adsorption cavity.
  6. 6. The large-scale continuous device integrating sorting, alcoholysis, purification, continuous polycondensation and multi-product discharging for closed loop recovery of polyester textiles according to claim 1, wherein the isobaric distribution assembly (E540) of the continuous repolymerization and isobaric diversion module (E) comprises an annular isobaric manifold, an intelligent three-way valve group with response time less than or equal to 0.5s and a branch accumulator, and the bypass cleaning/degradation tank (E550) is used for temporarily storing transition materials in the product switching process.
  7. 7. The large-scale continuous device for sorting, alcoholysis, purification, continuous polycondensation and multi-product discharging integration for closed loop recovery of polyester textiles according to claim 1, wherein the filament straight spinning line (F620) of the multi-product execution module (F) is equipped with a fine filtration unit of less than or equal to 10 μm, the staple/non-woven line (F630) adopts a melt-blowing/spunbonding process, and the slicing line (F610) produces polyester slices through a water-cooling bracing, pelletizing and centrifugal drying process.
  8. 8. The large-scale continuous device for sorting, alcoholysis, purification, continuous polycondensation and multi-product discharging integration for closed loop recovery of polyester textiles according to claim 1, wherein the heat integration network (G720) of the energy and public works center (G) is based on a Pinch design method, heat exchange matching is carried out on condensation/evaporation latent heat and reaction exothermic heat/endothermic heat, the EG steam/solvent recovery unit (G710) adopts a multi-effect evaporation+mvr technology, and tail gas is subjected to condensation+activated carbon polishing treatment.
  9. 9. The large-scale continuous device integrating sorting, alcoholysis, purification, continuous polycondensation and multi-product discharging for closed loop recovery of polyester textiles according to claim 1, wherein the central control and scheduling system (H) comprises an online multi-spectrum quality control data aggregation unit (H810), a rule engine/small model unit (H820), an MPC/APC unit (H830) and a traceability and reporting unit (H840), and can realize the recording and traceability of all-chain batch, quality, energy consumption and unit consumption data.
  10. 10. The continuous process for closed loop recovery of polyester textile according to claim 2, wherein the treatment scale of the process is not less than 100t/d, preferably 200-500t/d, the steady state fluctuation of the chromatic aberration delta E of the fiber-grade product is not more than 0.5, the filament breakage rate is not less than 20% lower than the conventional process, and the quality of the multi-product switching bad section is not more than 200kg, preferably not more than 120kg.

Description

Sorting, alcoholysis, purifying, continuous polycondensation and multi-product discharging integrated large-scale continuous device and method for closed-loop recovery of polyester textile Technical Field The invention relates to the technical field of polyester chemical recovery and regenerated fiber manufacturing, in particular to a large-scale integrated continuous device and a method for sorting, alcoholysis, purification, continuous polycondensation and multi-product discharging for closed-loop recovery of polyester textiles. Background With the rapid development of the global textile industry, the consumption of polyester textiles continues to increase, and the number of waste polyester textiles generated therewith is also increasing. The recycling of the waste polyester textiles not only can relieve the problem of resource shortage, but also can reduce environmental pollution, and has important economic value and environmental protection significance. At present, most of the recovery processes of waste polyester textiles are distributed, and the processes are characterized in that the sorting link is outsourced treatment, the alcoholysis process adopts intermittent operation, the decoloring purification relies on batch recrystallization process, and the re-polymerization section and the spinning granulation link are distributed. The distributed process has the technical defects that firstly, the material turnover time is long due to independent operation of each link, the intermediate stock is seriously backlogged, the production period and the cost are increased, secondly, the process parameters are difficult to accurately control due to intermittent operation and branching arrangement, the quality fluctuation of products among batches is large, the quality requirement of high-end regenerated fibers cannot be met, thirdly, the distributed process lacks systematic energy and solvent recovery design, the unit energy consumption is high, the solvent loss is large, the resource waste and the environmental pollution are caused, and finally, each unit is only optimized independently (such as only the adsorption process is improved or the evaporation efficiency is improved), so that the core problem of end-to-end stable production and cost control is difficult to fundamentally solve. Most of the prior recovery is distributed, namely sorting outsourcing, intermittent alcoholysis, batch decoloring recrystallization, repolymerization section and spinning grain-cutting branching arrangement, which results in long turnover time, high energy consumption, large batch-to-batch fluctuation and difficult scale. Unit optimization (e.g., improved adsorption only, lifting evaporation only) is difficult to solve the "end-to-end stability and cost" problem. The system scheme of integrating front-end sorting, middle-section chemical depolymerization and purification, rear-section continuous repolymerization and multi-product diversion through a unified scheduling and energy network into a set of large-scale continuous device is lacking in a factory level. Therefore, developing an integrated large-scale continuous device capable of realizing the coordinated linkage of all links, the efficient recovery of energy and solvents and the stable output of multiple products becomes a technical problem to be solved in the field. Disclosure of Invention The present invention has been made in view of the above-described problems occurring in the prior art. Therefore, the invention provides a large-scale integrated continuous device for sorting, alcoholysis, purification, continuous polycondensation and multi-product discharging, which is oriented to closed-loop recovery of polyester textiles, and comprises the following components: The intelligent sorting and preprocessing module (A) is used for shunting waste polyester textiles according to materials and colors and forming raw materials with alcoholysis adaptive particle sizes, and comprises an NIR/visible light+AI sorting unit (A110), a removing accessory and cleaning unit (A120), a crushing and grading unit (A130) and a buffering and storage silo matrix (A140) which is connected with 6 bins in parallel or more; the continuous material distributing and feeding module (B) comprises a weightless feeder array (B210), a preheating/pre-swelling device (B220) and a material main line (B230), wherein the working temperature of the preheating/pre-swelling device (B220) is 80-120 ℃; the continuous alcoholysis train (C) comprises a CSTR series-connection and static mixer (C310), an online quality control unit (C330) and an EG closed-circuit recovery unit (C340), wherein the alcoholysis temperature of the CSTR series-connection and static mixer (C310) is 190-220 ℃, the EG closed-circuit recovery unit (C340) adopts a falling film/thin film evaporation and MVR/heat pump technology, and the solvent loss is less than or equal to 2wt%; The on-line impurity removal and decoloration module (D) compr