1. technical name

Ionic liquids synergistically catalyzed waste polyester recycling technology

2. technology type

Full life cycle resource conservation and recycling technology

3. scope of application

It belongs to the chemical engineering industry and is limited to plastic recycling technology.

4. Brief description of technology

In view of the common problems in the industry such as low chemical and chemical alcoholysis efficiency, high temperature, long reaction time, high recycling cost, and difficulty in reaching the chroma standards during reuse, a functionalized ionic liquid with anionic and cationic synergistic effect is used as a catalyst to activate PET polyester ester bonds and alcoholysis solvent hydroxyl groups to improve catalytic efficiency. The catalytic mechanism and control mechanism of cationic and cationic synergistic alcoholysis of PET polyester were studied to obtain high yield and high purity alcoholysis monomers. Alcoholytic monomers can be subsequently utilized as platform compounds to prepare recycled PET chips and realize high-value, short-process recycling and recycling of waste PET polyester.

5. technical information

The intrinsic viscosity of recycled PET of this technical product is ≥0.67, the L value is ≥80, the b value is ≤3.0, the average molecular weight is ≥20000, and the thermal stability is equivalent to that of virgin PET.

6. Commercial applications

In 2015, this technology cooperated with Aerospace Resources Recycling Technology Co., Ltd. in Tianjin to establish a thousand-ton demonstration device for catalytic degradation of PET based on ionic liquids, with zero emissions of exhaust gas and wastewater and less than 1%. Good environmental benefits have been achieved. Foreign countries have signed a $100 cooperation contract with Green Lizard Technologies Ltd in the UK to jointly promote the construction of 10,000-ton commercial units in the UK. Currently, the ton-level experimental verification of waste PET raw materials in the UK has been completed, and the 10,000-ton process package is underway. design.

7. Help/support you hope to receive during the technology transfer process

no

8. equipment investment

The main promotion and construction project of this technology is a 10,000-ton industrial device. Taking the new construction project of recycled PET products of 10,000 tons/year as an example, the project mainly includes the following main bodies and supporting systems: raw material storage and feeding system: mainly including raw material tanks, medium storage tanks, etc., screw feeders, and transfer conveyors are used for the storage and transportation of raw materials. Degradation reaction system: It mainly includes diaphragm pump, oil-free silent air compressor, oil bath tank, and oil bath heating reaction kettle, which are used for the degradation reaction of raw materials. Separation system: It mainly includes constant temperature tank, cooling kettle, crystallization kettle, dissolution kettle, plate and frame filter, and filter tank, which is mainly used for crystallization and separation of products. Purification system: It mainly includes constant temperature tank, cooling kettle, crystallization kettle, dissolution kettle, decoloring tower, plate and frame filter, and filter tank, which are used for adsorption, decoloring and crystallization separation of products. Polymerization system: It mainly includes pressure gauge, mechanical pump, oil bath, and polymerization reactor, which is used for monomer polymerization to prepare recycled PET. Control system: mainly includes DCS system, thermocouple, insulation belt, pneumatic valve, safety valve, ball valve, check valve, filter, needle valve, other connecting parts (pressure gauge connector, three-way, two-way, reducer, plug), instrument, etc., used for system control. Power system: It mainly includes instrument components, frequency converters, transformers, wires and cables, electrical control cabinets, and 250KVA power distribution projects for power supply. Metering system: This system mainly includes dual rotary feeders, double tube spiral electronic scales, etc., which are mainly used for the measurement of raw materials, products and catalysts. The one-time overall investment of the above devices is about 11.5 million yuan.

9. Annual operation and maintenance fee

Taking a project with an annual output of 10,000 tons of recycled PET products as an example, each ton of recycled PET products requires about 1000kg of PET raw materials, 366.74 kg of ethylene glycol, 8.28 kg of solvent, 5.15 kg of catalyst, 11810kg of steam, and 24480kg of recycled water. The PET raw material cost per ton of recycled PET is 1,544.96 yuan, ethylene glycol is 1,312.93 yuan, solvent is 12.59 yuan, catalyst is 66.95 yuan, steam is 2,243.90 yuan, and recycled water is 85.68 yuan. Electricity is 193.74 yuan, three wastes treatment is 1,352.43 yuan, packaging fee is 60.00 yuan, transportation fee is 300.00 yuan, labor is 300.00 yuan, equipment depreciation is 48.00 yuan, and management fee is 52.00 yuan. Total cost per ton: 7,574.18 yuan.

10. investment recovery period

Take a project with an annual output of 10,000 tons of recycled PET as an example: total investment: 11.5 million yuan, annual output value of recycled PET: 8000 yuan/ton × 10,000 tons = 80 million yuan, annual production and operating cost per ton of recycled PET: 7574.18 yuan/ton × 10,000 tons = 75.7418 million yuan, annual profit: 8000-7574.18= 4.2582 million yuan, static investment payback period: 1150÷425.82=2.7 years.

11. added benefit

(1) Economic benefits: Through technical and economic analysis, the processing cost of recycled PET is 7000 yuan/ton, while the price of the product is 12,000 - 15,000 yuan/ton. The annual profit of the 10,000-ton project is 50 - 80 million yuan, and the profit is considerable. The patented technology obtained through this project is expected to be further transferred and transformed to society and the market, forming a healthy development from basic research to applied research and then to other developing countries, thus producing huge economic value and social benefits. (2) Environmental benefits: After PET is discarded, it is generally disposed of through landfill, incineration, etc., causing serious environmental pollution. After recycling, waste and solid emissions can be reduced by 10,000 tons/year and fossil resource consumption can be reduced by 15,000 tons/year. (3) Political diplomacy: This technology can be transformed in most countries along the Belt and Road Initiative and can establish China's image and advantages in countries along the Belt and Road Initiative. Scientific and technological cooperation with Belt and Road countries in the field of recycling waste resources is an important part of external work and an important way to enhance the country's scientific and technological innovation capabilities. It has a fundamental, forward-looking and strategic role in my country's implementation of innovation-driven development strategy, and is also One of the important measures to implement the diplomatic commitments of national leaders. (4) Talent training and international influence: Through the implementation of this project, we can also gather and train an excellent research team, aim at continuing exploration in the field of utilization of waste resources, and achieve scientific and technological achievements through strengthening characteristics, collaborative cooperation, and closely following goals., enhance international influence and competitiveness

12. comprehensive benefits

Ionic liquid-catalyzed waste polyester recycling technology aims to reduce serious pollution to the environment caused by the accumulation of large amounts of waste polyester. At the same time, on the one hand, using waste polyester as raw material to catalyze alcoholysis into monomers or oligomers, so that it can be further repolymerized into new products and enter a new cycle process, which is a typical representative of resource and energy reuse; On the other hand, using waste polyester as raw material can reduce the process of directly polymerizing monomers from petroleum resources into products, which is a necessary way to save resources and energy. Compared with the raw material technology, this technology is comparable in process technology and economy. The current price of recycled PET products is 1.5% of the price of raw PET.~2 times, with obvious economic benefits. For example, taking PET degradable monomer (terephthalate) to prepare high-value products such as polyurethane adhesives as an example, the product cost can be reduced by 5% by reducing energy consumption and yield in intermediate stages of synthesis. On the premise of recycling resources and energy, this technology has greater competitiveness and social benefits.

13. Level of impact of obstacles on technology transfer

no

14. technology maturity

The ionic liquid catalyzed PET alcoholysis technology developed by the Institute of Process Engineering, China Academy of Sciences has high technical maturity and is a complete set of process technology with independent intellectual property rights. It has achieved the establishment and stable operation of a thousand-ton demonstration device in China, and has signed a strategic cooperation agreement with Sichuan Dongcai Technology Group Co., Ltd., and plans to jointly promote the construction of a 10,000-ton PET recycling industrial demonstration. At present, the pilot degradation and polymerization experiments have been completed, and the products have all obtained qualified indicators and met the textile performance requirements of subsequent products such as short filaments and filaments. Foreign countries have signed a memorandum of cooperation with Green Lizard Technologies Ltd in the UK and signed a $100 contract to jointly promote the design of 10,000-ton process packages and the construction of commercial devices in the UK. Currently, the ton-level experimental verification of waste PET raw materials in the UK has been completed., and a 10,000-ton process package design is underway.

15. technical applicability

The applicable fields of this technology are the waste plastic recycling industry and the polyester synthesis industry. It is suitable for chemical recycling and reuse technologies related to waste PET, and has no limitations such as region, scale, and environmental conditions. The alcoholysis solvent can be monohydric alcohol or dihydric alcohol. The required raw materials are suitable for various materials of pure PET, including bottle slices, packaging materials, film materials and polyester fibers, etc., as well as some mixed PET materials, such as polyester and cotton blended fibers and garments, etc. These raw materials are sufficient to meet the needs of recycling. Cooperation with PET polyester synthesis companies will greatly reduce production costs. In addition, employees need to be trained in safety and operation to make it easy to use and maintain.

16. technical stability

A thousand-ton demonstration device for the technology of catalytic alcoholysis of waste polyester by ionic liquids has been established. The device has achieved stable operation, and the yield and quality of alcoholysis products are stable. During the operation, the reactor of the device is a closed system, and the entire process uses atmospheric pressure equipment, the reaction conditions are atmospheric pressure, and the equipment is a pressure-resistant system. It can be seen that this technology is less sensitive to interference such as environment and technical parameters. Therefore, the 10,000-ton device built based on this technology can maintain stability during engineering operation. 10,000-ton equipment can be used stably for more than 10 years under normal production and maintenance conditions.

17. technical safety

This technical achievement uses ionic liquids with good thermal stability, low vapor pressure, non-flammable, and low corrosiveness as catalysts, and high-boiling-point ethylene glycol as alcoholysis solvent. It operates under normal pressure conditions without secondary pollution, inflammable and explosive risks of environmental and safety accidents such as leaks of highly toxic substances. The application of waste PET, which is produced in large quantities every year, as raw material, has no upstream resource limitations and few requirements for supporting facilities. Ordinary depolymerization and polymerization reactors can meet the requirements. Moreover, this technology is a policy strongly supported and supported by the state, and has high market acceptance and no market and policy risks.

18. Barriers to technology transfer and promotion

no

19. intellectual property transfer

The applicant has all intellectual property rights involved in the implementation of the project. It has applied for 27 patents on related technologies and authorized 12. Some of the core patents are as follows: 1. Method for depolymerization of ethylene terephthalate by alcohol by CoCl42-/NiCl42-type ionic liquids, 201110004611.X.  2. Method for alcohol depolymerization of ethylene terephthalate catalyzed by first transition system metal ionic liquids, 201110090618.8.  3. Method for rapid and efficient catalysis of alcohol depolymerization of ethylene terephthalate by urea-based eutectic ionic liquids, 201410612174.3. 4. Method for alcohol depolymerization of ethylene terephthalate catalyzed by metal acetate ionic liquids, 201110198356.7.  5. A method for efficiently catalyzing alcohol depolymerization of ethylene terephthalate with a multi-component catalyst, 201110302813.2.  6. A method for catalytic alcohol depolymerization of ethylene terephthalate, 201110139360.6.  7. A method for catalytic degradation of polyethylene terephthalate by polymetallic oxygen clusters, 201410166733.2.  8. A chemical recycling and recycling system for waste PET materials, 201520908480.1.  9. A method for preparing paraxylene from hydrodegradation of waste PET. 201610205768.1 The technology owner is the Institute of Process Engineering of China Academy of Sciences, which is a public research unit. The owner has a strong willingness to transfer, and the technical property rights transfer mechanism and policy channels are smooth.