Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of solid base catalyst for alcoholysis of PET

A solid base catalyst, alcoholysis technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of high calcination temperature, low BHET yield, long reaction time, etc. High purity, high product yield, and the effect of reducing the introduction of impurities

Active Publication Date: 2022-08-05
NANJING UNIV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The team of A.E.ElMetwally synthesized (Mg-Zn)-Al-LDH by co-precipitation method. At 196°C, the reaction was 3h. The catalyst completely converted PET, and the BHET yield reached 75% (Journal of Molecular Liquids, 2016, 214: 1-6), but the alcoholysis reaction still has problems such as long reaction time and low BHET yield
Chen Feifei's team calcined magnesium aluminum hydrotalcite at different temperatures to obtain a composite metal oxide catalyst. At 196°C, the reaction was carried out for 50 minutes. The catalyst catalyzed the alcoholysis of PET, and the BHET yield reached 81% (Industrial & Engineering Chemistry Research, 2012, 52:565 -571), but the catalyst requires a high calcination temperature (500°C), and the BHET yield is low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of solid base catalyst for alcoholysis of PET
  • Preparation method of solid base catalyst for alcoholysis of PET
  • Preparation method of solid base catalyst for alcoholysis of PET

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This example illustrates the preparation method of the magnesium-nickel double metal oxide solid base catalyst (magnesium-nickel molar ratio=20 / 50 / 75 / 100 / 150:1).

[0034] First prepare a mixed aqueous solution containing magnesium chloride, nickel chloride and β-alanine. The concentration of magnesium chloride in the solution is 0.5mol / L, the concentration of β-alanine is 0.1mol / L, and the concentration of nickel chloride is different Magnesium-nickel molar ratio is set, respectively 0.025mol / L (magnesium-nickel molar ratio=20:1), 0.01mol / L (magnesium-nickel molar ratio=50:1), 0.0067mol / L (magnesium-nickel molar ratio=75 : 1), 0.005 mol / L (magnesium-nickel molar ratio=100:1), 0.0033 mol / L (magnesium-nickel molar ratio=150:1). Then prepare an alkaline solution containing sodium hydroxide and sodium bicarbonate, the concentration of sodium hydroxide in the solution is 3 mol / L, and the concentration of sodium bicarbonate is 1.5 mol / L. Take the above-mentioned mixed aqueou...

Embodiment 2

[0039] This example illustrates the use of a magnesium-nickel double metal oxide solid base catalyst (magnesium-nickel molar ratio=20:1) to catalyze the alcoholysis of PET with ethylene glycol.

[0040] 1g PET pellets, 4g ethylene glycol and 10mg magnesium-nickel double metal oxide solid base catalyst (magnesium-nickel molar ratio = 20:1) were charged into a 25mL reaction vessel, and the vessel was placed in an oil bath pot equipped with a magnetic stirrer The reaction was continued at 180 °C for 1 h, and the stirring rate was 400 rpm. After the reaction was completed, water was added to the reaction system, and suction filtration was performed to obtain BHET monomer. Under this condition, the conversion rate of PET was 100%, and the yield of BHET was 82.50%.

Embodiment 3

[0042] This example illustrates the use of a magnesium-nickel double metal oxide solid base catalyst (magnesium-nickel molar ratio=50:1) to catalyze the alcoholysis of PET with ethylene glycol.

[0043] 1g PET particles, 4g ethylene glycol and 10mg magnesium-nickel double metal oxide solid base catalyst (magnesium-nickel molar ratio = 50:1) were charged into a 25mL reaction vessel, and the vessel was placed in an oil bath pot equipped with a magnetic stirrer The reaction was continued at 180 °C for 1 h, and the stirring rate was 400 rpm. After the reaction was completed, water was added to the reaction system, and suction filtration was performed to obtain BHET monomer. Under this condition, the conversion rate of PET was 100%, and the yield of BHET was 87.30%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a solid base catalyst for alcoholysis of PET (polyethylene terephthalate), which comprises the following steps: (1) dissolving magnesium chloride, beta-alanine and nickel chloride in deionized water to obtain a mixed aqueous solution; dissolving sodium hydroxide and sodium bicarbonate in deionized water to obtain an alkali solution; adding the aqueous alkali into the mixed aqueous solution, and mixing to obtain a turbid liquid; (2) stirring the turbid liquid obtained in the step (1) for reaction to obtain reaction liquid containing magnesium-nickel bimetal hydroxide, carrying out solid-liquid separation to obtain a solid part, and washing and vacuum-drying the solid part to obtain a solid base catalyst precursor; and (3) calcining the solid base catalyst precursor obtained in the step (2). The solid alkali can serve as a catalyst to be applied to alcoholysis of waste PET, the product yield is high, introduction of impurities in a reaction system can be effectively reduced, the product purity is high, raw materials are cheap and easy to obtain, and potential application prospects are achieved.

Description

technical field [0001] The invention relates to the field of waste plastic recycling, in particular to a preparation method of a solid base catalyst for alcoholysis of PET. Background technique [0002] Polyethylene terephthalate (PET) has good corrosion resistance and air tightness, is odorless and non-toxic, and is widely used in spinning, food packaging, electronic appliances, fibers, films and other fields. Since waste PET is difficult to degrade in nature, it is easy to cause serious environmental pollution, and landfill and incineration are likely to cause waste of resources. Therefore, the recycling technology method of waste PET has attracted much attention. [0003] At present, the recycling methods of PET mainly include physical recycling and chemical recycling. Physical recycling is basically based on downgrading recycling, and chemical recycling can degrade waste PET into monomers or products with high added value. The current main chemical recovery methods inc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J37/08C07C67/03C07C69/82
CPCB01J23/78B01J23/002B01J37/082C07C67/03C07C69/82Y02W30/62
Inventor 江伟林予恒孙平曹静静李爱民张全兴
Owner NANJING UNIV