Biogenic Guanidine Complex Catalyst for PET Synthesis
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Solution Overview
Problem
The production of polyethylene terephthalate (PET) using antimony catalysts poses a threat to ecological and human health due to toxicity, necessitating a safer alternative.
Innovation Solution
A method involving the preparation of biogenic guanidine complexes, such as (Gaa)FeCl2, (Cra)Mg(OAc)2, and (Gua)Zn(OLa)2, which are used as catalysts in the production of PET and poly(ethylene isophthalate-co-terephthalate) (PEIT), replacing toxic antimony compounds and employing a solvent mixture of DMSO and water, followed by specific temperature and pressure conditions in reactors for polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If antimony compounds are used as catalysts in PET production, then the polymerization reaction can be effectively catalyzed, but the resulting PET products pose threats to ecological environment and human health due to toxicity
Solution Approach 1:
The patent removes the harmful antimony catalyst from the PET production process and replaces it with a biogenic guanidine complex catalyst. This extraction of the toxic element while maintaining the catalytic function directly resolves the contradiction between manufacturing efficiency and environmental safety.
Solution Approach 2:
The biogenic guanidine complex serves as an intermediary catalyst that mediates the polymerization reaction between terephthalic acid and ethylene glycol. This intermediary replaces the toxic antimony compound while maintaining catalytic activity, thus resolving the contradiction between effective catalysis and non-toxicity.
2Ease of manufacture
If traditional antimony catalysts are used, then the polymerization process is well-established, but the products require extensive purification to remove toxic residues
Solution Approach 1:
The biogenic guanidine complex catalyst is designed to be easily removable and biodegradable, replacing the persistent antimony catalyst. This allows for simpler purification processes and reduces the need for extensive treatment to remove toxic residues, thereby reducing purification costs and product loss.
3Object-affected harmful factors
If biogenic guanidine complexes are used as catalysts, then environmental and biological safety is improved, but the catalytic activity and polymerization efficiency need to be optimized
Solution Approach 1:
The patent optimizes the molecular structure and composition parameters of the biogenic guanidine complex catalyst to enhance its catalytic activity. By adjusting parameters such as the guanidine to metal ratio, solvent composition, and reaction conditions, the catalyst achieves high polymerization efficiency while maintaining environmental safety.
4Object-affected harmful factors
If new biogenic catalysts are introduced, then toxicology concerns are resolved, but the process complexity and development time increase
Solution Approach 1:
The biogenic guanidine complex catalyst demonstrates universal applicability across different polyester production processes, including PET and PEIT synthesis. This multi-functionality reduces the need for developing separate catalyst systems for different applications, thereby simplifying the overall development process while eliminating toxicity concerns.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of biogenic guanidine complexes as catalysts results in environmentally and biologically safe PET and PEIT products with high selectivity, controlled polymerization, and excellent performance, achieved under mild and energy-saving reaction conditions, with yields exceeding 98% and characteristic parameters like intrinsic viscosity ≥ 0.675 DL/g and melting point ≥ 257°C.
Implementation Method 1
adding to a reactor, terephthalic acid (TA), ethylene glycol (EG), and guanidine complex GMX2/G2MX2 in a molar ratio TA: EG: GMX2/G2MX2 = 1.0: 1.3: (2.0-3.0) × 10-5
Implementation Method 2
mixing dimethyl sulfoxide (DMSO) with water in a volume ratio thereof of 1: 1 to yield a solvent DMSO-H2O
Data Source
AI summary
A method for preparing a biogenic guanidine complex, the method including: mixing dimethyl sulfoxide (DMSO) with water in a volume ratio thereof of 1: 1 to yield a solvent DMSO-H2O; adding organic guanidine (G) and a compound MX2 in a molar ratio G/ MX2 = 1: 1 or 2: 1 to the solvent DMSO-H2O, where the organic guanidine (G) is selected from arginine (Arg), guanidinoacetic acid (Gaa), creatine (Cra), creatinine (Cran), guanine (Gua), and agmatine (Agm); M represents Fe2+, Mg2+, or Zn2+; and X represents Cl-, CH3COO-, or CH3CH(OH)COO-; stirring the solvent DMSO-H2O containing the organic guanidine and the compound MX2; recycling the solvent DMSO-H2O through vacuum distillation and obtaining a solid; transferring the solid to a Buchner funnel, and washing the solid with deionized water and ethanol consecutively; and removing the deionized water and ethanol through vacuum filtration, and drying the solid.