4 results about "Gamma-Valerolactone" patented technology

The application belongs to the technical field of deep eutectic solvents, and particularly relates to a ternary deep eutectic solvent and preparation and application thereof. The ternary deep eutectic solvent is composed of choline chloride, 5-sulfosalicylic acid and gamma valerolactone according to a molar ratio of 1:4:(3-25). The strong hydrogen bond network structure between the green solvent system first destroys the ester bond between lignin and hemicellulose, then cuts off the beta-O-4 bond between lignin molecules, so as to separate lignin. Meanwhile, the deep eutectic solvent can improve the stability of carbon cations due to the conjugation effect between the lone pair electrons on the heteroatom oxygen and the central carbon in the molecular structure of gamma valerolactone, so as to inhibit the condensation reaction of lignin.

This invention discloses a method for preparing a metal phosphide catalyst. The method involves uniformly mixing a carbon-containing precursor with a phosphorus-containing precursor solution and then drying the mixture to obtain a solid product. The solid product is then pyrolyzed under an inert atmosphere. The pyrolyzed solid product is washed and dried to obtain a phosphorus-doped carbon material. A metal salt solution is then uniformly mixed with the obtained phosphorus-doped carbon material, dried, and reduced under a hydrogen-containing gas atmosphere to obtain the metal phosphide catalyst. Thus, this invention prepares phosphorus-doped porous carbon through the pyrolysis of a carbon precursor and a phosphorus-containing precursor. This utilizes the binding effect of phosphorus functional groups with metal ions to inhibit the migration and aggregation of metal particles under high-temperature conditions, effectively preventing metal particle sintering and improving the yield of the target catalytic product.

A method of forming gamma valerolactone (GVL) includes contacting a mixed feed stream comprising unreacted 3-pentenenitrile (3PN) and water within a first reactor in the presence of a heterogeneous catalyst. The reaction can occur at a temperature range of 100°C to 400°C and under a pressure of 150 pounds per square inch (psi) or less. The method involves separating unreacted 3PN and water from the GVL product, then routing these unreacted components back to the first reactor for further GVL formation.

A first aspect of the invention relates to a method for recycling a colored polymer material, the colored polymeric material comprises (i) a polyalkylene terephthalate-based polymer, (ii) a colorant and optionally (iii) a second polymer different from the polyalkylene terephthalate-based polymer of (i) and optionally (iv) different from the polyalkylene terephthalate-based polymer of (i) and different from (iii) a third polymer that is the second polymer, the method comprising (a) providing a colored polymeric material and a solvent system comprising gamma valerolactone (GVL); (b) contacting the colored polymeric material provided in (a) with the GVL-containing solvent system provided in (a) under conditions that allow colorant removal but do not allow the polyalkylene terephthalate-based polymer to dissolve, thereby obtaining a solvent system rich in colorants compared to the solvent system provided and a polymeric material poor in colorants compared to the colored polymeric material provided in (a); (c) the depolymerization or transesterification of the colorant-depleted polymeric material obtained in (b); thereby obtaining a monomer and / or oligomer or transesterification product. In a second aspect, the invention relates to monomers, oligomers or transesterification products of polyalkylene terephthalate-based polymers obtained or obtainable by the process of the first aspect. A third aspect relates to a process comprising converting, preferably polymerizing, a monomer, oligomer or transesterification product of a polyalkylene terephthalate-based polymer obtained by the process of the first aspect to obtain one or more polymers or polymer products. A fourth aspect relates to a process comprising converting an isolated second polymer (iii) and / or an isolated third polymer (iv) obtainable by or obtained from the first aspect process to obtain one or more monomers, polymers or polymer products.