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1. 发明申请

US20210269616A1 FRACTIONATION AND DEPOLYMERISATION OF LIGNOCELLULOSIC MATERIAL 有权
公开(公告)号：US20210269616A1
公开(公告)日：2021-09-02
申请号：US17255163
申请日：2019-06-25
申请人： KATHOLIEKE UNIVERSITEIT LEUVEN
发明人： Bert Sels , Tom Renders , Elias Cooreman , Sander Van Den Bosch
IPC分类号： C08J11/16 , C07C27/06 , B01J19/00
摘要： Lignocellulose constitutes an alluring renewable feedstock for the production of bio-based chemicals. This contribution demonstrates for the first time a chemocatalytic biorefinery concept that produces three separate product fractions of valuable product families at high yield and purity from lignocellulosic biomass; the product families, merely comprising of stable products, are (i) a lignin oil enriched with high contents of lignin-derived (mono)phenolics, (ii) essentially humin (furanic oligomers)-free hemicellulose-derived polyols, and (iii) a cellulose pulp. This is achieved by processing biomass in a close to equivolumetric mixture of an alcohol (such as n-butanol) and water at elevated temperature, in the presence of a metal catalyst and hydrogen. During this one-pot fractionation process, the hot liquor disentangles the polymeric biomass and depolymerises lignin and hemicellulose, while the catalyst and reductive environment are essential to accumulate and target stable products at high yield (such as phenolics and polyols, respectively). The process is particularly industrially relevant because its overcomes difficult and complex separation protocols, at place in classic biorefinery technology; the process foresees simple product recuperation in one process step into the three fractions; the solid carbohydrate pulp (mainly cellulose) is retrieved upon filtration, while phase separation of n-butanol and water occurs below 125° C., offering a facile and effective strategy to isolate lignin-derived phenolics, present in the alcohol (such as n-butanol phase) from polyols, present in the aqueous phase at the same time. The three resulting product streams provide a versatile platform for down-stream conversion towards added-value bio-based chemicals.

2. 发明授权

US10899730B2 Process for preparing cyclic esters from alpha-hydroxy esters and catalysts used therein 有权
公开(公告)号：US10899730B2
公开(公告)日：2021-01-26
申请号：US16336014
申请日：2017-09-25
申请人： KATHOLIEKE UNIVERSITEIT LEUVEN
发明人： Rik De Clercq , Michiel Dusselier , Bert Sels
IPC分类号： C07D319/12
摘要： A process for preparing cyclic esters by means of a transesterification reaction in the gas phase, comprises the steps of: (i) vaporizing a liquid solution of alpha-hydroxy esters, (ii) passing the ester vapors through a reaction zone containing a solid catalyst and (iii) recovering the cyclic esters from the gaseous product stream; and wherein the solid catalyst comprises at least one metal of titanium (Ti) and Zirconium (Zr), and a SiO2 support, and wherein said metal is chemically bound to the SiO2 support through M-O—Si chemical bonds.

3. 发明授权

US11414519B2 Ortho alkoxy bisphenol monomers 有权
公开(公告)号：US11414519B2
公开(公告)日：2022-08-16
申请号：US16627054
申请日：2018-06-28
申请人： KATHOLIEKE UNIVERSITEIT LEUVEN
发明人： Bert Sels , Steven-Friso Koelewijn
IPC分类号： C08G63/672 , B01J29/08 , B01J29/18 , B01J29/70 , C07C39/16 , C08G64/30
摘要： A process for making ortho alkoxy bisphenol monomers includes contacting an (alk-1-enyl)alkoxyphenol (type 1) with an alkoxyphenol (type 2) in the presence of an acidic catalyst. Both type of renewable phenols (type 1 and 2) can be generated from lignocellulosic biomass. The use of such alkoxy phenols as a precursor to bisphenol monomers has the potential to reduce the cost and environmental impact of structural materials, while meeting or exceeding the performance of current petroleum-derived polymers, such as thermoplastics and thermoset resins.

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