Contribuciones al desarrollo de una biorrefinería sostenible. Disolución/hidrólisis y re-polimerización de lignina en agua sub/supercrítica mediante reactores ultrarrápidos
Investigador principal.- MARÍA JOSÉ COCERO ALONSO
Título del proyecto.- Contribuciones al desarrollo de una biorrefinería sostenible. Disolución/hidrólisis y re-polimerización de lignina en agua sub/supercrítica mediante reactores ultrarrápidos
Código de referencia del proyecto.- CTQ2016-79777-R
Entidad Financiadora.- Ministerio de Economía y Competitividad y FEDER
Programa/Plan.- Programa Estatal de I+D+i Orientada a los Retos de la Sociedad
Año de la Resolución (fecha).- 2016
Importe concedido.- 183.000,00€
This project aims to study the fundamentals of dissolution / hydrolysis of lignin in water sub / supercritical, based on knowledge of reaction mechanisms, and on the kinetic studies carried out in ultra-fast reactors. This contribution will advance the development of fractionation of lignocellulosic biomass using water sub / supercritical, providing conditions for the selective separation of lignin fraction. Furthermore, previous studies provided herein show that the hydrolysis of lignin in ASC involves a quick re-polymerization, and it takes place in residence time less than 1 s . On this basis it is proposed to conduct a study monitoring the re-polymerization operating in ultrafast reactors, to provide knowledge about the characteristics and properties of “phenolic char” formed (that it is the basis of re-polymerized lignin).
In previous projects we have studied the mechanisms of cellulose hydrolysis in ASC and its kinetics. Achieving a selective transformation of cellulose to sugars of 95% operating with residence times of 30 ms; sugars to C3 to C2 building blocks with selectivity higher than the
80% operating with residence times of 1-3 s. The control of the reaction medium properties and of the residence time has provided selectivity that is not achieved with any other processes.
The objectives of this project aims to advance in the development of bio-refineries, providing selectivity use of ASC as solvent and reaction medium, by inhibiting reactions with ionic mechanism taking place in subcritical conditions. Kinetic studies can allow validate the hypothesis that operating with residence times of milliseconds could control the lignin polymerization reaction. We are the only group that currently has the knowledge to develop facilities operating with residence times of milliseconds, acquired working for over 20 years in
supercritical water reactors and processes development.
An initial study will be conducted by using sudden decompression reactors, developed in the previous project. These reactors can operate with residence times from 4 milliseconds. After that, specific reactors will be developed to perform the studies in the range of time where the dissolution / hydrolysis of lignin and re-polymerization take place. The specific objectives are:
- To develop a model describing the dissolution / hydrolysis and polymerization of lignin in supercritical water, proposing and validating the reaction mechanisms and making the corresponding kinetic studies.
- To design the micro reactor devices to perform these studies in the time range where the hydrolysis and polymerization occurs. It will take into account kinetic data, mass transfer, hydrodynamics and phase behavior.
- Study the fractionation of lignocellulosic biomass (wheat bran and spent coffee waste) in water sub/supercritical with ultrafast reactors, supported on the hydrolysis and re-polymerization kinetics, to improve the selectivity of the process.