NOVELTY - Concurrent recovery of lignin derivatives and syngas from a lignocellulosic feedstock, comprises: perfusing and cooking the feedstock with an organic solvent, to produce a cellulosic solids output stream and a spent liquid solvent stream; separating the streams; recovering lignin derivatives to produce at least a partially delignified spent liquid solvent stream; recovering a portion of the organic solvent from the partially delignified spent liquid solvent stream, to produce a stillage; and gasifying the cellulosic solids output stream, to produce a combustible syngas.    USE - The process is useful for concurrent recovery of lignin derivatives and syngas from a lignocellulosic feedstock.    ADVANTAGE - The process: enables disposal of separated cellulosic solids stream as waste streams in an efficient, cost-effective and environmentally acceptable manner; and significantly reduces the problems associated with slag or ash production during gasification of unprocessed lignocellulosic feedstocks.    DETAILED DESCRIPTION - Concurrent recovery of lignin derivatives and syngas from a lignocellulosic feedstock, comprises: perfusing and cooking the feedstock with an organic solvent for a suitable period of time, to produce a cellulosic solids output stream and a spent liquid solvent stream, where the solvent stream comprises solubilized lignin derivatives and other organic compounds; separating the cellulosic solids output stream and spent liquid solvent stream; recovering lignin derivatives from the solvent stream, to produce at least a partially delignified spent liquid solvent stream; recovering a portion of the organic solvent from the partially delignified spent liquid solvent stream, to produce a stillage; and gasifying the cellulosic solids output stream, to produce a combustible syngas. INDEPENDENT CLAIMS are also included for:    (1) a biorefining system for recovering lignin derivatives from lignocellulosic feedstocks, comprising: a pulping unit configured to receive and process the lignocellulosic feedstock with an organic solvent to separate cellulosic solids stream and spent solvent black liquor stream comprising solubilized plant components from it; a black liquor processing unit configured to receive and process the black liquor stream for separation and recovery of many lignin derivatives, a portion of the organic solvent and at least a partially delignified stillage from it; and a gasification unit configured to receive and gasify the cellulosic solids stream and to recover a syngas stream from it; and    (2) a modular biorefining system for recovering lignin derivatives from lignocellulosic feedstocks, comprising: a first module comprising the pulping unit; a second module comprising the black liquor processing unit; and a third module comprising the gasification unit.