This presentation lays the groundwork for a PhD focused on integrated biorefinery concepts in the pulp and paper industry. The core of the work is the development, characterization, and optimization of a flow-through prehydrolysis-kraft process to produce high-purity dissolving pulps suitable for use in regenerated cellulose products (like Lyocell and viscose). The research encompasses: Detailed compositional analysis of process streams and pulps. Comparative assessment of batch vs. flow-through reactors for process efficiency and product quality. Recovery and enhancement of valuable byproducts (e.g., XOS for prebiotic and structural applications; lignin for advanced material applications). Proposed biochemical (enzyme-aided) and process engineering optimizations to increase yield, purity, and value of both main and side products. Emphasis on the circular economy and sustainable feedstock use for next-generation cellulose textiles and bio-based chemicals. The study positions itself at the intersection of pulp engineering, biotechnology, and materials science, contributing both fundamental insights and practical pathways for sustainable industrial development