# The Separation and Utilization of Biomass Components in the Pre-Hydrolysis Liquor of Kraft-Based Dissolving Pulp Production Process—A Review

## TL;DR

This review discusses methods to separate and use biomass components from pre-hydrolysis liquor in pulp production to support sustainable biomass refining.

## Contribution

The paper provides a comprehensive review of separation technologies and utilization strategies for pre-hydrolysis liquor components.

## Key findings

- Acidification, ethanol precipitation, and adsorption are effective for component separation and impurity removal.
- Hemicelluloses from PHL can be used to produce furfural, adhesive, and biofuel.
- Lignin from PHL has various applications, and full utilization without separation is also feasible.

## Abstract

The effective utilization of biomass components in the pre-hydrolysis liquor (PHL) of lignocellulose is a crucial way for traditional pulp and paper mills converting into biomass refining facilities. In the present work, separation technologies are summarized and reviewed—including acidification, ethanol precipitation, flocculation and coagulation, adsorption, solvent extraction, enzyme treatment, and oxidation—with regard to component separation and impurity removal. The utilization of hemicelluloses from PHL for the production of furfural, adhesive and biofuel, as well as the application of lignin separated from PHL and the full components utilization of PHL without separation is reviewed and analyzed.