Chemical reactivity of textile pulps (Circular textile)

Important results from the project

The purpose of the project has been to increase the knowledge of reactivity of cellulose from recycled textile waste (textile pulp) in both alkaline environment applicable to viscous production and in acidic for cellulose acetate. The goals were to increase knowledge about: -which textile pulp has the highest reactivity in each reaction -what process conditions give the highest reactivity -possibilities to increase reactivity of the textile pulp, and make an idea sketch for a research and innovation project. The goals have been met to a large extent, but some questions still remain.

Expected long term effects

The project has given increased knowledge about the reactivity of textile pulp and how the methods work for this type of raw materials. Increasing alkaline reactivity through swelling and treatment with enzymes has been shown to be possible in the laboratory. Needs to develop the methods of reactivity measurement have been identified. The prestudy has contributed to creating a further developed test environment and competence regarding cellulose products at Karlstad University and at Re:newcell. The prestudy has also increased the knowledge of the process and possible products.

Approach and implementation

The laboratory parts as well as trials and sampling in the factory were carried out according to plan with investigating raw materials, process and reactivity-increasing treatments. More time was spent on interpreting results and further lab experiments than deciding on the direction for a larger research project compared to the plan. Most interesting in a research perspective, but also most challenging is to further investigate why differences in reactivity occur between different cellulosic materials and differences between how they react in acidic and alkaline environments.