What is Organosolv pulping?
Organosolv pulping is a two-stage process involving hydrolysis (decomposition of wood by use of a catalyst) and removal of lignin with an organic solvent (usually a mixture of alcohol and water).
What are solvents used in organic solvent pulping?
For pulp production The commonly used solvents acetone and ethanol have been examined with respect to pulp properties. The pulping of wheat straw with 40% mixtures of acetone or ethanol with water requires 60 minutes at 180 °C to give good pulp properties.
What is wheat straw pulp?
Wheat straw is a kind of annual vascular-bundled herbal arthrophyte containing cellulose fibers that are acceptable for pulping and papermaking.
What is kraft pulp used for?
Kraft processes produce a variety of pulps used mainly for packaging and high-strength papers and board. In this method, wood chips are cooked with caustic soda to produce brownstock, which is then washed with water to remove the cooking liquor for the recovery of chemicals and energy.
What is kraft lignin?
Kraft lignin is a kind of industrial lignin obtained from Kraft pulp, which accounts for about 85% of the total lignin production in the world. Currently, production of Kraft lignin is about 630,000 tons per year, it is mainly used in the form of combustion for heat recovery, resulting in low-value utilization.
What is wheat straw pulp used for?
Pulp from wheat straw can be used to make packaging, molded products such as plates and food containers, tissues and towels. Sustainable Fiber and its technology, branded as the Phoenix Process, has made it more realistic to produce pulp from wheat straw.
What is wheat straw?
Wheat straw is the stalk left over after wheat grains are harvested. Traditionally, it has been treated as a waste. In some countries, farmers burn it, contributing to air pollution and creating a public health hazard. However, these stalks still have value.
Why is it called kraft pulp?
The process name is derived from German word Kraft, meaning “strength” in this context, due to the strength of the kraft paper produced using this process.
How is kraft pulp made?
We make kraft pulp by mixing wood fibres with a solution of caustic soda and sodium sulphide, and cooking them inside a digester. This separates the fibres from the lignin, which is a natural glue-like substance that binds them together.
What is hardwood kraft pulp?
Bleached Hardwood Kraft Pulp (BHKP) is commonly used in paperboard and specialty paper, as well as coated and uncoated papers and tissue. In many applications, hardwood pulp provides excellent strength and surface properties.