What is meant by dissolving pulp?

Dissolving pulp, also called dissolving cellulose, is bleached wood pulp or cotton linters that has a high cellulose content (> 90%). It has special properties including a high level of brightness and uniform molecular-weight distribution.

What are the two types of pulping?

There are many types of paper pulp processing, chemical pulping, mechanical pulping and chemi-mechanical pulping are three typical types among them. Take chemical pulping as an example, it has three basic procedures like pulp cooking processing, pulp washing processing, and pulp bleaching processing.

What are the types of pulping process?

There are four broad categories of pulping processes: chemicaly semi-chemical, chemi-me- chanical, and mechanical pulping. These are in order of increasing mechanical energy required to separate fibers (fiberation) and decreasing reliance on chemical action.

What is Prehydrolysis?

Prehydrolysis is sometimes called hydro-thermal treatment or just pre-treatment since it is a treatment step before enzymatic hydrolysis. Prehydrolysis is typically performed at acid conditions, high temperature and pressure up to 25 bar.

What is specialty cellulose?

Specialty Cellulose develops, produces and sells cellulose mainly for use in the production of cellulose acetate, cellulose ethers and other specialty segments.

What is solvent pulping?

Solvents. Organosolv pulping involves contacting a lignocellulosic feedstock such as chipped wood with an aqueous organic solvent at temperatures ranging from 140 to 220 °C. This causes lignin to break down by hydrolytic cleavage of alpha aryl-ether links into fragments that are soluble in the solvent system.

What is mechanical pulping process?

Mechanical pulping is a process used for separating fibers without the addition of any chemicals. The process gives a pulp that is generally characterized by high yield that ranges from about 92 to 96%, and has high bulk, stiffness, opacity, and softness.

What is viscose pulp?

Viscose is a cellulosic fabric made from wood pulp. Viscose is also called Rayon and was first produced in 1883 as a cheaper alternative to silk. It is the third mostly used textile in the world.

What is Organosolv pretreatment?

Organosolv pretreatment is the process to extract lignin from lignocellulosic feedstocks with organic solvents or their aqueous solutions.

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.