Bleaching of Wood Pulp - Bleaching Chemical Pulps - Hydrogen Peroxide

Hydrogen Peroxide

Using hydrogen peroxide to delignify chemical pulp requires more vigorous conditions than for brightening mechanical pulp. Both pH and temperature are higher when treating chemical pulp. The chemistry is very similar to that involved in oxygen delignification, in terms of the radical species involved and the products produced. Hydrogen peroxide is sometimes used with oxygen in the same bleaching stage and this is give the letter designation Op in bleaching sequences. Metal ions, particularly manganese catalyze the decomposition of hydrogen peroxide, so some improvement in the efficiency of peroxide bleaching can be achieved if the metal levels are controlled.

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Other articles related to "hydrogen peroxide, peroxide, peroxides":

Hydrogen Peroxide - Safety - Historical Incidents
... On July 16, 1934, in Kummersdorf, Germany, a rocket engine using hydrogen peroxide exploded, killing three people ... As a result of this incident, Wernher von Braun decided not to use hydrogen peroxide as an oxidizer in the rockets he developed afterward ... Several people received minor injuries after a hydrogen peroxide spill on board Northwest Airlines flight 957 from Orlando to Memphis on October 28, 1998 and ...
Lactoperoxidase - Function
... Lactoperoxidase catalyzes the hydrogen peroxide (H2O2) oxidation of several acceptor molecules reduced acceptor + H2O2 → oxidized acceptor + H2O Specific examples include thiocyanate (SCN–) → hypothiocyanite (OSCN ... Research (1984) "The effect of lactoperoxidase-thiocyanate-hydrogen peroxide mixtures on bacteria is dependent on experimental conditions ... If the bacteria are cultured after the exposure to lactoperoxidase-thiocyanate-hydrogen peroxide on nutrient agar under aerobic conditions, they may not grow, whereas they grow readily on blood ...
... Retr0bright is hydrogen peroxide, a small amount of an "active oxygen" laundry booster TAED as a catalyst, and a UV lamp ... optimum mixture and conditions for reversing yellowing of plastics Hydrogen peroxide solution, the stronger the better ... Hydrogen peroxide can cause serious chemical burns and blindness if splashed in the eyes ...
Blanqueador - Classes of Bleaches - Peroxide-based Bleaches
... After chlorine-based bleaches, the peroxide bleaches are most commonly encountered ... Peroxides are compounds that contain an oxygen-oxygen single bond, O-O ... This is a fairly weak bond so reactions of peroxides often involve breaking this bond, giving very reactive oxygen species ...
Microplasma - Plasma Medicine - Dental Treatments
... teeth along with saline or whitening gels that consist of hydrogen peroxide ... colleagues experimented with this method, examining how microplasma along with hydrogen peroxide effects blood stained human teeth ... Group one received 30% hydrogen peroxide activated by microplasma for thirty minutes in a pulp chamber, while group two received 30% hydrogen peroxide alone for thirty minutes in the pulp chamber and the temperature ...

Famous quotes containing the word hydrogen:

    All you of Earth are idiots!... First was your firecracker, a harmless explosive. Then your hand grenade. They begin to kill your own people a few at a time. Then the bomb. Then a larger bomb, many people are killed at one time. Then your scientists stumbled upon the atom bomb—split the atom. Then the hydrogen bomb, where you actually explode the air itself.
    Edward D. Wood, Jr. (1922–1978)