Search results
Results from the WOW.Com Content Network
This is more common in TCF bleaching sequences for two reasons: the acidic chlorine or chlorine dioxide stages tend to remove metal ions (metal ions usually being more soluble at lower pH), and TCF stages rely more heavily on oxygen-based bleaching agents, which are more susceptible to the detrimental effects of these metal ions.
The traditional ECF sequence is DEopDEpD [1]: 14 using the common letter symbols for bleaching stages, [2] though many improved sequences are available. [ 1 ] : 15 Totally chlorine free (TCF) is paper that does not use any chlorine compounds for wood pulp bleaching.
The principal example is tert-butyl hypochlorite, which is a useful chlorinating agent. [3] Most hypochlorite salts are handled as aqueous solutions. Their primary applications are as bleaching, disinfection, and water treatment agents. They are also used in chemistry for chlorination and oxidation reactions.
Percent active chlorine in these materials ranges from 20% for bleaching powder to 70% for HTH. Potassium hypochlorite, KOCl. This was the first chlorine-based bleaching agent, which became available around 1785 under the name Eau de Javel or "Javel water". It is no longer commonly used, having been superseded by the cheaper sodium analog.
[38] Most TCF pulp is produced in Sweden and Finland for sale in Germany, [36] all markets with a high level of environmental awareness. In 1999, TCF pulp represented 25% of the European market. [39] TCF bleaching, by removing chlorine from the process, reduces chlorinated organic compounds to background levels in pulp mill effluent. [40]
This bond is easily broken, giving rise to very reactive oxygen species, which are the active agents of this type of bleach. The main products in this class are: Hydrogen peroxide (H 2 O 2). It is used, for example, to bleach wood pulp and hair or to prepare other bleaching agents like perborates, percarbonates, peracids, etc. Sodium ...
Trichloroisocyanuric acid is an organic compound with the formula (CONCl) 3.It is used as an industrial disinfectant, bleaching agent and a reagent in organic synthesis. [1] [2] [3] This white crystalline powder, which has a strong "chlorine odour," is sometimes sold in tablet or granule form for domestic and industrial use.
A sample of fuller's earth in its raw state from Pakistan. Fuller's earth is a term for various clays used as an absorbent, filter, or bleaching agent. Products labeled fuller's earth typically consist of palygorskite (also known as attapulgite) or bentonite. [1]