(PDF) Comparison of bleaching sequences (PF, PH and PY ...
For the bleaching of mechanical pulps, such phosphorus compounds have a bleaching power similar to that of sodium hydrosulphite, but they can be used over a wider range of pH (4.3-9.3 ...
72. Paper and Pulp Industry - iloencyclopaedia.org
The method evolved from soda pulping (which uses only sodium hydroxide for digestion) and began to gain prominence in the industry from the 1930s to 1950s with the development of chlorine dioxide bleaching and chemical recovery processes, which also produced steam and power for the mill.
Keane-Technical Methods of Chemical Analysis Vol 1 PT 1 ...
Keane-Technical Methods of Chemical Analysis Vol 1 Pt 1 1908 - Free ebook download as PDF File (.pdf), Text File (.txt) or read book online for free.
What chemicals are used to make paper? - Quora
Answer (1 of 2): Optical brightening agent – Paper that is derived from both natural or synthetic fiber pulp is not completely naturally white, so manufacturers often add agents that increase its fluorescence. This is done for majority of paper used today. Pigment – Coloring of paper is common, ...
Sodium Hydro Dul Fide | Sulfur Dioxide | Bleach
OECD SIDS SODIUM DITHIONITE SIDS Initial Assessment Report For SIAM 19 Berlin, Germany, 19-22 October 2004. A final evaluation of the Human Health part has been performed by the Federal Institute for Risk Assessment (BfR) and of the ecotoxicological part by the Federal Environment Agency (UBA) All data have been checked and validated by BUA.
Bleaching fabrics and the bleaches to use
There are four types of bleach are useful in cleaning fabrics. 1. Sodium Hypochlorite. This is normal bleach and is the only one to feature on care labels. If the label has a triangle on it (not crossed through) then chlorine bleaching is OK.
Suzhou Liansheng Chemistry Co., Ltd. Supplier from China ...
Commodity: Sodium Metabisulphite Molecular formula:Na2S2O5 Molecule Weight:190.10 H.S code:28321000 CAS: Product Features Appearance : White Or Light Yellow Crystal Powder Odour: Sulfur Dioxide Taste : Salty Melting Poing : 150 Specific Density1.48 Ph : 4.0-4.6 Solubility : Soluble In Water,insoluble In Alcohol Application: 1.
Eurotabs S.C.R.I.S. Supplier from Belgium. View Company.
Eurotabs S.C.R.I.S. Supplier from Belgium. View Company. ... Need some help? Contact Customer Support Your Feedback Forgot Password go4WorldBusiness Q&A Korean: 한국 고객을 위한
Determination of Sodium Hypochlorite in Bleach I ...
Standardization of Sodium Thiosulfate In this experiment you will be determining t he mass percent of sodium hypochlorite in bleach via a sodium thiosulfate titration. You will standardize the sodium thiosulfate solution before using it to titrate bleach. Use …
8 Best Practices for Pumping Sodium Hypochlorite (Bleach)
Sodium hypochlorite (or bleach) is a key component in thousands of production and disinfection processes in a variety of industries. It can be used to disinfect drinking water, prevent the growth of algae and shellfish, control odors in water and wastewater treatment plants, and much more.
(PDF) Correlation Between Chromophore Impurity Content and ...
Kaolin has been used as an alternative cheap raw material for the synthesis of zeolite 4A. Two steps are involved in the reaction: (1) dehydroxylation of kaolin at 550-900 degrees C to form an ...
10,000 Objective GK in English – Page 12
In the reducing action of SO2, oxygen is removed from coloured dye. Sulphur dioxide is used to bleach wool and silk. Salts of sulphur dioxide are also used in bleaching. Calcium hydrogen sulphite Ca(HSO3)2 is used to whiten wood pulp in the manufacturing of paper. Other than SO2, sodium hydrosulphite (Na2S2O4) is also used to bleach wool.
EP1146089A1 - Methods for bleaching kaolin clay and …
Improved methods for bleaching kaolin clay and other minerals are provided. More particularly, methods of the present invention employ a hydrosulfite or bisulfite material and a second reducing agent, preferably a reducing agent that contains a Group III element, such as a borohydride, to increase the brightness of kaolin clay and other minerals and reduce color present therein.
Indian Patents. 214743:DETERGENT COMPOSITIONS
Such a bleach system may generally comprise any source of oxidative or reductive bleach, for example chlorine bleaches such as hyophalite, especially hypochlonte; any hypohalite precursor, such as sodium dichloroisocyanurate, or any reductive bleach, for example sodium hydrosulphite or sodium bisulfite. Preferred bleach systems include those ...
Environmentally Benign Approaches for Pulp Bleaching ...
The results showed that when the pulp was treated with an alkali and hydrogen peroxide treatment method with an alkali dosage of 6% and a hydrogen peroxide dosage …
Bulk Density Chart - Anval
Bleach Compound 60 961 Blood Flour 30 481 Blood Meal 38.5 617 Bone Meal Loose 55 881 Bone, Ground Dry 75 1202 ... Kaolin 49 785 Kaolin Clay 50 801 Latex Powder 89 1426 ... Sodium Hydrosulphite 73 1169 Sodium Hydroxide 60 961 Sodium Metasilicafe 70 1121 Sodium …
HEMICELLULASES IN PULP BLEACHING PDF
The xylanase activity of the enzyme preparations is determined as follows: After delignification, the final remaining lignin in the pulp is removed by treating it with oxidizing chemicals such as chlorine dioxide, sodium hypochlorite and sodium hydrosulphite. After the weak black liquor has been sprayed onto the pulp, a xylanase enzyme made by T.
Vat Dyeing - an overview | ScienceDirect Topics
The presence of hydrosulphite and caustic soda is tested by a change in colour of vat yellow paper to blue and phenopthalene to pink, when brought in contact with the solution. The vatted dye solution can be added to a dyebath containing the required amount of caustic soda and sodium hydrosulphite and kept at the recommended temperature (Table ...
Kaolin Bleaching by Leaching Using Phosphoric Acid Solutions
acid [13], EDTA [14], sodium dithionate-H 2 SO 4 mixtures [15], and so on, have been employed to lower the content of these impurities in the kaolin clays. In this study, the application of phosphoric acid to bleach kaolin clays is reported for the first time. Furthermore, the re-sidual solutions that have formed can be used to manufacture
Australian Paper
Australian Paper is the sole producer of fine and writing papers and sack and bag grade paper in Australia. Australian Paper mainly focus on office paper, converting paper and specialty and papers. Australian Paper have two mills located at Maryvale (Victoria), Shoalhaven (NSW).
Sodium Hypochlorite - an overview | ScienceDirect Topics
Sodium hypochlorite is produced for the treatment of cooling water (CW). Sea water is pumped through strainers to banks of electrochiorination cells. Thyristor controlled rectifier units provide LV variable voltage DC supplies to the cells, thereby controlling the rate of production of sodium hypochlorite by electrolysis within the cells. A by-product of the process is hydrogen, which is of ...
Knit Fabric Coloration - Assignment Point
Methods of coloration. There are 2 types of methods-. 1. Continuous method. 2. Discontinuous or exhaust method. Continuous method: This is the process where fabric moves continuously by the guide rollers. Fabric gets a very short time in liquor and goes to another bath in a continuous manner.
2,4,6-Trichloropyrimidine by Kadira Biosciences. Supplier ...
2. bleaching paper pulps, especially mechanical pulps, its the most fittable bleaching agent in pulps. 3. bleaching kaolin clay, fur bleaching and reductive whitening, bleaching of bamboo products and straw products, 4. in mineral, the compound of thiourea and other sulphides. 5. as …
(PDF) Removal of iron and titanium contaminants from ...
by chemical leaching with sodium hydrosulphite (Na. 2. S. 2. O. 4 ... Toro L. Process development of kaolin bleach-ing using carbohydrates in acid media. ... industrially applied methods …
method of kaolin mining - crusherasia.com
Kaolin mining method, kaolin mining Craft, Kaolin mining … kaolin mine. China produced 70% to 80% of kaolin for ceramics and refractoriness, most of the direct use of ore, low-end for refractoriness. ... method of dosing sodium hydrosulphite to bleach kaolin | Solution ...
Sodium Hydrosulphite - an overview | ScienceDirect Topics
R.B. Chavan, in Handbook of Textile and Industrial Dyeing, 2011 16.5.1 Vat dyes. Vat dyes are applied by using sodium hydrosulphite (sodium dithionate) as reducing agent and sodium hydroxide as an alkali. Some by-products of sodium hydrosulphite are acidic in nature, necessitating overdosing of sodium hydroxide over stoichiometric requirement. A few of the by-products formed are sulphur ...
Recycled Fibre Bleaching With Hydrogen Peroxide
their use. Traditionally Sodium Hydrosulphite and Hydrogen Peroxide have been used to bleach deinked ground wood pulps. For high brightness gains combination of hydrogen Peroxide and Sodium Hydrosulphite bleaching is most .efficient. Brightness improvement in recycled deinked pulp depends upon(1) IPPTA Convention Issue. Dec. 1998 1) Type of ...
Recycling of colored office paper. Part I: Pre-bleaching ...
Traditionally, sodium hydrosulphite is an efficient and cheap color stripping agent due to its reducing effect of dye (Dumont et al. 1994; Fluet and Shepperd 1997; Carré et al. 2000). It reduces aldehyde and keto groups. However, the usage conditions and handling of sodium hydrosulphite are not suitable for a pulper (pre-bleaching).
Hydrosulfites - an overview | ScienceDirect Topics
Pratima Bajpai, in Environmentally Benign Approaches for Pulp Bleaching, 2005. 5.3 Bleaching with dithionite. Sodium dithionite is a reductive bleaching chemical. It is also known as sodium hydrosulphite. Reductive bleaching is especially essential not only for bleaching, but also for removing colour from coloured recovered paper and carbonless paper (Hache et al., 1994; Dumont, 1994; Fluet ...
Wet - Operator Essentials - Sodium Hypochlorite
Sodium hydroxide Sodium hydroxide (NaOH) is often called caustic soda. This compound has an extremely high pH when dissolved in water. Sodium hypochlorite strength Common hypochlorite sold in stores ( bleach) is 5.25% chlorine since lower concentrations are more stable. Industrial hypochlorite is 12 to 15 trade percent chlorine.
