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Organosolv
In industrial paper-making processes, organosolv is a pulping technique that uses an organic solvent to solubilise lignin and hemicellulose. It has been considered in the context of both pulp and paper manufacture and biorefining for subsequent conversion of cellulose to fuel ethanol. The process was invented by Theodor Kleinert in 1968 as an environmentally benign alternative to kraft pulping. Organosolv has several advantages when compared to other popular methods such as kraft or sulfite pulping. In particular, the ability to obtain relatively high quality lignin adds value to a process stream otherwise considered as waste. Organosolv solvents are easily recovered by distillation, leading to less water pollution and elimination of the odour usually associated with kraft 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pulp (paper)
Pulp is a lignocellulosic fibrous material prepared by chemically or mechanically separating cellulose fibers from wood, fiber crops, waste paper, or rags. Mixed with water and other chemical or plant-based additives, pulp is the major raw material used in papermaking and the industrial production of other paper products. History Before the widely acknowledged invention of papermaking by Cai Lun in China around 105 AD, paper-like writing materials such as papyrus and amate were produced by ancient civilizations using plant materials which were largely unprocessed. Strips of bark or bast material were woven together, beaten into rough sheets, dried, and polished by hand. Pulp used in modern and traditional papermaking is distinguished by the process which produces a finer, more regular slurry of cellulose fibers which are pulled out of solution by a screen and dried to form sheets or rolls. The earliest paper produced in China consisted of bast fibers from the paper mulberr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kraft Pulping
The kraft process (also known as kraft pulping or sulfate process) is a process for conversion of wood into wood pulp, which consists of almost pure cellulose fibres, the main component of paper. The kraft process involves treatment of wood chips with a hot mixture of water, sodium hydroxide (NaOH), and sodium sulfide (Na2S), known as white liquor, that breaks the bonds that link lignin, hemicellulose, and cellulose. The technology entails several steps, both mechanical and chemical. It is the dominant method for producing paper. In some situations, the process has been controversial because kraft plants can release odorous products and in some situations produce substantial liquid wastes. 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. History A precursor of the Kraft process was used during the Napoleonic Wars in England. The kraft process (so called because of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Enterobacter Aerogenes
''Klebsiella aerogenes'', previously known as ''Enterobacter aerogenes,'' is a Gram-negative, oxidase negative, catalase positive, citrate positive, indole negative, rod-shaped bacterium. The bacterium is approximately 1-3 microns in length, and is capable of motility via peritrichous flagella. ''Klebsiella aerogenes'' is a nosocomial and pathogenic bacterium that causes opportunistic infections including most types of infections. The majority are sensitive to most antibiotics designed for this bacteria class, but this is complicated by their inducible resistance mechanisms, particularly lactamase, which means that they quickly become resistant to standard antibiotics during treatment, requiring a change in antibiotic to avoid worsening of the sepsis. Some of the infections caused by ''K. aerogenes'' result from specific antibiotic treatments, venous catheter insertions, and/or surgical procedures. ''K. aerogenes'' is generally found in the human gastrointestinal tract and does ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Papermaking
Papermaking is the manufacture of paper and cardboard, which are used widely for printing, writing, and packaging, among many other purposes. Today almost all paper is made using industrial machinery, while handmade paper survives as a specialized craft and a medium for artistic expression. In papermaking, a dilute suspension consisting mostly of separate cellulose fibres in water is drained through a sieve-like screen, so that a mat of randomly interwoven fibres is laid down. Water is further removed from this sheet by pressing, sometimes aided by suction or vacuum, or heating. Once dry, a generally flat, uniform and strong sheet of paper is achieved. Before the invention and current widespread adoption of automated machinery, all paper was made by hand, formed or laid one sheet at a time by specialized laborers. Even today those who make paper by hand use tools and technologies quite similar to those existing hundreds of years ago, as originally developed in China and other ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wausau, Wisconsin
Wausau ( ) is a city in and the county seat of Marathon County, Wisconsin, United States. The Wisconsin River divides the city into east and west. The city's suburbs include Schofield, Weston, Mosinee, Maine, Rib Mountain, Kronenwetter, and Rothschild. As of the 2020 census, Wausau had a population of 39,994. It is the core city of the Wausau Metropolitan Statistical Area (MSA), which includes all of Marathon County and had a population of 134,063 at the 2010 census. History Founding This area has for millennia changed hands between various indigenous peoples. The historic Ojibwe (also known in the United States as the Chippewa) occupied it in the period of European encounter. They had a lucrative fur trade for decades with French colonists and French Canadians. After the French and Indian War this trade was dominated by British-American trappers from the eastern seaboard. The Wisconsin River first drew European-American settlers to the area during the mid-19th centur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miramichi, New Brunswick
Miramichi () is the largest city in northern New Brunswick, Canada. It is situated at the mouth of the Miramichi River where it enters Miramichi Bay. The Miramichi Valley is the second longest valley in New Brunswick, after the Saint John River (Bay of Fundy), Saint John River Valley. Neighbourhoods The city of Miramichi was formed in 1995 through the forced Municipal amalgamations in New Brunswick, amalgamation of two towns, Newcastle, New Brunswick, Newcastle and Chatham, New Brunswick, Chatham, and several smaller communities, including Douglastown, New Brunswick, Douglastown, Loggieville, New Brunswick, Loggieville, and Nelson-Miramichi, New Brunswick, Nelson. Also the local service districts of Nordin, New Brunswick, Nordin, Moorefield, New Brunswick, Moorefield, Chatham Head, New Brunswick, Chatham Head, and Douglasfield, New Brunswick, Douglasfield. The amalgamation also included portions of the former local service district of Ferry Road-Russellville (Now separated and m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Froth Flotation
Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic. This is used in mineral processing, paper recycling and waste-water treatment industries. Historically this was first used in the mining industry, where it was one of the great enabling technologies of the 20th century. It has been described as "the single most important operation used for the recovery and upgrading of Sulfide#Geology, sulfide ores". The development of froth flotation has improved the recovery of valuable minerals, such as copper- and lead-bearing minerals. Along with mechanized mining, it has allowed the economic recovery of valuable metals from much lower grade ore than previously. Industries Froth flotation is applied to a wide range of separations. An estimated 1B tons of materials are processed in this manner annually. Mineral processing Froth flotation is a process for separating minerals from gangue by exploiting differences in their hydrophobicity. Hydrophob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centrifugation
Centrifugation is a mechanical process which involves the use of the centrifugal force to separate particles from a solution according to their size, shape, density, medium viscosity and rotor speed. The denser components of the mixture migrate away from the axis of the centrifuge, while the less dense components of the mixture migrate towards the axis. Chemists and biologists may increase the effective gravitational force of the test tube so that the precipitate (pellet) will travel quickly and fully to the bottom of the tube. The remaining liquid that lies above the precipitate is called a supernatant or supernate. There is a correlation between the size and density of a particle and the rate that the particle separates from a heterogeneous mixture, when the only force applied is that of gravity. The larger the size and the larger the density of the particles, the faster they separate from the mixture. By applying a larger effective gravitational force to the mixture, like a ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Filtration
Filtration is a physical separation process that separates solid matter and fluid from a mixture using a ''filter medium'' that has a complex structure through which only the fluid can pass. Solid particles that cannot pass through the filter medium are described as ''oversize'' and the fluid that passes through is called the ''filtrate''. Oversize particles may form a filter cake on top of the filter and may also block the filter lattice, preventing the fluid phase from crossing the filter, known as ''blinding''. The size of the largest particles that can successfully pass through a filter is called the effective ''pore size'' of that filter. The separation of solid and fluid is imperfect; solids will be contaminated with some fluid and filtrate will contain fine particles (depending on the pore size, filter thickness and biological activity). Filtration occurs both in nature and in engineered systems; there are biological, geological, and industrial forms. Filtration is als ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theodor Kleinert
Theodor is a masculine given name. It is a German form of Theodore. It is also a variant of Teodor. List of people with the given name Theodor * Theodor Adorno, (1903–1969), German philosopher * Theodor Aman, Romanian painter * Theodor Blueger, Latvian professional ice hockey forward for the Pittsburgh Penguins of the National Hockey League (NHL) * Theodor Burghele, Romanian surgeon, President of the Romanian Academy * Theodor Busse, German general during World War I and World War II * Theodor Cazaban, Romanian writer * Theodor Fischer (fencer), German Olympic épée and foil fencer * Theodor Fontane, (1819–1898), German writer * Theodor Geisel, American writer and cartoonist, known by the pseudonym Dr. Seuss * Theodor W. Hänsch (born 1940), German physicist * Theodor Herzl, (1860–1904), Austrian-Hungary Jewish journalist and the founder of modern political Zionism * Theodor Heuss, (1884–1963), German politician and publicist * Theodor Innitzer, Austrian Catholic car ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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