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| Soda pulping ： ウィキペディア英語版 |
Soda pulping
Soda pulping is a chemical process for making wood pulp with sodium hydroxide as the cooking chemical. In the ''Soda-AQ'' process, anthraquinone (AQ) may be used as a pulping additive to decrease the carbohydrate degradation. The soda process gives pulp with lower tear strength than other chemical pulping processes (sulfite process and kraft process), but has still limited use for easy pulped materials like straw and some hardwoods.
==History==
Soda pulping was one of the first chemical pulping methods and was invented in 1851 by Burgess (USA) and Watts (England). The first mill was started in 1860 in the USA. In 1865 they patented a method for recovery of the cooking liquors by incineration of the spent liquor. Many of the early soda mills converted to kraft mills once it was discovered.〔.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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