ALCELL process

In the ALCELL process, conventional hardwood chips are cooked in batch extractors with an aqueous ethanol liquor at appropriate temperatures, pH, and time. In the process lignin, hemicellulose and other various components of wood are extracted from the chips into the aqueous ethanol forming a black liquor. 

Pye EK and Lora JH (1991) The Alcell process proven alternative to kraft pulping. TAPPI, 74(3), 113-8... 

The ALCELL process, a proprietary organosolv pulping process, produces a novel lignin by-product. This lignin has many physical and chemical properties which distinguish it from lignins produced by the kraft and sulfite processes. It has a low molecular weight (M 1000),... 

Alcell [Alcohol cellulose] A process for delignifying wood pulp by dissolving it in aqueous ethanol at high temperature and pressure. Developed by Repap Technologies, United States. 

A demonstration plant, producing 15 metric tons of organosolv pulp a day, was constructed in New Brunswick, Ontario. A comparison of the strength properties of Alcell and kraft pulps is given in Table 28.5. The process as described above is only suitable for hard-woods.8,22... 

Thring RW, Katikaneni SPR, Bakhshi NN (2000) The production of gasoline range hydrocarbons from Alcell (R) lignin using HZSM-5 catalyst. Fuel Process Technol 62 17... 

More recently, this process has been revisited by us in a broader context, particularly in terms of the variety of substrates examined [6, 7]. In this comprehensive study, we called upon kraft (KL), ALCELL organosolv (OL), soda (SL) and an oxygen organosolv lignin (OOL). The relevant properties of these substrates are given in Table 12.1. 

---