초록 ▼

A continuous process for effecting the acid hydrolysis of cellulosic waste materials, at high solids and in a most economically desirable manner. The process may be controlled to produce, as primary products, glucose, furfural and/or xylose. By appropriate control of water and temperature, through t

A continuous process for effecting the acid hydrolysis of cellulosic waste materials, at high solids and in a most economically desirable manner. The process may be controlled to produce, as primary products, glucose, furfural and/or xylose. By appropriate control of water and temperature, through the use of direct steam injection, high solids feedstocks may quickly be converted, in good yields, to valuable products, thus making the process very attractive from a practical commercial standpoint.

대표청구항 ▼

A continuous process for the saccharification of cellulosic materials, comprising the steps of: (a) substantially continuously introducing into one end of a tubular reactor an aqueous mixture of cellulosic material containing from about 15 to about 45 weight percent solids, and constricting the othe

A continuous process for the saccharification of cellulosic materials, comprising the steps of: (a) substantially continuously introducing into one end of a tubular reactor an aqueous mixture of cellulosic material containing from about 15 to about 45 weight percent solids, and constricting the other end of said reactor so as to develop a back pressure therein; (b) admixing a strong mineral acid with said material in a concentration appropriate to catalyze the hydrolysis thereof; (c) substantially continuously injecting steam into said mixture, at a location downstream from said one end of said reactor, to produce a reaction mass containing about 10 to about 25 weight percent solids, said steam being injected in an amount sufficient to maintain the temperature of said reaction mass at about 160°Centigrade to about 250°Centigrade, and to thereby effect hydrolysis of said material in the presence of said acid, the solids content of said reaction mass being about 50 to 85 percent of that of said mixture; (d) thereafter, substantially continuously passing said reaction mass into and through a reaction zone of said reactor located downstream from the steam injection location, the length of said reaction zone and the rate of mixture introduction being so selected as to afford an average residence time of about one to ten minutes for each increment of said mass in said zone, and said back pressure therewithin being about 90 to 400 pounds per square inch, gauge; and (e) substantially continuously discharging said mass from said reactor, and recovering products of saccharification therefrom.