A CONTINUOUS PROCESS FOR PRODUCTION OF CELLULOSE PULP FROM GRASSY RAW MATERIALS

The present invention discloses an improved continuous process for the production of cellulose from grass raw materials based on: (i) cooking chopped grass raw materials in white liquor with a composition of 0.5-2.0% w / w NaOH and 0.5-25， 0% w / w NaCl at 95-100 [deg.] C. (ii) bleaching process of brown cellulose in white liquor of the same composition with oxygen (O <SUB> 2 </SUB>) and chlorine (Cl <SUB> 2 </SUB>) at 70-100 <SUP> o </SUP> C to give bleached cellulose pulp; wherein， (iii) lignin and other by-products are separated by continuous electrolysis whereby white lye is regenerated and O <SUB> 2 </SUB> and Cl <SUB> 2 </SUB> products are simultaneously produced for bleaching purposes closing the cycle of the process. <BR/> <BR/> By applying defibering with a mill and separation of black liquor or waste solution from the bleaching process during the cooking or bleaching process， efficient processing of grass raw material or brown cellulose is achieved， which enables obtaining cellulose pulp of very high quality. The process allows the processing of various grass raw materials such as stalks and leaves of sorghum (Sorghum species， Linne) or corn (Zea mays， Linne) .The present invention discloses an improved continuous production process of cellulose pulp from grass raw materials based on: <BR/> (i) cooking of chipped grass raw materials in a white liqour of 0.5-2.0% m / m NaOH and 0.5 -25.0% m / m NaCl at 95-100 ° C; <BR/> (ii) the process of bleaching brown cellulose in a white liqour of the same composition with oxygen (O2) and chlorine (Cl2) at 70-100 ° C C， to obtain a bleached cellulose pulp; whereby， <BR/> (iii) lignin and other byproducts are separated by continuous electrolysis， whereby white liqour is regenerated and O2 and Cl2 are produced for bleaching purposes， closing the process cycle. <BR/> <BR/> By application of defibration by a mill and black liqour separation or waste solution from the bleaching process during the cooking or bleaching process， it is possible to efficiently treat grass raw material or brown cellulose， which makes it possible to obtain high quality cellulose pulp. The process allows for processing of various grassy raw materials such as stalk and leaves of sorghum (Sorghum species， Linne) or corn (Zea mays， Linne).