Patent ID: 7981337

Claim:
A method for pilot-scale production of cellulose products, comprising: (a) pre-cooling a mixed aqueous solution of sodium hydroxide and thiourea to a first temperature; (b) placing the pre-cooled mixed aqueous solution at a second temperature, and then immediately adding a cellulose raw material and dissolving under sufficient agitation to obtain a cellulose solution; (c) filtering and deaerating said cellulose solution; (d) using a molding device for pilot-scale production to process the filtered and deaerated cellulose solution to form a cellulose product, said molding device being a two-step coagulation bath spinning device, wherein said two-step coagulation bath spinning device comprises a first coagulation bath and a second coagulation bath, wherein said first coagulation bath is a mixed aqueous solution of H 2 SO 4 and Na 2 SO 4 , wherein the concentration of H 2 SO 4 is 5 wt % to 20 wt %, and the concentration of Na 2 SO 4 is 5 wt % to 25 wt %, and the bath temperature is 0 to 40° C., and said second coagulation bath is an aqueous solution of 3 wt % to 20 wt % H 2 SO 4 , and the bath temperature is 0 to 50° C.