2results about "Finely-divided material pretreatment" patented technology

This invention provides a method for processing raw materials for enzymatic hydrolysis to produce lignocellulose, comprising the following steps: (1) heat-treating the lignocellulose-containing raw material; (2) selectively oxidizing and refining the heat-treated raw material; and (3) drying the selectively oxidized and refined raw material. This invention can increase the porosity of lignocellulose without increasing the refining intensity, and reduce pore closure caused by cellulose cutinization during the drying process after refining. It can produce lignocellulose materials with higher porosity, thereby producing lignocellulose materials with higher accessibility and reactivity.

A process to manufacture dissolving pulp grade cellulose said process comprising the steps of: o providing a lignocellulosic material; o optionally, comminuting said lignocellulosic material into chips of a particle size no greater than 5 cm o providing a modified Caro's acid, wherein said modified Caro's acid o exposing said lignocellulosic material to said modified Caro's acid at a temperature of less than or equal to 45°C for a period of time sufficient to allow the modified Caro's acid to delignify said lignocellulosic material and yield a solid cellulosic portion and a liquid portion with a high dissolved lignin content; o separating said solid cellulosic portion from said liquid portion; wherein said solid cellulosic portion has the following characteristics: o lignin content below 1%; o hemicellulose content below 15%; and o cellulose content of at least 75%; - exposing said solid cellulosic portion to a caustic solution yielding causticized solids; - filtering said causticized solids; - re-slurrying said causticized solids and neutralizing such to yield a dissolving pulp cellulose; and - washing said dissolving pulp cellulose with water to remove the neutralized salts to obtain a high purity dissolving pulp cellulose having the following characteristics: o over 90% cellulose content; o less than 1% lignin content; o less than 5% hemicellulose content; and o an intrinsic viscosity ranging between 100 – 800 mL / g.