Abstract

A method for producing a chemi-thermomechanical fibrous pulp from non-wood plant raw materials, the method comprises steps of preliminary preparing leaves, chemi-thermomechanical treating the preliminary prepared raw materials, grinding a semi-fibrous and partially delignified pulp to produce the chemi-thermomechanical fibrous pulp, wherein the preliminary preparation of the initial raw materials further comprises pressing shredded leaves, plasticizing and softing of the preliminary prepared leaves is performed by their mechanical rubbing and treating with a pressurized heated vapor, delignifying of the plasticized and soft raw materials is performed by their pressurized mixing at a pressure of at least 3.5 atms at a temperature from 70 to 120° C. in a presence of an alkali metal hydroxide or in a form of a solution or an aerosol having an alkali concentration of 3% at most, and the grinding is performed in a presence of acetic acid of a concentration of 3% at most.

IPC Classes  ?

• D21H 11/02 - Chemical or chemomechanical pulp
• D21B 1/12 - Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods by the use of steam
• D21C 1/02 - Pretreatment of the finely-divided materials before digesting with water or steam
• D21C 1/06 - Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
• D21C 1/10 - Physical methods for facilitating impregnation
• D21C 3/02 - Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
• D21H 11/08 - Mechanical or thermomechanical pulp
• D21H 11/12 - Pulp from non-woody plants or crops, e.g. cotton, flax, straw or bagasse

Abstract

A method for producing a chemi-thermomechanical fibrous pulp from non-wood plant raw materials, the method comprises steps of preliminary preparing leaves, chemi-thermomechanical treating the preliminary prepared raw materials, grinding a semi-fibrous and partially delignified pulp to produce the chemi-thermomechanical fibrous pulp, wherein the preliminary preparation of the initial raw materials further comprises pressing shredded leaves, plasticizing and softing of the preliminary prepared leaves is performed by their mechanical rubbing and treating with a pressurized heated vapor, delignifying of the plasticized and soft raw materials is performed by their pressurized mixing at a pressure of at least 3.5 atms at a temperature from 70 to 120°C in a presence of an alkali metal hydroxide or in a form of a solution or an aerosol having an alkali concentration of 3% at most, and the grinding is performed in a presence of acetic acid of a concentration of 3% at most.

IPC Classes  ?

• D21B 1/12 - Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods by the use of steam
• D21C 1/02 - Pretreatment of the finely-divided materials before digesting with water or steam
• D21C 1/06 - Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
• D21C 1/10 - Physical methods for facilitating impregnation
• D21C 3/02 - Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
• D21H 11/02 - Chemical or chemomechanical pulp
• D21H 11/08 - Mechanical or thermomechanical pulp
• D21H 11/12 - Pulp from non-woody plants or crops, e.g. cotton, flax, straw or bagasse

Abstract

A method of obtaining a chemical-thermomechanical fibrous mass (CTFM) from plant raw materials with forming an automated plant processing line, wherein providing the plan raw material plastification by mechanical interaction of the plant raw material particles under conditions of high pressure and temperature by a hydrothermal impregnation. Saturating with alkali an obtained thermomechanical plasticized mass (TPM) by using a chemical- thermomechanical chamber without pressure. Performing a stepwise dewaxing with neutralization of an alkali, and precipitating of a residual lignin in a solution of a low concentrated acetic acid, bleaching of the CTFM by using an acetic acid.

IPC Classes  ?

• D21C 1/02 - Pretreatment of the finely-divided materials before digesting with water or steam
• D21C 1/06 - Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
• D21C 3/02 - Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
• D21C 9/16 - Bleaching with per compounds
• D21H 11/08 - Mechanical or thermomechanical pulp
• D21H 11/12 - Pulp from non-woody plants or crops, e.g. cotton, flax, straw or bagasse