A METHOD FOR PRODUCING A CHEMI-THERMOMECHANICAL FIBROUS PULP FROM NON-WOOD PLANT RAW MATERIALS AND AN AUTOMATED LINE FOR PRODUCING SAID PULP BY SAID METHOD
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United States of America Patent
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Sep 19, 2024
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Mar 22, 2023
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Mar 23, 2022
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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.
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