US 12,753,283 B2Granted

Method for producing stabilized lignin having a high specific surface area

AssigneeSuncoal Industries GmbH

InventorsAlexander Stücker, Jacob Podschun, Tobias Wittmann, Lenz Aron Mathis Köhl

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Abstract

The present invention relates to a method for producing lignin in particle form from a liquid containing lignin-containing raw material, the method comprising at least: reacting the liquid with a cross-linking agent (step a)), precipitating the lignin, thereby forming lignin particles in the liquid (step b)), and separating the liquid from the lignin particles formed in step b) (step c)), and wherein, in step b), the liquid is heat-treated, after precipitation, at a temperature in the range of 60 to 200° C. for a period of 1 minute to 6 hours, and/or, in an additional step d) after step c), the lignin particles separated from the liquid are heat-treated at a temperature in the range of 60 to 600° C. The invention also relates to lignin particles which can be obtained according to the method, lignin particles per se, a use of the lignin particles as filler, and a rubber composition comprising, inter alia, a filler component, the latter containing lignin particles as a filler.

Claims13

Dependent claims

A method for producing a lignin in particulate form from a liquid containing a lignin-containing raw-material, wherein the lignin is at least in part dissolved in the liquid, wherein the process comprises the following steps:

(a) reacting lignin dissolved in the liquid with at least one cross-linking agent in the liquid at a temperature in a range from 60 to 180° C. and at a pH value of the liquid in a range from 7 to 14 in order to obtain modified lignin dissolved in the liquid,
(b) precipitating the dissolved modified lignin obtained in step (a) by mixing the liquid with a precipitating agent at a temperature in a range from 0 to below 150° C. with the formation of lignin particles in the liquid, and
(c) separating the liquid from the lignin particles formed in step (b),
wherein
in step (b) the liquid mixed with the precipitating agent is heat-treated after the precipitation at a temperature in a range from 60 to 200° C. for a period of 1 minute to 6 hours, and/or
in an additional step (d) after step (c), the lignin particles separated from the liquid are heat-treated at a temperature in the range from 90 to 600° C.

3 more elements

Dependencies are inferred from the claim text.