Abstract
The article is devoted to the history of the development of wood delignification methods in order to obtain cellulose. A brief description of their use in paper production has been given since its inception. The technologies of sodium, sulfate and sulfite delignification of wood are described in detail. The development of methods of bleaching and ennobling of technical pulps, improvement of their hardware design and their influence on the quality of finished products is shown. The dynamics of the pulp industry development in the leading countries of the world, its current state and development prospects are given. This article is the fourth part of the cycle «Wood as a chemical raw material. History and modernity»; the first, second and third parts are published in the journal Forest Bulletin, 2020, vol. 24, No. 1, No. 5 and 2021, vol. 25, No. 3.
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