Microwave-assisted preparation method of bagasse bleached pulp

Abstract

The invention discloses a microwave-assisted preparation method of bagasse bleached pulp, which is a method for clean and high-efficient preparation of bagasse bleached pulp by microwave radiation technology. The method comprises: performing microwave heating and water extracting treatment of air-dried bagasse raw materials, repeatedly soaking and cleaning the treated materials with deionized water to be neutral, then performing dehydration and dispersion, rapidly determining the water content of the dispersed materials, then performing delignification treatment of the materials with a known water content by sodium hydroxide / hydrogen peroxide / anthraquinone, finally soaking, dispersing and washing the treated pulp to be neutral, removing excessive water, and sealing to obtain the bagasse bleached pulp. The bagasse bleached pulp prepared by the method is milk white or in a white fiber form, low in paper pulp kappa number, high in whiteness, and moderate in viscosity.

Description

technical field [0001] The invention relates to a method for cleanly and efficiently preparing bleached pulp by using bagasse, a solid waste after sugar extraction, as a raw material, and belongs to the technical field of pulp and papermaking. Background technique [0002] With the rapid development of the pulp and paper industry, the supply of wood fiber raw materials is increasingly in short supply. In addition to vigorously developing "forest-paper integration", making full use of non-wood raw materials is an important way to develop the paper industry. Bagasse is the solid residue of fibrous cells and miscellaneous cells (mostly parenchyma cells) left after sugar cane is squeezed, referred to as bagasse. Yunnan, the second largest sugar-producing province in China, produces about 1.7 million tons of bagasse a year [1] . According to the literature records, due to the suitable aspect ratio of bagasse fibers after removing pith, the similar pulping properties to wood pul...

AI Technical Summary

Problems solved by technology

But unfortunately, the use of microwaves for pulping and bleaching is still carried out according to the traditional multi-step process. For example, plant raw materials are chemically pulped by microwaves to obtain natural color pulp [7] ; In the microwave bleaching process, it is often to improve the technology of a certain bleaching process, and the bleaching object is mostly the natural color paste of a certain plant [8-10] , and the technology of directly preparing bleached pulp by using microwave heating technology with plant raw materials as the research object has not been reported yet.