Preparation method of a biodegradable lignin-based microporous molecular sieve with high oil absorption rate

Abstract

The invention discloses a preparation method of a high-oil-absorption and biodegradable lignin-based microporous molecular sieve. The method can be used for synthesizing a high-oil-absorption and biodegradable lignin-based microporous molecular sieve, and is simple in preparation process. The method comprises the following steps: 1) synthesis of acetyl lignin: dissolving lignin in a mixing liquid of pyridine and an organic solvent, dropwise adding an acetic anhydride reagent so that an acetylation reaction is achieved between the alcoholic hydroxyl group in the lignin and acetic anhydride, so as to obtain the acetyl lignin; 2) synthesis of silyl acetyl lignin: dissolving the acetyl lignin in a mixing liquid of pyridine and triethoxy chlorosilane so that a synthesis reaction is achieved between the phenolic hydroxyl group in the acetyl lignin and triethoxy chlorosilane, so as to obtain the silyl acetyl lignin; and 3) preparing the microporous molecular sieve by virtue of copolymerization: adding the silyl acetyl lignin to a microporous molecular sieve suspension dissolved in the organic solvent for copolymerization, thus obtaining a solid matter which is the high-oil-absorption and biodegradable lignin-based microporous molecular sieve.

Description

Technical field [0001] The invention relates to a method for preparing molecular sieve, and more specifically to a method for preparing biodegradable lignin-based microporous molecular sieve with high oil absorption. Background technique [0002] Lignin is a kind of complex polycyclic structure, three-dimensional network polymer organic matter (see the following structural formula, referred to as LIG). There are functional groups such as alcoholic hydroxyl (a), phenolic hydroxyl (b) and carboxyl on the molecule, which is beneficial to the modification of polymer structure. . In nature, the reserves of lignin are second only to cellulose, and it is regenerated at a rate of tens of billions of tons every year. The pulp and paper industry needs to separate about 150 million tons of cellulose from plants every year, and at the same time obtain about 50 million tons of lignin by-products, but so far, more than 90% of lignin is directly discharged into rivers as "black liquor". Cause...

AI Technical Summary

Problems solved by technology

Conventional resin oil-absorbing materials are acrylic resins and olefin resin materials, and their structures are characterized by low three-dimensional network chemical cross-linking structures. There is a problem of competitive adsorption between water and oil in the treatment of oil pollution on the sea surface caused by oil spills from tankers. , resulting in mutual interference of water absorption and oil absorption

Microporous molecular sieves can be used to solve the problem of oil absorption on the sea surface due to their advantages such as regular pores and controllable pore size distribution. However, because the surface is mainly composed of hydrophilic groups, the primary oil absorption rate is not high.

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