A method for wood acetylation and co-production of acetate

Abstract

The invention discloses a wood acetylation and acetate cooperative production method. The technological process that a byproduct of acetic acid is subjected to rectification separation in a traditional wood acetylation process so as to be cycled to be used for acetic anhydride reproduction is changed. A wood acetylation technology is innovatively combined with an esterifying acetate preparing technology, the byproduct of acetic acid in the wood acetylation process is moved out through continuous rectification, the acetylation reaction speed is increased, the use amount of acetic anhydride is obviously reduced, meanwhile, the energy generated in the process of moving out the byproduct of acetic acid through rectification is fully utilized and reacts with low-carbon alcohol to be prepared into an acetate product, so that cooperative production of acetylation wood and an acetate product is achieved, the production technological processes are optimized and completed, product structures are enriched, the additional value of the byproduct of acetic acid is improved, and the production cost of the acetylation wood and the acetate is obviously reduced. In addition, the wood acetylation and acetate cooperative production method is simple and easy to implement and can be easily used for industrial application.

Description

technical field [0001] The invention relates to a method for wood acetylation and co-production of acetate, belonging to the technical field of acetylated wood preparation. Background technique [0002] Wood is the material with the longest history among the four major building materials (steel, cement, plastic, and wood) in the world today, and it is also the only natural biological material that is renewable, recyclable, and naturally degradable. my country is one of the countries lacking in forests and materials, and the supply of timber depends heavily on imports. At present, my country's timber consumption is nearly 500 million cubic meters per year, and the dependence on foreign countries is as high as 50%. By 2020, my country's timber demand will reach about 800 million cubic meters per year. year. As the contradiction between the effective supply of forests in my country and the growing social demand continues to intensify, the dependence on foreign timber in my coun...

AI Technical Summary

Problems solved by technology

[0010] In order to speed up the acetylation reaction rate and ensure the wood weight gain rate in the final product, an excess of acetic anhydride is usually required to participate in the reaction, which in turn leads to increased energy consumption and cost in the subsequent rectification and separation of unreacted acetic anhydride and by-product acetic acid

On the other hand, the wood acetylation process is complex and requires high corrosion resistance of equipment, resulting in high cost and price of acetylated wood despite its excellent performance. Added value of the product acetic acid, a new technological process to reduce the cost of acetylated wood

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