30 results about "Methylrhenium trioxide" patented technology

The invention discloses a method for catalytically depolymerizing lignin by using MTO (Methyltrioxorhenium) under a microwave promoted condition, and relates to a novel method for converting a lignin beta-O-4 model compound and a lignin raw material into a corresponding aromatic compound under a microwave irradiation condition by taking the MTO as a catalyst and ionic liquid as a reaction medium. The method comprises the following steps: adding the catalyst and a lignin oligomer in the ionic liquid, preheating and dissolving, feeding into a microwave reaction system, reacting for two minutes under the microwave irradiation condition, and efficiently and quickly depolymerizing the lignin, thus obtaining a monophenol compound. Compared with a traditional lignin depolymerization method, the method has the distinct characteristics that additional addition of a hydrogen source and an oxygen source is not required, the reaction condition is mild, the selectivity of monophenol products is high, the reaction speed is fast, and environment friendliness is realized. According to the method disclosed by the invention, a mild depolymerization strategy without consuming the hydrogen source is developed for preparation of aromatic chemicals by starting from a reproducible lignin resource, and meanwhile, a new path is developed for producing the aromatic compound through a non-petroleum route.

The invention provides a process for synthesizing methyltrioxorhenium from perrhenates, which comprises oxidizing rhenium metallic powder with nitric acid to obtain perrhenic acid, reacting with water-soluble metal salts to obtain silver perrhenate or potassium perrhenate or barium perrhenate, then reacting perrhenates with trimethylchlorosilan and tetramethylstannane to obtain MTO, finally carrying out post-treatment to obtain high purity MTO.