The above method has formed large-scale production equipment in Europe, America, Japan and other places in the 1970s, and has obvious advantages in production cost and environmental protection. In the 1990s, my country had just achieved 10,000-ton industrialization on the basis of intermediate experiments, so there was still a gap between the technical indicators and foreign levels.
This method does not have the azeotropic problem of a large amount of water, and it is easy to obtain high-grade products with a purity of more than 99.5%. Therefore, compared with the direct esterification method, the method has the following advantages: mild reaction conditions, high reaction conversion rate and ethyl acetate yield, low raw material costs, and obvious economic benefits, but the method has the following disadvantages: First, the preparation of the catalyst The technical difficulty is greater and it is easily hydrolyzed in water; the second is that the reaction is exothermic and needs to be cooled with ice brine at a lower temperature.