A system for continuously preparing polyoxymethylene dimethyl ether with methanol as the initial reaction raw material

Abstract

The invention discloses a system for continuously preparing polymethoxy dimethyl ether by using methanol as an initial reaction raw material, which mainly comprises a formaldehyde preparation unit, a methylal preparation unit and a polymethoxy dimethyl ether preparation unit, wherein the formaldehyde preparation unit is mainly used for oxidizing the raw material methanol into a formaldehyde solution under the action of a catalyst; the methylal preparation unit is used for reacting part of the formaldehyde solution with methanol under the action of a solid acidic resin catalyst to prepare methylal; and the polymethoxy dimethyl ether preparation unit is used for respectively carrying out condensation reaction on the methanol and methylal with the formaldehyde solution under the action of an ionic liquid catalyst to prepare the polymethoxy dimethyl ether, and separating and purifying the reaction product to obtain the polymethoxy dimethyl ether product. Compared with the trioxymethylene or oligomer formaldehyde route, the system has the advantages of simple process and low energy consumption, is simple to operate, implements recovery treatment of sewage on the premise of cyclic recovering the intermediate product, and thus, is very suitable for large-scale industrial production.

Description

technical field [0001] The invention discloses a process device system for continuously preparing polyoxymethylene dimethyl ether by using methanol as an initial reaction raw material. Background technique [0002] With the dwindling of oil resources and the increasing demand for fuel oil in various countries around the world, all countries have intensified their efforts in research and development of new energy sources. [0003] With the rapid development of the economy and the continuous improvement of people's living standards, my country's demand for oil continues to increase. Due to the lack of resources, China has changed from a net exporter to a net importer in 1993, and its dependence on foreign countries has increased year by year. In 2012, it has exceeded 55%. %. Petroleum resources have become one of the most sensitive and weakest links affecting economic operation. In recent years, with the rapid growth of the number of motor vehicles, the consumption of oil pro...

AI Technical Summary

Problems solved by technology

In the 1990s, due to the oil crisis, coal-to-oil and methanol-to-olefins technologies were developed, but due to the utilization rate of raw materials being less than 45%, high energy consumption, and a large amount of water consumption, its technological development and industrial application have been greatly hindered. limit

This method has low catalyst activity, complicated process, and is difficult to realize industrialization

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