Method for continuously preparing alkenyl succinic anhydride by microchannel reactor

Abstract

The invention provides a method for continuously preparing alkenyl succinic anhydride by a micro-channel reactor, wherein hot-melted maleic anhydride and internal olefin react in the micro-channel reactor to obtain alkenyl succinic anhydride. According to the invention, the method for continuously preparing alkenyl succinic anhydride by using the microchannel reactor replaces a dropwise adding reaction in the prior art, so that the whole reaction is continuous and efficient; a fluid in the micro-channel reactor forms local vortex collision by means of diffusion and structural design, so that two raw materials are fully mixed for mass transfer, the reaction efficiency is improved, and the mass transfer and heat transfer efficiency and the mixing capacity can accurately control the reaction temperature and the retention time; higher reaction efficiency can be achieved by utilizing the micro-channel reactor without adding a catalyst, so that a subsequent catalyst recovery process is omitted; and continuous reaction and DCS control can be realized by utilizing the micro-channel reactor, manual operation is reduced, manpower is saved, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of compound synthesis, in particular to a method for continuously preparing alkenyl succinic anhydride in a microchannel reactor. Background technique [0002] Alkenyl succinic anhydride (ASA for short) is a basic raw material widely used in light industry and fine chemical industry. It is widely used in lubricating oil, waterproofing agent, hardener, desiccant, preservative, especially in papermaking with reactive sizing agent. In the field of production, it has the ability to react quickly with cellulose, which can greatly improve the tensile strength of paper, waterproof performance, whiteness, opacity, abrasion resistance and improve the chemical environment of the papermaking process. ASA is an oily amber liquid at room temperature, composed of unsaturated olefin skeleton linked with succinic anhydride, the molecular structure contains two hydrophobic groups and reactive anhydride groups. [0003] The ...

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Problems solved by technology

[0003] The preparation of ASA usually adopts the mode of dropping maleic anhydride to prepare under higher temperature conditions with the isomeric olefin raw material in the tank reactor. 4-6h; (2) solid catalyst needs to be added in the preparation process to accelerate the reaction, and in the purification process, it is necessary to increase the process of removing the catalyst; (3) batch reaction of kettle reaction, the production cycle time is long, and cannot be carried out continuously; (4 ) There are many devices in the dripping process, the corresponding sections and pipelines are relatively long, the equipment covers a large area, and its energy loss and material loss are also large; (5) The level of self-control is low

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