MMA washing tower acidity removing method and device applied to same

Abstract

The invention relates to an MMA washing tower acidity removing method. The method comprises the following steps of 1, preparing ethidene diamine solution with the concentration of 9%-12% through a liquid inlet device; 2, conveying the ethidene diamine solution into backflow fluid at the top of an MMA washing tower, controlling the flow of the ethidene diamine solution to be 0.4%-0.6% of the amount of backflow fluid at the top of the MMA washing tower, and enabling ethidene diamine to generate neutral reaction with MAA in the backflow fluid; 3, enabling a neutral reaction product in the step 2 to flow back to an esterification reactor and restoring MAA from the neutral reaction product through sulfuric acid solution. The MMA washing tower acidity removing method and a device applied to the method can improve the MAA removing efficiency, solve the problem of the MMA washing tower polymerization halt production caused by over-standard MAA content and reduce operation cost.

Description

technical field [0001] The invention belongs to the field of MMA manufacture, and relates to a cleaning method and device for an MMA washing tower, in particular to a method for eliminating the acidity of an MMA washing tower and a device used in the method. Background technique [0002] Domestic similar MMA (methyl methacrylate) devices are all equipped with MMA scrubbers, the main purpose of which is to eliminate MAA (methacrylic acid) in the esterification gas phase gas. The existing MMA scrubber acidity elimination method mainly uses esterification The gas phase condensate is refluxed or extracted water is added to the top of the tower as the feed to the top of the MMA scrubber, and it is in countercurrent contact with the rising esterification gas phase at the bottom of the MMA scrubber to perform mass transfer and heat transfer to reduce the MAA in the gas phase at the top of the tower. When the MAA content is too large, it will lead to the polymerization of the materi...

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Problems solved by technology

However, in the prior art, the principle of distillation column purification is simply used to eliminate MAA in the gas phase at the top of the tower. Since the esterification gas phase condensate or the extracted water phase contain a certain amount of MAA, after returning to the top of the tower, there will still be A part of MAA is evaporated or entrained, so the effect is not very ideal, and there are many operating control factors of the MMA scrubber, such as the content of MMA, methanol, water and MAA in the esterification gas phase condensate or the extraction water phase, and the reflux rate , the temperature of the reflux control and the temperature and components of the vapor phase of the esterification, due to too many control factors, it is not easy to control, and it is easy to reduce the efficiency of the MMA scrubber to eliminate MAA. Once the efficiency of eliminating MAA decreases, it will lead to The occurrence of polymerization imagination, once the polymerization occurs, the whole device will not be able to operate normally, and can only be stopped for processing. Moreover, the processing of polymerization is difficult and takes a long time, which seriously restricts the long-term operation of the MMA device, which in turn leads to increased material loss and increased operating costs.

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