Process for preparation of methacrylic acid and methacrylic acid esters
一种甲基丙烯酸酯、甲基丙烯酸的技术,应用在甲基丙烯酸的制备领域,能够解决没有教导回收甲基丙烯酸等问题
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[0201] Example 1 describes how Figure 4 part of the method shown. 82.1% by weight of MAA, 14.3% by weight of various and partially unknown high boilers (dimeric and oligomeric MAA, maleic acid, terephthalic acid, citraconic acid, polymer etc.) and 3.6% by weight of inhibitors (mainly hydroquinone) and the first aqueous phase containing 0.6% by weight of MAA and 5.0% by weight of high-boiler compounds isolated from the first extraction unit A3 at a ratio of 1:80 The ratio of the high boiler phase to the first aqueous phase is combined in the merging unit R. The concentrations in the resulting combined phase were measured to be 1.6% by weight of MAA and 5.1% by weight of high boilers. The combined phases are extracted in a second separation unit B with n-hexane. 4.9% by weight of MAA was produced in the organic phase, compared to 3.9% by weight of MAA in the comparative case when the first aqueous phase was not combined with the high boiler phase.
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