- Preparation method of rubber anti-reversion agent 1,3-bis(citraconimidomethyl)benzene
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The invention relates to the technical field of preparation of rubber auxiliaries, in particular to a preparation method of a rubber anti-reversion agent 1,3-bis(citraconimidomethyl)benzene. The preparation method comprises the following steps: (1) mixing citraconic anhydride with a benzene-series solvent in a four-necked flask with a condensing water separator, adding an organic acid catalyst, and raising the temperature for reflux; (2) adding m-xylylenediamine dropwise to the system of the step (1) with an addition time of 0.3-1.0 h, keeping reflux for 1-5 h, and separating water which is brought out by the benzene-series solvent continuously; (3) distilling the benzene-series solvent out, reducing the temperature to 60 DEG C, adding an alcohol solvent, and performing even stirring; and(4) performing cooling, performing filtration, drying the filter cake, collecting the filtrate, and performing recycling. The preparation method has a high conversion rate of the reactants, few by-products and high selectivity of the reaction; and the solvents are all recoverable, less wastewater is generated, and pollution to the environment is small.
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Paragraph 0015-0022
(2019/07/29)
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- Novel synthetic method for 1,3-bis((3-methyl-2,5-dioxopyrrol-1-yl)methyl)benzol
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The invention relates to a novel synthetic method for 1,3-bis((3-methyl-2,5-dioxopyrrol-1-yl)methyl)benzol. The novel synthetic method comprises the following steps: citraconic anhydride, m-xylylenediamine and a solvent are mixed in proportion and subjected to thermal reaction for multiple hours, the solvent is removed through reduced pressure distillation after the reaction, a mixed solvent is added for recrystallization, and a product is obtained after cooling, filtering and drying. The novel synthetic method is simple to operate, stable, reliable, high in reaction yield and applicable to industrial production, the requirement for equipment is low, the purity can reach 98%, and the production cost is reduced greatly through recycling of the solvent.
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Paragraph 0015
(2016/12/26)
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