Method for preparing C5 hydrocarbon resin from methyl tetrahydro benzoic anhydride production waste liquor

Abstract

The invention relates to a method for preparing C5 petroleum resin by using the waste liquor in the methyl tetrahydrophthalic anhydride production. The method comprises the following steps: firstly, the waste liquor in the methyl tetrahydrophthalic anhydride production is separated for colloid removal to obtain cis-1,3-pentadiene material A, and the cracked C5 fraction is separated for dicyclopentadiene removal to obtain decyclization C5 material B; secondly, the materials A and B are fed according to the weight ratio of 1:0.1-5, and the intermittent cationic polymerization reaction is performed to the materials A and B in the C5 light oil solvent under the catalysis of catalyst (aluminium trichloride); and thirdly, after the polymerization reaction is finished, the catalyst is removed by a third-order continuous water-washing method to obtain the C5 petroleum resin. The prepared C5 petroleum resin is shallow coating color, high in softening point and stable in quality index and is especially used for road marking, and the method utilizes the waste liquor in the methyl tetrahydrophthalic anhydride production, improves the utilization value of the waste liquor, realizes the automation by adopting the continuous water-washing process and reduces the consumption of the water and the materials when improving the water-washing efficiency.

Description

technical field [0001] The invention belongs to the field of preparation of C5 petroleum resin, and in particular relates to a method for preparing C5 petroleum resin by using methyltetrahydrophthalic anhydride production waste liquid. Background technique [0002] Methyltetrahydrophthalic anhydride is a commonly used epoxy resin curing agent. It is based on the mixed carbon five (hereinafter referred to as piperylene mixed carbon five) enriched in piperylene obtained by separating the by-product carbon five cuts from ethylene cracking. Raw materials, prepared by reaction with maleic anhydride. [0003] There are cis and trans isomers of piperylene. In the reaction of piperylene and maleic anhydride, only trans piperylene participates in the reaction, while cis is mixed with other non-reacting carbon five. The components are separated from the reaction product by distillation during the production process, and become the production waste liquid of methyl tetrahydrophthalic ...

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Problems solved by technology

[0005] The by-product cracking C5 fraction in the ethylene production process is rich in isoprene, cyclopentadiene and piperylene, which can be separated from dicyclopentadiene by thermal polymerization to obtain decyclized C5, and its cyclopentadiene and dicyclopentadiene The content of ethylene is less than 2%, and the color of C5 petroleum resin produced by it is relatively light, and the cost is lower than that of piperylene resin, but due to the high content of isoprene, its double bond activity will cause excessive crosslinking of C5 petroleum resin, making The solubility and compatibility of the resin become worse, the molecular weight is not easy to control, and its chroma and softening point are difficult to fully meet the needs of marking paint

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