Separation method of MeTHPA production waste liquid
A technology for the separation of methyltetrahydrophthalic anhydride, which is applied in the direction of carboxylic anhydride preparation, extraction and distillation, etc., and can solve problems such as low value
Inactive Publication Date: 2006-04-26
SINOPEC SHANGHAI PETROCHEMICAL CO LTD
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Problems solved by technology
[0004] At present, this MTHPA production waste liquid is usually only used for low-value use, such as fuel and solvent, etc.
Method used
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[0024] The methyl tetrahydrophthalic anhydride production waste liquid whose composition is shown in Table 1 is preheated to 40-50° C. and then enters an extractive distillation tower for extractive distillation. The extractive distillation tower is a packed tower with 45 theoretical plates. The waste liquid enters the extractive distillation column from the 32nd tray at a rate of 400g / h, and the extractant is fed from the 4th tray. The specific extraction agent used in each embodiment, the waste liquid and the feed weight ratio of the extraction agent, the extractive distillation tower are operated under normal pressure, and the tower still and tower top temperature are shown in Table 2. The main composition is shown in Table 3, which is a mixed carbon five mainly composed of cyclopentene and cyclopentane.
[0025] The extractive distillation tower bottom material enters a rectification tower subsequently to carry out rectification, and the rectification tower is a packed tow...
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A method for separating the discharge liquid from the production of methyl four hydrogen benzoic anhydride, the discharge liquid is the hydrocarbon mixture of pentadiene, cyclopentene and cyclopentane, generated in the course of producing the methyl four hydrogen benzoic anhydride by the reaction of hybrid carbon five and anhydride enriched with pentadiene which got from the separation of the carbon five cut fraction which is the by-product of the ethane cracking, the separating process comprises: the discharge liquid being put into the extraction distillation column for extraction and distillation, getting the mixing carbon five material enriched with cyclopentene and cyclopentane in the top of the tower, getting the material enriched with pentadiene and extracting agent in the tower still, the extracting agent is one of the following substances: dimethyl formamide, N-methylpyrrol-idone, acetonitrile, and acetonitrile solution with the water concentration being 5-15 wt%; the said tower still material being put into the distillation tower for distillation, getting the cis-pentadiene on the top of the tower, and extracting agent in the tower still, the extracting agent can be reused. Two fine chemical products with high potential value are got by separating the production discharged liquid, which improves the value of the discharged liquid greatly.
Description
technical field [0001] The present invention relates to a method for separating the waste liquid from the production of methyltetrahydrophthalic anhydride. The waste liquid is produced from the mixed C5 enriched in piperylene obtained by separating the by-product C5 fraction from ethylene cracking as raw material, and combined with cis Anhydride reaction to produce methyl tetrahydrophthalic anhydride production process. Background technique [0002] Methyltetrahydrophthalic anhydride and methylhexahydrophthalic anhydride are the most commonly used curing agents for epoxy resins. Methyltetrahydrophthalic anhydride is generally prepared by reacting piperylene-enriched mixed carbon five (hereinafter referred to as piperylene mixed carbon five) obtained by separating the by-product carbon five fraction from ethylene cracking, and reacting with maleic anhydride. Methyl tetrahydrophthalic anhydride can be produced by further hydrogenation of methyl hexahydrophthalic anhydride. ...
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IPC IPC(8): B01D3/40C07C51/54
Inventor 傅建松王雅辉蒋方红吴忠平张冬梅
Owner SINOPEC SHANGHAI PETROCHEMICAL CO LTD