Separation technique of pentaerythritol

Abstract

The invention relates to a separation technique, particularly a separation technique of pentaerythritol, which comprises the following steps: 1. carrying out continuous circulation synthesis technique with high temperature and high formaldehyde ratio; 2. carrying out pressurized hydrolysis technique under acidic conditions, thereby decomposing pentaerythritol acetals generated in the reaction process; 3. decolorizing the crude product pentaerythritol solution with activated carbon, removing sodium formate and other impurities with ion exchange resin, and recrystallizing to remove poly-pentaerythritol and other byproducts, thereby further enhancing the product purity and obtaining high-purity pentaerythritol of which the content is 99%. By using the invention, the pentaerythritol can be concentrated to the required concentration in the shortest time, thereby maximally reducing the decomposition action of high temperature on the pentaerythritol and greatly reducing labor intensity of operation of the workers; and the technique provided by the invention is continuous and stable.

Description

Technical field: [0001] The invention relates to a separation process, in particular to a separation process of pentaerythritol. Background technique: [0002] The chemical name of pentaerythritol is 2,2-dimethylol-1,3-propanediol, which is a typical tetrahydric alcohol of neopentyl structure. It has the typical chemical properties of polyols and can perform various reactions that polyols can participate in. Such as nitration, oxidation, etherification, esterification, halogenation, etc. [0003] Pentaerythritol is an important raw material for petroleum, chemical industry, and light industry. It can be used to manufacture dry oil, aviation lubricating oil, flame retardant coating, petroleum antifreeze additive, pentaerythritol epoxy resin, chlorinated polyether engineering materials, etc. Pentaerythritol is used as raw material to manufacture Pentaerythritol tetranitrate is a high-explosive explosive; coatings added with pentaerythritol can improve brightness and heat resi...

AI Technical Summary

Problems solved by technology

[0009] The current evaporation process in China is intermittent evaporation, and the product quality fluctuates greatly, which cannot meet the requirements of high-quality pentaerythritol production.

Because pentaerythritol is a heat-sensitive substance, it is easy to decompose at high temperature, which not only reduces the yield of pentaerythritol, but also increases the coloring degree of pentaerythritol and reduces the quality of pentaerythritol