Method and device for preventing m-phthalonitrile from being caked

Abstract

The invention relates to a method and a device for preventing m-phthalonitrile from being caked. After being gasified, ammonia gas and the m-phthalonitrile enter a fluidized bed to be subjected to an ammoxidation reaction; a resultant enters a thin-wall material collector through an oil cooler and is subjected to cooling and material collection; a product is intermittently washed into a washing tower by water and then is washed, centrifuged and dried; after being dried, the product is conveyed into a stock bin through a packing auger conveyor; after being crushed, the product is added into a granulator by adopting a single-screw-rod charging machine and then is prepared into olive-shaped grains; then the olive-shaped grains are sieved by a vibration sieve device; m-phthalonitrile dried powder blocks are crushed and granulated and then are sieved to obtain finished-product grains; the m-phthalonitrile grains are discharged through a vibration sieve and packaged. According to the method and the device, provided by the invention, the m-phthalonitrile is prepared into the olive-shaped finished-product grains through the granulator and discharged materials of the vibration sieve are automatically packaged; the product is grain-shaped, the density is increased and the product is not caked, so that ton bags are used for packaging; the labor intensity of subsequent work can be alleviated and the labor force is reduced; meanwhile, dust pollution is also alleviated.

Description

technical field [0001] The invention relates to a method and a device for preventing the agglomeration of isophthalonitrile, belonging to the technical field of fine organic compound preparation. Background technique [0002] Isophthalonitrile is an important chemical product. It is an intermediate for the preparation of fine organic compounds. It is an important raw material for the synthesis of pesticide fungicide chlorothalonil. It can also be used for the preparation of plastics, synthetic fibers and epoxy resins. Raw materials for products such as curing agents. [0003] In the original production process, ammonia and m-xylene are vaporized and enter the fluidized bed through the vaporizer for ammoxidation reaction. The product enters the thin-walled receiver through the oil cooler for cooling and receiving, and the product is washed intermittently into the washing tank for washing. After centrifugation, drying and cyclone dust removal, the product of isophthalonitrile...

AI Technical Summary

Problems solved by technology

The structural characteristics of isophthalonitrile crystals are very special. The crystals are in the shape of needles or flakes. During the cooling and crystallization process, the crystals are easy to stick and agglomerate. Therefore, the product is packaged in 25 kg / bag, and the packaging capacity cannot be increased.

Moreover, 25 kg of isophthalonitrile products still stick together into lumps, making separation difficult, which increases labor and labor intensity in the production and feeding of downstream products chlorothalonil

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