A 1,3-cyclohexanedione closed-loop two-stage drying method and drying device

Abstract

The invention provides a closed cycle two-stage drying method and drying device of 1,3-cyclohexanedione. The closed cycle two-stage drying device of the 1,3-cyclohexanedione comprises a dryer, a gas-solid separator, a circulating fan, a heater, a feeding device, and a dehydrating device. Inert gases is adopted as drying carrier gas, the oxygen content of a system is strictly controlled, the dryingdevice has destaticization, the possibility of dust explosion during drying is reduced, and the security of a drying process of the 1,3-cyclohexanedione is enhanced; and a two-stage drying closed cycle technology is adopted, the energy consumption is effectively reduced, drying is more through, the water content of products is no more than 0.3%, the yield of the products is no less than 99.5%, the products are powdery particle from yellowish to white, block mass and impurities are inexistent, and the drying carrier gas closed cycle reduces the emission of harmful gases. The closed cycle two-stage drying method and drying device of the 1,3-cyclohexanedione has the advantages of low in energy consumption, good in production quality and high in process safety, and applies to the drying of flammable and combustible thermosensitive substance.

Description

technical field [0001] The invention belongs to the technical field of post-processing of chemical products, and in particular relates to a 1,3-cyclohexanedione closed-circuit two-stage drying method and a drying device using inert gas as a drying medium. Background technique [0002] 1,3-Cyclohexanedione is widely used as an important chemical and pharmaceutical intermediate, with a melting point of 101-105°C and a flash point of 85.7°C. The product usually exists in the form of slightly yellow or grayish powder. When the water content of 1,3-cyclohexanedione is high, the melting range will drop below 90°C, and the product will easily adhere to the inner wall of equipment and packaging, and is prone to oxidative decomposition. The existing 1,3-cyclohexanedione drying process usually uses hot air as the drying medium. The single-stage drying process requires high temperature control, and the water content of the dried product can easily exceed 0.5%, making the product easy t...

AI Technical Summary

Problems solved by technology

The existing 1,3-cyclohexanedione drying process usually uses hot air as the drying medium. The single-stage drying process requires high temperature control, and the water content of the dried product can easily exceed 0.5%, making the product easy to stay on the inner wall of the drying system. The yield drops; at the same time, the equipment needs to be cleaned regularly and the work intensity of the workers is increased; the energy consumption of single-stage drying is high; there is a possibility of dust explosion in the drying process

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