Closed cycle two-stage drying method and drying device of 1,3-cyclohexanedione

A technology of cyclohexanedione and closed-circuit circulation, which is applied in the direction of drying gas arrangement, drying machine combination, drying solid materials, etc., can solve the problems of increasing the work intensity of workers, regular cleaning of equipment, and high temperature control requirements, so as to improve production Operating environment, reducing the possibility of dust explosion, and reducing the effect of potential safety hazards

Active Publication Date: 2018-05-01
台州新农科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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 wa

Method used

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  • Closed cycle two-stage drying method and drying device of 1,3-cyclohexanedione

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Embodiment 1

[0031] The present invention uses nitrogen as the drying carrier gas, and the water content of the 1,3-cyclohexanedione wet material is 12.3%. The baffle plate of the hole; the gas-solid separation adopts the back-blowing bag filter, the carrier gas heating and condensation water removal adopt the partition wall heat exchanger, the inert gas heater uses 0.5MPa steam as the heating source, and the cold source is cold brine temperature ≤ -10°C; the air temperature of the secondary drying is 73°C, the air temperature of the primary drying is 57°C, the water content of the product is 0.27%, and the product yield is 99.7%; the power consumption per ton of product is 149kWh, the consumption of steam is 0.49 tons, and the cooling capacity Consumes 9.06×10 5 kJ; The product is light yellow to white powdery particles without lumps and impurities.

Embodiment 2

[0033] In the present invention, argon is used as the drying carrier gas, and the water content of the 1,3-cyclohexanedione wet material is 11.3%. The first-stage dryer in the two-stage dryer adopts a flash dryer, and the second-stage dryer adopts a cyclone dryer. ;The gas-solid separation adopts the cyclone separator, the inert gas heater uses 0.5MPa steam as the heating source, and the carrier gas heating and condensation dewatering adopt the partition wall heat exchanger; the dehumidification adopts the membrane separation dehumidification device; the secondary drying air inlet temperature is at 70°C, primary drying air inlet temperature 59°C, water content 0.30%, product yield 99.5%; per ton of product consumes 160kWh of electricity, consumes 0.57 tons of steam, and consumes 9.46×10 cooling capacity 5 kJ; The product is light yellow to white powdery particles without lumps and impurities.

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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...

Claims

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Application Information

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IPC IPC(8): F26B20/00F26B21/08F26B21/10F26B21/14F26B25/00
CPCF26B20/00F26B21/001F26B21/08F26B21/10F26B21/14F26B25/003
Inventor 李琰君杨阿三程榕郑燕萍孙勤屠美玲贾继宁
Owner 台州新农科技有限公司
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