Solvent rectification device for cloquintocet-mexyl production process and use method of solvent rectification device

Abstract

The invention discloses a solvent rectification device for a cloquintocet-mexyl production process. The device comprises a stock solution tank, a dehydration tower and a rectification tower; the lower part of the stock solution tank is connected with the upper part of a dehydration kettle through a pipeline; a liquid feeding pump is arranged on the pipeline; a first thermal coupling heat exchanger is arranged at a material inlet at the upper part of the dehydration tower; an outlet pipeline of the liquid feeding pump is communicated with the top of the dehydration kettle through the first thermal coupling heat exchanger; a waste gas extraction opening is formed in the top of the dehydration tower and is communicated with a first condenser through the first thermal coupling heat exchanger; a bottom extraction opening of the dehydration kettle is communicated with an inlet in the top of a rectifying kettle; a gas phase extraction opening in the top of the rectification tower is communicated with a heat exchange channel of a second thermal coupling heat exchanger arranged at the top of the dehydration kettle; and the other heat exchange channel of the second thermal coupling heat exchanger is circularly communicated with the bottom of the dehydration kettle; the top of the rectification tower is connected with a DMAc finished product extraction channel. The rectification device is high in efficiency, energy consumption is reduced in a double-effect mode, and production cost is saved; and the device is suitable for medium-and-small-scale solvent recovery rectification.

Description

technical field [0001] The invention relates to the technical field of chemical production equipment, in particular to a solvent rectification device in the production process of detoxaquine and its use method. Background technique [0002] Jieduquine, also known as 1-methylhexyl (5-chloro-8-quinolineoxy) acetate, is light yellow and off-white powder, which can improve the acceptance of plants to the herbicide clodinafop-propargyl and accelerate Detoxification of esters in cereals, always in combination with a herbicide. Jieduquine is a heterocyclic organic compound and can be used as a pesticide intermediate. In the production process of Jieduquine, one of the synthetic routes is through the esterification reaction of chloroacetic acid and 2-heptanol, and the obtained product is then mixed with 5-chloro-8-hydroxyquinoline in the solvent dimethylacetamide (DMAC) The etherification reaction takes place to obtain quinine, and the recovered dimethylacetamide solvent is rectif...

AI Technical Summary

Problems solved by technology

Since the rectification tower is arranged in a vertical structure, it is usually more than ten meters high, its volume is large, it is inconvenient to maintain, and the rectification tower has the characteristics of low efficiency and long time. For small and medium-sized production lines, if you want to For medium and low volume distillation or solvent recovery distillation, large distillation towers are not suitable

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