Carbendazim Cleaner Production System

Abstract

The invention discloses a carbendazim clean production system, belonging to the technical field of pesticide chemical industry. The carbendazim clean production system comprises a lime nitrogen hydrolysis unit, an amination unit, a condensation unit, a water washing centrifugal unit and a drying unit which are sequentially connected. The lime nitrogen hydrolysis unit receives lime nitrogen and sodium carbonate, independently hydrolyzes the lime nitrogen to generate cyanamide, and pumps the cyanamide to the amination unit, the amination unit completes the amination reaction, the condensation unit completes the condensation reaction, the water washing centrifugal unit performs multistage water washing, and the drying unit performs drying. By setting up the lime nitrogen hydrolysis unit, thelime nitrogen and the sodium carbonate solution are mixed and hydrolyzed in a hydrolysis kettle, calcium ions and carbonate ions in a mixed solution generate calcium carbonate suspension, most calciumions are removed in advance through filter pressing of a decalcification filter press, equipment pipeline blockage caused by scaling of a large amount of the calcium ions in a reaction system is avoided, production and operation periods are greatly prolonged, equipment process flow is simple, operation cost is low, and great environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of pesticide chemical industry, and in particular relates to a carbendazim clean production system. Background technique [0002] Carbendazim is an efficient, broad-spectrum, and safe systemic fungicide, which can prevent and control peanut leaf spot, black spot, stem rot, head blight of three wheats, black spot of cereals, sclerotinia of rapeseed, Rice sheath blight, citrus canker, storage disease, melon wilt, flower root rot, stem rot, etc. In addition, carbendazim also has broad application prospects in textiles, printing and dyeing, papermaking, tanning, and wood preservation. [0003] The main preparation process of domestic carbendazim is the lime nitrogen method. Calcium cyanamide is produced by hydrolysis of lime nitrogen, the residue is removed by filtration, and then the hydrogen calcium cyanamide solution is esterified with methyl chloroformate to form a calcium salt solution of methyl cyanamide...

AI Technical Summary

Problems solved by technology

The process mainly has the following problems. The first is that the condensation reaction process affects the quality and yield of carbendazim due to the presence of calcium ions; the second is that the presence of calcium ions causes easy blockage of equipment pipelines and short production cycles; the third is that the waste water produced contains a large amount of chlorine. Calcium chloride and ammonium chloride are difficult to handle and difficult to utilize as resources

[0004] In the prior art, the methods for removing calcium ions include carbon dioxide decalcification, ion exchange resin decalcification and electrodialysis decalcification, but these methods all have the problems of long process flow, cumbersome operation and high cost of decalcification

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