A kind of environmentally friendly and clean production process of cyanuric acid

Abstract

The invention provides an environment-friendly cleaning production technology of high-purity cyanuric acid. The production technology comprises the steps that urine and a composite catalyst are mixedto react at the temperature of 120-270 DEG C and pressure of -0.01 to -0.2Mpa, and a crude product of cyanuric acid is obtained; the composite catalyst is a mixture prepared from ammonium chloride, ammonium nitrate, sodium nitrate and potassium nitrate; the crude product of cyanuric acid is mixed with a sulfuric acid aqueous solution to react at the temperature of 60-170 DEG C after being smashed,filtration is conducted, and a cyanuric acid solid is obtained; and the cyanuric acid solid is washed, centrifugated, and dried, and the refined product of cyanuric acid is obtained. The preparationsteps are simple, no harmful gas and waste liquid is emitted in the production process, recycling of waste liquid, waste gas and waste heat can be achieved, and the energy utilization rate is improved. The obtained crude product of cyanuric acid has the high content of cyanuric acid, so that the yield and the purity of the target product are high. The post-treatment refining method of the crude product of cyanuric acid is simple, the cost is reduced, and the industrialized production of cyanuric acid is facilitated.

Description

technical field [0001] The invention relates to a process for producing high-purity cyanuric acid with good environment and cleanness, and belongs to the technical field of chemical intermediate preparation. Background technique [0002] Cyanuric acid is white crystal, odorless, slightly bitter taste; it is mainly used in the synthesis of chlorinated derivatives, trichloroisocyanuric acid, sodium or potassium dichloroisocyanurate, and can also be used in the preparation of cyanuric acid-formaldehyde resin, Epoxy resins, antioxidants, coatings, adhesives, pesticides and herbicides, metal cyanide corrosion inhibitors, polymer material modifiers, etc.; it has a wide range of uses and is an important chemical reagent, organic synthesis and drug synthesis raw materials. [0003] At present, the main way to produce cyanuric acid in industry is to heat urea with coal as fuel, and urea is pyrolyzed and condensed to produce cyanuric acid; its disadvantages are: long reaction time, h...

AI Technical Summary

Problems solved by technology

[0003] At present, the main way to produce cyanuric acid in industry is to use coal as fuel to heat urea, and urea is pyrolyzed and condensed to produce cyanuric acid; its disadvantages are: long reaction time, high temperature, and coal as fuel, high energy consumption and It is not conducive to environmental protection; the follow-up refining process is complex, labor-intensive and costly; the waste gaseous ammonia and waste liquid produced by the reaction have serious pollution to the environment, and the production environment of workers is harsh; the obtained crude cyanuric acid itself has a low content, resulting in the yield of the target product and low purity

Though the present invention has shortened reaction time, has reduced reaction temperature to a certain extent, reaction temperature is still higher, and energy consumption is high; The content of cyanuric acid is lower in the obtained cyanuric acid crude product, so the productive rate of cyanuric acid is relatively low Low; the subsequent reaction of crude cyanuric acid and sulfuric acid needs to go through multi-stage reactors, the subsequent refining treatment is complicated, the operation and preparation are cumbersome, the cost is high, the amount of sulfuric acid is large, and the amount of waste liquid is large, which is not conducive to environmental protection; Concerning the purity of cyanuric acid