Continuous crystallization device and method for trichlorfon technical

Abstract

The invention discloses a continuous crystallization device of trichlorphon raw medicine, and a method thereof. The device comprises a steel belt, a transmission roller and a cooling device, wherein a material distributer is arranged above the material conveying end of the steel belt, and communicates with a feeding pipe; the outer periphery of the feeding pipe is provided with a heat tracing device; a cooling device is arranged under the middle part of the steel belt; the discharging end of the steel belt is provided with a discharging device; the discharging end of the steel belt is connected with a crushing machine. The method of the trichlorphon raw medicine continuous crystallization by using the device comprises the following steps that (1) the trichlorphon raw medicine is fed into the feeding pipe, is heated by the heat tracing device, then flows into the material distributor, and uniformly and downwards drips and falls through the material distributor; (2) the trichlorphon raw medicine liquid is uniformly spread on the steel belt, and then, the steel belt transmission is stopped; (3) the steel belt is cooled through the cooling device arranged under the steel belt; (4) after the trichlorphon raw medicine is crystallized into trichlorphon crystals, the transmission roller is started; the discharging device discharges the trichlorphon crystals into the crushing machine. The method has the advantages that simplicity is realized; the operation is easy; the crystallization period is short; the quality of the trichlorphon raw medicine crystals is good.

Description

technical field [0001] The invention relates to the field of crystallization devices, in particular to a continuous crystallization device for trichlorfon technical and a method thereof. Background technique [0002] Trichlorfon scientific name: O, O-dimethyl-(2,2,2-trichloro-1-hydroxyethyl) phosphonate, trichlorfon is a type of organophosphorus pesticide phosphate, trichlorfon The original drug is produced in a liquid state. In order to facilitate storage and transportation, it is necessary to crystallize the liquid trichlorfon original drug into a solid. In the prior art, the crystallization method of the trichlorfon original drug: The medicine is poured into high-temperature-resistant plastic bags, and each plastic bag is filled with 10-20kg of trichlorfon liquid raw medicine, the mouth of the bag is tied tightly, and it is transported to a dry, ventilated, flat and spacious warehouse for natural cooling and crystallization. Then it is crushed and crushed into finished p...

AI Technical Summary

Problems solved by technology

Disadvantages of this method: the crystallization time is long, generally 3 to 5 days; it is not easy to get through; in the crystallization process, it is easy to partially decompose; in the later stage of crushing and crushing, it is easy to absorb moisture and affect the quality of the finished product

However, after the cooling of the external circulation pipe, the condensation speed of the material is accelerated when entering the distributor above the rotary steel belt condensing granulator, and the condensation is completed in 23 to 30 seconds, that is, the material is liquid when entering the distributor and drips on the steel belt. The belting time must be controlled within 23 to 30 seconds, otherwise the condensed material will block the distributor. This method requires very high temperature control and dripping time control, and the possibility of distributor blockage is high. Once the material is distributed If the device is blocked, the entire process stops immediately, resulting in production loss

[0004] Chinese utility model patent (authorized announcement number CN 201722301 U, authorized announcement date 2011.01.26) discloses a rotary steel strip condensation granulator for manufacturing granular nitronitrogen, phosphorus, and potassium compound fertilizers. Granulator, granulator distributor, granulator rotary steel belt, and automatic packaging machine, in which the melting kettle, conveying pump, and rotary steel belt condensation granulator are connected in sequence through the insulation pipeline; advantages: the process flow is short, Low investment, low energy consumption, high granulation rate, no return material, uniform product particles, good fluidity, no agglomeration, no need for screening and crushing, etc., but the spray device under the rotary steel belt of the granulator of this device will A large amount of condensed water drips down, and if it is not handled properly, it will damage the device, but the device does not involve a device for treating condensed water, and in the process of use, due to long-term accumulation of materials on the steel belt, It will cause the steel belt to sag, and the deviation of the steel belt will become more and more serious after a long time

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