CN205328904U

CN205328904U - System for synthetic dicyandiamide of one -step method

Info

Publication number: CN205328904U
Application number: CN201521008389.0U
Authority: CN
Inventors: 张金利; 周鸣亮; 杨超; 李韡; 韩优; 付雁
Original assignee: SHANGHAI FLUKO TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: SHANGHAI FLUKO TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2015-12-07
Filing date: 2015-12-07
Publication date: 2016-06-22
Anticipated expiration: 2025-12-07

Abstract

The utility model discloses a system for synthetic dicyandiamide of one -step method, this system be including reaction article 1, reactor 1 through the pipeline in proper order with first filter 2, crystallizer 3, second filter 4 and 5 connections in the desicator, second filter 4 is connected with reactor 1 through the pipeline, be provided with lime nitrogen inlet port on the reactor 1, carbon dioxide gas lets in mouthful and water inlet port, be provided with the impurity discharge port on the first filter 2. Utilize the utility model discloses a system directly synthesizes the dicyandiamide, does not produce single cyandiamide midbody. On the basis of having guaranteed crystal stability and high quality, realized the high -efficient production of dicyandiamide, improved the productivity, saved equipment cost and operating cost.

Description

The system of one-step synthesis method dicyandiamide

Technical field

This utility model relates to the system of a kind of one-step synthesis method dicyandiamide。

Background technology

Dicyandiamide, has another name called cyanamid dimerization, and abridge DICY or DCD, chemical formula C2H4N4。White crystalline powder, is the dimer of cyanamide, is also the cyano derivative of guanidine。Dicyandiamide is typically used as the raw materials for production of tripolycyanamide and medical and dyestuff intermediate, is a kind of very important fine chemical material。In medical industry, it is used for producing Guanidine nitrate (1:1) and sulfa drugs etc.。Can also be used for producing guanidine, thiourea, celluloid stabilizer, steel surface sclerosing agent, thiofide, printing and dyeing color fixing agent, artificial leather filler and binding agent etc.。Existing production dicyandiamide technology is the cyanogen ammonia hydrogen calcium suspension by preparing nitrolim hydrolysis gained, removes calcium hydroxide filtering residue through filtration under diminished pressure, then passes into carbon dioxide to be precipitated out as calcium carbonate by calcium to filtrate, obtains cyanamide liquid。Make it be polymerized in the basic conditions, then through filtration, crystallisation by cooling, separation, dry, obtain dicyandiamide。Its equation is as follows:

2CaCN₂+2H₂O→Ca(HCN₂)₂+Ca(OH)₂

Ca(HCN₂)₂+CO₂+H₂O→2NH₂CN+CaCO₃

2NH₂CN→(NH₂CN)₂

Lime nitrogen hydrolysis decalcification can release amount of heat, and owing to cyanamide is unstable, temperature is too high can be polymerized, it is easy to form dicyandiamide, so, what temperature obtained when controlling bad is cyanamide and dicyandiamide mixture。In existing technique, first pass through control cryogenic conditions and obtain highly purified cyanamide solution, then dicyandiamide is prepared in cyanamide solution high temperature polymerization。So, additional cooling water control temperature causes the significant wastage of energy consumption and water resource, and technological process simultaneously is long, causes that production efficiency is low, cost of equipment is high。

Utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, it is provided that energy consumption is little, and technological process is short, the system of the one-step synthesis method dicyandiamide that production efficiency is high, cost of equipment is low。

The technical solution of the utility model is summarized as follows:

The system of one-step synthesis method dicyandiamide, including reactor 1, reactor 1 by pipeline successively with the first filter 2, crystallizer 3, the second filter 4 and exsiccator 5 connect；Second filter 4 is connected with reactor 1 by pipeline, described reactor 1 is provided with lime nitrogen and adds entrance, and carbon dioxide passes into Kou Heshui and adds entrance, and described first filter 2 is provided with impurity outlet。

Utilize system of the present utility model to be directly synthesized dicyandiamide, do not produce cyanamide intermediate。Ensure that in crystalchecked and the high basis of quality, it is achieved that the efficient production of dicyandiamide, improve production capacity, save cost of equipment and operating cost。

Accompanying drawing explanation

Fig. 1 is the system schematic of one-step synthesis method dicyandiamide。

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, and embodiment of the present utility model is to enable those skilled in the art to be more fully understood that this utility model, but this utility model is not imposed any restrictions。

The system of one-step synthesis method dicyandiamide, including reaction product 1, reactor 1 by pipeline successively with the first filter 2, crystallizer 3, the second filter 4 and exsiccator 5 connect；Second filter 4 is connected with reactor 1 by pipeline, described reactor 1 is provided with lime nitrogen and adds entrance, and carbon dioxide passes into Kou Heshui and adds entrance, and described first filter 2 is provided with impurity outlet。

Embodiment 1

The method (see Fig. 1) of one-step synthesis method dicyandiamide, comprises the steps:

Lime nitrogen by the pulverizing of 15kg nitrogen content 20wt%, 40L water and carbon dioxide pass in reactor, control temperature at 70-80 DEG C, by the amount of control carbon dioxide within the scope of 5-10L/min, reaction is made to carry out polyreaction when pH=10-11, polymer fluid filtered while hot removes impurity filtering residue 9.4kg, refilter after filtrate crystallisation by cooling and obtain dicyandiamide crystal and dicyandiamide crystalline mother solution, dicyandiamide crystal washes with water, dried for dicyandiamide crystal product 7.2kg (dicyandiamide product quality mark is 98%), dicyandiamide crystalline mother solution returns to reactor cycles and uses。

Claims

1. the system of one-step synthesis method dicyandiamide, including reactor (1), it is characterized in that described reactor (1) by pipeline successively with the first filter (2), crystallizer (3), the second filter (4) and exsiccator (5) connect；Described second filter (4) is connected with reactor (1) by pipeline, described reactor (1) is provided with lime nitrogen and adds entrance, carbon dioxide passes into Kou Heshui and adds entrance, and described first filter (2) is provided with impurity outlet。