Continuous synthesis system and method of dicyandiamide

A technology for chemical synthesis and dicyandiamide, applied in the field of continuous dicyandiamide synthesis system, can solve problems such as low product production efficiency, and achieve the effects of reducing product yield, reducing heat exchange load and facilitating temperature control

Inactive Publication Date: 2022-03-01
TIANJIN ASYMCHEM MEDICAL SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a continuous synthesis system and method of dicyandiamide to solve the problem of low product production efficiency in the prior art when large batches of dicyandiamide are intermittently produced

Method used

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  • Continuous synthesis system and method of dicyandiamide

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preparation example Construction

[0057] The present invention also provides a continuous synthesis method of dicyandiamide, and the continuous synthesis method is prepared by the continuous synthesis system of the aforementioned dicyandiamide, and the continuous synthetic method comprises: continuously conveying water and lime nitrogen. The raw material pre-processor 11 is premixed to obtain a premixed material; the premixing material and carbon dioxide are continuously delivered to the hydrolysis of the decallization reactor 21 for hydrolysis, obtaining the hydrolysis of decalcium reactive reactive materials; The material is continuously delivered to the polymerization reactor 22 for polymerization to obtain dicyandiamide.

[0058] The continuous synthesis method of the above-described above-described dicyandiamide is presence:

[0059] 2CACN 2 + 2h 2 O = ca (HCN 2 ) 2 + CA (OH) 2

[0060] CA (HCN 2 ) 2 + 2h 2 O = 2h 2 CN 2 + CA (OH) 2

[0061] 2CA (HCN 2 ) 2 + H 2 O + CO 2 = 2h 2 CN 2 + Caco 3

[0062] CO 2 ...

Embodiment 1

[0073] use figure 1 The system is synthesized. Among them, the hydrolysis of the decalcium reactor is a fin reactor, the fin reactor includes 12 sets of fins, and the height of each set of fins is 15 mm, the thickness is 5 mm, and the spacing of each set of fins is controlled at 25 mm.

[0074] The raw material lime nitrogen with water was continuously input according to 1: 25 (mol).

[0075] The internal temperature of the hydrolysis decalcium reaction column is controlled at 30 to 40 ° C, and the reactive material residence time is about 70 to 80 min, and the material is hydrolyzed and the material enters the third filtration device, and the filter cake is collected by water, the filtrate and the liquid are removed. The merger, by transferring the pump into the polymerization reactor, the reaction temperature is 60 to 70 ° C, the reaction residence time is about 100 to 110 minutes, and the online pH control system is used to ensure the polymerization stage system pH is from 7 to...

Embodiment 2

[0079] And the difference between Example 1 is only:

[0080] The raw material lime nitrogen with water was continuously input according to 1: 25 (mol), and the residence time was about 10 min, and the solid-liquid mixing system of the pre-treated raw material was entered into the hydrolyzate reactor by the transfer pump.

[0081] From the continuous synthesis device, the reaction effect is sampling. The content of the cyanide in the system in the system is about 11.5%, and the purity of the product is 98.2%, and the average reaction yield is 77.4% after drying.

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Abstract

The invention provides a continuous synthesis system and method of dicyandiamide. According to the material flowing sequence, the continuous synthesis system comprises a raw material pretreatment unit and a synthesis unit which are sequentially communicated through a conveying pipeline, and the raw material pretreatment unit comprises a raw material pretreatment device. Based on the system, the continuous production of dicyandiamide by taking lime nitrogen as a raw material is effectively realized, the filtering frequency is reduced, and the product loss is reduced. Meanwhile, based on the arrangement of the system, the reaction conditions can be more accurately and efficiently controlled, so that the reaction yield and the production efficiency of dicyandiamide are further improved.

Description

Technical field [0001] The present invention relates to the field of organic synthesis, and in particular, a continuous synthesis system and method of dicyandiamide. Background technique [0002] Disania is called diodanoamine, known for tanignanignh, is a hydrolyzate, decalculation, and polymerized product, molecular formula C. 2 Hide 4 N 4 . Dienicia is a white crystal, a melting point of 207 to 209 ° C, and the dry matter is stable, soluble in water and ethanol. Dioxaniamide can be used to synthesize sulfonamides, pesticides, dye fixations, carbon ammonium gay agents, wood flammatings, steel surface hardeners, rubber vulcanization accelerators, glass fiber lubricants, and melamine. [0003] The traditional process of preparing sodanamide using lime nitrogen is divided into three-step and two-step method. The three steps are: hydrolysis, decalcium and aggregation. The two steps are: hydrolysis decalcium and aggregation is carried out. Among them, three-step hydrolysis and decal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C277/08C07C279/28
CPCC07C277/08C07C279/28
Inventor 洪浩洪亮陶建郭金海张磊万东海王森林李佳乐
Owner TIANJIN ASYMCHEM MEDICAL SCI & TECH DEV CO LTD
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