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System for direct-heat-exchange production of cyanamide by utilization of low-boiling-point organic solvent and method thereof

An organic solvent, low boiling point technology, applied in the direction of cyanamide, etc., can solve the problems of fouling of heat exchange equipment, reduced heat exchange effect, large temperature gradient in the reactor, etc., to eliminate temperature gradient, reduce production, and save energy. and water resources

Active Publication Date: 2016-04-27
SHANGHAI FLUKO TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing process, the partition wall heat exchanger is used for cooling, resulting in a large temperature gradient in the reactor, which cannot avoid the formation of dicyandiamide due to the hot spot temperature of the reactor exceeding 60°C, and will cause fouling of the heat exchange equipment, resulting in Reduced thermal effect

Method used

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  • System for direct-heat-exchange production of cyanamide by utilization of low-boiling-point organic solvent and method thereof

Examples

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Effect test

Embodiment 1

[0020] A method for producing cyanamide intermittently by direct heat exchange with a low-boiling organic solvent comprises the steps:

[0021] Pass 1.5kg of pulverized lime nitrogen with a nitrogen content of 20wt%, 3L of water, 2L of n-pentane and carbon dioxide gas into the reactor 1 and disperse evenly, control the temperature in the reactor below 60°C, and control the flow rate of carbon dioxide gas It is 6L / min, utilizing the vaporization of low-boiling point organic solvent n-pentane to directly absorb the heat released by the reaction of cyanamide. After the device 6 condenses, return to the organic solvent storage tank 5 for recycling, and the reaction product is filtered to remove the filter residue 2.1kg in the filter 2, and after the filtrate is phase-separated in the phase separator 3, the obtained mass fraction is 24.5% cyanamide aqueous solution and normal Pentane and cyanamide aqueous solution pass into cyanamide solution storage tank 4, and n-pentane passes in...

Embodiment 2

[0025] A method for continuously producing cyanamide by direct heat exchange with a low-boiling organic solvent comprises the steps:

[0026] Lime nitrogen, 30L / h water, 20L / h n-pentane and carbon dioxide gas are continuously input into reactor 1 at 15kg / h, and the temperature in the reactor is controlled below 60°C. Vaporization of the organic solvent n-pentane directly absorbs the heat released by the reaction of cyanamide, and controls the amount of carbon dioxide gas in the range of 5-10L / min, so that the reaction system is at pH=9-10; the steam formed by the heat absorption of n-pentane passes through After condenser 6 is condensed, return to organic solvent storage tank 5 for recycling. The reaction product discharged from the reactor is filtered through filter 2 to remove calcium carbonate waste residue. After the filtrate is phase-separated in phase separator 3, the obtained mass fraction is 21.17%. The cyanamide aqueous solution and normal pentane, the cyanamide aqueo...

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Abstract

The invention discloses a system for direct-heat-exchange production of cyanamide by the utilization of a low-boiling-point organic solvent and a method thereof. According to the method, crushed lime nitrogen, a low-boiling-point organic solvent and carbon dioxide gas are introduced into a reactor and uniformly dispersed; temperature in the reactor is controlled to below 60 DEG C, and the low-boiling-point organic solvent is vaporized to directly absorb heat released from a reaction for cyanamide production; when pH of the reaction liquid is 9-10, the reaction is finished; organic solvent steam formed after heat absorption of the organic solvent is condensed by a condenser and the condensed product returns to an organic solvent storage tank to be recycled; reaction products are filtered to remove filter residue; and after filtrate phase-splitting treatment, a cyanamide aqueous solution and a low-boiling-point organic solvent are obtained. by boiling of the low-boiling-point organic solvent, heat released from the reaction is directly absorbed, temperature gradient in the reactor is eliminated, reaction temperature is controlled to below 60 DEG C, and generation of dicyandiamide is reduced. Without cooling water, equipment scaling problem caused by indirect cooling is avoided, energy consumption is lowered, and water resources are saved.

Description

technical field [0001] The invention relates to a system and method for producing cyanamide by direct heat exchange with a low-boiling point organic solvent. Background technique [0002] As an industrial raw material, cyanamide is widely used in pesticide and pharmaceutical raw material industries, and is used as epoxy resin curing agent, dye fixing agent, flocculant, etc. Crystalline cyanamide is mainly used in the synthesis of medicines, health care products, feed additives and pesticide intermediates. The aqueous solution of cyanamide can be used as a defoliant and non-toxic insecticide for fruit trees. Cyanamide is also an intermediate product in the process of synthesizing dicyandiamide. Dicyandiamide, also known as dicyandiamide, abbreviated as DICY or DCD, has a chemical formula of C2H4N4. White crystalline powder, a dimer of cyanamide and a cyano derivative of guanidine, the solubility in water is 4.13g / 100g (298.15K). Dicyandiamide is usually used as a raw mater...

Claims

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Application Information

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IPC IPC(8): C01C3/16
CPCC01C3/16
Inventor 张金利周鸣亮杨超李韡韩优付雁
Owner SHANGHAI FLUKO TECH DEV
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