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Method for cleanly producing high-purity cyanate at low temperature

A technology of clean production and production method, applied in the direction of cyanic acid/isocyanic acid, etc., can solve the problems of difficulty in carrying out, long reaction time, high energy consumption, and achieve the effect of easy availability of primers, not easy to decompose, and good safety.

Active Publication Date: 2012-02-01
HUBEI DELI NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this reaction process overcomes the disadvantages of high-temperature melting, it is carried out in three steps. If the temperature control is not good in each step, by-products are likely to be produced, and the reaction state is viscous solid, and the reactants in the kettle have great adhesion. , in the actual reaction, the reaction time is long, a large-power stirrer is required, the energy consumption is high, and it is difficult to carry out large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Adopt continuous production method to produce sodium cyanate, process is as follows:

[0043] 1. Put urea and sodium carbonate into the mixer according to the molar ratio of 2.29:1, mix for 10-20 minutes and set aside.

[0044] 2. Turn on the reaction kettle to stir, and run it empty for 10-20 minutes. After there is no abnormality, add 50-80kg of finished sodium cyanate into the kettle, open the hot oil valve, and heat.

[0045] 3. When the temperature of the material in the kettle reaches 140-150°C, open the conveying cage to start feeding, and the feeding amount is controlled at about 50-100kg per hour (calculated by sodium carbonate).

[0046] 4. Stir the reactant below 180°C (13-20 rpm) and react, specifically, react at 160-180°C. When the material level in the kettle reaches 1 / 3 of the volume of the reactor, take a sample for detection (more can be taken in the middle Several times), the purity of sodium cyanate was detected to be about 91% by sampling multiple t...

Embodiment 2

[0050] Adopt continuous production method to produce sodium cyanate, process is as follows:

[0051] 1. Put urea and sodium carbonate into the mixer according to the molar ratio of 1.76:1, mix for 10-20 minutes and set aside.

[0052] 2. Turn on the reaction kettle to stir, and run it empty for 10-20 minutes. After there is no abnormality, add 50-80kg of finished sodium cyanate into the kettle, open the hot oil valve, and heat.

[0053] 3. When the temperature of the material in the kettle reaches 140-150°C, open the conveying cage to start feeding, and the feeding amount is controlled at about 50-100kg per hour (calculated by sodium carbonate).

[0054] 4. Stir the reactant below 180°C (13-20 rev / min) and react, specifically at 160-180°C. When the material level in the kettle reaches 1 / 3 of the volume of the reactor, take a sample for detection (more can be taken in the middle Several times), the purity of sodium cyanate is no longer changed when the purity of sodium cyanate...

Embodiment 3

[0058] Adopt continuous production method to produce sodium cyanate, process is as follows:

[0059] 1. Put urea and sodium carbonate into the mixer according to the molar ratio of 2.12:1, mix for 10-20 minutes and set aside.

[0060] 2. Turn on the reaction kettle to stir, and run it empty for 10-20 minutes. After there is no abnormality, add 50-80kg of finished sodium cyanate into the kettle, open the hot oil valve, and heat.

[0061] 3. When the temperature of the material in the kettle reaches 140-150°C, open the conveying cage to start feeding, and the feeding amount is controlled at about 50-100kg per hour (calculated by sodium carbonate).

[0062] 4. Stir the reactant below 180°C (13-20 rev / min) and react, specifically at 160-180°C. When the material level in the kettle reaches 1 / 3 of the volume of the reactor, take a sample for detection (more can be taken in the middle Several times), the purity of sodium cyanate is no longer changed when the purity of sodium cyanate...

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Abstract

The invention discloses a method for cleanly producing high-purity cyanate at a low temperature, which comprises the following steps of: mixing urea and carbonate for 10-20 min for standby; adding cyanate bottom materials into a reactor, adding a mixture of the urea and the carbonate after the cyanate bottom materials are preheated to 140-150 DEG C; completely reacting the urea and the carbonate at a temperature of 160-180 DEG C; and obtaining a cyanate product after reacted materials are crushed. The invention also can adopt a continuous production manner. In the invention, potassium cyanate (sodium cyanate) is adopted as bottom materials so as to improve the dispersion of the reacted materials, more completely react the reacted materials, improve the product purity and generate no pollution; the reaction is conducted under the closed low-temperature environment so as to generate no toxic byproducts and greatly improve the safety; and the produced gas almost can be completely recovered without three-waste pollution. The high-purity cyanate has remarkable economic benefit and social benefit.

Description

technical field [0001] The invention relates to a low-temperature and clean production method of high-purity cyanate, in particular to a method for preparing cyanate at low temperature by using urea and potassium carbonate / sodium as raw materials, and belongs to the technical field of inorganic synthetic chemistry. Background technique [0002] Potassium cyanate (sodium) is an important inorganic salt, which can be used to prepare hypnotics and anesthetics, as well as herbicides, defoliants, insecticides, metal heat treatment agents and resin modifiers, and is widely used in glass Manufacturing, ceramic art, metal surface hardening, fertilizers and organic synthesis. At present, there is a large demand for cyanate in the international market. There are many ways to synthesize cyanate (sodium, potassium). Earlier, potassium cyanide ( Sodium) is converted into potassium cyanate (sodium), and this method uses potassium cyanide (sodium), which has high toxicity, unsafe operatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/14
Inventor 刘爱兵
Owner HUBEI DELI NEW MATERIALS
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