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Anti-caking method of high-purity guanidine nitrate for liquid crystal substrates

A technology of liquid crystal substrate and guanidine nitrate, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as guanidine nitrate is not easy to agglomerate, and guanidine nitrate is easy to agglomerate, so as to reduce production and use costs and prolong The effect of storage time

Inactive Publication Date: 2019-06-04
蔡玉真
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problem that guanidine nitrate is easy to agglomerate, provides a kind of preparation method of guanidine nitrate, the guanidine nitrate prepared by this preparation method is not easy to agglomerate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Put industrial nitric acid and industrial guanidine carbonate into the reaction kettle to react. After the reaction is completed, remove impurities, concentrate, crystallize, and centrifuge according to the existing process. The obtained guanidine nitrate wet material with a water content of 2.5% is mixed with the guanidine nitrate wet material Put it in a vacuum drying oven with a temperature of 120°C and a vacuum degree of -0.06Mpa, and dry it for 2 hours, then take out the dried guanidine nitrate, put it in a constant temperature airtight packaging room with a temperature of 40°C, and let it cool to The temperature of guanidine nitrate is the same as the ambient temperature, and the final moisture content of the product is 0.1% after testing, and the product is finally packaged.

Embodiment 2

[0013] The preceding process is the same as in Example 1. Put the centrifuged guanidine nitrate wet material into a vacuum oven with a temperature of 125°C and a vacuum of -0.065Mpa and dry for 1.5 hours. Then the dried guanidine nitrate is taken out and placed in a temperature Be in the constant temperature airtight packing room of 40 ℃, and pass into cold wind, be cooled to the guanidine nitrate temperature and ambient temperature are the same, the final moisture content of the product is 0.09% after testing, and finally pack the product.

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Abstract

The invention discloses an anti-caking method of high-purity guanidine nitrate for liquid crystal substrates. Industrial nitric acid and industrial guanidine carbonate are used as raw materials, and successively undergo processes of reaction, impurity removal, concentration, crystallization, centrifugation, drying and packaging to prepare a guanidine nitrate product. The drying process of the guanidine nitrate is as follows: placing guanidine nitrate into a vacuum drying oven at the temperature of 120-140 DEG C and at the vacuum degree of minus 0.06- minus 0.08 MPa, and drying until the finalwater content of the product is less than or equal to 0.1%; and then taking out the dried guanidine nitrate and placing into a constant-temperature closed environment at the temperature of 40-50 DEG C, introducing cold air, and cooling until temperature of guanidine nitrate is equal to the environment temperature. The prepared guanidine nitrate is not easy to agglomerate, which reduces the production and use cost of clients; and the storage time of the guanidine nitrate is prolonged.

Description

technical field [0001] The invention relates to a method for preparing guanidine nitrate, in particular to a method for preventing caking of high-purity guanidine nitrate for liquid crystal substrates. Background technique [0002] Guanidine nitrate is white crystalline powder or granules, easily soluble in water and alcohol, and has irritating effects on eyes, skin, mucous membranes and upper respiratory tract. Guanidine nitrate is not only a raw material for the insecticide imidacloprid in pesticides, but also used for the synthesis of the intermediate nitroguanidine in the next step. , Chlorsulfuron-methyl, etc. In addition, it is also used in TFT-LCD liquid crystal, PDP plasma color TV. At present, the preparation method of guanidine nitrate causes serious agglomeration after the product comes out, and it needs to be manually crushed before it can be used, which affects the use of customers and increases the production cost of customers; moreover, the product storage t...

Claims

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Application Information

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IPC IPC(8): C07C277/00C07C277/06C07C279/02
Inventor 蔡玉真
Owner 蔡玉真
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