Purification method of cyanamide solution

A cyanamide and solution technology, applied in the direction of cyanamide, etc., can solve the problems of affecting cyanamide content, cyanamide change, high ion content, etc., and achieve the effect of improving quality and reducing content

Inactive Publication Date: 2020-03-27
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the existing production process, in the produced cyanamide products, the content of ammonium, thiocyanate, iron, silicon, calcium, magnesium and other ions is relatively high, which will interact with each other during the long-term storage of the cyanamide solution. Combined with each other, the insoluble matter will eventually be precipitated, and the pH of cyanamide will change, which will affe

Method used

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  • Purification method of cyanamide solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of purification method of cyanamide solution, comprises the following steps:

[0026] a), with the cyanamide solution to be treated, add the flocculant aluminum sulfate of 0.02% of the cyanamide solution quality and mix for 30min, pour into the quartz sand filter and carry out impurity removal;

[0027] b), the cyanamide solution passing through the quartz sand filter enters the precision filter with a precision of 5 μm;

[0028] c), through the cyanamide solution filtered by precision filter, according to a certain flow rate, the exchange load of the D001 cationic resin device is controlled to be 8BV / h, slowly passes through the cationic resin device, and then enters the D201 anion resin device, and the exchange load is controlled to be 8BV / h, for deionization operation.

[0029] d) The cyanamide solution processed by the anion-cation resin device enters the cyanamide storage tank for storage.

[0030] Table 1 Changes of cyanamide solution cyanamide content (%...

Embodiment 2

[0039] A kind of purification method of cyanamide solution, comprises the following steps:

[0040] a), with the cyanamide solution to be treated, add flocculant polyaluminum sulfate of 0.03% of the cyanamide solution quality and mix for 30min, pour into the quartz sand filter for impurity removal;

[0041] b), the cyanamide solution passing through the quartz sand filter enters into a precision filter with a precision of 3 μm;

[0042] c), through the cyanamide solution filtered by the precision filter, according to a certain flow rate, the exchange load of the cation resin device is controlled to be 10BV / h, slowly passes through the 001x7 cation resin device, and then enters the L300 anion resin device, and the exchange load is controlled to be 10BV / h for deionization operation.

[0043] d) The cyanamide solution processed by the anion-cation resin device enters the cyanamide storage tank for storage.

[0044] Table 3 Changes of cyanamide solution cyanamide content (%) and...

Embodiment 3

[0053] A kind of purification method of cyanamide solution, comprises the following steps:

[0054] a), with the cyanamide solution to be treated, add flocculant ferric sulfate of 0.03% of the cyanamide solution quality and mix for 30min, pour into the quartz sand filter for impurity removal;

[0055] b), the cyanamide solution passing through the quartz sand filter enters the precision filter with a precision of 0.2 μm;

[0056] c), through the cyanamide solution filtered by the precision filter, according to a certain flow rate, the exchange load of the cationic resin unit is controlled to be 20BV / h, slowly passes through the D001 cationic resin unit, and then enters the NDA900 anion resin unit, and the exchange load is controlled to be 20BV / h for deionization operation.

[0057] d) The cyanamide solution processed by the anion-cation resin device enters the cyanamide storage tank for storage.

[0058] Changes of cyanamide solution cyanamide content (%) and ion content / ppm...

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Abstract

The invention belongs to the field of chemical engineering, the invention particularly relates to a purification method of a cyanamide solution. According to the method, anion-cation exchange resin isadopted to treat cyanamide, the content of ammonium radicals, thiocyanate, iron, silicon, calcium, magnesium and other ions in the cyanamide solution is reduced, the cyanamide solution can stably exist at the natural environment temperature, insoluble substances are not separated out, the content is not reduced after the cyanamide solution is placed for a long time, and then the quality of the cyanamide is improved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for purifying a cyanamide solution. Background technique [0002] Cyanamide is a kind of pharmaceutical raw material and intermediate, mainly used in the production of cytarabine hydrochloride, 3-amino-5-hydroxyl 1, 2, 4-triazole, etc. It is also a raw material for organic synthesis, such as the production of cyanuramide , dicyandiamide, methyl carbamate, etc., and then produce pharmaceutical barbituric acid, sulfa drugs, various guanidine salts, pesticide Zhiyaling, carbendazim, creatine, etc. Cyanamide can be used as a plant growth regulator in agriculture, with both insecticidal and bactericidal effects. Especially in the production of cherries and grapes, it is a good dormancy terminator, which can lead to early flowering and fruiting, increase yield, and change fruit flesh quality. [0003] The physical and chemical properties of the product are: crysta...

Claims

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Application Information

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IPC IPC(8): C01C3/16
CPCC01C3/16
Inventor 张超梁万根刘冠宏崔卫华张宁曹斌靖培培
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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