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A production process and cyanamide technology, applied in the field of cyanamide production technology, can solve problems such as production cost of explosive products
Inactive Publication Date: 2018-03-20
NINGXIA JIAFENG CHEMICALS CO LTD
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[0004] The purpose of the present invention is to provide a cyanamide production process to solve the problems of easy explosion and high production cost of the cyanamide production process in the prior art
Method used
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Embodiment 1
[0027] refer to figure 1 , which shows a kind of cyanamide production process provided by the embodiment of the present invention, comprising the following steps:
[0028] S1, add organic polar solvent or water in the reactor;
[0029] It should be noted that the organic polar solvent may optionally be methanol, ethanol, etc., and the water is supplied by a washing water metering device.
[0030] S2, gradually adding liquid carbon dioxide and lime nitrogen to the reaction kettle, and simultaneously adding a polymerization inhibitor;
[0031] Specifically, the mass of the polymerization inhibitor accounts for 0.01%-0.5% of the water mass, and the liquid carbon dioxide is provided by a carbon dioxide liquid supply station. The lime nitrogen is transported to the lime nitrogen storage silo by the pneumatic conveying system, and the lime nitrogen dust generated by the pneumatic conveying system is collected by the air box pulse bag filter on the top of the lime nitrogen storage ...
Embodiment 2
[0047] Embodiment two, the difference with embodiment one is only:
[0048] Further, step S5 includes: when the preset concentration of the cyanamide solution is 50%, the number of times to repeat step S2 is 4 times, and when step S2 is executed for the first 3 times, the reaction temperature in the reactor should be controlled to 15°C, when performing the fourth step S2, the reaction temperature in the reactor should be controlled to 10°C
[0049] If the preset concentration of the cyanamide solution is 30%, the number of times to repeat step S2 is 2 times, and when step S2 is performed, the reaction temperature in the reactor should be controlled at 15°C.
[0050] Further, air is delivered to the reactor in step S2. The reaction kettle is equipped with a forced circulation pipeline, which not only improves the working environment, but also improves the utilization of liquid carbon dioxide. While treating the waste gas, it provides fresh air to participate in the reaction an...
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Abstract
The invention discloses a production process of cyanamide. The production process comprises the following steps of S1, adding an organic polar solvent or water into a reaction kettle; S2, adding liquid carbon dioxide and lime nitrogen into the reaction kettle step by step, and meanwhile, adding a polymerization inhibitor; S3, carrying out agitation for reaction to obtain a cyanamide slurry mixed solution whose PH (Potential of Hydrogen) value is controlled to be 7.5; S4, filtering the cyanamide slurry mixed solution, so as to obtain cyanamide filer liquor and filter residue, and washing the filter residue to obtain mother liquor and black residue; S5, sending back the mother liquor and the cyanamide filer liquor into the reaction kettle, and repeatedly executing the step S2 until a cyanamide solution with a preset concentration is obtained; S6; regulating the PH value of a substance obtained in the step S5 to a first preset PH value, and carrying out refined filtration on the cyanamidesolution regulated in PH; S7, regulating the PH of the cyanamide solution obtained by the refined filtration to a second preset PH value; S8, settling to obtain the finished-product cyanamide. According to the embodiment of the application, an evaporation concentration process in the prior art is replaced with multiple circular reactions; the temperature is easily controlled and the phenomenon ofan explosion due to a too high reaction temperature cannot occur.
Description
technical field [0001] The invention relates to the field of chemical product production, in particular to a cyanamide production process. Background technique [0002] The chemical name of cyanamide is cyanamide, colorless, deliquescence, orthorhombic crystallization, melting point 450°C, high solubility in polar organic solvents such as lower alcohols, esters and ketones, and low solubility in non-polar solvents , high solubility in water. Cyanamide contains a cyano group and an amino group, both of which are active groups and are prone to reactions such as addition, substitution, and condensation. As a chemical raw material, cyanamide is widely used in the manufacture of fine chemical products, pharmaceutical raw materials and pesticide raw materials. Currently, there are no international or domestic standards for the specifications of cyanamide, and all manufacturers determine their product standards according to customer requirements. At present, there are mainly fou...
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Application Information
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