Ammonium thiocyanate

Ammonium thiocyanate is an inorganic substance, chemical formula NH4SCN, colorless crystal. Irritant, easy deliquescence, soluble in water and ethanol, soluble in methanol and acetone, almost insoluble in chloroform and ethyl acetate. Its aqueous solution is blood red when it meets iron salt solution, but it has no reaction when it meets ferrous salt. The dried product was melted without decomposition when heated to 159°C, and the molecule was converted to thiourea when heated to 170°C.

CAS ：1762-95-4

Application of Ammonium Thiocyanate

Inorganic industry for the manufacture of cyanide, thiocyanate, ferrocyanide, thiourea and as an auxiliary material for the production of hydrogen peroxide. The organic industry is used as a catalyst for polymerization. The pharmaceutical industry is used for synthesis and separation processes in the production of antibiotics. The electroplating industry is used for galvanizing. The printing and dyeing industry is used as a diffusion agent for printing and dyeing. Pesticide industry for the manufacture of Ye Qingshuang, etc. The steel industry is used to configure pickling agents. Analytical chemistry used silver, mercury, trace iron determination, pesticide nitrogen content analysis, water quality analysis, configuration of thiocyanate standard solution.

Used as black nickel plating electrolyte in the black agent and analytical chemistry for the determination of iron and silver in the electrolyte plasma.

Sodium thiocyanate

Sodium thiocyanate is a white orthorhombic crystal or powder. The relative density is 1.735g/cm3. Melting point 287 ℃. Easily deliquescent in the air and produce toxic gases in case of acid. Soluble in water, ethanol, acetone and other solvents. The aqueous solution is neutral, and iron salt to generate blood-colored iron thiocyanate, and ferrous salt does not react, and concentrated sulfuric acid to generate yellow sodium bisulfate, and cobalt salt to generate dark blue cobalt thiocyanate, and silver salt or copper salt to generate white silver thiocyanate precipitation or black copper thiocyanate precipitation.

CAS：540-72-7

Application of sodium thiocyanate

Used as chemical analysis reagent, polyacrylonitrile fiber spinning solvent, color film washing agent, some plant defoliant, etc.

In organic synthesis, it is used to convert halogenated hydrocarbons to the corresponding thiocyanates. For example, isopropyl bromide is reacted with sodium thiocyanate in hot ethanol solution to give isopropyl thiocyanate. Similar reagents are also ammonium thiocyanate and potassium thiocyanate.

Sodium thiocyanate is converted to isothiocyanic acid (S = C = NH) when exposed to acid. After it is generated in situ, it can react with amines to form the corresponding thiourea derivatives.

Used as polyacrylonitrile fiber spinning solvent, chemical analysis reagent, color film washing agent, some plant defoliant, and airport road herbicides. Also used in pharmaceutical, printing and dyeing, rubber treatment, black nickel plating and the manufacture of artificial mustard oil.

Potassium thiocyanate

Potassium thiocyanate, commonly known as potassium rose binge and potassium rose brown, is an inorganic substance with a chemical formula of KSCN. It is mainly used for synthetic resins, insecticides, mustard oil, thiourea and drugs, etc. It can also be used as a chemical reagent and is a common indicator of iron ion (Fe3). It is also used to prepare thiocyanate (thiocyanate) solution, detect ferric ions, copper and silver, urine, and tungsten, capacity indicator of legal titanium; can be used as refrigerant, photographic thickening agent.

Application of Potassium Thiocyanate

Used in the manufacture of thiourea, mustard oil, electroplating solution configuration. Used as refrigerant, steel analysis reagent. Also used in the production of dyes, drugs, etc. Used in the electroplating industry as a deplating agent, refrigerant. Also used in the dye industry, photographic industry, pesticides and steel analysis. SCN-can coordinate with Fe3 to form [Fe(SCN)n]3-n, and the solution can be observed to be blood red, which is often used to test Fe3 in solution.

Co2 reacts with potassium thiocyanate in a solution containing an ammonium salt or directly with ammonium thiocyanate to produce a blue coordination compound. When diluted with water, the blue color fades and turns red, so the reaction needs to be carried out in a concentrated solution to obtain obvious results. Add pentanol (or pentanol and ether mixture) extraction, pentanol layer is blue. This method is often used to detect Co2 in solution, and the reaction is very sensitive.

Desulfurization waste liquid salt extraction project

The company is mainly engaged in the environmental protection treatment of coal carbonization desulfurization and decyanation wastewater and the manufacture of thiocyanate; it is the first in the same industry to establish a whole industrial chain system from waste liquid treatment to product research and development, production and sales, with domestic leading and independent intellectual property rights of coke oven gas desulfurization and decyanation waste liquid environmental protection treatment technology.

In January 2008, the company's products through the ISO9001: 2000 international quality system certification, products have entered the international market, exported to the United States, Africa, Australia, Asia and other countries and regions.

Description of waste residue

The waste residue remaining after the extraction of ammonium thiocyanate from the desulfurization waste liquid also contains ammonium sulfate, ammonium thiosulfate and ammonium thiocyanate. To turn this part of the waste residue into a product, it must be deeply extracted. First, the ammonium thiosulfate in the hanging waste residue must be oxidized to lighten it into ammonium sulfate, and then separated.

Brief description of process flow

1. The waste residue extracted from ammonium thiocyanate is dissolved and dissolved to a certain concentration and transferred to the oxidation tank.

2. Add oxidant in the oxidation kettle, oxidize it, adjust the pH value after oxidation, and then transfer it to the filter press by pump.

3. The liquid pressed by the filter press enters the storage tank, and a small amount of solid is sent to the sulfur extraction section.

4. The liquid in the storage tank enters the concentrating kettle for distillation, and is centrifuged once after being steamed to a certain concentration. After centrifugation, the solid enters the ammonium sulfate dissolving kettle, and the mother liquor enters the mother liquor storage tank for concentration.

5. After the solid entering the ammonium sulfate dissolving tank reaches a certain concentration, it is centrifuged, the centrifuged solid is put into the finished packaging bag, and the liquid enters the mother liquor storage tank to wait for concentration. This cycle is carried out.