WO2016199944A1 - Process for production of sodium cyanide - Google Patents
Process for production of sodium cyanide Download PDFInfo
- Publication number
- WO2016199944A1 WO2016199944A1 PCT/KP2015/000039 KP2015000039W WO2016199944A1 WO 2016199944 A1 WO2016199944 A1 WO 2016199944A1 KP 2015000039 W KP2015000039 W KP 2015000039W WO 2016199944 A1 WO2016199944 A1 WO 2016199944A1
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- WO
- WIPO (PCT)
- Prior art keywords
- raw materials
- order reaction
- mesh
- tank
- mixture
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C3/00—Cyanogen; Compounds thereof
- C01C3/08—Simple or complex cyanides of metals
- C01C3/10—Simple alkali metal cyanides
Definitions
- the present invention relates to a process for producing high purity(above 98%) of sodium cyanide with urea and sodium carbonate.
- the purity of sodium cyanide produced by the above methods is 80% ⁇ 98%.
- the defect of the above production methods is that there exist the environmental pollution by toxic gas, that is, HCN, high production cost and explosion danger and difficulty in obtaining higher purity than 98 %.
- the object of the present invention is to provide a process for producing high purity (above 98 ) of sodium cyanide using urea and sodium carbonate as main raw materials.
- the present invention discloses a process for production of high purity (above 98%) of sodium cyanide using Urea and sodium carbonate.
- Figure 1 shows the process diagram for production of sodium cyanide according to the present invention. Detailed description of the Invention
- the invention discloses a process for the production of sodium cyanide with urea and sodium carbonate as main raw materials comprising following steps. a) Step for mixing of raw materials
- the product in melting state is dispersed and atomized by centrifugal force by a rotating-cylinder of which diameter is 600-800 mm and rotation speed is 400-600 rpm, and by rapid -cooling
- the atomized reaction-product is charged a dissolution tank with and a mixed solvent corresponding to 4 times the reaction product volume is added and then a mixture is obtained by agitating the atomized reaction product and the mixed solvent at 300 rpm for 20-30 min.
- the mixed solvent consists of 5-20 %, preferably 8-15% of benzene aromatic compound, 30-45% preferably 35-42% of methanol (or ethanol) and water.
- methanol or ethanol
- Sodium carbonate sediment is separated from the mixture(solution and sediment) which has passed through the step for agitation and dissolution by 200 mesh-sieve passage, while the pressure of system inside is 13.3 ⁇ .40 KPa.
- the separated sediment namely, un-reacted sodium carbonate is recycled into the step for blending of raw material through the step for vacuum-drying.
- Step for vacuum distillation consists of filtering by a buffered filtration tank and distillation by a distiller, and the buffered filtration tank has 200 mesh sieve, so that sodium cyanide solution which has passed through the step for precipitation and filtration can be transferred into the distiller.
- the distiller consists of a double-wall tank of which the inside has many coil pipes at some spaces with outside blades for heat exchange so as to increase evaporation speed.
- Solution of sodium cyanide which has passed through the tank for buffered-flltration flows between the inside wall of double wall-tank and the outsides of coil pipes with blades for heat exchange while 8o°C ⁇ 85°C of hot water flows between double walls of tank and through the insides of the coil pipes, so that mixed solvent can be distilled.
- the mixed solvent is evaporated and then condensed at a ⁇ 0 ⁇ 15°C condenser and is recycled.
- Crystal hydrate of sodium cyanide is shipped in the packed form of product on use for cyanation.
- Sodium cyanide for use in the form of plating liquid is packed in anhydrate state through first vacuum drying, moulding, and second drying.
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A process for the production of sodium cyanide with urea and sodium carbonate as main raw materials comprises: a) step for blending raw materials; b) step for first-order reaction; c) step for second-order reaction; d) step for centrifugal atomization; e) step for agitating and dissolving; f) step for precipitating and filtering; g) step for vacuum distillation; and h) step for centrifugal separating and drying. High purity (above 98%) of sodium cyanide finished product may be obtained.
Description
PROCESS FOR PRODUCTION OF SODIUM CYANIDE
Field of the invention
The present invention relates to a process for producing high purity(above 98%) of sodium cyanide with urea and sodium carbonate.
Background of the invention
There have been several methods for production of sodium cyanide including the method to refine HCN gas, that is, intermediate product of petroleum processing industry dnd chemical industry and absorb it into NaOH solution, the method to make metal sodium, bituminous coal and liquid ammonia react, and a method by methanol oxidation etc.
The purity of sodium cyanide produced by the above methods is 80% ~ 98%.
The defect of the above production methods is that there exist the environmental pollution by toxic gas, that is, HCN, high production cost and explosion danger and difficulty in obtaining higher purity than 98 %.
Objects of the invention
The object of the present invention is to provide a process for producing high purity (above 98 ) of sodium cyanide using urea and sodium carbonate as main raw materials.
Summary of the Invention
The present invention discloses a process for production of high purity (above 98%) of sodium cyanide using Urea and sodium carbonate.
Figure 1 shows the process diagram for production of sodium cyanide according to the present invention.
Detailed description of the Invention
The invention discloses a process for the production of sodium cyanide with urea and sodium carbonate as main raw materials comprising following steps. a) Step for mixing of raw materials
2.5-2.8:1 mol ratio of urea and sodium carbonate are charged a mixer with, and 200 mesh-sized iron powder and 200 mesh-sized anthracite coal powder mixed by 1:1 weight ratio are added by the quantity corresponding to 0.2-0.4 wt% of raw material, and then raw materials and additives are uniformly mixed. b) Step for first-order reaction
The mixture of urea, sodium carbonate and additives that passed the step for blending of raw materials is charged a reactor with and then the temperature of the reactor inside is held at 300-350 °C for 2 hours to make reactants of the mixture react. c) Step for second-order reaction
After the first-order reaction, the temperature of the reactor inside is held at 650-750 °C for 1 hour to make the first-order reaction product deoxidized. d) Step for centrifugal atomization
After second-order reaction, the product in melting state is dispersed and atomized by centrifugal force by a rotating-cylinder of which diameter is 600-800 mm and rotation speed is 400-600 rpm, and by rapid -cooling
Content of sodium cyanide in the obtained product is 62-68%. e) Step for agitation and dissolution
The atomized reaction-product is charged a dissolution tank with and a mixed solvent corresponding to 4 times the reaction product volume is added and then a mixture is obtained by agitating the atomized reaction product and the mixed solvent at 300 rpm for 20-30 min.
The mixed solvent consists of 5-20 %, preferably 8-15% of benzene aromatic compound, 30-45% preferably 35-42% of methanol (or ethanol) and water.
During the step for agitation and dissolution, sodium cyanide is fully dissolved into mixed solvent and un-reacted reactants including sodium carbonate remain as sediment. f) Step for precipitation and filtration
Sodium carbonate sediment is separated from the mixture(solution and sediment) which has passed through the step for agitation and dissolution by 200 mesh-sieve passage, while the pressure of system inside is 13.3~.40 KPa.
The separated sediment, namely, un-reacted sodium carbonate is recycled into the step for blending of raw material through the step for vacuum-drying.
The sodium cyanide solution which has passed the sieve is transferred into th¾ step for vacuum-distillation by vacuum of the system inside. g) Step for vacuum distillation
Step for vacuum distillation consists of filtering by a buffered filtration tank and distillation by a distiller, and the buffered filtration tank has 200 mesh sieve, so that sodium cyanide solution which has passed through the step for precipitation and filtration can be transferred into the distiller.
The distiller consists of a double-wall tank of which the inside has many coil pipes at some spaces with outside blades for heat exchange so as to increase evaporation speed.
Solution of sodium cyanide which has passed through the tank for buffered-flltration flows between the inside wall of double wall-tank and the outsides of coil pipes with blades for heat exchange while 8o°C~85°C of hot water flows between double walls of tank and through the insides of the coil pipes, so that mixed solvent can be distilled.
During distillation, the mixed solvent is evaporated and then condensed at a }0~15°C condenser and is recycled.
After some quan ity of sodium cyanide piles up on the ground of djstili!r, ft discharged Mn rapid-cooled under 35 'C.
By thjs step, solid sodium cyanidp js obtained and is fed info a step foj centrifugal separation-
h) Step for centrifugal separation and drying
After the mixed solvent is recovered at the step for vacuum distillation, leftover solid state of sodium cyanide becomes crystal hydrate of NaCN-2H2Q by removing residual solvent and moisture through centrifugal separator.
Crystal hydrate of sodium cyanide is shipped in the packed form of product on use for cyanation.
Sodium cyanide for use in the form of plating liquid is packed in anhydrate state through first vacuum drying, moulding, and second drying.
The purities of both crystal hydrate and anhydtate of sodium cyanide produced by the above method are above 98 %.
Claims
1. A process for the production of sodium cyanide with urea and sodium carbonate as raw materials, comprising;
a) step for mixing of raw materials
b) step for first-order reaction
c) step for second-order reaction
d) step for centrifugal atomization
e) step for agitation and dissolution
f) step for precipitating and filtering
g) step for vacuum distillation
h) step for centrifugal separating and drying
2. The process of Claim l wherein a) step for mixing of raw materials is characterized in that 2.5~2.8:i mol ratio of urea and sodium carbonate are charged the blender, and 200 mesh-sized iron powder and 200 mesh-sized anthracite coal powder mixed by 1:1 weight ratio are added by the quantity corresponding to 0.2-0.4 % of raw material, and then raw materials and additives are uniformly mixed.
3. The process of Claim 1 wherein b) step for first-order reaction is characterized in that the mixture of claim 2 is charged a reactor with and then the temperature of the reactor inside is hold at 300-350 °C for 2 hours to make the reactants of the mixture react.
4. The process of Claim 1 wherein c) step for second-order reaction is characterized in that the temperature of the reactor inside is hold at 650-750 °C for 1 hour to make the first-order reaction product deoxidized.
5. The process of Claim 1 wherein d) step for centrifugal atomization is characterized in that second-order reaction product in melting state is dispersed and atomized by centrifugal force by a rotating-cylinder and by rapid-cooling.
6. The process of Claim 1 wherein e) step for agitation and dissolution is characterized in that the atomized reaction-product is charged a dissolution tank with, a mixed solvent corresponding to 4 times the reaction product volume is added and then a mixture is obtained by agitating the atomizld reaction product and the mixed solvent for 20-30 min.
7. The step of Claim 6 wherein the mixed solvent is characterized in that it consists of 5~20 %, preferably 8-15% of benzene aromatic compound, 30-45% preferably 35-42% of methanol (or ethanol) and water
8. The process of Claim 1 wherein f) step is characterized in that sodium carbonate sediment is separated from the mixture of claim 6 by 200 mesh-sieve passage, and is sent to step for mixing of raw materials while the pressure of system inside is 13.3-40 KPa
9. The process of Claim 1 wherein g) step is characterized in that the solution product of f) step of claim 8 is re-filtered by 200 mesh-sieve in a tank for buffing-filtering, and then distilled by passing between the inside wall of a double-wall tank and the outsides of coil pipes with blades for heat exchange while 8o°C~85°C of hot water flows between double walls of tank and through the insides of the coil pipes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KP201515 | 2015-06-09 | ||
| KP201510002015 | 2015-06-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2016199944A1 true WO2016199944A1 (en) | 2016-12-15 |
Family
ID=57503743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KP2015/000039 WO2016199944A1 (en) | 2015-06-09 | 2015-11-01 | Process for production of sodium cyanide |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2016199944A1 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4929837B1 (en) * | 1964-04-10 | 1974-08-07 |
-
2015
- 2015-11-01 WO PCT/KP2015/000039 patent/WO2016199944A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4929837B1 (en) * | 1964-04-10 | 1974-08-07 |
Non-Patent Citations (3)
| Title |
|---|
| "Relationship of epsilon phase and process", CHINESE PEOPLE'S LIBERATION ARMY 3604TH FACTORY., 30 June 1975 (1975-06-30), pages 30 * |
| TIANJIN CHEMICAL RESEARCH INSTITUTE OF MINISTRY OF CHEMICAL INDUSTRY ET AL.: "3.7.11 Sodium Cyanate", CHEMICAL PRODUCTS HANDBOOK - INORGANIC CHEMICAL PRODUCTS, 31 October 1993 (1993-10-31), pages 379 - 380 * |
| TIANJIN CHEMICAL RESEARCH INSTITUTE OF MINISTRY OF CHEMICAL INDUSTRY ET AL.: "Sodium Cyanate", CHEMICAL PRODUCTS HANDBOOK - INORGANIC CHEMICAL PRODUCTS, 31 July 1982 (1982-07-31), pages 217 * |
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