CN110668469A - Method for producing cyanamide by positive pressure absorption of carbon dioxide - Google Patents
Method for producing cyanamide by positive pressure absorption of carbon dioxide Download PDFInfo
- Publication number
- CN110668469A CN110668469A CN201911078940.1A CN201911078940A CN110668469A CN 110668469 A CN110668469 A CN 110668469A CN 201911078940 A CN201911078940 A CN 201911078940A CN 110668469 A CN110668469 A CN 110668469A
- Authority
- CN
- China
- Prior art keywords
- carbon dioxide
- cyanamide
- producing
- positive pressure
- kettle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 114
- XZMCDFZZKTWFGF-UHFFFAOYSA-N Cyanamide Chemical compound NC#N XZMCDFZZKTWFGF-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 57
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 57
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 12
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 31
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 30
- MYFXBBAEXORJNB-UHFFFAOYSA-N calcium cyanamide Chemical compound [Ca+2].[N-]=C=[N-] MYFXBBAEXORJNB-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000012452 mother liquor Substances 0.000 claims abstract description 17
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 230000004907 flux Effects 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000008235 industrial water Substances 0.000 claims description 2
- 239000010413 mother solution Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 14
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 2
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 abstract 2
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 238000004321 preservation Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 6
- 239000000706 filtrate Substances 0.000 description 4
- 230000002194 synthesizing effect Effects 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 2
- CVSVTCORWBXHQV-UHFFFAOYSA-N creatine Chemical compound NC(=[NH2+])N(C)CC([O-])=O CVSVTCORWBXHQV-UHFFFAOYSA-N 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
- GTCAXTIRRLKXRU-UHFFFAOYSA-N methyl carbamate Chemical compound COC(N)=O GTCAXTIRRLKXRU-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000005648 plant growth regulator Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- KCURWTAZOZXKSJ-JBMRGDGGSA-N 4-amino-1-[(2r,3s,4s,5r)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]pyrimidin-2-one;hydron;chloride Chemical compound Cl.O=C1N=C(N)C=CN1[C@H]1[C@@H](O)[C@H](O)[C@@H](CO)O1 KCURWTAZOZXKSJ-JBMRGDGGSA-N 0.000 description 1
- MVXMNHYVCLMLDD-UHFFFAOYSA-N 4-methoxynaphthalene-1-carbaldehyde Chemical compound C1=CC=C2C(OC)=CC=C(C=O)C2=C1 MVXMNHYVCLMLDD-UHFFFAOYSA-N 0.000 description 1
- XOHBRLLZSIGHDE-UHFFFAOYSA-N 5-amino-1,2-dihydro-1,2,4-triazol-3-one Chemical compound NC1=NC(=O)NN1 XOHBRLLZSIGHDE-UHFFFAOYSA-N 0.000 description 1
- 241000167854 Bourreria succulenta Species 0.000 description 1
- TWFZGCMQGLPBSX-UHFFFAOYSA-N Carbendazim Natural products C1=CC=C2NC(NC(=O)OC)=NC2=C1 TWFZGCMQGLPBSX-UHFFFAOYSA-N 0.000 description 1
- 239000005506 Diclofop Substances 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 241000219094 Vitaceae Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- HNYOPLTXPVRDBG-UHFFFAOYSA-N barbituric acid Chemical compound O=C1CC(=O)NC(=O)N1 HNYOPLTXPVRDBG-UHFFFAOYSA-N 0.000 description 1
- 239000006013 carbendazim Substances 0.000 description 1
- JNPZQRQPIHJYNM-UHFFFAOYSA-N carbendazim Chemical compound C1=C[CH]C2=NC(NC(=O)OC)=NC2=C1 JNPZQRQPIHJYNM-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000019693 cherries Nutrition 0.000 description 1
- 229960003624 creatine Drugs 0.000 description 1
- 239000006046 creatine Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- ZIPLUEXSCPLCEI-UHFFFAOYSA-N cyanamide group Chemical group C(#N)[NH-] ZIPLUEXSCPLCEI-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005059 dormancy Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 235000021021 grapes Nutrition 0.000 description 1
- 150000002357 guanidines Chemical class 0.000 description 1
- 230000000749 insecticidal effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- KVNYFPKFSJIPBJ-UHFFFAOYSA-N ortho-diethylbenzene Natural products CCC1=CC=CC=C1CC KVNYFPKFSJIPBJ-UHFFFAOYSA-N 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229940124530 sulfonamide Drugs 0.000 description 1
- 150000003456 sulfonamides Chemical class 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C3/00—Cyanogen; Compounds thereof
- C01C3/16—Cyanamide; Salts thereof
Abstract
The invention belongs to the technical field of chemical industry, and particularly relates to a method for producing cyanamide by positively-pressuring absorption of carbon dioxide. Adding mother liquor into a synthesis kettle, introducing carbon dioxide, controlling the pressure in the kettle to be 0.2-1.0 MPa, adding lime nitrogen according to the proportion, controlling the temperature in the synthesis kettle to be less than or equal to 30 ℃ and the PH to be less than or equal to 8.5, after the feeding is finished, continuously introducing the carbon dioxide, keeping the temperature for a period of time, and then performing pressure relief, discharging and filtering to obtain a cyanamide product. The method improves the single cyanogen production process, absorbs carbon dioxide at positive pressure to produce the single cyanamide, improves the reaction efficiency and reduces the unit consumption of the carbon dioxide.
Description
Technical Field
The invention belongs to the technical field of chemical industry, and particularly relates to a method for producing cyanamide by positively-pressuring absorption of carbon dioxide.
Background
Cyanamide is a medical raw material and an intermediate, is mainly used for producing cytarabine hydrochloride, 3-amino-5-hydroxy 1, 2, 4-triazole and the like, is also an organic synthetic raw material, such as producing cyanuramide, dicyandiamide, methyl carbamate and the like, and further producing medicines of barbituric acid, sulfonamides, various guanidine salts, pesticide-diclofop, carbendazim, creatine and the like. The cyanamide can be used as a plant growth regulator in agriculture, has insecticidal and bactericidal effects, is a good dormancy terminator particularly in the production of cherries and grapes, can bring about early flowering and fruiting, increase the yield and change the fruit meat quality.
The physicochemical properties of the product are as follows: the crystal cyanamide is unstable, is colorless crystalline solid, is rhombic, colorless, is easy to damp and has a melting point of 42 ℃. It is soluble in water, ethanol, diethyl ether and benzene, insoluble in ethylene oxide, and can volatilize with water vapor and be toxic. The 50.0% water solution is colorless liquid with specific weight of 1.0724, and cyanamide has high solubility in water, weak acidity and complete mutual solubility with water at 43 deg.C. 30.0% of cyanamide is obtained by adding acid into the aqueous suspension of calcium cyanamide, is an important organic synthesis intermediate, is especially widely applied to the synthesis of medicines and pesticides, and can be used as a plant growth regulator.
In the existing process for synthesizing cyanamide, the inside of a synthesis kettle is under slight negative pressure, a large amount of carbon dioxide is not reacted and is discharged as tail gas, the utilization rate of the carbon dioxide is low, the reaction efficiency is low, and the unit consumption of the carbon dioxide is high.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for producing cyanamide by absorbing carbon dioxide at positive pressure, which changes the inside of a synthesis kettle into positive pressure absorption, improves the utilization rate of carbon dioxide, improves the reaction rate, reduces the unit consumption of carbon dioxide, and can reduce the unit consumption of carbon dioxide by more than 30 percent by adopting positive pressure absorption compared with micro-negative pressure synthesis of cyanamide.
The method specifically comprises the following steps:
adding mother liquor into a synthesis kettle, introducing carbon dioxide, controlling the pressure in the kettle to be 0.2-1.0 MPa, adding lime nitrogen according to the proportion, controlling the temperature in the synthesis kettle to be less than or equal to 30 ℃ and the PH to be less than or equal to 8.5, after the feeding is finished, continuously introducing the carbon dioxide, keeping the temperature for a period of time, and then performing pressure relief, discharging and filtering to obtain a cyanamide product.
The mother solution is a cyanamide solution or water washing water or industrial water obtained by washing cyanamide slag, wherein the cyanamide solution can be a cyanamide aqueous solution, or a cyanamide solution obtained after a cyanamide synthesis process is used (a small amount of dicyandiamide and the like may be contained in the cyanamide solution), and the mass percentage of the cyanamide in the cyanamide solution is preferably 5-9%.
Under normal temperature and normal pressure, the solubility of carbon dioxide in water is 0.878L/Kg (water), and at 0.2MPa and 20 ℃, the solubility can reach 1.72L/Kg (water), and at 1.0MPa and 20 ℃, the solubility at 20 ℃ is 7.85L/Kg (water). Preferably, the pressure in the kettle is controlled to be 0.5-1.0 MPa.
In the process of synthesizing the cyanamide, the pH of the feed liquid needs to be kept neutral or weakly acidic. In general, in the synthesis process, the pH can be reduced to about 6 at the lowest level due to the characteristics of the feed liquid, so the bottom line is not required. However, if the pH is too high, generally above 9, the pH will start to polymerize in large amounts to form dicyandiamide, and if the temperature is too high, the dicyandiamide content will increase, and if the temperature and the pH are not appropriate, the danger index will be increased, and the yield of the dicyandiamide will be reduced, so that the temperature in the synthesis kettle will be controlled to be less than or equal to 30 ℃ and the pH will be less than or equal to 8.5. More preferably, the temperature in the synthesis vessel is controlled to 20 to 25 ℃.
Preferably, the content of the available nitrogen of the lime nitrogen is more than or equal to 21%, and the mass ratio of the mother liquor to the lime nitrogen is 2-6: 1. If the solid-liquid ratio in the synthesis kettle is too high, the mass of the lime nitrogen/the mass of the mother liquor are too high, so that the feed liquid in the synthesis kettle is too viscous, the solubility of carbon dioxide is reduced, the reaction is slow, and the reaction time is prolonged. If the solid-to-liquid ratio is too low, the yield of cyanamide per kettle is affected.
Preferably, the ratio of the lime nitrogen feeding speed (t/h) to the carbon dioxide flux (t/h) is 0.5-3.0: 1. Therefore, the lime nitrogen fed in can be ensured to react immediately, the loss of effective nitrogen is reduced, and the yield of the cyanamide is improved. The larger the carbon dioxide flux, the lower this ratio, but too low a ratio, a large amount of carbon dioxide is wasted without participating in the reaction. The ratio of lime nitrogen feeding speed (t/h) to carbon dioxide flux (t/h) is preferably 1-2: 1, and more preferably 1.2-1.8: 1.
Preferably, the heat preservation time is 0-45 min, so that the residual lime nitrogen in the synthesis kettle can be completely reacted. The preferable heat preservation time is 10-20min, and more preferably 15min, so that the energy consumption can be reduced while the complete reaction is ensured.
The method improves the production process of the cyanamide, and replaces the existing micro-negative pressure process for synthesizing the cyanamide with the process for synthesizing the cyanamide by positive pressure absorption. The cyanamide is synthesized by positive pressure absorption, the utilization rate of carbon dioxide is improved, the reaction rate is improved, and the unit consumption of carbon dioxide is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
1) Putting 4m into a synthesis kettle3Introducing carbon dioxide into the mother liquor (the mother liquor is an aqueous solution containing 7% of cyanamide and 0.2% of dicyandiamide), and controlling the pressure in the kettle to be 0.8 MPa; adding 1.3t of lime nitrogen according to the mass of the mother liquor; the feeding speed is 0.325t/h, and the ratio of the feeding speed to the carbon dioxide flux is controlled to be 1.4: 1, controlling the temperature in the synthesis kettle to be 21-23 ℃ and the PH to be less than or equal to 8.5; and after feeding for 4 hours, finishing feeding. And continuously introducing carbon dioxide, keeping the temperature for 15min, starting pressure relief after the heat preservation is finished, and discharging and filtering after the pressure relief is finished.
After filtration, the filtrate was 3.5m3Wherein, the content of the cyanamide is 19.17 percent, the content of the dicyandiamide is 0.23 percent, and the yield of the cyanamide is 98.3 percent. And converting the filtered cyanamide solution into a 30% cyanamide solution, and calculating the unit consumption of carbon dioxide by 0.72t/t in the synthesis process. The effective nitrogen content of the lime nitrogen in this example is 21%.
Example 2
Putting 4m into a synthesis kettle3Introducing carbon dioxide into the mother liquor (the mother liquor is a cyanamide solution, the content of the cyanamide is 7%), and controlling the pressure in the kettle to be 0.9 MPa; adding lime nitrogen 1.2t according to the mass of the mother liquor; controlling the ratio of the feeding speed to the carbon dioxide flux to be 1.5: 1, controlling the temperature in the synthesis kettle to be 22-25 ℃ and the PH to be less than or equal to 8.5; and after feeding for 3 hours, finishing feeding, continuously introducing carbon dioxide for heat preservation for 15min, starting pressure relief after heat preservation is finished, and discharging and filtering after pressure relief is finished.
After filtration, the filtrate was 3.5m3Wherein, the content of the cyanamide is 19.19 percent, the content of the dicyandiamide is 0.23 percent, and the yield of the cyanamide is 98.5 percent. And converting the filtered cyanamide solution into a 30% cyanamide solution, and calculating the unit consumption of carbon dioxide by 0.67t/t in the synthesis process. The effective nitrogen content of the lime nitrogen in this example is 21%.
Example 3
Putting 4m into a synthesis kettle3Introducing carbon dioxide into the mother liquor (the mother liquor is washing water obtained by washing cyanamide slag with water), and controlling the pressure in the kettle to be 1.0 MPa; adding 1.3t of lime nitrogen according to the mass of the mother liquor; according to the feeding speed, controlling the ratio of the feeding speed to the carbon dioxide flux to be 1.6: 1, controlling the temperature in the synthesis kettle to be 21-24 ℃ and the PH to be less than or equal to 8.5; and after feeding for 4 hours, finishing feeding, continuously introducing carbon dioxide for heat preservation for 15min, starting pressure relief after heat preservation is finished, and discharging and filtering after pressure relief is finished.
After filtration, the filtrate was 3.5m3Wherein the content of the cyanamide is 19.30 percent, the content of the dicyandiamide is 0.23 percent, and the yield of the cyanamide is 99.5 percent. And converting the filtered cyanamide solution into a 30% cyanamide solution, and calculating the unit consumption of carbon dioxide in the synthesis process to be 0.62 t/t. The effective nitrogen content of the lime nitrogen in this example is 21%.
Comparative example
Adding 3m into the synthesis kettle3And (5) introducing carbon dioxide into the mother liquor, and starting a fan to enable the pressure in the kettle to be micro negative pressure. And adding 1.3t of lime nitrogen according to the mass of the mother liquor. According to the feeding speed, controlling the ratio of the feeding speed to the carbon dioxide flux to be 0.9: 1, controlling the temperature in the synthesis kettle to be 22-25 ℃ and the PH to be less than or equal to 8.5; feeding for 4.5h, then keeping on introducing carbon dioxide for heat preservation for 15min, and then feedingAnd discharging the materials.
After filtration, the filtrate was 3.5m3Wherein the content of the cyanamide is 18.68 percent, the content of the dicyandiamide is 0.24 percent, and the yield of the cyanamide is 94 percent. And converting the filtered cyanamide solution into a 30% cyanamide solution, and calculating to obtain 1.13t/t of carbon dioxide consumption in the synthesis process. The effective nitrogen content of lime nitrogen in this comparative example was 21%
In conclusion, compared with the prior art of the comparative example, the method of the invention has the advantages that the unit consumption of carbon dioxide is reduced by nearly 50%, the utilization rate of carbon dioxide is greatly improved, the reaction rate is improved, and the unit consumption of carbon dioxide is reduced.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The method for producing cyanamide by positively absorbing carbon dioxide is characterized by comprising the following steps: adding mother liquor into a synthesis kettle, introducing carbon dioxide, controlling the pressure in the kettle to be 0.2-1.0 MPa, adding lime nitrogen according to a proportion, controlling the temperature in the synthesis kettle to be less than or equal to 30 ℃ and the PH to be less than or equal to 8.5, after the feeding is finished, continuously introducing the carbon dioxide, keeping the temperature for a period of time, and then performing pressure relief, discharging and filtering to obtain a cyanamide product; the mother solution is cyanamide solution or water washing water or industrial water obtained by washing cyanamide slag with water.
2. The method for producing cyanamide by absorbing carbon dioxide under positive pressure according to claim 1, wherein the mass percentage of cyanamide in the cyanamide solution is 5-9%.
3. The method for producing cyanamide by absorbing carbon dioxide under positive pressure according to claim 1, wherein the mass ratio of the cyanamide aqueous solution mother liquor to the lime nitrogen is 2-6: 1.
4. The method for producing cyanamide by absorbing carbon dioxide under positive pressure according to claim 1 or 3, wherein the content of available nitrogen in lime nitrogen is not less than 20%.
5. The method for producing cyanamide by absorbing carbon dioxide under positive pressure according to claim 1, wherein the ratio of the lime nitrogen feeding speed t/h to the carbon dioxide flux t/h is 0.5-3.0: 1.
6. The method for producing cyanamide by positively-pressuring absorption of carbon dioxide according to claim 1, wherein the pressure in the kettle is controlled to be 0.5 to 1.0 MPa.
7. The method for producing cyanamide by absorbing carbon dioxide under positive pressure according to claim 1, wherein the temperature in the synthesis kettle is controlled to be 20-25 ℃.
8. The method for producing cyanamide by positively-pressuring absorption of carbon dioxide according to claim 1, wherein the holding time is 0-45 min.
9. The method for producing cyanamide by positive pressure absorption of carbon dioxide as claimed in claim 8, wherein the holding time is 10-20 min.
10. The method for producing cyanamide by positive pressure absorption of carbon dioxide as claimed in claim 9, wherein the holding time is 15 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911078940.1A CN110668469A (en) | 2019-11-06 | 2019-11-06 | Method for producing cyanamide by positive pressure absorption of carbon dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911078940.1A CN110668469A (en) | 2019-11-06 | 2019-11-06 | Method for producing cyanamide by positive pressure absorption of carbon dioxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110668469A true CN110668469A (en) | 2020-01-10 |
Family
ID=69086448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911078940.1A Pending CN110668469A (en) | 2019-11-06 | 2019-11-06 | Method for producing cyanamide by positive pressure absorption of carbon dioxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110668469A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5017355A (en) * | 1988-05-18 | 1991-05-21 | Nippon Carbide Kogyo Kabushiki Kaisha | Process for producing cyanamide |
| CN104163439A (en) * | 2014-06-13 | 2014-11-26 | 宁夏宝马化工集团有限公司 | Synthetic method of cyanamide aqueous solution by using sodium hydroxide |
| CN104445276A (en) * | 2014-12-08 | 2015-03-25 | 古浪鑫辉化工有限公司 | Method for efficiently preparing monocyanamide solution |
| CN105540612A (en) * | 2015-12-08 | 2016-05-04 | 山东益丰生化环保股份有限公司 | Method for reducing dicyandiamide content in solution containing 30% of cyanamide |
| CN108991017A (en) * | 2018-06-25 | 2018-12-14 | 山东益丰生化环保股份有限公司 | A kind of preparation method of 30% cyanamide aqueous solution |
-
2019
- 2019-11-06 CN CN201911078940.1A patent/CN110668469A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5017355A (en) * | 1988-05-18 | 1991-05-21 | Nippon Carbide Kogyo Kabushiki Kaisha | Process for producing cyanamide |
| CN104163439A (en) * | 2014-06-13 | 2014-11-26 | 宁夏宝马化工集团有限公司 | Synthetic method of cyanamide aqueous solution by using sodium hydroxide |
| CN104445276A (en) * | 2014-12-08 | 2015-03-25 | 古浪鑫辉化工有限公司 | Method for efficiently preparing monocyanamide solution |
| CN105540612A (en) * | 2015-12-08 | 2016-05-04 | 山东益丰生化环保股份有限公司 | Method for reducing dicyandiamide content in solution containing 30% of cyanamide |
| CN108991017A (en) * | 2018-06-25 | 2018-12-14 | 山东益丰生化环保股份有限公司 | A kind of preparation method of 30% cyanamide aqueous solution |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4251255A (en) | Agrochemical agents and their use | |
| CN105540612B (en) | A method of reducing dicyandiamide content in 30% cyanamide solution | |
| CN104926724B (en) | Naphthalene-dicarboxamide-contained bisquaternary ammonium salt type plant growth regulator | |
| CN106831592B (en) | A kind of preparation method of naphthenic acid | |
| CN103950899A (en) | Calcium peroxide preparation method | |
| RU2127714C1 (en) | Organic fertilizer and process for preparing thereof | |
| CN101434563B (en) | Preparation of creatine monohydrate | |
| CN110668469A (en) | Method for producing cyanamide by positive pressure absorption of carbon dioxide | |
| CN110606496B (en) | Method for continuously producing cyanamide | |
| CN103167872B (en) | For the production of the method for VBT tartrate | |
| CN103524389A (en) | Method for preparing pesticide methomyl | |
| CN111484426A (en) | Method for synthesizing aminoacetonitrile hydrochloride from hydrocyanic acid | |
| CN111018747A (en) | Method for refining guanidine nitrate | |
| CN110697733B (en) | Method for producing high-purity solid cyanamide | |
| CN110697734B (en) | Preparation method for continuously synthesizing phosphorus-free cyanamide | |
| CN102583443B (en) | Method for producing ammonium sulfate by using ammonium bicarbonate as main raw material | |
| CN111961077B (en) | Preparation method of beta sodium glycerophosphate containing crystal water | |
| CN101033202A (en) | Organic acid stabilizer and preparation of its percarbonateamide | |
| CN104693073A (en) | Preparation method for creatine nitrate | |
| CN108484505B (en) | Preparation method of 2-methylimidazole | |
| CN106831440A (en) | The preparation method of the ferrisodium of ethylenediamine two | |
| RU2492651C1 (en) | Stimulator of plant growth and method of its obtaining | |
| CN105924398A (en) | Allantoin production method | |
| CN102336685B (en) | Method for preparing cyanoacetic acid through continuous dehydration | |
| CA3098826A1 (en) | Process for the desulphurization of materials and/or residues containing lead sulphate employing an amino compound |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200110 |