CN111408389A - Composite catalyst for urea catalytic hydrolysis reaction - Google Patents
Composite catalyst for urea catalytic hydrolysis reaction Download PDFInfo
- Publication number
- CN111408389A CN111408389A CN202010319585.9A CN202010319585A CN111408389A CN 111408389 A CN111408389 A CN 111408389A CN 202010319585 A CN202010319585 A CN 202010319585A CN 111408389 A CN111408389 A CN 111408389A
- Authority
- CN
- China
- Prior art keywords
- hydrolysis reaction
- composite catalyst
- urea
- phosphate
- dihydrogen phosphate
- 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
- 239000003054 catalyst Substances 0.000 title claims abstract description 20
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 239000004202 carbamide Substances 0.000 title claims abstract description 18
- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 18
- 239000002131 composite material Substances 0.000 title claims abstract description 12
- 230000003197 catalytic effect Effects 0.000 title claims description 8
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004254 Ammonium phosphate Substances 0.000 claims abstract description 11
- 229910000148 ammonium phosphate Inorganic materials 0.000 claims abstract description 11
- 235000019289 ammonium phosphates Nutrition 0.000 claims abstract description 11
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims abstract description 8
- 235000019799 monosodium phosphate Nutrition 0.000 claims abstract description 8
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000002904 solvent Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 14
- 239000000126 substance Substances 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000004140 cleaning Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000007062 hydrolysis Effects 0.000 description 5
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 4
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 4
- 235000019837 monoammonium phosphate Nutrition 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229910000162 sodium phosphate Inorganic materials 0.000 description 2
- 239000001488 sodium phosphate Substances 0.000 description 2
- 235000011008 sodium phosphates Nutrition 0.000 description 2
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical group [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/14—Phosphorus; Compounds thereof
- B01J27/16—Phosphorus; Compounds thereof containing oxygen, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr
- B01J27/18—Phosphorus; Compounds thereof containing oxygen, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr with metals other than Al or Zr
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/08—Preparation of ammonia from nitrogenous organic substances
- C01C1/086—Preparation of ammonia from nitrogenous organic substances from urea
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Abstract
The invention discloses a composite catalyst for urea hydrolysis reaction, which comprises sodium dihydrogen phosphate and ammonium phosphate which are combined according to a certain molar ratio. The composite catalyst provided by the invention can inhibit the generation of crystalline substances, soften and dissolve the crystalline substances in the process of being applied to urea hydrolysis reaction, is beneficial to cleaning the inside of reactor equipment, and reduces the corrosivity of the equipment due to the alkalization of working medium solution.
Description
Technical Field
The invention relates to a composite catalyst for urea catalytic hydrolysis reaction.
Background
In the process of preparing ammonia by urea catalytic hydrolysis, analytically pure ammonium dihydrogen phosphate is mixed with 50 percent of urea solution according to a certain proportion, and the mixture is heated to 135-160 ℃ to accelerate urea hydrolysis to generate ammonia gas. Wherein the ammonium dihydrogen phosphate acts as a catalyst in the chemical reaction.
The chemical reaction is as follows:
(NH2)2CO+3H2O→CO2↑+2NH4OH
2NH4OH+2NH4H2PO4→2(NH4)2HPO4+2H2O
2(NH4)2HPO4→2NH4H2PO4+2NH3↑
in the actual engineering operation process, the catalytic action of ammonium dihydrogen phosphate to urea hydrolysis is good, but if the temperature is less than 116 ℃ in the operation process, easy crystallization, equipment pipeline dead angle is in the low temperature state for a long time and can end white blocky thing, and this crystal performance nature is: colorless and transparent, does not burn and melt at 500 ℃ in an alcohol lamp ignition test, and hardly dissolves at 100 ℃ in a normal pressure boiling water test. Under the long-term operation reaction, more and more crystallisates are in the reactor, which not only affects the yield of the prepared ammonia gas, but also has certain corrosivity on reaction equipment and is not beneficial to the long-term operation of the equipment.
Disclosure of Invention
The invention relates to a composite catalyst for urea catalytic hydrolysis reaction, which is used for reducing the generation of crystal.
In order to realize the purpose, the method adopted by the invention is as follows: the composite catalyst for urea hydrolysis reaction has sodium dihydrogen phosphate and ammonium phosphate as solute and desalted water as solvent.
The molar ratio of the solute is, sodium dihydrogen phosphate: ammonium phosphate 3: 1.
The temperature of the desalted water is 40-60 ℃.
The beneficial effects are as follows: the composite catalyst provided by the invention can inhibit the generation of crystalline substances, soften and dissolve the crystalline substances in the process of being applied to urea hydrolysis reaction, is beneficial to cleaning the inside of reactor equipment, and reduces the corrosivity of the equipment due to the alkalization of working medium solution.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims and abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The composite catalyst for urea hydrolysis reaction comprises sodium dihydrogen phosphate and ammonium phosphate as solutes and desalted water as a solvent, wherein the molar ratio of the solutes to the ammonium dihydrogen phosphate is as follows: ammonium phosphate is 3:1, and the temperature of the desalted water is 40-60 ℃.
Sodium dihydrogen phosphate and ammonium phosphate were mixed according to a ratio of 3:1, both existing in ionic form, corresponding to a ratio of 3: 1. the excess solute is sodium phosphate in the same number of moles as ammonium phosphate.
The catalyst solution has a certain acidic process, namely certain corrosivity, and a dissolving tank of the catalyst solution is preferably designed and manufactured by adopting 316L or 304L low-carbon austenitic stainless steel, in the catalyst dissolving process, 40-60 ℃ demineralized water is firstly added, the amount of the demineralized water is not less than 10% of the total volume of the reactor equipment, so that the catalyst solute is prevented from being hydrolyzed, separated out or burnt excessively in the temperature and pressure raising process, the demineralized water can avoid crystallization and pitting corrosion in the reactor, ammonium phosphate is firstly added for stirring and dissolving, sodium dihydrogen phosphate is added for dissolving after the ammonium phosphate is completely dissolved, the solution is always alkaline in the process, and the alkaline solution has no corrosivity on the stainless steel, so that the dissolving equipment can be protected, and when the catalyst solution is conveyed to a urea hydrolysis reactor, the temperature of the catalyst solution is controlled at 50 ℃, and the generation of ammonia gas caused by the hydrolysis of the sodium phosphate is avoided.
The catalyst of the invention has the advantages that:
1. can inhibit the generation of crystalline substances in the urea catalytic hydrolysis reaction, soften and dissolve the crystalline substances and facilitate the discharge;
2. the crystal of the solution in the reactor can be removed by simple steam purging and desalting water boiling;
3. in the reaction process, the working medium solution is alkalized, so that the corrosion to equipment is reduced, and the reactor equipment is protected.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel group of steps disclosed.
Claims (3)
1. The composite catalyst for urea hydrolysis reaction features that the solute is sodium dihydrogen phosphate and ammonium phosphate and the solvent is desalted water.
2. The composite catalyst for urea catalytic hydrolysis reaction according to claim 1, wherein the molar ratio of the solute is, sodium dihydrogen phosphate: ammonium phosphate =3: 1.
3. Composite catalyst for urea hydrolysis reaction according to claim 1, characterized in that the temperature of the demineralized water is 40-60 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010319585.9A CN111408389A (en) | 2020-04-22 | 2020-04-22 | Composite catalyst for urea catalytic hydrolysis reaction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010319585.9A CN111408389A (en) | 2020-04-22 | 2020-04-22 | Composite catalyst for urea catalytic hydrolysis reaction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111408389A true CN111408389A (en) | 2020-07-14 |
Family
ID=71485650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010319585.9A Pending CN111408389A (en) | 2020-04-22 | 2020-04-22 | Composite catalyst for urea catalytic hydrolysis reaction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111408389A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111924859A (en) * | 2020-08-10 | 2020-11-13 | 华东理工大学 | Method for preparing ammonia gas by catalytic hydrolysis of urea |
| CN115057454A (en) * | 2022-06-28 | 2022-09-16 | 江苏国瑞特环保工程技术有限公司 | Strong alkaline environment improvement type urea hydrolysis ammonia production system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040101464A1 (en) * | 2002-11-21 | 2004-05-27 | Burton Brooks | Method of quantitatively producing ammonia from urea |
| CN103395801A (en) * | 2013-08-08 | 2013-11-20 | 中国大唐集团环境技术有限公司 | Method and device for catalytic hydrolysis of urea |
| CN105129817A (en) * | 2015-08-10 | 2015-12-09 | 大唐环境产业集团股份有限公司 | Flue gas SCR denitration urea catalytic hydrolysis ammonia production system and method |
| CN110775986A (en) * | 2019-11-20 | 2020-02-11 | 北京新叶能源科技有限公司 | Urea catalytic hydrolysis ammonia production equipment and preparation method thereof |
-
2020
- 2020-04-22 CN CN202010319585.9A patent/CN111408389A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040101464A1 (en) * | 2002-11-21 | 2004-05-27 | Burton Brooks | Method of quantitatively producing ammonia from urea |
| CN103395801A (en) * | 2013-08-08 | 2013-11-20 | 中国大唐集团环境技术有限公司 | Method and device for catalytic hydrolysis of urea |
| CN105129817A (en) * | 2015-08-10 | 2015-12-09 | 大唐环境产业集团股份有限公司 | Flue gas SCR denitration urea catalytic hydrolysis ammonia production system and method |
| CN110775986A (en) * | 2019-11-20 | 2020-02-11 | 北京新叶能源科技有限公司 | Urea catalytic hydrolysis ammonia production equipment and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111924859A (en) * | 2020-08-10 | 2020-11-13 | 华东理工大学 | Method for preparing ammonia gas by catalytic hydrolysis of urea |
| CN111924859B (en) * | 2020-08-10 | 2023-03-10 | 华东理工大学 | Method for preparing ammonia gas by catalytic hydrolysis of urea |
| CN115057454A (en) * | 2022-06-28 | 2022-09-16 | 江苏国瑞特环保工程技术有限公司 | Strong alkaline environment improvement type urea hydrolysis ammonia production system |
| CN115057454B (en) * | 2022-06-28 | 2023-06-23 | 江苏国瑞特环保工程技术有限公司 | High alkaline environment improvement type urea hydrolysis ammonia production system |
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|---|---|---|---|
| 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 |
Application publication date: 20200714 |
|
| RJ01 | Rejection of invention patent application after publication |