CN107311951A - A kind of melamine slow cooling crystallizes production method - Google Patents
A kind of melamine slow cooling crystallizes production method Download PDFInfo
- Publication number
- CN107311951A CN107311951A CN201710407448.9A CN201710407448A CN107311951A CN 107311951 A CN107311951 A CN 107311951A CN 201710407448 A CN201710407448 A CN 201710407448A CN 107311951 A CN107311951 A CN 107311951A
- Authority
- CN
- China
- Prior art keywords
- melamine
- crystallizer
- heat exchanger
- cold
- gas
- 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
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229920000877 Melamine resin Polymers 0.000 title claims abstract description 31
- 238000010583 slow cooling Methods 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 238000002425 crystallisation Methods 0.000 claims abstract description 15
- 230000008025 crystallization Effects 0.000 claims abstract description 15
- 230000008676 import Effects 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 12
- 238000010791 quenching Methods 0.000 claims abstract description 11
- 230000000171 quenching effect Effects 0.000 claims abstract description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000012495 reaction gas Substances 0.000 claims description 8
- 239000006227 byproduct Substances 0.000 claims description 6
- 239000002918 waste heat Substances 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
- C07D251/40—Nitrogen atoms
- C07D251/54—Three nitrogen atoms
- C07D251/62—Purification of melamine
-
- 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
- Y02P20/10—Process efficiency
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a kind of melamine slow cooling crystallizer, the melamine slow cooling crystallizer includes crystallizer main body, the top of crystallizer main body is provided with hot air intake, bottom is provided with powder outlet, it is characterized in that the upper semisection of crystallization phosphor bodies is provided with skirt shell type pipe heat exchanger, the lower semisection of crystallizer main body is gas phase quenching cooling chamber, and ring cooling chamber sets multiple cold air imports, and multiple mixed gas outlets are set in the top loop cooling chamber of cold air import.Due to using said structure, i.e., using two sections of falling temperature methods in crystallizer, energy consumption is reduced, recuperation of heat grade is improved.
Description
Technical field
The invention belongs to chemical production technical field, more particularly to a kind of melamine slow cooling crystallization production method.
Background technology
During the dry production of melamine, the melamine of generation is to be present in reaction in a gaseous form at 350 DEG C
In gas, less than 300 DEG C are cooled to, gaseous melamine can be made to sublimate, becomes powdering melamine and separates out.If being changed with conventional
Hot mode cools, and the melamine powder largely separated out can block heat exchanger tube, heat exchanger channels, makes production process be difficult to continue.
At present, the main gas phase quenching one-step method using domestic independent research of the production of China's melamine, so-called " gas phase
Quenching ", is substantially that in crystallizer, 350 DEG C of pyroreaction gas is cooled to 210 by being blended with 146 DEG C of low temperature purification gas
DEG C, make melamine crystallization precipitation.
There is problems with the production process：One is that air conditioning quantity is usually more than 4 times of load volume, and the preparation of cold air is needed
Consume substantial amounts of power；Two be to carry a small amount of urea in cold air secretly and remained with metal erosion thing, into crystallizer in pollute crystallization
The product of precipitation；Three be to react air cooling and the temperature drop process of crystallization to decline reaction gas recuperation of heat amount and recuperation of heat grade, is made
Into energy dissipation.
The content of the invention
The mesh of the present invention is to provide a kind of melamine slow cooling crystallization production method, in same crystallizer, using compound
Cooling method, completes reaction gas cooling, the process of melamine crystallization precipitation.
The purpose of the present invention is achieved through the following technical solutions, and the melamine slow cooling crystallizer includes crystallizer master
Body, the top of crystallizer main body is provided with hot air intake, and bottom is provided with powder outlet, and the upper semisection of crystallization phosphor bodies is provided with skirt shell type
Pipe heat exchanger, the lower semisection of crystallizer main body is gas phase quenching cooling chamber, and ring cooling chamber sets multiple cold air imports, in cold air
The top loop cooling chamber of import sets multiple mixed gas outlets.
It is preferred that, skirt shell type pipe heat exchanger, which includes one, to be connected by the cross over pipe of cold medium, and with cross over pipe
The heat exchanger tube of many longitudinal arrangements connect.
It is preferred that, one end of cross over pipe is cold medium entrance, and the other end exports for cold medium
The cooling medium of skirt shell type pipe heat exchanger can select hot water (or conduction oil).
350 DEG C of thermal response gas enters crystallizer main body by the hot gas inlet on top, is changed from top to bottom through skirt shell type tubular type
Discharged after hot device cooling by exchanger base, strictly control temperature at this and be not less than 300 DEG C, separated out and block there will be no crystallization
Heat exchanger.
Reaction gas liberated heat is taken out of by hot water (or conduction oil), passes through waste heat boiler by-product ＞ 1.3-3.8MPa water
Steam.
The gas for going out heat exchanger runs into 136 DEG C of cold wind that Cool gas blower is sent, hot and cold gas mixing on cold air import top
Temperature is changed into 210 DEG C afterwards, while being separated out with substantial amounts of melamine powder.
The most of powdery melamine separated out is crystallized, by gravitational settling to crystalliser feet, a small amount of powder is passed through with air-flow
Mixed gas outlet, into product separator below, further completes the depth separation of powdery melamine.
Beneficial effects of the present invention：
Due to using said structure, i.e., using two sections of falling temperature methods in crystallizer, and mixed gas outlet is located at cold air inlet
Top.Bring following effect：
1st, 350 DEG C of reaction gas is cooled to 300 DEG C through heat exchanger, and cold air requirement can be made to decline 35%, made accordingly cold
Power consumption prepared by gas declines.
2nd, original 350 DEG C of reaction gas is changed into 210 DEG C through quenching, is sent to liquid area washing procedure below, by-product
0.2MPa low pressure water vapors.Now with the medium pressure steam of 35% heat by-product 1.3--3.8MPa pressure, the part of waste heat
Recuperation of heat grade is improved.
3rd, near exit is set to quenching area, is easy to powdery melamine to settle.Powder is discharged from bottom, can reduce follow-up point
Powder from equipment purifies pressure.
Brief description of the drawings
The embodiment that the invention will now be described in detail with reference to the accompanying drawings
Fig. 1 is sectional view of the invention
In figure：1st, crystallizer main body 2, hot air intake 3, powder outlet 4, opotism formula pipe heat exchanger 5, quenching cooling
Room 6, cold air import 7, mixed gas outlet 8, cross over pipe 9, heat exchanger tube 10, cold medium entrance 11, cold medium outlet
Embodiment
Embodiment one：As shown in figure 1, the melamine crystallizer of composite algorithm cooling includes crystallizer main body 1, crystallizer
The top of main body 1 is provided with hot air intake 2, and bottom is provided with powder outlet 3, and the upper semisection of crystallization phosphor bodies 1 is provided with skirt shell type tubular type
Heat exchanger 4, skirt shell type pipe heat exchanger 4 includes one can be by the cross over pipe 8 of cold medium, and is connected with cross over pipe 8
The heat exchanger tube 9 of many longitudinal arrangements, the lower semisection of crystallizer main body 1 is gas phase quenching cooling chamber 5, and ring cooling chamber 5 sets 10
Cold air import 6,10 mixed gas outlets 7 are set in the top loop quenching cooling chamber 5 of cold air import 6.Skirt shell type pipe heat exchanger
Cooling medium can select hot water, 350 DEG C of thermal response gas enters crystallizer main body 1 by the hot gas inlet 2 on top, from upper
Discharged after the lower cooling through skirt shell type pipe heat exchanger 4 by exchanger base, strictly control temperature at this and be not less than 300 DEG C, just
Do not have crystallization and separate out blocking heat exchanger.
Hot water in heat exchanger tube is sent from waste heat boiler, enters heat exchanger by cold medium entrance 10, through cross over pipe 8 be distributed into
Enter to each heat exchanger tube 9, after absorbing reaction gas cooling liberated heat, with air-liquid azeotrope, go out through cross over pipe, cold medium
Mouth enters the water vapour of waste heat boiler by-product ＞ 3.8MPa pressure.
The gas for going out heat exchanger runs into 136 DEG C of cold wind that Cool gas blower is sent, hot and cold gas mixing on cold air import top
Temperature is changed into 210 DEG C afterwards, while being separated out with substantial amounts of melamine powder.
The most of powdery melamine separated out is crystallized, by gravitational settling to crystalliser feet, a small amount of powder is passed through with air-flow
Mixed gas outlet, enters product separator below, further completes the depth separation of powdery melamine.
Embodiment two：As shown in figure 1, the melamine crystallizer of composite algorithm cooling includes crystallizer main body 1, crystallizer
The top of main body 1 is provided with hot air intake 2, and bottom is provided with powder outlet 3, and the upper semisection of crystallization phosphor bodies 1 is provided with skirt shell type tubular type
Heat exchanger 4, skirt shell type pipe heat exchanger 4 includes one can be by the cross over pipe 8 of cold medium, and is connected with cross over pipe 8
The heat exchanger tube 9 of many longitudinal arrangements, the lower semisection of crystallizer main body 1 is gas phase quenching cooling chamber 5, and ring cooling chamber 5 sets 12
Cold air import 6,12 mixed gas outlets 7 are set in the top loop cooling chamber 5 of cold air import 6.Skirt shell type pipe heat exchanger it is cold
But medium selects conduction oil, and 350 DEG C of thermal response gas enters crystallizer main body 1 by the hot gas inlet 2 on top, from top to bottom through skirt
Shell type pipe heat exchanger 4 is discharged after cooling by exchanger base, is strictly controlled temperature at this and is not less than 300 DEG C, there will be no
Crystallization, which is separated out, blocks heat exchanger.
Conduction oil in heat exchanger tube is sent from oil pump, enters heat exchanger by cold medium entrance 10, is distributed and is entered through cross over pipe
To each heat exchanger tube 9, absorbing reaction gas cools after liberated heat, and temperature is improved to 250 DEG C or so, through cross over pipe, cold medium
The water vapour of waste heat boiler by-product ＞ 1.3MPa pressure is entered in outlet 11.
The gas for going out heat exchanger runs into 136 DEG C of cold wind that Cool gas blower is sent on the top of cold air import 6, and hot and cold gas is mixed
Temperature is changed into 210 DEG C after conjunction, while being separated out with substantial amounts of melamine powder.
The most of powdery melamine separated out is crystallized, by gravitational settling to crystalliser feet, a small amount of powder is passed through with air-flow
Mixed gas outlet 3, enters product separator below, further completes the depth separation of powdery melamine.
Claims (5)
1. a kind of melamine slow cooling crystallizer, the melamine slow cooling crystallizer includes crystallizer main body, crystallizer main body
Top is provided with hot air intake, and bottom is provided with powder outlet, it is characterised in that the upper semisection of crystallization phosphor bodies is provided with skirt shell type tubular type
Heat exchanger, the lower semisection of crystallizer main body is gas phase quenching cooling chamber, and ring cooling chamber sets multiple cold air imports, in cold air import
Top loop cooling chamber multiple mixed gas outlets are set.
2. a kind of melamine slow cooling crystallizer as claimed in claim 1, it is characterised in that skirt shell type pipe heat exchanger includes
One can be by the heat exchanger tube of the cross over pipe of cold medium, and many longitudinal arrangements being connected with cross over pipe.
3. a kind of melamine slow cooling crystallizer as claimed in claim 1, it is characterised in that one end of cross over pipe is cold medium
Entrance, the other end exports for cold medium.
4. a kind of melamine slow cooling crystallizer as claimed in claim 1, it is characterised in that skirt shell type pipe heat exchanger it is cold
But medium can select hot water or conduction oil.
5. a kind of melamine slow cooling crystallizes production method, it is characterised in that 350 DEG C of thermal response gas by top hot gas inlet
Into crystallizer main body, discharged after cooling from top to bottom through skirt shell type pipe heat exchanger by exchanger base, strictly control this
Place's temperature is not less than 300 DEG C, is separated out there will be no crystallization and blocks heat exchanger；Reaction gas liberated heat is by hot water (or conduction oil)
Take out of, pass through waste heat boiler by-product ＞ 1.3-3.8MPa water vapour；Go out heat exchanger gas run on cold air import top it is cold
Temperature is changed into 210 DEG C after 136 DEG C of cold wind that gas blower fan is sent, hot and cold gas mixing, while with substantial amounts of melamine powder
Separate out；The most of powdery melamine separated out is crystallized, by gravitational settling to crystalliser feet, a small amount of powder is blended with air-flow
Gas is exported, and into product separator below, further completes the depth separation of powdery melamine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710407448.9A CN107311951A (en) | 2017-05-24 | 2017-05-24 | A kind of melamine slow cooling crystallizes production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710407448.9A CN107311951A (en) | 2017-05-24 | 2017-05-24 | A kind of melamine slow cooling crystallizes production method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107311951A true CN107311951A (en) | 2017-11-03 |
Family
ID=60183547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710407448.9A Pending CN107311951A (en) | 2017-05-24 | 2017-05-24 | A kind of melamine slow cooling crystallizes production method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107311951A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10229101A1 (en) * | 2001-11-16 | 2003-07-17 | Agrolinz Melamin Gmbh Linz | Purifying off-gases from a high-pressure melamine plant comprises contacting the gases first with a recycle urea melt containing melamine precursors and ammonia and then with fresh urea melt |
| CN103102320A (en) * | 2013-01-17 | 2013-05-15 | 李鑫 | Production method of melamine by slow cooling crystallization |
| CN104292173A (en) * | 2014-09-08 | 2015-01-21 | 山东省舜天化工集团有限公司 | Melamine crystallizer-based gas heat recovery method |
-
2017
- 2017-05-24 CN CN201710407448.9A patent/CN107311951A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10229101A1 (en) * | 2001-11-16 | 2003-07-17 | Agrolinz Melamin Gmbh Linz | Purifying off-gases from a high-pressure melamine plant comprises contacting the gases first with a recycle urea melt containing melamine precursors and ammonia and then with fresh urea melt |
| CN103102320A (en) * | 2013-01-17 | 2013-05-15 | 李鑫 | Production method of melamine by slow cooling crystallization |
| CN104292173A (en) * | 2014-09-08 | 2015-01-21 | 山东省舜天化工集团有限公司 | Melamine crystallizer-based gas heat recovery method |
Non-Patent Citations (2)
| Title |
|---|
| 冯建民等: "中国三聚氰胺生产应用现状及产业技术分析" * |
| 崔立宝: "新型三聚氰胺装置的设计与研究" * |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171103 |
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| WD01 | Invention patent application deemed withdrawn after publication |