CN105218470A - Solid and gas tripping device in a kind of Melamine Production - Google Patents
Solid and gas tripping device in a kind of Melamine Production Download PDFInfo
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- CN105218470A CN105218470A CN201510517616.0A CN201510517616A CN105218470A CN 105218470 A CN105218470 A CN 105218470A CN 201510517616 A CN201510517616 A CN 201510517616A CN 105218470 A CN105218470 A CN 105218470A
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- 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
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- 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
- C07D251/56—Preparation of melamine
- C07D251/60—Preparation of melamine from urea or from carbon dioxide and ammonia
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The present invention relates to the solid and gas tripping device in a kind of Melamine Production, comprise the crystallizer be connected with vulcanization bed and cold blast engine, crystallizer outlet is in turn connected into product cyclonic separator, solid-gas separator, gas blower and urine and washes tower, and urine is washed tower periphery and arranged urea melting tank, at least one column cyclonic separator and an air collector respectively.The invention has the advantages that: the solid-gas separator of increase can reclaim trimeric cyanamide 1 ~ 1.5 continuously? t/h, reduce the trimeric cyanamide brought in liquid urinary system, huge promoter action will be had to the prolongation system cloud gray model cycle, during liquid can be made to urinate, content of melamine drops to less than 1%, greatly reduce maintenance number of times, save a large amount of manpower and material resources.
Description
Technical field
The invention belongs to chemical production field, in particular to the solid and gas tripping device in a kind of Melamine Production, the trimeric cyanamide carried in separating technology gas is carried out by novel solid and gas tripping device, thus reach being separated of gas ammonia and trimeric cyanamide, reduce the circulation of trimeric cyanamide in process gas, optimize the quality of process gas, improve the yield of trimeric cyanamide.
Background technology
Trimeric cyanamide uses very extensive, is polymerized and can obtains melamine resin, can be used for plastics and coatings industry, also can do the anti-folding of yarn fabric, anti-shrinking agent with formaldehyde condensation.Its modified resin can do lovely luster, the metallic paint that durable, hardness is good.It also can be used for firm, heat-resisting fancy veneer, and building paper and grey leather are tanned the caking agent of skin agent, synthesizing fireproof laminate, the fixing agent of water-resisting agent or stiffening agent etc.Be obtained 582 melamine resins of raw material by trimeric cyanamide, formaldehyde, butanols.As the flow agent of solvent borne polyurethane coating, effect spy is good.
In preparation technology of melamine, in a fluidized bed reactor, trimeric cyanamide is produced in pyrolysis under 400 DEG C of high temperature gas flows and catalyst action, polymerization to urea.Institute's heat requirement heats fused salt by molten salt furnace to be provided with reaction gas indirect heat exchange again, and fused salt circulates between molten salt furnace and fluidized-bed as heating agent.The reaction out of self-fluidized type bed bioreactor generates gas, after the raw interchanger heat exchange in road, after the impurity in primary cyclone initial gross separation unstripped gas, filter after silica gel ash impurity through hot-air filter, enter the crystallizer of crystallization workshop section, with the cold air mixed crystallization from Cool gas blower, form finished product trimeric cyanamide.Solid and gas is separated through finished product cyclonic separator by finished product and system process gas, and finished product enters packaging system through separator bottom discharge system.
Process gas after finished product cyclonic separation is mainly containing the ammonia of 35%, the CO of 65%
2, carry more trimeric cyanamide in technique secretly, being recycled to content of melamine in liquid urine can reach 8% to 10%, comparatively large to liquid urine qualitative effects, then affects liquid urinary system life cycle.
Summary of the invention
The object of the invention is exactly carry out solid and gas separation further to the process gas after finished product cyclonic separation, reduces the trimeric cyanamide brought in liquid urinary system.
Technical scheme of the present invention is as follows:
Solid and gas tripping device in a kind of Melamine Production, comprise the crystallizer be connected with vulcanization bed and cold blast engine, crystallizer outlet is in turn connected into product cyclonic separator, gas blower and urine wash tower, urine is washed tower and is divided three sections, interchanger is provided with in epimere, stage casing is gas phase section, hypomere is liquid phase section, gas blower is connected to urine and washes tower epimere, one urea melting tank is set, urea melting tank washes tower epimere with urine respectively and hypomere is connected, one liquid urine recycle pump is set and washes tower epimere with urine and hypomere is connected, it is characterized in that: finished product cyclonic separator be connected in series a solid-gas separator between gas blower, separately arrange at least one column cyclonic separator, the import of column cyclonic separator is connected in urine and washes tower epimere, and the gaseous phase outlet of column cyclonic separator is connected to that urine washes midsection, liquid-phase outlet is connected to urine and washes tower hypomere.
On the basis of above-mentioned technique scheme, following further technical scheme can be had:
Urine is washed midsection and is connected an air collector, and air collector outlet is connected to crystallizer and Carrier Gas Compressor respectively.
In the present invention, in Melamine Production, the trend of process gas in solid and gas tripping device is:
1) filter after silica gel ash impurity through hot-air filter after the impurity in primary cyclone initial gross separation unstripped gas after the reaction out of self-fluidized type bed bioreactor generates the raw interchanger heat exchange in Qi Jing road, enter the crystallizer of crystallization workshop section, with the cold air mixed crystallization from Cool gas blower, form finished product trimeric cyanamide.
2) solid and gas is separated through finished product cyclonic separator by finished product and system process gas, and finished product enters packaging system through separator bottom discharge system.
3) process gas carry 8% ~ 10% trimeric cyanamide after novel solid-gas separator is separated, in process gas, content of melamine is lower than 1%, utilizes cold air gas blower to deliver to promote flow pressure to carrier gas blower fan after urine washes tower washing to deliver to fluidized-bed and again recycle.
4) isolated trimeric cyanamide continuous print discharging is reclaimed trimeric cyanamide 1 ~ 1.5t/h by novel solid-gas separator.
The invention has the advantages that: utilize a kind of novel solid and gas tripping device, further the process gas after finished product cyclonic separation is carried out solid and gas separation again by utilizing solid and gas proportion method that is different and reduction gas flow rate, reduce the trimeric cyanamide brought in liquid urinary system, so will there is huge promoter action to the prolongation system cloud gray model cycle, if content of melamine drops to less than 1% in liquid can being made to urinate by technological transformation, greatly reduce maintenance number of times, save a large amount of manpower and material resources.
Accompanying drawing illustrates:
Fig. 1 is the structure principle chart of the solid and gas tripping device in the present invention.
As shown in Figure 1, solid and gas tripping device in a kind of Melamine Production provided by the invention, comprise the crystallizer be connected with vulcanization bed and cold blast engine, crystallizer outlet is in turn connected into product cyclonic separator, cold blower and urine and washes tower, urine is washed tower and is divided three sections, interchanger is provided with in epimere, stage casing is gas phase section, hypomere is liquid phase section, gas blower is connected to urine and washes tower epimere, one urea melting tank is set, urea melting tank washes tower epimere with urine respectively and hypomere is connected, and arranges a liquid urine recycle pump and washes tower epimere with urine and hypomere is connected.
Finished product cyclonic separator be connected in series a solid-gas separator between gas blower; Separately arrange at least one column cyclonic separator, the import of column cyclonic separator is connected in urine and washes tower epimere, and the gaseous phase outlet of column cyclonic separator is connected to that urine washes midsection, liquid-phase outlet is connected to urine and washes tower hypomere.
Urine is washed midsection and is connected an air collector, and air collector outlet is connected to crystallizer and Carrier Gas Compressor respectively.
The solid-gas separator adopted in technique scheme, column cyclonic separator are all the known products that market is purchased.
Example one:
After the reaction out of self-fluidized type bed bioreactor generates the raw interchanger heat exchange in Qi Jing road, impurity in primary cyclone initial gross separation unstripped gas, filters after silica gel ash impurity through hot-air filter, enters the crystallizer of crystallization workshop section, with the cold air mixed crystallization from Cool gas blower, form finished product trimeric cyanamide.Solid and gas is separated through finished product cyclonic separator by finished product and system process gas, and finished product enters packaging system through separator bottom discharge system.Process gas is (main containing the ammonia of 35%, the CO of 65%
2) carry the trimeric cyanamide of 8% after novel solid-gas separator is separated, in the process gas flowed out, content of melamine reduces to 0.6%, this process gas utilizes air-blowing blower fan to deliver to urine Xi Ta upper end, process gas after liquid urine washing heat exchange enters column cyclonic separator, and after being separated, process gas enters that urine washes midsection, liquid urine enters urine and washes tower hypomere.
Enter the process gas that urine washes midsection, a road is delivered to fluidized-bed to Carrier Gas Compressor lifting flow pressure again recycle to the trimeric cyanamide in crystallizer recycling process gas, another road.1t/h is reached through the isolated trimeric cyanamide of solid-gas separator.
Example two:
After the reaction out of self-fluidized type bed bioreactor generates the raw interchanger heat exchange in Qi Jing road, impurity in primary cyclone initial gross separation unstripped gas, filters after silica gel ash impurity through hot-air filter, enters the crystallizer of crystallization workshop section, with the cold air mixed crystallization from Cool gas blower, form finished product trimeric cyanamide.Solid and gas is separated through finished product cyclonic separator by finished product and system process gas, and finished product enters packaging system through separator bottom discharge system.Process gas carries the trimeric cyanamide of 9% after novel solid-gas separator is separated, content of melamine 0.7% in process gas, utilize cold air gas blower to deliver to after urine washes tower washing, process gas one road after the washing of liquid urine promotes flow pressure and delivers to fluidized-bed to crystallizer, another road to Carrier Gas Compressor and again recycle.1.18t/h is reached through the isolated trimeric cyanamide of solid-gas separator.
Example three:
After the reaction out of self-fluidized type bed bioreactor generates the raw interchanger heat exchange in Qi Jing road, impurity in primary cyclone initial gross separation unstripped gas, filters after silica gel ash impurity through hot-air filter, enters the crystallizer of crystallization workshop section, with the cold air mixed crystallization from Cool gas blower, form finished product trimeric cyanamide.Solid and gas is separated through finished product cyclonic separator by finished product and system process gas, and finished product enters packaging system through separator bottom discharge system.Process gas carries the trimeric cyanamide of 10% after novel solid-gas separator is separated, content of melamine 0.9% in process gas, process gas one road after the washing of liquid urine is delivered to fluidized-bed to Carrier Gas Compressor lifting flow pressure again recycle to crystallizer, another road.1.5t/h is reached through the isolated trimeric cyanamide of solid-gas separator.
Effect of the present invention refers to following table:
Contrast information slip before and after transformation
Content of melamine analytical procedure in urine:
Get liquid area containing trimeric cyanamide after decrease temperature crystalline, get this crystal of 10g and be dissolved in completely in 300ml distilled water.By different solubility separation of melamine in water of trimeric cyanamide and urea and urea, utilize quantitative paper to filter, trimeric cyanamide is filtered out, calculates content of melamine.
Claims (2)
1. the solid and gas tripping device in a Melamine Production, comprise the crystallizer be connected with vulcanization bed and cold blast engine, crystallizer outlet is in turn connected into product cyclonic separator, gas blower and urine wash tower, urine is washed tower and is divided three sections, interchanger is provided with in epimere, stage casing is gas phase section, hypomere is liquid phase section, gas blower is connected to urine and washes tower epimere, one urea melting tank is set, urea melting tank washes tower epimere with urine respectively and hypomere is connected, one liquid urine recycle pump is set and washes tower epimere with urine and hypomere is connected, it is characterized in that: finished product cyclonic separator be connected in series a solid-gas separator between gas blower, separately arrange at least one column cyclonic separator, the import of column cyclonic separator is connected in urine and washes tower epimere, and the gaseous phase outlet of column cyclonic separator is connected to that urine washes midsection, liquid-phase outlet is connected to urine and washes tower hypomere.
2. the solid and gas tripping device in a kind of Melamine Production according to claim 1, is characterized in that: urine is washed midsection and connected an air collector, and air collector outlet is connected to crystallizer and Carrier Gas Compressor respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510517616.0A CN105218470A (en) | 2015-08-22 | 2015-08-22 | Solid and gas tripping device in a kind of Melamine Production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510517616.0A CN105218470A (en) | 2015-08-22 | 2015-08-22 | Solid and gas tripping device in a kind of Melamine Production |
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| CN105218470A true CN105218470A (en) | 2016-01-06 |
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| CN201510517616.0A Pending CN105218470A (en) | 2015-08-22 | 2015-08-22 | Solid and gas tripping device in a kind of Melamine Production |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108745208A (en) * | 2018-05-04 | 2018-11-06 | 辛集市九元化工有限责任公司 | The energy saver and method of dissolved solid urea in a kind of Melamine Production |
| CN109678808A (en) * | 2017-10-19 | 2019-04-26 | 山东华鲁恒升化工股份有限公司 | The cold and hot shunting energy saving technique of the deep clean of melamine product production equipment and device |
| CN113620844A (en) * | 2021-08-06 | 2021-11-09 | 四川金象赛瑞化工股份有限公司 | Dicyandiamide crystallization separation method and device |
| CN113828117A (en) * | 2021-10-18 | 2021-12-24 | 山东省舜天化工集团有限公司 | Melamine discharging waste gas treatment and recycling system and method |
| CN115073389A (en) * | 2022-07-01 | 2022-09-20 | 山东省舜天化工集团有限公司 | Energy-saving melamine production system and production method |
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| CN1646503A (en) * | 2002-03-25 | 2005-07-27 | 欧洲技术集团股份有限公司 | Process for the production of melamine from urea, and particularly for the separation of melamine from off-gas |
| CN101863848A (en) * | 2010-05-28 | 2010-10-20 | 北京烨晶科技有限公司 | System and method for preparing melamine |
| CN102219754A (en) * | 2011-04-28 | 2011-10-19 | 四川金圣赛瑞化工有限责任公司 | Energy-saving and resource-saving system and process for producing melamine by using gas-phase quenching process |
| CN102584730A (en) * | 2012-03-12 | 2012-07-18 | 李靖铭 | Equipment and process for producing melamine under low pressure |
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Patent Citations (7)
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109678808A (en) * | 2017-10-19 | 2019-04-26 | 山东华鲁恒升化工股份有限公司 | The cold and hot shunting energy saving technique of the deep clean of melamine product production equipment and device |
| CN108745208A (en) * | 2018-05-04 | 2018-11-06 | 辛集市九元化工有限责任公司 | The energy saver and method of dissolved solid urea in a kind of Melamine Production |
| CN113620844A (en) * | 2021-08-06 | 2021-11-09 | 四川金象赛瑞化工股份有限公司 | Dicyandiamide crystallization separation method and device |
| CN113828117A (en) * | 2021-10-18 | 2021-12-24 | 山东省舜天化工集团有限公司 | Melamine discharging waste gas treatment and recycling system and method |
| CN115073389A (en) * | 2022-07-01 | 2022-09-20 | 山东省舜天化工集团有限公司 | Energy-saving melamine production system and production method |
| CN115073389B (en) * | 2022-07-01 | 2023-10-31 | 山东省舜天化工集团有限公司 | Energy-saving melamine production system and production method |
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Application publication date: 20160106 |
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