CN1657526A - Process for preparing melamine - Google Patents
Process for preparing melamine Download PDFInfo
- Publication number
- CN1657526A CN1657526A CN 200410023590 CN200410023590A CN1657526A CN 1657526 A CN1657526 A CN 1657526A CN 200410023590 CN200410023590 CN 200410023590 CN 200410023590 A CN200410023590 A CN 200410023590A CN 1657526 A CN1657526 A CN 1657526A
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- CN
- China
- Prior art keywords
- gas
- ammonia
- hot
- heat
- water cooler
- Prior art date
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- 0 C*C(C1)C1C1=CC=CC1 Chemical compound C*C(C1)C1C1=CC=CC1 0.000 description 2
- KDYXLWIHFKXAFG-MWYNGPNVSA-N CCC(CCC1)CC1[C@H]1CC[C@@H](C)CC1 Chemical compound CCC(CCC1)CC1[C@H]1CC[C@@H](C)CC1 KDYXLWIHFKXAFG-MWYNGPNVSA-N 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
A process for preparing melamine includes such steps as reaction to generate material gas, cooling in hot gas cooler by hot water, filtering, crystallizing, separating solid product from gas, absorbing Co2 from said gas to obtain pure ammonia gas, compressing, using part of compressed ammonia as the fluidizing gas of reactor and using the rest as cooling medium of crystallizer.
Description
Technical field:
The present invention relates to field of chemical engineering, particularly a kind of Production of Cyanuramide technology.
Background technology:
Present Production of Cyanuramide technology, be generally liquid area and drop into fluidized-bed reactor, the process stream gas that comes out from reactor enters the hot gas water cooler, utilization will be led angerization and lower the temperature, make high boiling point by-products producedly to come out with solid crystal, lead living reheat hot water, enter the circulation of hot gas water cooler after being condensed.Process stream gas after being cooled enters the solid impurity in the hot gas filtration device filtering gas, gas after the filtration enters crystallizer and the reverse contact heat-exchanging of technology cold air of urinating washing system from liquid, trimeric cyanamide is separated out from process stream gas with the solid form, and the trimeric cyanamide solid is packaged after separating.Gas after the separation is delivered to washing of liquid urine washing system and cooling by blower fan, and the gas after the cooling divides three the tunnel, the one tunnel as the technology cold air device that decrystallizes through separating after, and one the tunnel as circulation gas dereaction device, and one the tunnel as the tail gas aspiration receipts that truncate.The shortcoming of this production technique is that technical process is long, complicated operation, quality product is difficult to guarantee, and lead give birth to belong to inflammable, toxic substance, bigger to the human body infringement.
Summary of the invention:
The invention provides a kind of Production of Cyanuramide technology, this invention has overcome the shortcoming of existing production technique, and technology is simple, and is easy to operate, and construction investment is few
Production technique of the present invention is: the process stream gas that comes out from reactor, enter the cooling of hot gas water cooler, the heat-eliminating medium of hot gas water cooler is a hot water, replace the original life of leading, the heat technologic gas that is cooled enters strainer and filters, filter the solid granule in the heat technologic gas, gas after the filtration enters crystallizer, the ammonia reverse contact heat-exchanging next with the ammonia cabinet, trimeric cyanamide in the process gas is sublimated and is separated out, the trimeric cyanamide solid is the feeding storehouse packing after separating, and the gas after the separation advances carbon dioxide absorption tower and absorbs, and the gas after the absorption is pure ammonia, advance the ammonia cabinet with compressor compresses, divide two-way from gas holder, one tunnel dereaction device is done fluidized gas usefulness, and one tunnel device that decrystallizes is done cold air and used.
The characteristics of production technique of the present invention are: in fluidized-bed reactor, with pure ammonia is fluidized gas, this with present Production of Cyanuramide technology in ammonia, the gas mixture of carbonic acid gas be fluidized gas relatively, the former is more favourable for the preparation of trimeric cyanamide, and higher selectivity is arranged.At the shell side of the hot gas water cooler heat-eliminating medium of hot water as process stream gas, with give birth to relatively to lead in the present Production of Cyanuramide technology as the heat-eliminating medium of process stream gas, it is simple that the former has flow process, and potential danger is little, advantages such as one-time investment province.Cold air is pure ammonia in crystallizer, with present ammonia, carbon dioxide mix gas is that cold air compares, because the latter is through the washing of liquid urine washing system, separate in the unavoidable gas in back and carry liquid urine secretly, contain micro-liquid urine in the trimeric cyanamide material for making clothes thereby cause, the trimeric cyanamide difficult quality guarantee, and the former has avoided this situation and Tc to be easy to control.For gas compressor because compression medium is pure ammonia, with present ammonia, carbon dioxide mix gas be compression medium relatively, the device fabrication difficulty descends, and imports and exports pipeline and auxiliary facility because of need not considering ammonia, the easy crystallization of carbonic acid gas and easily disposing.
Description of drawings:
Fig. 1 is existing process flow sheet
Fig. 2 is a process flow sheet of the present invention
Embodiment:
From Fig. 1, Fig. 2 relatively sees, the technical process of the Melamine Production of former technology is long, complicated operation, and quality product is difficult to guarantee.And technology of the present invention is simple, and is easy to operate, and construction investment is few, good product quality, and raw material consumption is low.
Claims (7)
1, a kind of Production of Cyanuramide technology, it is characterized in that this technology is the material gas that reactor comes out, enter the hot gas water cooler, the heat-eliminating medium of hot gas water cooler is a hot water, replaces the original life of leading, and the heat technologic gas that is cooled enters strainer and filters, filter laggard crystallizer, reverse contact of ammonia with the ammonia storage cabinet comes crystallizes out the NH of gas at this triamine
3, CO
2Reach other gas material gas and enter carbon dioxide absorption tower, remove CO
2After gas enter the ammonia cabinet with compressor compresses, divide two-way from the ammonia cabinet, one tunnel dereaction device is done fluidized gas usefulness, one road gas device that decrystallizes is done cold air and is used.
2, the method for claim 1, the heat-eliminating medium that it is characterized in that the hot gas water cooler is a hot water, or air, or ammonia.
3, the method for claim 1 is characterized in that the cold air that crystallizing melamine is used is the pure ammonia that comes from the ammonia cabinet.
4, the method for claim 1, it is characterized in that the dereaction device do fluidized gas for pure ammonia.
5, equipment as claimed in claim 1 comprises reactor, hot gas water cooler, strainer, crystallizer, carbon dioxide absorption tower, compressor.
6, equipment as claimed in claim 2 is characterized in that doing heat-eliminating medium with hot water, the hot gas water cooler of cooling heat process gas.
7, equipment as claimed in claim 1, compressor promptly can adopt radial compressor, also can adopt reciprocating compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410023590 CN1657526A (en) | 2004-02-17 | 2004-02-17 | Process for preparing melamine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410023590 CN1657526A (en) | 2004-02-17 | 2004-02-17 | Process for preparing melamine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1657526A true CN1657526A (en) | 2005-08-24 |
Family
ID=35007246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410023590 Pending CN1657526A (en) | 2004-02-17 | 2004-02-17 | Process for preparing melamine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1657526A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101973948A (en) * | 2010-09-11 | 2011-02-16 | 山东省舜天化工集团有限公司 | Method for producing melamine |
| CN102584730A (en) * | 2012-03-12 | 2012-07-18 | 李靖铭 | Equipment and process for producing melamine under low pressure |
| CN102603661A (en) * | 2012-03-12 | 2012-07-25 | 李靖铭 | Process of using medium-pressure gas-phase quenching method to produce melamine |
| 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 |
-
2004
- 2004-02-17 CN CN 200410023590 patent/CN1657526A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101973948A (en) * | 2010-09-11 | 2011-02-16 | 山东省舜天化工集团有限公司 | Method for producing melamine |
| CN101973948B (en) * | 2010-09-11 | 2013-03-27 | 山东省舜天化工集团有限公司 | Method for producing melamine |
| CN102584730A (en) * | 2012-03-12 | 2012-07-18 | 李靖铭 | Equipment and process for producing melamine under low pressure |
| CN102603661A (en) * | 2012-03-12 | 2012-07-25 | 李靖铭 | Process of using medium-pressure gas-phase quenching method to produce melamine |
| CN102584730B (en) * | 2012-03-12 | 2014-08-27 | 李靖铭 | Equipment and process for producing melamine under low pressure |
| CN102603661B (en) * | 2012-03-12 | 2014-10-22 | 李靖铭 | Process of using medium-pressure gas-phase quenching method to produce melamine |
| 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 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |