PL159710B2 - Method of purifying waste gases and waters from a melamine production plant - Google Patents
Method of purifying waste gases and waters from a melamine production plantInfo
- Publication number
- PL159710B2 PL159710B2 PL27589288A PL27589288A PL159710B2 PL 159710 B2 PL159710 B2 PL 159710B2 PL 27589288 A PL27589288 A PL 27589288A PL 27589288 A PL27589288 A PL 27589288A PL 159710 B2 PL159710 B2 PL 159710B2
- Authority
- PL
- Poland
- Prior art keywords
- ammonia
- liquid
- column
- waste
- melamine
- Prior art date
Links
- 229920000877 Melamine resin Polymers 0.000 title abstract 6
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 title abstract 6
- 238000000034 method Methods 0.000 title abstract 4
- 238000004519 manufacturing process Methods 0.000 title abstract 3
- 239000002912 waste gas Substances 0.000 title 1
- 239000002351 wastewater Substances 0.000 title 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract 20
- 229910021529 ammonia Inorganic materials 0.000 abstract 9
- 239000007789 gas Substances 0.000 abstract 8
- 239000007788 liquid Substances 0.000 abstract 5
- 239000010808 liquid waste Substances 0.000 abstract 4
- 239000002699 waste material Substances 0.000 abstract 4
- 239000004202 carbamide Substances 0.000 abstract 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract 3
- 238000010521 absorption reaction Methods 0.000 abstract 2
- 238000000354 decomposition reaction Methods 0.000 abstract 2
- 238000004140 cleaning Methods 0.000 abstract 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
Landscapes
- Treating Waste Gases (AREA)
Abstract
The method for cleaning of gas waste and liquid waste from a melamine plant, consisting in that streams of gas waste and liquid waste are subject to the following operations in a continuous and closed cycle: decomposition of urea, expelling ammonia from the liquid waste, absorption of this ammonia together with ammonia from the gas waste and return to the melamine production process, characterised in that the ammonia expelling process is run in a stripping column under a pressure of approx. 0.5 MPa and at a temperature of approx. 100 degrees C using steam fed as counter-current to the lower part of the column under a pressure of 0.3 to 0.6 MPa, while in the central part of the column the solution of liquid waste is received which has no ammonia and contains urea and melamine and is then compressed to the pressure of 4 MPa and through a heat exchanger system directed to a hydrolyser where it is heated up to a temperature of approx. 210 to 230 degrees C and where the liquid is kept for approx. 40 to 60 minutes and then the solution thus obtained and containing products of urea decomposition is expanded and directed to the central part of the stripping column and from the top of this column vapours containing ammonia are received and then mixed with fresh gas waste from the melamine plant and the stream of hydrated ammonia from the NH3 liquefaction system are directed to the absorbing column where these gases are sprinkled with water and/or hydrated with ammonia at liquid to gas stream ratio between 5:1 and 10:1 by volume and then sprinkled with a cold steam condensate, or with a cold liquid from the stripping column with a liquid to gas stream ratio between 1:1 and 5:1 by volume upon which the liquid leaving the absorption column and containing ammonia is carried away to the process of melamine production, and the gases collected at the top of this column and pollutant-free are carried away to atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL27589288A PL159710B2 (en) | 1988-11-18 | 1988-11-18 | Method of purifying waste gases and waters from a melamine production plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL27589288A PL159710B2 (en) | 1988-11-18 | 1988-11-18 | Method of purifying waste gases and waters from a melamine production plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| PL275892A2 PL275892A2 (en) | 1989-08-21 |
| PL159710B2 true PL159710B2 (en) | 1992-12-31 |
Family
ID=20045077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PL27589288A PL159710B2 (en) | 1988-11-18 | 1988-11-18 | Method of purifying waste gases and waters from a melamine production plant |
Country Status (1)
| Country | Link |
|---|---|
| PL (1) | PL159710B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023104580A1 (en) | 2021-12-09 | 2023-06-15 | Basf Se | Process for treating triazine-containing wastewater |
-
1988
- 1988-11-18 PL PL27589288A patent/PL159710B2/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| PL275892A2 (en) | 1989-08-21 |
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