SU681001A1 - Method of the purification of waste liquors from aminooxoderivatives of s-triazine - Google Patents
Method of the purification of waste liquors from aminooxoderivatives of s-triazineInfo
- Publication number
- SU681001A1 SU681001A1 SU782585307A SU2585307A SU681001A1 SU 681001 A1 SU681001 A1 SU 681001A1 SU 782585307 A SU782585307 A SU 782585307A SU 2585307 A SU2585307 A SU 2585307A SU 681001 A1 SU681001 A1 SU 681001A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- triazine
- purification
- aminooxoderivatives
- melamine
- waste liquors
- Prior art date
Links
Landscapes
- Removal Of Specific Substances (AREA)
Description
Изобретение относитс к способам очистки сточных вод, содержащих аминооксопроиэводные S-триазина (меламин , аммелин, аммелид, циануровуго кислоту) и образующихс в процессах производства меламина, циануровой кислоты и других производных триазина . Известен способ очистки сточных вод (маточных растворов) меламина, включающий добавление циануровой кислоты в нейтральной, слабощелочной или кислой среде и отделение выпавшего осадка цианурата меламина от раствора 1. Сточные воды, имеющие щелочнуюреакцию , подкисл ют дл того, чтобы совместно с циануратом меламина в осадок выпали аммелид и аммелин, растворимые в щелочах. Наиболее близким-к предлагаемому по технической сущности и достигаемому результату вл етс способ очис ки сточных вод, содержащих аминоокс производные S-триаэина, согласно ко торому к сточным водам добавл ют циануровую кислоту,- подкисл ют их, пропуска двуокись углерода,отдел ют полученный осадок смеси аммелина, аммелида и цианурата меламина .фильт рованием и подвергают раствор дальнейшей обработке дл разрьтаени оставшихс в нем примесей 2. Отделенный осадок в дальнейшем используют дл получени циануровой кислоты путем гидролиза меламина, аммелина и аммелида в кислой среде. Дл очистки по этому способу сточных вод, в которых преобладающим компонентом вл етс цианурова кислота , можно добавл ть к ним меламин и выполн ть последующие операции точно так же. Недостатком этого способа вл -. ютс затруднени , возникающие при фильтрации раствора от осадка Ьмеси цианурата меламина, аглмелида и аммелина . Эти затруднени вызваны мелкодисперсностью осадка, что приводит к неприменимости тканевых фильтров, которые очень быстро забиваютс ос;1Дком и- тер ют фильтрующую способность. Использование зернистых фильтров с инертным сыпучим материалом (например , песком, кизельгуром и т.п.) приводит к образованию больших количеств отходов фильтрующего материала, загр зненного 1минооксотриазинами. Отходы эти не могут быть утилизироваThis invention relates to methods for treating wastewater containing aminooxy ester S-triazine (melamine, ammeline, ammelide, cyanic acid) and formed in the processes of production of melamine, cyanuric acid and other triazine derivatives. A known method for purifying wastewater (mother liquors) of melamine involves adding cyanuric acid in a neutral, slightly alkaline or acidic medium and separating the precipitated melamine cyanurate precipitate from solution 1. The alkaline effluent is acidified to form a precipitate together with melamine cyanura dropped ammelide and ammeline, soluble in alkalis. The closest to the proposed technical essence and the achieved result is the method of purification of sewage containing aminoox derivatives of S-triaine, according to which cyanuric acid is added to the effluent, acidifying them, passing carbon dioxide, separating the resulting precipitate mixtures of ammeline, ammelide, and cyanurate melamine. filtering and subject the solution to further processing to disintegrate the remaining impurities 2. The separated precipitate is further used to obtain cyanuric acid by hydrolysis and melamine, ammeline and ammelide in an acidic environment. For this sewage treatment, in which the predominant component is cyanuric acid, melamine can be added to them and subsequent operations can be performed in the same way. The disadvantage of this method ow. The difficulties that arise when filtering a solution from a precipitate of the mixture of cyanurate melamine, aglmeliide and ammelin. These difficulties are caused by the fine dispersion of the precipitate, which leads to the inapplicability of fabric filters that very quickly clog the wasps; The use of granular filters with inert bulk material (for example, sand, diatomaceous earth, etc.) leads to the formation of large amounts of waste filter material contaminated with 1 minooxotriazines. This waste cannot be recycled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU782585307A SU681001A1 (en) | 1978-03-01 | 1978-03-01 | Method of the purification of waste liquors from aminooxoderivatives of s-triazine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU782585307A SU681001A1 (en) | 1978-03-01 | 1978-03-01 | Method of the purification of waste liquors from aminooxoderivatives of s-triazine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU681001A1 true SU681001A1 (en) | 1979-08-25 |
Family
ID=20751359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU782585307A SU681001A1 (en) | 1978-03-01 | 1978-03-01 | Method of the purification of waste liquors from aminooxoderivatives of s-triazine |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU681001A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4663387A (en) * | 1985-04-02 | 1987-05-05 | Kuwait Institute For Scientific Research | Utilization of melamine waste effluent |
-
1978
- 1978-03-01 SU SU782585307A patent/SU681001A1/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4663387A (en) * | 1985-04-02 | 1987-05-05 | Kuwait Institute For Scientific Research | Utilization of melamine waste effluent |
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