SU952746A1 - Method for regenerating washing liquors based on trilon b - Google Patents
Method for regenerating washing liquors based on trilon b Download PDFInfo
- Publication number
- SU952746A1 SU952746A1 SU813240394A SU3240394A SU952746A1 SU 952746 A1 SU952746 A1 SU 952746A1 SU 813240394 A SU813240394 A SU 813240394A SU 3240394 A SU3240394 A SU 3240394A SU 952746 A1 SU952746 A1 SU 952746A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- trilon
- washing liquors
- regenerating washing
- solutions
- liquors based
- Prior art date
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Description
Изобретение о.тноситс к обработке промышленных сточных вод, в частности к способам регенерации этилендиаминтетрауксусной кислоты (ЭДТД) или ее солей.The invention relates to the treatment of industrial wastewater, in particular to methods for the recovery of ethylenediaminetetraacetic acid (EDTD) or its salts.
Известен способ регенерации ЭДТА путем высаживани гидроокиси железа из промывных растворов оборудовани без упаривани растворов ijA known method for the regeneration of EDTA by precipitating iron hydroxide from the washing solutions of equipment without evaporation of solutions ij
Однако такой способ примен етс дл концентрированных растворов и требует посто нного добавлени ЭДТА до необходимой концентрации.However, this method is used for concentrated solutions and requires constant addition of EDTA to the required concentration.
Наиболее близким к изобретению по .технической сущности и достигаемому результату вл етс способ регенерации промывных растворов на осно- ве трилона Б, при котором раствор сначала упаривают в кислой среде (рН 4,0-4,5), а затем обрабатывают концентрированной натриевой щелочью при величине рН 11,0-12,0 с целью разрушени комплекса железа с трилоном Б и высаживани гидроокиси железа с последующим отделением осадка 2 .The closest to the invention in terms of its technical essence and the achieved result is a method of regeneration of washing solutions based on Trilon B, in which the solution is first evaporated in an acidic medium (pH 4.0-4.5), and then treated with concentrated sodium alkali at pH 11.0-12.0 to destroy the complex of iron with Trilon B and precipitate iron hydroxide, followed by separation of the precipitate 2.
Однако известный способ требует дорогосто щего нержавеющего оборудовани . Кроме того, необходим дополнительный расход минеральной кислоты дл выделени ЭДТА в чистом виде при величине рН 1-2. Поэтому в сбросных растворах нар ду с неизвле5 ченными количествами ЭДТА содержатс ионы Cl или , при сбросе этих растворов в открытые водоемы наноситс ущерб окружающей среде. Во избежание этого в технологическую схему должны быть включены дополнитель10 ные операции по обезвреживанию ионов С1 или S04 . К тому же дл приготовлени из ЭДТА свежего раствора дл промывки должно быть предусмотрено дополнительное оборудование: баки с However, the known method requires expensive stainless equipment. In addition, additional consumption of mineral acid is necessary for the release of EDTA in its pure form with a pH value of 1-2. Therefore, along with intact amounts of EDTA, Cl ions are contained in the waste solutions, or when these solutions are discharged into open water bodies, environmental damage is caused. In order to avoid this, additional procedures for the neutralization of C1 or S04 ions should be included in the technological scheme. In addition, for the preparation of a fresh washing solution from EDTA, additional equipment must be provided: tanks with
15 мешалками, дозаторы, насосы и т.д.15 agitators, dispensers, pumps, etc.
Это делает практическое использование известного способа дорогим и громоздким в аппаратурном оформлении.This makes the practical use of the known method expensive and cumbersome in hardware design.
Целью изобретени вл етс упроще20 ние процесса.The aim of the invention is to simplify the process.
Поставленна цель достигаетс тем, что согласно способу регенерации промывных растворов на основе трилона Б, включающему упаривание, обработку ще25 лочью с отделением гидроокиси железа, упаривание производ т после отделени гидроокиси железа.This goal is achieved in that according to the method of regeneration of washing solutions based on Trilon B, including evaporation, treatment with alkali with separation of iron hydroxide, evaporation is performed after separation of iron hydroxide.
Пример. Провод т лабораторные исследовани регенерации разбавленных промывных растворов на основеExample. Laboratory studies of the regeneration of diluted wash solutions based on
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU813240394A SU952746A1 (en) | 1981-01-29 | 1981-01-29 | Method for regenerating washing liquors based on trilon b |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU813240394A SU952746A1 (en) | 1981-01-29 | 1981-01-29 | Method for regenerating washing liquors based on trilon b |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU952746A1 true SU952746A1 (en) | 1982-08-23 |
Family
ID=20940297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU813240394A SU952746A1 (en) | 1981-01-29 | 1981-01-29 | Method for regenerating washing liquors based on trilon b |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU952746A1 (en) |
-
1981
- 1981-01-29 SU SU813240394A patent/SU952746A1/en active
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