SU413705A1 - Method of simultaneous separation of cobalt and aromatic acids from still residue of dimethylterephthalate production - Google Patents
Method of simultaneous separation of cobalt and aromatic acids from still residue of dimethylterephthalate productionInfo
- Publication number
- SU413705A1 SU413705A1 SU7001601373A SU1601373A SU413705A1 SU 413705 A1 SU413705 A1 SU 413705A1 SU 7001601373 A SU7001601373 A SU 7001601373A SU 1601373 A SU1601373 A SU 1601373A SU 413705 A1 SU413705 A1 SU 413705A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- cobalt
- aromatic acids
- production
- simultaneous separation
- acids
- Prior art date
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Description
1one
Изобретение относитс к способам в|Целени кобальта из кубовых остатков производства эфиров карбоновых кислот а именно к способу одновременного выделени кобальта и ароматических кислот из кубовых остатков производства диметилтерефталата.The invention relates to methods for the treatment of cobalt from bottoms from the production of carboxylic acid esters, in particular to a method for the simultaneous separation of cobalt and aromatic acids from the bottoms from the production of dimethyl terephthalate.
Известен способ одновременного выделени кобальта и ароматических кислот из кубовых остатков производства диметилтерефталата, заключающийс в экстракции кобальта водными растворами галоидных солей металлов.There is a known method for the simultaneous separation of cobalt and aromatic acids from the bottoms of the production of dimethyl terephthalate, which consists in extracting cobalt with aqueous solutions of metal halide salts.
Характерной особенностью известного способа вл етс то, что при его осуществлении используют до 50 объемов экстрагента на объем кубовых остатков , что ведет к образованию больших количеств экстрактов с очень низкой концентрацией кобальта, значитель но осложн ющих выделение последнего. Кроме кобальта из кубовых остатков производства диметилтерефталата не выдел ютс другие ценные продукты, например а.роматические кислоты. A characteristic feature of this method is that, in its implementation, up to 50 volumes of extractant are used per volume of bottoms, which leads to the formation of large amounts of extracts with a very low concentration of cobalt, which significantly complicates the release of the latter. In addition to cobalt, no other valuable products, such as aromatic acids, are isolated from the bottoms from the production of dimethyl terephthalate.
С целью упрощени процесса кубовый остаток обрабатывают водным раствором щелочи, образовавшийс осадок отдел ют фильтрованием и извлекеоот кобальт из осадка раствором минеральнойIn order to simplify the process, the bottoms are treated with an aqueous solution of alkali, the precipitate formed is separated by filtration and the cobalt is extracted from the precipitate with a solution of mineral water.
кислоты, а из фильтрата выдел ют ароматические кислоты подкислением минеральной кислотой. Обработку кубового остатка щелочью лучше проводить- при 90-95 С. В качестве минеральной кислоты можно использовать, например серную кислоту. Извлечение кобальта из осадка лучше проводить при 95-100acids, and from the filtrate the aromatic acids are separated by acidification with mineral acid. The treatment of the bottom residue with alkali is best done at 90–95 ° C. For example, sulfuric acid can be used as a mineral acid. It is better to extract cobalt from sediment at 95-100
Применение предлагаемого способа приводит к значительному упрощению процесса и позвол ет одновременно с кобальтом выдел ть ароматические кислоты . Степень извлечени кобальта 82-89%, кислот 80-90%.The application of the proposed method leads to a significant simplification of the process and allows the release of aromatic acids simultaneously with cobalt. The degree of extraction of cobalt 82-89%, acids 80-90%.
Пример 1. Навеску кубовых остатков производства диметилтерефталата (100 г), содержащих, вес.%: диметилтерефталата 12, метиловых эфиров дифенилкарбоновых кислот 43, метиловых эфиров бензокумариндикарбоновых кислот 22 и кобальта 0,325 обрабатывают при перемешивании в течение 3 ч при 90-95°С 20%-ным водным раствором едкого натра (180 мл). Реакционную смесь охлаждают и фильтруют. При этом кобальт в виде гидроокиси остаетс в непрореагировавшей смоле (4,22 г), а fe фильтрат переход т натриевые соли ароматических кислот. Фильтрат подкисл ют серной кислотой до рН 7-8 иExample 1. A portion of the bottoms production of dimethyl terephthalate (100 g) containing, wt.%: Dimethyl terephthalate 12, methyl ethers of diphenylcarboxylic acids 43, methyl ethers of benzocoumardicarboxylic acids 22 and cobalt 0.325 are treated with stirring for 3 hours at 90-95 ° С 20 % aqueous solution of caustic soda (180 ml). The reaction mixture is cooled and filtered. In this case, the cobalt in the form of hydroxide remains in the unreacted resin (4.22 g), and the sodium salts of aromatic acids are converted to fe. The filtrate is acidified with sulfuric acid to pH 7-8 and
отфильтровывают выпавшие в осадок соединени смолообраэного типа (2,5 г), Раствор, полученный после отделени смолообразных соединений, подкисл ют Серной кислотой до полного осаждени ароматических кислот (рН 1-2) и последние отфильтровывают. Выход ароматических .кислот 85 г (85% в расчете на кубовый остаток).the precipitated compounds of the resin-like type (2.5 g) are filtered off. The solution obtained after separation of the resinous compounds is acidified with Sulfuric acid until complete precipitation of aromatic acids (pH 1-2) and the latter is filtered. The yield of aromatic. Acids 85 g (85% based on the vat residue).
Непрореагировавшую смолу (4,22 г) обрабатывают в течение 3 ч при 95-100 Unreacted resin (4.22 g) is treated for 3 hours at 95-100
Примеры выделени кобальта и ароматических кислот из кубовых остатков производства диметилтерефталатаExamples of the release of cobalt and aromatic acids from the bottoms of dimethyl terephthalate production
5%-ным раствором серной кислоты (1,1 м в пересчете на моногидрат). В результате этой обработки кобальт в виде CoS04 переходит в раствор. Полученный раствор выпаривают и вьвдел ют кристаллический (89% содержани его в кубовых остатках).5% solution of sulfuric acid (1.1 m in terms of monohydrate). As a result of this treatment, cobalt in the form of CoS04 goes into solution. The resulting solution is evaporated and crystallized (89% of its bottom residue) is added.
Другие примеры выделени кобальта и ароматических кислот по аналогичной методике приведены в таблице.Other examples of the release of cobalt and aromatic acids in a similar manner are shown in the table.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU7001601373A SU413705A1 (en) | 1970-12-22 | 1970-12-22 | Method of simultaneous separation of cobalt and aromatic acids from still residue of dimethylterephthalate production |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU7001601373A SU413705A1 (en) | 1970-12-22 | 1970-12-22 | Method of simultaneous separation of cobalt and aromatic acids from still residue of dimethylterephthalate production |
Publications (1)
Publication Number | Publication Date |
---|---|
SU413705A1 true SU413705A1 (en) | 1977-11-05 |
Family
ID=20461722
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU7001601373A SU413705A1 (en) | 1970-12-22 | 1970-12-22 | Method of simultaneous separation of cobalt and aromatic acids from still residue of dimethylterephthalate production |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU413705A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4609634A (en) * | 1980-03-31 | 1986-09-02 | American Hoechst Corporation | High efficiency extraction method for recovering oxidation catalyst material from dimethyl terephthalate esterified oxidate residue and the like |
-
1970
- 1970-12-22 SU SU7001601373A patent/SU413705A1/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4609634A (en) * | 1980-03-31 | 1986-09-02 | American Hoechst Corporation | High efficiency extraction method for recovering oxidation catalyst material from dimethyl terephthalate esterified oxidate residue and the like |
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