SU643071A3 - Method of reactivation of used silver catalyst for oxidation of ethylene to ethylene oxide - Google Patents
Method of reactivation of used silver catalyst for oxidation of ethylene to ethylene oxideInfo
- Publication number
- SU643071A3 SU643071A3 SU762352254A SU2352254A SU643071A3 SU 643071 A3 SU643071 A3 SU 643071A3 SU 762352254 A SU762352254 A SU 762352254A SU 2352254 A SU2352254 A SU 2352254A SU 643071 A3 SU643071 A3 SU 643071A3
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- catalyst
- cesium
- solution
- selectivity
- water
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
- B01J38/485—Impregnating or reimpregnating with, or deposition of metal compounds or catalytically active elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/90—Regeneration or reactivation
- B01J23/96—Regeneration or reactivation of catalysts comprising metals, oxides or hydroxides of the noble metals
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D301/00—Preparation of oxiranes
- C07D301/02—Synthesis of the oxirane ring
- C07D301/03—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds
- C07D301/04—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds with air or molecular oxygen
- C07D301/08—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds with air or molecular oxygen in the gaseous phase
- C07D301/10—Synthesis of the oxirane ring by oxidation of unsaturated compounds, or of mixtures of unsaturated and saturated compounds with air or molecular oxygen in the gaseous phase with catalysts containing silver or gold
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Catalysts (AREA)
Description
йследствие его низкой температуры кипени и низкой стоимости. Решающее значение имеет количество оды в гото вом растворе дл пропитки.Оно не долж но превышать 10% от общего количества раствора. Лреимущественно концентраци воды составл ет 0,2 - 5 вес.%, в особенности в том случае, когда примен ют нитрат цези или нитрат рубиди Концентрации соединени цези , соответст венно рубиди в растворе дл пропитки ограничиваетс раство эимостью соедине ни . Однако в большинстве случаев целесообразно, чтобы минимальна концентраци составл ла 0,01 вес.%. Особенно целесообразной оказываетс концентраци 0,05-0,4 вес.% в расчете на общее количество раствора. Обработка отработанного катализатора соответствующим изобретению раствором дл пропитки .наиболее просто может быть осуществлена йосредством пропитии отработанного катализ.атора и слива избыточного количества . раствора. В больших установках обработку пройз&ода:т посредством заливки реактора, заполненного катализатором, раствором соединени цези или рубиди . ПослеОтделени избыточного раствора оставшийс на катализаторе, спирт и в некоторых случа х воду удал ют , посредством упаривани и, если .желательно, при дополнительной проду )экё; азота. Температура при упаривании не. должна быть слишком вь1сока по сравнению с температурой кийени примененного спирта.Если отгонку производ т при пониженном лавл1энии,то в зависимости от спирта упаривание может быть осуществлено уже при комнатной температуре или, например, при 50 с. Но часто целесообразно выбирать более высокую температуру, например 50 - .due to its low boiling point and low cost. The amount of ode in the prepared impregnation solution is crucial. It should not exceed 10% of the total amount of the solution. Advantageously, the water concentration is between 0.2 and 5% by weight, especially when cesium nitrate or rubidium nitrate is used. The concentrations of the cesium compound, respectively, rubidium in the impregnation solution are limited by the solubility of the compound. However, in most cases it is advisable that the minimum concentration be 0.01 wt.%. A concentration of 0.05-0.4% by weight, calculated on the total amount of the solution, is particularly suitable. The treatment of the spent catalyst by the relevant invention with the impregnation solution can most easily be carried out by soaking the spent catalyst and draining the excess amount. solution. In large installations, the treatment is propez & o: t by pouring a reactor filled with a catalyst with a solution of a cesium or rubidium compound. After the separation of the excess solution, the alcohol remaining on the catalyst, and in some cases water, is removed by evaporation and, if desired, with additional product; nitrogen. Evaporation temperature is not. should be too high compared with the temperature of the applied alcohol. If distillation is carried out under reduced pressure, then evaporation can be carried out already at room temperature or, for example, at 50 s. But it is often advisable to choose a higher temperature, for example 50 -.
Окислени этилена в окись зтилена В особенно предпочтительном варианте осуществлени изобретени отработанный катализатор пропитывают импрегнирующим раствором, состо щим из 0,2. 5 вес.% воды, 0,05-0,4 вес.% нитрата цези или рубиди и алифатического спирта, содержащего 1-6 атомов углерода , и непосредственно после этого спирт упаривают при 70 - 120с, предпочтительно при ЗО-ИО-с, в некоторых случа х при одновременном продувании азота. При этом целесообразно нитрат цези , соответственно, нитрат рубиди , раствор ть в минимальном количестве воды, необходимом дл полного растворени , а затем производить разбавление таким количеством метилового, этил ловрго, пропилового или изопропилового спирта, предпочтительно метилового, спирта, чтобы концентраци воды в готовом растворе .дл пройиткн составл ла 0,2 - 5 вес.%, Концентраци нитрата рубиди или нитрата цези составл ет 0,05 - 0,4 вес.% в расчете на общее количество раствора. Как всегда, так и здесь Необходима концентраци рубиди или цези на катализаторе составл ет 1.- 1000, предпочтительно 3 - 500 млн , в. особенности 10.300 млн-i, причем она можетдостигатьс посредством применени раствора ЙЛ пропитки соответствующей концентрации . . - . . . . . Свойства катализатора до и после обработки приведены в таблице. Как видно из .таблицы, благодар соответствующей изобретению обработке отработанного катализатора с пониженной активностью его селективносты значительно повышаетс . Кроме того, степень превращени увеличиваетс в 2-4 раза или при равной степени превращени может быть понижена реакционна температура на 20-30 С.Oxidation of Ethylene in Oxyethylene In a particularly preferred embodiment of the invention, the spent catalyst is impregnated with an impregnating solution consisting of 0.2. 5% by weight of water, 0.05-0.4% by weight of cesium or rubidium nitrate and aliphatic alcohol containing 1-6 carbon atoms, and immediately thereafter the alcohol is evaporated at 70-120 seconds, preferably at 30-300, in some cases while blowing nitrogen. It is advisable that cesium nitrate, respectively, rubidium nitrate, be dissolved in the minimum amount of water necessary for complete dissolution, and then diluted with such amount of methyl, ethyl, propyl or isopropyl alcohol, preferably methyl alcohol, so that the concentration of water in the finished solution The flow rate was 0.2 - 5% by weight. The concentration of rubidium nitrate or cesium nitrate is 0.05 - 0.4% by weight, calculated on the total amount of solution. Both always and here. The necessary concentration of rubidium or cesium on the catalyst is 1.-1000, preferably 3-500 ppm. features 10.300 ppm-i, and it can be achieved by applying a solution of YLL impregnation of the appropriate concentration. . -. . . . . The properties of the catalyst before and after treatment are shown in the table. As can be seen from the table, thanks to the treatment of the spent catalyst with reduced activity according to the invention, its selectivity is greatly increased. In addition, the degree of conversion increases by 2-4 times, or with an equal degree of conversion, the reaction temperature can be lowered by 20-30 ° C.
До обработки После обработкиBefore processing After processing
Возможность понижени реакционной температуры представл ет собой другое преимущество предлагаемого способе 60 так как с понижением температуры умень пгаетс образование нежелательных побочных продуктов, например двуокиси углерода, формальдегида и уксусного альдегида.The possibility of lowering the reaction temperature is another advantage of the proposed method 60 since the formation of undesirable by-products, such as carbon dioxide, formaldehyde and acetic aldehyde, decreases with decreasing temperature.
70 70
4-5 78 10-124-5 78 10-12
4-54-5
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19752519599 DE2519599C2 (en) | 1975-05-02 | 1975-05-02 | PROCEDURE FOR REACTIVATING USED SILVER SUPPORT CATALYSTS |
Publications (1)
Publication Number | Publication Date |
---|---|
SU643071A3 true SU643071A3 (en) | 1979-01-15 |
Family
ID=5945588
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU762352254A SU643071A3 (en) | 1975-05-02 | 1976-04-30 | Method of reactivation of used silver catalyst for oxidation of ethylene to ethylene oxide |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE841408A (en) |
DE (1) | DE2519599C2 (en) |
SU (1) | SU643071A3 (en) |
ZA (1) | ZA762463B (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1569974A (en) * | 1976-03-05 | 1980-06-25 | Ici Ltd | Restoration of selectivity to catalysts used in the production of olefine oxides |
GB1575810A (en) | 1976-10-21 | 1980-10-01 | Shell Int Research | Process for the performance of silver catalysts |
DE2649359C3 (en) * | 1976-10-29 | 1979-07-26 | Hoechst Ag, 6000 Frankfurt | Process for improving the effectiveness of used supported silver catalysts |
EP0002045B1 (en) | 1977-11-19 | 1981-09-02 | BASF Aktiengesellschaft | Process for preparing an ethylene oxide catalyst |
DE2940480A1 (en) * | 1978-10-05 | 1980-04-17 | Mitsui Toatsu Chemicals | Reactivating silver catalysts used for ethylene oxide prodn. - by deposition of alkaline earth and opt. alkali metal |
DE2904919A1 (en) * | 1979-02-09 | 1980-08-21 | Basf Ag | METHOD FOR THE PRODUCTION AND REGENERATION OF CARRIER CATALYSTS AND THE USE THEREOF FOR THE PRODUCTION OF AETHYLENE OXIDE |
DE2916887C2 (en) * | 1979-04-26 | 1981-12-17 | Chemische Werke Hüls AG, 4370 Marl | Process for activating or reactivating silver-supported catalysts |
DE2936036A1 (en) * | 1979-09-06 | 1981-04-02 | EC Erdölchemie GmbH, 5000 Köln | METHOD FOR PRODUCING ETHYLENE OXIDE |
US8871959B2 (en) | 2008-10-08 | 2014-10-28 | Basf Se | Method for producing an alkylene oxide |
-
1975
- 1975-05-02 DE DE19752519599 patent/DE2519599C2/en not_active Expired
-
1976
- 1976-04-26 ZA ZA762463A patent/ZA762463B/en unknown
- 1976-04-30 SU SU762352254A patent/SU643071A3/en active
- 1976-05-03 BE BE166685A patent/BE841408A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ZA762463B (en) | 1977-04-27 |
DE2519599B1 (en) | 1976-07-01 |
BE841408A (en) | 1976-11-03 |
DE2519599C2 (en) | 1977-02-17 |
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