A process for the production of an olefin oxide, a 1,2-diol, a 1,2-diol ether, a 1,2-carbonate, or an alkanolamine
A technology of epoxidation and carbon dioxide, applied in the field of alkylene oxide
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[0027] The preparation of silver catalysts is known in the art, and catalysts useful in the practice of this invention can be prepared using known methods. The method of depositing silver on a support includes impregnating the support or support body with a silver compound containing cationic silver and / or complex silver, and reducing to form metallic silver particles. A further description of these methods can be found in US-A-5380697, US-A-5739075, US-A-4766105 and US-B-6368998, which are incorporated herein by reference. Suitably, silver dispersions such as silver sols may be used to deposit silver on the support.
[0028]The reduction of cationic silver to metallic silver can be accomplished in the step of drying the catalyst, so that the reduction itself no longer requires a separate process step. This may be the case if the silver-containing impregnation solution contains reducing agents such as oxalate, lactate or formaldehyde.
[0029] Appreciable catalytic activity ...
Embodiment 1
[0068] The preparation of embodiment 1-raw material silver solution:
[0069] This example describes the preparation of the raw silver impregnation solution used to prepare Catalyst A in Example 2.
[0070] Silver-amine-oxalate stock solution was prepared according to the following procedure:
[0071] In a 5 liter stainless steel beaker, dissolve 415 g of reagent grade sodium hydroxide in 2340 ml of deionized water, and adjust the temperature to 50°C.
[0072] In a 4 liter stainless steel beaker, dissolve 1699 g of high purity "Spectropure" silver nitrate in 2100 ml of deionized water, and adjust the temperature to 50°C.
[0073] The sodium hydroxide solution was slowly added to the silver nitrate solution under stirring conditions, while maintaining the solution temperature at 50°C. The mixture was stirred for 15 minutes. The pH of the solution was maintained above 10 by adding sodium hydroxide solution as needed.
[0074] Water was removed from the sediment resulting fro...
Embodiment 2
[0076] The preparation of embodiment 2-catalyst:
[0077] Catalyst A:
[0078] Catalyst A was prepared as follows:
[0079] Add 0.1779g ammonium perrhenate dissolved in 2g 1:1 ammonia / water, 0.0491g ammonium metatungstate dissolved in 2g 1:1 ammonia / water in 204 grams of raw material silver solution of 1.558g / ml specific gravity, 0.1273g lithium sulfate monohydrate dissolved in 2g water, and 0.2087g lithium hydroxide monohydrate dissolved in 2g water, 0.067g potassium nitrate dissolved in 2g water. More water was added to adjust the specific gravity of the solution to 1.504 g / ml. 50 g of the resulting solution was mixed with 0.1071 g of a 50 wt% cesium hydroxide solution to produce the final impregnation solution. The container containing 30 grams of Carrier A hollow cylinders (see Table I below) was evacuated to 20 mmHg for 1 minute and the final impregnation solution was added to Carrier A under vacuum, the vacuum was then released, and the carrier was brought into contact ...
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