Method of controlling the production of silver chloride on a silver catalyst in the production of alkylene oxides
A technology of silver catalyst and silver chloride, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of activity reduction
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0097] 80 cc of a silver-based high efficiency rhenium-promoted ethylene oxide catalyst was charged into the autoclave reactor. Upstream of the reactor, the ethylene feed is passed through a first bed of Actisorb 301 at ambient temperature and a pressure of about 295 psig (2030 kPa-gauge), followed by contacting SG second bed for desulfurization. The flow rate of ethylene to the bed is about 500-550scfh (14.1-15.6 standard m 3 / hour) changes. Each bed was made from four-inch (10-cm) ID tubing approximately 48 inches (1.2 m) in length. The first bed contained 23.0 lbs. (10.4 kg) of Actisorb 301 and the second bed contained 17.0 lbs. (7.71 kg) of Selexsorb SG. Examples 2-5 were carried out using this same desulfurization system.
[0098] Based on the amount of sulfate found on the catalyst exiting Examples 1-5 (shown in Table 1 below), and the estimated percentage of feed gas sulfur adsorbed on the catalyst, it is estimated that in the first and second beds After desulfuri...
Embodiment 2
[0101] 80 cc of the same batch of ethylene oxide catalyst as in Example 1 was charged into the autoclave reactor and started in the same manner as in Example 1 . After about 6 days, the operating conditions were changed to the same conditions as in Example 1 which favored the formation of AgCl. In this case, however, no hydrogen sulfide was added to the reactor feed. The reactor was run for approximately another 19 days and shut down. Catalyst was removed and analyzed. No AgCl was detected on the catalyst when analyzed by X-ray fluorescence and X-ray diffraction.
Embodiment 3
[0103]80 cc of the same batch of ethylene oxide catalyst as used in Example 1 was charged into the autoclave reactor. The reactor was operated under the conditions given in Example 1 which favored the formation of AgCl. At about the same time, a small amount of hydrogen sulfide feed was started to the reactor, which equated to about 0.025 ppmv (25 ppbv) of hydrogen sulfide based on the reactor feed flow. The reactor was run at these conditions for about 22 days and shut down. The catalyst was removed from the reactor and analyzed. The discharged catalyst contained about 2.7% by weight AgCl. This example shows that catalyst activation time has a significant effect on silver chloride formation when certain concentrations of sulfur-containing compounds are present in the alkylene oxide reactor feed.
PUM
| Property | Measurement | Unit |
|---|---|---|
| specific surface area | aaaaa | aaaaa |
| specific surface area | aaaaa | aaaaa |
| diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More