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High Concentration Silver Solution for Ethylene Oxide Catalyst Preparation

A silver solution and concentration technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problems of reducing catalyst productivity and complex methods

Active Publication Date: 2018-03-30
SCI DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the double impregnation method generally reduces catalyst productivity and complicates the process when incorporating promoting substances

Method used

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  • High Concentration Silver Solution for Ethylene Oxide Catalyst Preparation
  • High Concentration Silver Solution for Ethylene Oxide Catalyst Preparation
  • High Concentration Silver Solution for Ethylene Oxide Catalyst Preparation

Examples

Experimental program
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preparation example Construction

[0049] In the production of ethylene oxide, the reactant feed mixture typically comprises from about 0.5 to about 45% ethylene and from about 3 to about 15% oxygen, with the balance comprising relatively inert materials such as Nitrogen, carbon dioxide, methane, ethane, argon, and the like. Typically only a portion of the ethylene reacts with each pass over the catalyst. Unreacted materials are typically returned to the oxidation reactor after separation of the desired ethylene oxide product and removal of appropriate purge gas streams and carbon dioxide to prevent uncontrolled accumulation of inert products and / or by-products. For illustration only, the following conditions can be applied in a conventional commercial ethylene oxide reactor unit: Gas Hourly Space Velocity (GHSV) 1500-10,000h -1 , reactor inlet pressure 150-400 psig, coolant temperature 180-315° C., oxygen conversion level 10-60%, and EO production (working rate) of 100-300 kg EO per cubic meter of catalyst pe...

Embodiment 1

[0073] Has a surface area of ​​0.67m 2 / g and a water absorption of 43.8cc / 100g, the support was washed with 0.025N NaOH solution and then rinsed with complete DI water. The carrier was dried at 150°C for use.

[0074] 1500 g of the silver solution was prepared using the following components, with a target silver content of 35% in the solution. Ammonium oxalate was the only source of anions (ie, mole fraction 1).

[0075] Silver oxide: 563.9g

[0076] Water: 297.8g

[0077] Ethylenediamine: 292.5g

[0078] Ammonium oxalate: 345.8g

[0079] Solution preparation:

[0080] In a container placed in an ice bath to control the temperature of the solution at 20°C to 30°C, water was gradually mixed with ethylenediamine under vigorous stirring. Ammonium oxalate was then added to the solution while maintaining the temperature at 20°C to 30°C. After the ammonium oxalate was completely dissolved, silver oxide was added to the solution at a temperature between 20°C and 30°C. Once ...

Embodiment 2

[0091] Example 1 was repeated except that ammonium bicarbonate was used and the weight of starting material used. Ammonium bicarbonate was the only source of anions (ie, mole fraction 1). 1500 g of the silver solution was prepared using the following components, with a target silver content of 36% in the solution:

[0092] Silver oxide: 580.0g

[0093] Water: 223.3g

[0094] Ethylenediamine: 300.9g

[0095] Ammonium bicarbonate: 395.8g

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Abstract

A silver impregnation solution comprising: (i) silver ions, (ii) a silver concentration enhancer selected from at least one ammonium salt having a thermally decomposable anionic component, or at least one amino acid or a combination thereof, (iii ) at least one organic amine, and (iv) water; wherein said components (i)-(iii) are dissolved in said impregnation solution, and may or may not contain oxalic acid. The silver impregnation solutions can achieve significantly higher silver concentrations, including at least or greater than 33 wt%, 34 wt%, or 35 wt%. A method for the preparation of silver catalysts by silver impregnation of a refractory support followed by calcination is also described. The resulting silver catalyst has a high silver loading, typically at least 17 wt%, 18 wt% or 19 wt%.

Description

[0001] Cross References to Related Applications [0002] This disclosure claims the benefit of US Provisional Application Serial No. 61 / 918342, filed December 19, 2013, the entire contents of which are incorporated herein by reference. technical field [0003] The present disclosure relates to silver-based ethylene oxide catalysts for the oxidative conversion of ethylene to ethylene oxide, and in particular to their preparation. More specifically, the present disclosure relates to silver impregnation solutions with high silver concentrations, and their use in the preparation of silver-based ethylene oxide catalysts with high activity and selectivity. Background technique [0004] It is generally known that high silver loadings in ethylene oxide catalysts lead to increased selectivity, activity and stability. For these reasons, high silver loadings are generally desired. One method known in the art to increase silver loading in catalysts is to use superabsorbent supports. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J37/02B01J37/08
CPCB01J37/06B01J23/50B01J37/0203B01J37/0207B01J37/0213B01J31/0238B01J31/0239B01J31/04B01J2231/72B01J23/688B01J35/612B01J21/04B01J23/04B01J27/055B01J37/02B01J37/08B01J31/00
Inventor 曹立新安杰伊·罗基奇
Owner SCI DESIGN