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Method and apparatus for addition of aqueous solutions to high temperature processes

A catalytic dehydrogenation and conduit technology, applied in the field of aqueous solutions, can solve problems such as high system operating costs, catalyst degradation, and high costs

Inactive Publication Date: 2008-02-13
FINA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, this approach often requires costly operating systems to avoid system problems such as line fouling and clogging
[0004] Therefore, there is a need to address catalyst degradation while ensuring that the solution to the degradation does not cause high system operating costs, fouling and / or clogging issues

Method used

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  • Method and apparatus for addition of aqueous solutions to high temperature processes
  • Method and apparatus for addition of aqueous solutions to high temperature processes
  • Method and apparatus for addition of aqueous solutions to high temperature processes

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Through the system shown in Figure 4 (in which the second conduit has a diameter of 1 inch), steam and an ethylbenzene feed stream are contacted in a reaction with a potassium-promoted iron oxide dehydrogenation catalyst to form styrene. A feed stream (10:1 steam:ethylbenzene molar ratio) at about 1200 F (649 C) was introduced into the reaction at a rate of about 20 ft / s through a first conduit (54 inches in diameter). Before the inlet of the reaction vessel, an aqueous solution of potassium acetate is injected into the first conduit to contact and mix with the feed stream. Potassium acetate was at ambient temperature prior to injection.

[0062] After 2 months, a gamma scan of the first catheter revealed deposits near the junction of the first and second catheters.

Embodiment 2

[0064]Through a system as shown in Figure 4 (in which the second conduit has a diameter of 1 / 4 inch), steam and an ethylbenzene feed stream are contacted in a reaction with a potassium-promoted dehydrogenation catalyst to form styrene. A feed stream (10:1 steam:ethylbenzene molar ratio) at about 1200°F (649°C) was introduced into the reaction at a rate of about 20 ft / s through a first conduit (54 inch diameter). Before the inlet of the reaction vessel, an aqueous solution of potassium acetate is injected into the first conduit to contact and mix with the feed stream. Potassium acetate was at ambient temperature prior to injection.

[0065] Two months after the start of the above process, a gamma scan was performed on the conduit and reaction vessel, and it was observed that there was substantially no deposition therein.

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Abstract

Methods and systems for extending the life of a dehydrogenation catalyst are described herein. For example, one embodiment includes providing a reaction vessel loaded with a dehydrogenation catalyst with a feedstream via a conduit in operable communication with the reaction vessel. The feedstream may include an alkyl aromatic hydrocarbon and the dehydrogenation catalyst may be adapted to convert the alkyl aromatic hydrocarbon to a vinyl aromatic hydrocarbon. The feedstream may be contacted with an aqueous catalyst life extender, wherein the aqueous catalyst life extender enters the conduit at a linear velocity sufficient to prevent vaporization of the catalyst life extender in the conduit prior to contact with the feedstream.

Description

field of invention [0001] The present invention generally relates to how to add aqueous salt solutions in high temperature processes. Background technique [0002] Catalytic dehydrogenation processes generally involve the conversion of paraffinic alkylaromatics to the corresponding olefins in the presence of a dehydrogenation catalyst. In this dehydrogenation process, it is required to maintain high conversion and high selectivity simultaneously. Unfortunately, dehydrogenation catalysts become deactivated when exposed to the reaction environment, thereby reducing conversion and / or selectivity. Such losses may result in an undesired loss of industrial efficiency. There are many methods for catalyst regeneration, but these methods generally involve stopping the reaction process and, in some cases, removing the catalyst for external regeneration, resulting in increased costs, such as those related to heat loss and shutdown. [0003] One regeneration method involves adding ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/64B01J8/02
CPCB01J19/002C07C2523/04C07C5/324B01J23/78C07C5/3335B01J8/02B01J8/06C07C2523/745B01J8/18B01J2208/00707B01J2219/0004B01J8/04Y02P20/52C07C15/44C07C11/06C07C11/167C07C15/46C07C2/54C07C2/64
Inventor M·杜勒C·佩尔西克A·拉巴拉斯J·巴特勒J·梅里尔
Owner FINA TECH