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  Method and apparatus for addition of aqueous solutions to high temperature processesRelated Patent Categories: Chemistry Of Hydrocarbon Compounds, Aromatic Compound Synthesis, Having Alkenyl Moiety, E.g., Styrene, Etc., By Dehydrogenation, Using Metal Oxide, Sulfide, Or SaltThe Patent Description & Claims data below is from USPTO Patent Application 20060183953. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD [0001] Embodiments of the present invention generally relate to aqueous salt addition to high temperature processes. BACKGROUND [0002] Catalytic dehydrogenation processes generally include the conversion of a paraffin alkylaromatic to the corresponding olefin in the presence of a dehydrogenation catalyst. During such dehydrogenation processes, it is desirable to maintain both high levels of conversion and high levels of selectivity. Unfortunately, dehydrogenation catalysts tend to lose activity when exposed to reaction environments, thereby reducing the level of conversion and/or the level of selectivity. Such losses may result in an undesirable loss of process efficiency. Various methods for catalyst regeneration exist, but such methods generally involve stopping the reaction process and in some cases, removing the catalyst for external regeneration, resulting in increased costs, such as costs related to heat loss and lost production. [0003] One regeneration method includes the addition of a catalyst life extender to the dehydrogenation process. Such processes may avoid/delay the need for catalyst removal from the reaction vessel for regeneration and/or disposal. Unfortunately, such processes generally have required costly implementation systems to avoid system problems, such as fouling and plugging of the process lines. [0004] Therefore, it is desirable to overcome catalyst degradation, while at the same time ensuring that such methods of overcoming the degradation do not result in costly implementation systems, fouling and/or plugging. SUMMARY [0005] Embodiments of the invention generally include a catalytic dehydrogenation system. In one embodiment, the catalytic dehydrogenation system generally includes at least one reaction vessel loaded with a dehydrogenation catalyst adapted to convert an alkyl aromatic hydrocarbon to a vinyl aromatic hydrocarbon, the reaction vessel including a vessel inlet and a vessel outlet and a first conduit operably connected to the vessel inlet and adapted to provide a feedstream thereto, the feedstream comprising the alkyl aromatic hydrocarbon. Such an embodiment further includes a supply system including a second conduit adapted to provide an aqueous catalyst life extender to the feedstream at a linear velocity sufficient to minimize fouling within the first conduit. [0006] Another embodiment includes providing a reaction vessel loaded with a dehydrogenation catalyst with a feedstream. The feedstream is provided via a conduit in operable communication with the reaction vessel, the feedstream including an alkyl aromatic hydrocarbon and the dehydrogenation catalyst adapted to convert the alkyl aromatic hydrocarbon to a vinyl aromatic hydrocarbon. Such an embodiment also includes contacting the feedstream 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. [0007] Yet another embodiment includes at least one reaction vessel loaded with a dehydrogenation catalyst, the reaction vessel including a vessel inlet and a vessel outlet adapted to pass a feedstream therethrough to contact the dehydrogenation catalyst and form a product, a first conduit operably connected to the vessel inlet and adapted to provide the feedstream thereto and a supply system, the supply system including a second conduit adapted to provide an aqueous catalyst life extender to the feedstream at a linear velocity sufficient to minimize fouling within the first conduit. BRIEF DESCRIPTION OF DRAWINGS [0008] FIG. 1 illustrates a catalytic dehydrogenation system. [0009] FIG. 2 illustrates a multistage catalytic dehydrogenation system. [0010] FIG. 3 illustrates an embodiment of a supply system. [0011] FIG. 4 illustrates an alternative embodiment of a supply system. DETAILED DESCRIPTION Introduction and Definitions [0012] A detailed description will now be provided. Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims. Each of the inventions will now be described in greater detail below, including specific embodiments, versions and examples, but the inventions are not limited to these embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the inventions, when the information in this patent is combined with available information and technology. Various terms as used herein are shown below. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing. [0013] As used herein, the term "conversion" means the percentage of paraffins or alkylaromatic hydrocarbon transformed. [0014] The term "selectivity" means percentage of alkylaromatic hydrocarbon transformed to the desired product. [0015] The term "activity" refers to the weight of product produced per weight of the catalyst used in the dehydrogenation process per hour of reaction at a standard set of conditions (e.g., grams product/gram catalyst/hr). [0016] The term " loaded" refers to introduction of a catalyst within a reaction vessel. [0017] As used herein, the term "alkali metal" includes but is not limited to, potassium, sodium, lithium and other members of the group IA and IIA metals of the periodic table, such as rubidium and cesium. In the conversion of ethylbenzene to styrene, the alkali metal is generally potassium, but depends upon the alkali metal present in the dehydrogenation catalyst. [0018] As used herein, the term "regeneration" means a process for renewing catalyst activity and/or making the catalyst reusable after it's activity has reached an unacceptable level. Examples of such regeneration may include passing steam over the catalyst bed or burning off carbon residue. Continue reading... Full patent description for Method and apparatus for addition of aqueous solutions to high temperature processes Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Method and apparatus for addition of aqueous solutions to high temperature processes patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Method and apparatus for addition of aqueous solutions to high temperature processes or other areas of interest. ### Previous Patent Application: Process for the removal of benzene from gasoline streams Next Patent Application: Process for the isomerization of an olefin Industry Class: Chemistry of hydrocarbon compounds ### FreshPatents.com Support Thank you for viewing the Method and apparatus for addition of aqueous solutions to high temperature processes patent info. IP-related news and info Results in 0.17358 seconds Other interesting Feshpatents.com categories: Novartis , Pfizer , Philips , Polaroid , Procter & Gamble , |
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