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Deoxidation catalyst, preparation method
 
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upamfva



Anmeldungsdatum: 12.04.2022
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BeitragVerfasst am: 26. Apr 2022 05:04    Titel: Deoxidation catalyst, preparation method Antworten mit Zitat

Deoxidation catalyst, preparation method



The invention discloses a deoxidation catalyst and a preparation method and application thereof. The catalyst of the invention takes CuO and MnO2 as main catalytic active components, while metal oxides such as Zn, Ni and Au can be included and takes Al2O3 as adhesive. The deoxidization catalyst is prepared by a coprecipitation method, namely, a composite oxide of active component firstly prepared by the coprecipitation method is kneaded, molded, dried and baked with solid peptizator, liquid peptizator and pore-expanding agent. The deoxidization catalyst of the invention is applicable to a deoxidization process of high oxygen content gas mixture, especially to a deoxidation process of preparing epoxy propylene oxide tail gas by chlorohydrination. The deoxidization catalyst of the invention has the advantages of high activity and good selectivity, especially excellent activity stability, large amount of gas processing, conveniently preparation and low cost, etc.Get more news about Oxide Deoxidizing Catalyst,you can vist our website!
Oxygen is one of main composition component of atmosphere, so often contains the oxygen of different content in some raw materials technology gases.In addition, need to introduce oxygen in some technologies, therefore, often contain a certain amount of oxygen in the discharging gas.In some operating modes, process feed gas need be with oxygen removal before using; In some operating modes, technology discharging gas is further also needing oxygen removal before processing or the utilization.
The deoxidation process of gaseous mixture mainly comprises physical method and chemical method, physical method such as absorption method, chemical method such as firing method, catalytic reduction method etc.Wherein catalytic reduction method mainly is in the presence of catalyst, utilizes the reaction of reducing agent and oxygen, with oxygen removal.In the prior art, catalytic reduction method is mainly used in removing of micro amount of oxygen in the gas, adopts noble metal catalyst, is reducing agent with hydrogen, and hydrogen and oxygen are converted into water and with oxygen removal.As CN1175478A a kind of dehydrogenation catalyst is disclosed, with TiO 2Be main carrier, active component is precious metal palladium and/or platinum, and bullion content is 0.01~5%, is mainly used in removing of micro amount of oxygen in the gases such as hydrogen, nitrogen.CN1110249A discloses a kind of desoxydation dehydrogenation catalyst, is active component with Ni, Mn element, and alkali earth metal is as auxiliary agent, Al 2O 3Be carrier, also be mainly used in removing of micro amount of oxygen in the nitrogen etc.CN1130542A discloses a kind of deoxidation method for inert gas, the consisting of of the catalyst of employing: CuO 25-50, ZnO 20-40, Cr 2O 310-30, graphite 3-8, this method also only can be applicable to the inert gas deoxidation of oxygen content≤5%.
In some technology gaseous mixtures or process feed gas, often contain the oxygen of high level, can reach more than 10% as oxygen volume content in the mists such as tail gas of coal mine mash gas, propylene oxide by chlorohydrination (PO) production technology.The method that removes high level oxygen in the mist at present is mainly firing method and pressure swing adsorption method.The main deficiency of these methods is that the scope of application is narrower, and is bigger to the influence of the recovery component of gaseous mixture, and the flow process complexity, has certain potential safety hazard.
Expoxy propane (PO) is one of important chemical material, and in propane derivative, expoxy propane is the third-largest derivative that is only second to polypropylene and acrylonitrile, is mainly used in to produce polyurethane, unsaturated-resin and surfactant etc.In May, 2004, world's production of propylene oxide ability of statistics reached 6,800,000 t/a, will reach 7,230,000 t/a to 2006 annual capacities.Because the pulling of polyurethane and unsaturated polyester (UP) high-speed requirement increases fast to the expoxy propane demand.
The industrial technology that epoxidation of propylene is produced PO has two kinds now: a kind of is chlorohydrination, and another kind is a conjugated oxidation.Two kinds of production technologies device capability in the world is suitable, and two kinds of technologies all have its advantage and deficiency separately, and chlorohydrination and conjugated oxidation can and be deposited in quite long period.In the chlorohydrination production technology, discharging tail gas contains a large amount of propylene and propane etc., has suitable value.But because oxygen content is very high in the tail gas, the concentration of propylene, propane causes it to separate in industry and reclaims very difficulty near explosion limit, and enterprise all burns it at present.This not only severe contamination environment, and greatly wasted resource, reduced the benefit of enterprise.
Epoxidation of propylene is produced PO discharging tail gas oxygen content height, the component complexity, the chemism height of some components (as propylene etc.), prior art can't be effectively with oxygen removal wherein, and effectively reclaim valency matter height, character active components such as propylene.
wrex



Anmeldungsdatum: 29.03.2023
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BeitragVerfasst am: 05. Jan 2024 00:15    Titel: value Antworten mit Zitat

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