Catalyst for alkane dehydrogenation and device

Abstract

The invention provides a catalyst for alkane dehydrogenation as well as a continuous reaction regeneration device and method using the catalyst for catalytic dehydrogenation. The catalyst comprises four ingredients, the ingredient A is oxides of one kind of element or several kinds of elements from Ti, Nb, Ta, Mo, W, Re, In or Ga, the ingredient B is one kind or several kinds of materials in MgO, P2O5, ZrO2, Al2O3 or SiO2, the ingredient C is oxides of one kind of material or several kinds of materials from Zn, Cd and Sn, and the ingredient D is one kind of material or a mixture of several kinds of materials from alkali oxides or alkaline earth metal oxides. The catalyst does not contain noble metal such as Pt and the like, does not contain toxic ingredients such as Cr and the like and cannot pollute the environment. The activity of the catalyst is high, the selectivity of olefin generated by alkane dehydrogenation is high, the stability of the catalyst is good, the mechanical intensity is high, the continuous reaction regeneration device is used for alkane dehydrogenation, the reaction and the catalyst regeneration are continuously carried out, the efficiency is high, and the safety is high.

Description

technical field [0001] The invention relates to an alkane dehydrogenation catalyst, in particular to a low-carbon alkane dehydrogenation catalyst, a preparation method of the catalyst and a device for catalytic alkane dehydrogenation using the modified catalyst. Background technique [0002] Olefins and diolefins (ethylene, propylene, butene, isobutylene, isoprene and butadiene, etc.) in synthetic resins, plastics, high-octane gasoline blending components (methyl tert-butyl ether, methyl tert-amyl Ethers and alkylated oils) and other high value-added products are widely used. In addition to these olefins, steam cracking of hydrocarbons (such as steam cracking of ethane, steam cracking of naphtha), catalytic cracking of olefins (such as Superflex technology), catalytic cracking of heavy oil (such as TMP, DCC technology) and catalytic pyrolysis of heavy oil (such as CPP technology) and other processes, the catalytic dehydrogenation of alkanes is also an important technical ro...

AI Technical Summary

Problems solved by technology

Whether it is a Cr-based catalyst or a Pt-based catalyst, it will be deactivated by coking within a few hours of continuous feeding, so the catalyst must be frequently regenerated

Moreover, Pt is expensive, and the high investment and catalyst use costs limit the application of the dehydrogenation process using Pt catalysts. Only countries or regions with abundant isobutane resources and low prices can the economics of this process be reasonable.

In addition, the use of Pt catalysts must also deoxygenate the circulating gas, because the catalysts are very sensitive to oxygen, including molecular oxygen, methanol, MTBE, dimethyl ether, and oxygen in water; for Cr catalysts, the dehydrogenation of supported Cr catalysts The performance has reached a nearly perfect level. For example, the conversion rate of the Catofin process is close to the limit of thermodynamic equilibrium, and the selectivity of olefins is still above 95%. However, the environmental problems caused by the leakage of hexavalent Cr cannot be underestimated.

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