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Denitration method for cracked flue gas produced in production of low-carbon olefin through steam cracking

A technology for cracking flue gas and low-carbon olefins, applied in separation methods, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as ammonia leakage, complex system, and large investment, and achieve Saving resources, good denitrification effect, and cost reduction effect

Active Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing flue gas treatment technologies such as NH 3 -SCR technology is mainly used in flue gas treatment of thermal power plants, but NH 3 -SCR technology requires large investment, complex system, and may produce secondary pollution such as ammonia leakage

Method used

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  • Denitration method for cracked flue gas produced in production of low-carbon olefin through steam cracking
  • Denitration method for cracked flue gas produced in production of low-carbon olefin through steam cracking

Examples

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preparation example Construction

[0029] The supported Pd-Pt series catalyst can be commercially available, and can also be prepared by conventional methods in the art. Preferably, the preparation method of the supported Pd-Pt series catalyst comprises:

[0030] (a-1) Coating the slurry of pseudo-boehmite on honeycomb cordierite (honeycomb cordierite ceramics can be used), drying and firing to obtain honeycomb cordierite with aluminum-containing coating, and as a carrier;

[0031] (b-1) Coating a solution containing a palladium compound and a platinum compound on the above carrier, drying and calcining to prepare a supported Pd-Pt catalyst.

[0032] Wherein, the palladium-containing compound may be, for example, one or more of palladium nitrate, palladium chloride, sodium tetrachloropalladate and palladium acetylacetonate. The platinum-containing compound may be, for example, one or more of chloroplatinic acid, potassium tetrachloroplatinate and potassium hexachloroplatinate. The solvent of the solution used...

preparation example 1

[0056] This preparation example is used to illustrate the supported Pd-Pt catalyst used in the present invention.

[0057] (a) 100g of pseudo-boehmite powder (purchased from Zibo Taiguang Chemical Co., Ltd. GL-1 brand) and 400g of water were ball milled at a speed of 50rpm in a ball mill (Nanjing Laibu Technology Industrial Co., Ltd. QM model) for 2h to obtain Suspended slurry, the slurry was coated on 1000g honeycomb cordierite ceramics (purchased from Jiangxi Xingfeng Chemical Packing Co. extruded in a bar machine, and then calcined at 700°C for 6h to obtain a γ-Al 2 o 3 Coated honeycomb cordierite support.

[0058] (b) immersing the carrier obtained in step (a) in an aqueous solution containing 1% by weight of chloroplatinic acid and 1% by weight of palladium chloride for 12h, then drying at 120°C for 4h, and then calcining at 500°C for 4h, Thereby making Pd / Pt-Al 2 o 3Catalyst C1, based on the total amount of the catalyst, the content of Pd element is 0.5% by weight, ...

Embodiment 1

[0060] This example is used to illustrate the denitrification method for pyrolysis flue gas of the present invention.

[0061] use figure 1 The denitrification system shown, in which, the crude hydrogen obtained by cryogenic separation is passed through the pressure swing adsorption bed to obtain purified hydrogen and analytical gas, the purified hydrogen is discharged from the upper port of the pressure swing adsorption bed, and the analytical gas is discharged from the pressure swing adsorption bed. The lower opening of the adsorption bed is discharged and enters the cracking furnace flue from the inlet of the analysis gas configured on the cracking furnace flue, and enters the denitrification bed with the cracking flue gas entering from the bottom of the cracking furnace flue (CBL- Type III) for contact and denitrification, and then the denitrified pyrolysis flue gas is discharged from the top outlet of the cracking furnace flue, wherein:

[0062] Analytical gas, H 2 The ...

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Abstract

The invention relates to a denitration method for cracked flue gas produced in production of low-carbon olefin through steam cracking. The method comprises the following steps: (1) subjecting crude hydrogen obtained by cryogenic separation in the process of steam cracking to pressure swing adsorption so as to obtain desorbed gas containing H2, CO and CH4; and (2) subjecting the desorbed gas and the cracked flue gas to a contact reaction in the presence of a supported Pd-Pt catalyst, wherein the supported Pd-Pt catalyst uses Pd and Pt as metal active components. The denitration method for the cracked flue gas provided by the invention can effectively utilize the desorbed gas containing H2, CO and CH4 produced in the process of steam cracking, thereby reducing denitration cost for the cracked flue gas.

Description

technical field [0001] The invention relates to a denitrification method for pyrolysis flue gas produced by steam cracking to produce light olefins. Background technique [0002] Due to the increasingly stringent national standards for environmental protection emissions, the emission of flue gas from the combustion device that provides heat for the steam cracking furnace, which is the core equipment of the ethylene plant, is becoming more and more stringent. It is necessary to oxidize the nitrogen in the pyrolysis flue gas The pollutants (NOx) can be further removed to meet the emission standards. Existing flue gas treatment technologies such as NH 3 -SCR technology is mainly used in flue gas treatment of thermal power plants, but NH 3 -SCR technology requires large investment, complex system, and may produce secondary pollution such as ammonia leakage. And the pyrolysis flue gas produced by ethylene production is mainly the flue gas produced by natural gas combustion, an...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/56B01J23/44
Inventor 王育张利军王国清刘小波马天石
Owner CHINA PETROLEUM & CHEM CORP
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