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Treatment method of cracked gas produced by production of low-carbon olefins

A technology of low-carbon olefins and treatment methods, which is applied in the direction of combustion methods, hydrocarbon oil treatment, separation methods, etc., can solve problems such as safety hazards, and achieve the effects of avoiding safety hazards and being conducive to environmental protection

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

[0005] The purpose of the present invention is to overcome the defects of potential safety hazards due to the direct combustion of cracked gas and provide a novel treatment method for cracked gas produced in the production of low-carbon olefins

Method used

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  • Treatment method of cracked gas produced by production of low-carbon olefins
  • Treatment method of cracked gas produced by production of low-carbon olefins
  • Treatment method of cracked gas produced by production of low-carbon olefins

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preparation example Construction

[0040] The supported Pt-based catalyst of the present invention can be a commercial product, or can be prepared by a conventional method in the art. Preferably, the preparation method of the supported Pt-based catalyst comprises:

[0041] (a) Coating the slurry of pseudoboehmite and optional nickel aluminate on honeycomb cordierite (honeycomb cordierite ceramics can be used), drying and firing to obtain a honeycomb with aluminum-containing coating Cordierite, as a carrier;

[0042] (b) Coating a solution of a palladium-containing compound and an optional nickel-containing compound on the above carrier, drying and calcining to prepare a supported Pt-based catalyst.

[0043] Wherein, in order to introduce Ni into the supported Pt-based catalyst, there must be one of the part using nickel aluminate in step (a) and the part coated with nickel-containing compound in step (b).

[0044] Wherein, the palladium-containing compound may be, for example, one or more of palladium nitrate,...

preparation example 1

[0083] This preparation example is used to illustrate the hydrogenation catalyst used in the present invention.

[0084] (a) 150g of pseudo-boehmite powder (purchased from Zibo Taiguang Chemical Co., Ltd. GL-2 brand), 120 nickel aluminate and 1000g of water in a ball mill (Nanjing Laibu Technology Industrial Co., Ltd. QM model) Ball milling at 50 rpm for 2 hours to obtain a suspended slurry, which was coated on 1000 g of honeycomb cordierite ceramics (purchased from Jiangxi Xingfeng Chemical Packing Company with square holes) by dipping, and heated at 120 ° C Dry for 12 hours, extrude in extruder, and then bake at 1200°C for 6 hours to obtain α-Al 2 o 3 and nickel aluminate coated honeycomb cordierite support.

[0085] (b) immerse the carrier obtained in step (a) in an aqueous solution containing 0.4% by weight of chloroplatinic acid and 9.25% by weight of nickel nitrate for 12h, then dry at 120°C for 4h, and then calcinate at 500°C for 4h, thereby A hydrogenation catalyst ...

preparation example 2

[0087] This preparation example is used to illustrate the hydrogenation catalyst used in the present invention.

[0088] According to the method described in Preparation Example 1, the difference is that nickel aluminate is not added in the prepared pseudo-boehmite slurry in step (a), thereby obtaining hydrogenation catalyst C2, with the total amount of the catalyst being As a benchmark, the content of Pt element is 0.8% by weight, the content of Ni element is 1% by weight, and the content of Al 2 o 3 The calculated aluminum element content is 8% by weight.

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Abstract

The invention relates to a treatment method of cracked gas produced by the production of low-carbon olefins. The method comprises the following steps: 1, under the condition of non-selective hydrogenation, at the presence of a hydrogenation catalyst, carrying out non-selective hydrogenation treatment on the cracked gas, and converting alkyne and dialkene in the cracked gas into mono-olefins and / or alkane, wherein the hydrogenation catalyst is a supported type Pt series catalyst using Pt and Ni as metal active components; and 2, enabling the cracked gas which is hydrogenated at the step 1 to carry out combustion reaction with air under the presence of a supported type Pd-Pt series catalyst, wherein the supported type Pd-Pt series catalyst uses Pd and Pt as metal active components. The method provided by the invention can better avoid the problem that the direction combustion of the cracked gas has potential safety danger, and the method is particularly suitable for petrochemical small-scale and pilot tests and is favorable to environmental protection.

Description

technical field [0001] The invention relates to a treatment method for cracked gas produced by producing light olefins. Background technique [0002] Waste gases such as unsaturated olefins or their hydrocarbon derivatives produced in refineries and polyolefins are often comprehensively recycled or even converted into other products with higher value due to their high economic value, such as the cracking of existing public reports Gas hydrogenation catalytic technology often adopts a selective hydrogenation process at a lower temperature (for example, about 40-90°C) to remove alkynes as much as possible, which can minimize the loss of olefins and butadiene, which can facilitate cracking Gas recovery of organic gases such as olefins. However, petrochemical small-scale and pilot-scale test devices produce small and scattered VOCs (volatile organic compounds), which lack economic benefits and are difficult to recycle and comprehensively utilize. At the same time, the treatment...

Claims

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Application Information

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IPC IPC(8): C10G70/00C10G70/02F23G7/07B01D53/86
Inventor 张永刚王育乐毅刘小波王国清
Owner CHINA PETROLEUM & CHEM CORP
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