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Ethane dehydrogenation method

A technology for ethane and dehydrogenation, applied in chemical instruments and methods, chlorine/hydrogen chloride, hydrocarbons, etc., can solve problems such as separation, poor mass transfer and heat transfer performance, and improve mass transfer and heat transfer performance, production operations , the effect of easy production

Active Publication Date: 2015-11-04
ZHONGKE YIGONG SHANGHAI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention has the characteristics of simple process, energy saving and high yield, and solves the problem of Ni and NiCl 2 The separation of solids and poor mass and heat transfer performance, while controlling the depth of ethane dehydrogenation according to production requirements, and by-product part of acetylene while producing ethylene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) NiCl 2 powder suspended on nickel-bismuth alloy melt to obtain NiCl 2 and nickel-bismuth alloy suspension;

[0050] (2) Pass ethane into NiCl 2 In the suspension of nickel-bismuth alloy, the reaction temperature is controlled to be 550°C, and the flow rate of ethane is controlled so that the conversion rate of ethane is 76%. 2 h 4 Mixed gas with HCl, solid NiCl 2 It is reduced to Ni and melted in nickel-bismuth alloy melt;

[0051] (3) chlorine gas is passed into step 2) in the nickel-bismuth alloy melt that obtains, and the temperature of control chlorination is 550 ℃, makes Ni and Cl 2 The reaction produces NiCl 2 Suspended on nickel-bismuth alloy, controlled Cl 2 The molar ratio with Ni is 1:1, NiCl 2 continue to react with ethane;

[0052] (4) the obtained step 2) containing C 2 h 4 The mixed gas with HCl absorbs HCl with water to obtain ethylene and hydrochloric acid as a by-product; see Table 1 for the main components of the ethane dehydrogenation t...

Embodiment 2

[0056] (1) NiCl 2 powder suspended on nickel-bismuth alloy melt to obtain NiCl 2 and nickel-bismuth alloy suspension;

[0057] (2) Pass ethane into NiCl 2 In the suspension of nickel-bismuth alloy, the reaction temperature is controlled at 650°C, and the flow rate of ethane is controlled so that the conversion rate of ethane is 86%. 2 h 4 Mixed gas with HCl, solid NiCl 2 It is reduced to Ni and melted in nickel-bismuth alloy melt;

[0058] (3) Chlorine is fed into the nickel-bismuth alloy melt that step 2) obtains, and the temperature of control chlorination is 650 ℃, makes Ni and Cl 2 The reaction produces NiCl 2 Suspended on nickel-bismuth alloy, controlled Cl 2 The molar ratio with Ni is 0.9:1, NiCl 2 continue to react with ethane;

[0059] (4) the obtained step 2) containing C 2 h 4 The mixed gas with HCl absorbs HCl with water to obtain ethylene and hydrochloric acid as a by-product; see Table 2 for the main components of the ethane dehydrogenation tail gas aft...

Embodiment 3

[0063] (1) NiCl 2 powder suspended on nickel-bismuth-lead alloy melt to obtain NiCl 2 and nickel-bismuth-lead alloy suspension;

[0064] (2) Pass ethane into NiCl 2 In the suspension of nickel-bismuth-lead alloy, the reaction temperature is controlled at 700°C, and the flow rate of ethane is controlled so that the conversion rate of ethane is 96%. 2 h 4 、C 2 h 2 Mixed gas with HCl, solid NiCl 2 It is reduced to Ni and melted in nickel-bismuth-lead alloy melt;

[0065] (3) chlorine gas is passed into step 2) in the nickel-bismuth-lead alloy melt that obtains, and the temperature of control chlorination is 700 ℃, makes Ni and Cl 2 The reaction produces NiCl 2 Suspended on nickel-bismuth-lead alloy, controlling Cl 2 The molar ratio with Ni is 0.7:1, NiCl 2 continue to react with ethane;

[0066] (4) the obtained step 2) containing C 2 h 4 、C 2 h 2 The mixed gas with HCl absorbs HCl with water to obtain ethylene and acetylene and hydrochloric acid as by-products; se...

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Abstract

The present invention relates to an ethane dehydrogenation method. The method comprises the following steps of: suspending NiCl2 powder in an alloy melt to obtain a suspension of NiCl2 and an alloy; introducing ethane to the suspension of NiCl2 and to alloy to perform reaction to obtain a mixed gas containing C2H4 and HCl, where NiCl2 is reduced to Ni and melt into the alloy melt; introducing Cl2 into the alloy melt, NiCl2 obtained through reaction between Cl2 and Ni continuing to react with ethane; or separating the alloy melt out, introducing air or oxygen into NiCl2, NiO obtained through reaction between the air or oxygen and Ni absorbing HCl in the mixed gas containing C2H4 and HCl, to obtain NiCl2 and ethylene after the reaction, and recycling the obtained NiCl2. The method has advantages of being simple in process, high in efficiency and high in yield, and solves the problems of separation between solid Ni and solid NiCl2 and the poor mass transfer and heat transfer; the depth of ethane dehydrogenation is controlled according to the production requirements, and some acetylene is produced as a byproduct during production of ethylene.

Description

technical field [0001] The invention relates to a new method for ethane dehydrogenation, which belongs to the field of chemical production. Background technique [0002] Ethane mainly exists in petroleum gas, natural gas, coke oven gas and petroleum cracking gas, and is obtained by separation. At present, the most widely used ethane is to produce ethylene. The methods for producing ethylene from ethane mainly include steam pyrolysis, oxidative dehydrogenation and so on. [0003] Steam thermal cracking is the traditional method of producing ethylene from ethane. Because the reaction temperature of this method is above 800°C, the pyrolysis temperature is high, the energy consumption is large, and the requirements for equipment materials are strict, so the production cost is high. At the same time, other heavy olefins such as propylene, butadiene and aromatic hydrocarbons will also be produced in the product, which reduces the ethylene yield. [0004] The patent with applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C5/333C01B7/01C07C19/045C07C17/154
Inventor 钟劲光刘星刘雪花
Owner ZHONGKE YIGONG SHANGHAI CHEM TECH CO LTD
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