Method for continuously preparing ethylene by using ethane

A technology for producing ethane and ethylene, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of difficult handling, low added value of hydrochloric acid, increased cost, etc., and achieve single-pass conversion rate and selectivity improvement. Effect

Active Publication Date: 2015-04-22
ZHONGKE YIGONG SHANGHAI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But if this method is used to produce C 2 h 4 Chlorine source needs to be supplemented, the cost increases, and the added value of hydrochloric acid produced is low and difficult to handle

Method used

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  • Method for continuously preparing ethylene by using ethane
  • Method for continuously preparing ethylene by using ethane

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Continuous production of ethylene from ethane:

[0032] (1) Mix 1.0mol ethane with 1.0mol NiCl 2 reaction, the reaction temperature is controlled at 550°C, and the reaction time is 500s, that is, C 2 h 4 Mixed gas with HCl, solid NiCl 2 is reduced to Ni;

[0033] (2) Use the NiCl from the subsequent cycle 2 The C obtained by the solution absorption step (1) reaction 2 h 4HCl in mixed gas with HCl to a hydrochloric acid concentration of 25wt%, NiCl in solution 2 Crystallized out, filtered to get NiCl 2 Solid and hydrochloric acid solution; NiCl obtained by filtration 2 The temperature generated by the subsequent step (1) is at a temperature of about 500° C. 2 h 4 Dry with HCl mixed gas to get 1.0mol NiCl 2 You can return to step (1) for recycling;

[0034] (3) See Table 1 for the main components of the gas phase after removing HCl, and after further rectification and purification, 0.89mol of ethylene with a purity of 99.9% was obtained;

[0035] (4) The hydr...

Embodiment 2

[0040] Continuous production of ethylene from ethane:

[0041] (1) Mix 1.0mol ethane with 1.5mol NiCl 2 reaction, the reaction temperature is controlled at 650°C, and the reaction time is 180s, that is, C 2 h 4 Mixed gas with HCl, solid NiCl 2 is reduced to Ni;

[0042] (2) Use the NiCl from the subsequent cycle 2 The C obtained by the solution absorption step (1) reaction 2 h 4 HCl in mixed gas with HCl to saturation, NiCl in solution 2 Crystallized out, filtered to get NiCl 2 Solid and saturated hydrochloric acid solution; NiCl obtained by filtration 2 The temperature generated by the subsequent step (1) is at a temperature of about 650° C. 2 h 4 Dry with HCl mixed gas to get 1.5mol NiCl 2 You can return to step (1) for recycling;

[0043] (3) See Table 2 for the main components of the gas phase after removing HCl. After further rectification and purification, 0.91 mol of ethylene with a purity of 99.2% was obtained.

[0044] (3) react the saturated hydrochloric...

Embodiment 3

[0049] Continuous production of ethylene from ethane:

[0050] (1) Mix 1.0mol ethane with 2.0mol NiCl 2 reaction, the reaction temperature is controlled at 750°C, and the reaction time is 10s, that is, C 2 h 4 Mixed gas with HCl, solid NiCl 2 is reduced to Ni;

[0051] (2) Use the NiCl from the subsequent cycle 2 The C obtained by the solution absorption step (1) reaction 2 h 4 HCl in mixed gas with HCl to saturation, NiCl in solution 2 Crystallized out, filtered to get NiCl 2 Solid and saturated hydrochloric acid solution; NiCl obtained by filtration 2 The temperature generated by the subsequent step (1) is at a temperature of about 750° C. 2 h 4 Dry with HCl mixed gas to get 2.0mol NiCl 2 You can return to step (1) for recycling;

[0052] (3) The main components of the gas phase product after removing HCl are shown in Table 3. After further rectification and purification, 0.94 mol of ethylene with a purity of 98.8% was obtained.

[0053] (4) react the saturated ...

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Abstract

The invention relates to a method for continuously preparing ethylene by using ethane. The method comprises the following steps: firstly, enabling ethane to react with NiCl2 to obtain C2H4 and HCl mixed gas; reducing solid NiCl2 into Ni; absorbing HCl from the C2H4 and HCl mixed gas by using a circulating NiCl2 solution; precipitating, crystalizing and separating the NiCl2 solution in which HCl is absorbed to obtain solid NiCl2 and a hydrochloric acid solution; drying the obtained solid NiCl2 and recycling; absorbing C2H4 gas from which HCl gas is removed, and performing rectification separation to obtain a C2H4 product; enabling the hydrochloric acid solution to react with Ni generated in the previous reaction to obtain H2 and a NiCl2 solution; recycling the obtained NiCl2 solution. During the process of the method, Ni is taken as an intermediate medium for circular reaction, and the method has the characteristics of low energy consumption, high yield, and use of recyclable medium nickel and capability of producing a byproduct H2 energy.

Description

technical field [0001] The invention relates to a new method for continuously producing ethylene from ethane, which belongs to the field of chemical synthesis. Background technique [0002] Ethylene is a leading product in the petrochemical industry and an important basic chemical raw material. All countries in the world generally regard the ethylene industry as an important part of their industrial layout, and ethylene production is also regarded as the embodiment of a country's comprehensive economic strength. At present, the production methods of ethylene mainly include steam cracking, oxidative dehydrogenation of ethane, ethylene from natural gas, and ethylene from coal. Among them, ethane is the most economical raw material, and the current methods for producing ethylene from ethane include thermal cracking and oxidative dehydrogenation. [0003] In the natural gas to ethylene process, it is first necessary to convert natural gas to produce synthesis gas, which is the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C5/44
Inventor 钟劲光刘星刘雪花
Owner ZHONGKE YIGONG SHANGHAI CHEM TECH CO LTD
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