Lightweight alkene separation method reducing absorbent usage amount and device thereof

A technology for light olefins and separation methods, which is applied in the directions of absorption purification/separation, adsorption purification/separation, distillation purification/separation, etc., and can solve problems such as the reduction of propylene content, the reduction of the use value of absorbents, and the increase of energy consumption for separation.

Active Publication Date: 2013-10-02
CHINA CONSTR IND & ENERGY ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] In summary, according to the characteristics of light olefin products from oxygenates, it is reasonable to avoid cryogenic separation; for the oil washing process, the main difference lies in the choice of absorbent and the sequence of the process arrangement, and its main disadvantages are : The amount of solvent circulation is very large, and the energy consumption of the cooling cycle after solvent regeneration is significant, and part of the absorbent will be used as fuel gas with the absorption tower top gas, which reduces the use value of the absorbent itself. The process has certain restrictions on the selection of solvents. Adding a desorption device and increasing the temperature of the demethanizer makes the

Method used

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  • Lightweight alkene separation method reducing absorbent usage amount and device thereof
  • Lightweight alkene separation method reducing absorbent usage amount and device thereof
  • Lightweight alkene separation method reducing absorbent usage amount and device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0080] like figure 1 and image 3 In the lighting method of a light olefin that reduces the amount of absorption agent, the converter of oxidation compounds is converted to remove the light olefin hybrid gases. After removing the oxidation compounds and water during pre -treatment, in addition to including ethylene and acrylia, in addition to including ethylene and acrylic, in addition to including ethylene and acrylic, in addition to including ethylene and acrylic, in addition to including ethylene and acrylic, in addition to including ethylene and acrylic, in addition to including ethylene and acrylic, it is included.It also includes hydrogen, oxygen, nitrogen, carbon dioxide, carbon dioxide, methane, ethylene, ethylene, acetylene, propionide, propane, propane, and propane.After the mixed material is compressed and the heat changes are used as a light olefin logistics 1, it is divided into two phases of steam liquid, of which the steam phase is 1-1 through the pipeline, and the l...

Embodiment 2

[0096] like figure 2 and image 3 The difference between the embodiment and Example 1 is that the absorption tower uses the propane 57 produced by the deoxane tower bottom as the absorbent, and the method described in the example of this embodiment.After mixing the rough ethylene gas obtained from the transformer in front of the machine, press it to be pressed to 2.0MPa after the pre -processing and removed impurities. After cooling to 15 ° C, the raw material for the olefin separation system is sent to the deoxane tower system.The low-voltage deoxane tower bottom product is sent to the deoxane tower, and the high-voltage decarcular tower product is pressed to 3.2 MPA to cool to -37 ° C after being cooled to -37 ° C.The products of the deoxyne tower are entered into the deoxyne tower and subsequently separated. The ethylene products are obtained from the side line of the ethylene refined tower.The refrigerant refrigerate, non -condensed hydrogen, methane, and some ethylene are dist...

Embodiment 3

[0100] The difference between Example 3 and Example 1 is that the numerical parameters involved are: the operating pressure of the high -voltage deoxane tower is 1.8MPa, and the temperature of the high -pressure deoxane tower bottom is 100 ° C;The operating pressure of the tower top is 0.5MPa, and the temperature of the low-pressure deoxane tower tower is 100 ° C; the operating pressure of the tower tower top of the tower tower is 3.5MPa;The temperature of the tower bottom is -5 ° C, and the tower kettle is heated in circulating water; the temperature of the absorbent in the absorption tower is -40 ° C, and the operating pressure of the absorption tower is 4.0MPa;Sexual activation carbon, adsorption pressure is 3.5MPa, and adsorption temperature is -15 ° C; the operating pressure of the pendulum tower tower is 2.0MPa;The operating pressure is 1.0MPa; the temperature of the moisty-refined tower bottom temperature is -30 ° C; the ethylene refined tower kettle is heated with circulat...

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Abstract

The invention discloses a lightweight alkene separation method reducing absorbent usage amount and a device thereof. Lightweight alkene reaction gas converted from oxygen-containing compound is subjected to a pre-treatment and then induced to a double-tower depropanization system. The product in the top of the towers of the depropanization system cools and is transported to a demethanation tower, in the top of the demethanation tower only propylene cooler is used to cool materials, the gas phase in the top of the tower is transported to a tower, which is provided with a heat exchanger in the middle or in the top, to absorb carbon dihydrocarbon, the gas discharged from the absorption tower is induced into a pressure swing absorption device to further recycle ethylene, recycled coarse ethylene gas mixes with lightweight ethylene reaction gas before returning to a section of compressor. The invention provides a non-deep-cold lightweight alkene separation method, which has the advantages of small investment, low energy consumption, small absorbent circulation volume and high material recovery rate.

Description

Technical field [0001] The present invention is the field of light -quality olefin separation and purification technology. It involves a raw material for a raw material (mainly a methanol, ethanol, di methaol, C4 ~ C10 alcohol compound or mixture, etc.).In the process of logistics (mainly ethylene and acryl), its product is separated by the separation method and equipment of its product light olefin gas. Background technique [0002] The sources of traditional ethylene and acrylic are mainly petroleum steam cracking. The raw materials are mainly petroleum oil, while my country's oil resources are short of shortage. This is the main reason to restrict the development of the ethylene industry in my country.With the increasing tension of oil supply, the otakosaidal compounds to make light olefins (OTO processes) have become a hotspot of research. Its representative methanol olefin technology (MTO) has become increasingly mature, and it has opened up coal or natural gas through gasif...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C11/06C07C7/11C07C7/12C07C7/04
Inventor 相咸高梅华徐义明朱忆宁董巍巍张少石陈静
Owner CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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