Method and device for separating ethylene and propylene from pyrolysis gas and/or dry gas

A cracking gas and dry gas technology, applied in the chemical industry, can solve the problems of complex refrigeration and heat exchange process, large cooling capacity consumption, low ethylene concentration, etc., achieve wide applicability of raw materials, simplify heat exchange process, and reduce refrigeration load Effect

Pending Publication Date: 2020-06-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ethylene concentration in the product obtained by this method is low, and it still needs to be sent to the ethylene plant for further purification. At the same time, the required operation of the reabsorption tower requires the introduction of a large amount of gasoline absorbent
[0008] In summary, the commonly used cracking gas separation process in industry requires cryogenic conditions, complex refrigeration and heat transfer processes, large cooling capacity consumption and high investment, while the current oil absorption method is mainly used to separate rich Concentrated gas containing carbon 2 and carbon 3 is used as raw material for ethylene cracking. It is not suitable for refineries without supporting ethylene equipment to obtain products such as polymer grade ethylene and propylene. At the same time, a reabsorption tower or cold box-expansion is required in the oil absorption process machine to reduce the loss of absorbent, the process is more complicated

Method used

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  • Method and device for separating ethylene and propylene from pyrolysis gas and/or dry gas
  • Method and device for separating ethylene and propylene from pyrolysis gas and/or dry gas
  • Method and device for separating ethylene and propylene from pyrolysis gas and/or dry gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] In this example, cracked gas produced by steam cracking of light hydrocarbons such as C4, gas fraction propane and liquefied gas in a refinery is used as raw material. The specific composition of the cracked gas is shown in Table 1.

[0063] Table 1

[0064]

[0065]

[0066] use as figure 1 Separation flow diagram shown, separation of ethylene and propylene from cracked gas and / or dry gas.

[0067] The separation device includes a compressor 2, a purification unit 3, a cooler 4, an oil absorption tower 5, a light hydrocarbon separation unit, and an olefin rectification unit, wherein the light hydrocarbon separation unit includes a demethanizer 8, a deethanizer 9, a deethanizer The propane tower 6 and the debutanizer 7, the olefin rectification unit includes an ethylene rectification tower 11 and a propylene rectification tower 10.

[0068] The compressor 2 is sequentially connected with the purification unit 3, the cooler 4, and the oil absorption tower 5;

[...

Embodiment 2

[0086] In this example, a stream of FCC dry gas is added to the raw material in Example 1, that is, the cracked gas and FCC dry gas are processed simultaneously, and the FCC dry gas is mixed with the cracked dry gas at the second-stage outlet of the compressor and sent to the compressor together. The third stage: because the FCC dry gas contains oxygen and carbon dioxide, in the purification process 3, the mixed gas is deoxidized, decarburized and dried in sequence. The specific composition of FCC dry gas is shown in Table 3.

[0087] table 3

[0088]

[0089]

[0090] The difference between operating conditions and embodiment 1 is:

[0091] (4) Absorption: The theoretical plate number of the oil absorption tower 5 is 40, the operating pressure is 3MPaG, the tower top temperature is 7.9°C, the tower top condenser outlet temperature is -35°C, and the tower bottom temperature is 92.4°C;

[0092] (5) Depropanization: The theoretical plate number of the depropanization tow...

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Abstract

The invention belongs to the field of chemical engineering, and particularly discloses a method and a device for separating ethylene and propylene from pyrolysis gas and / or dry gas. The separation method comprises the steps of compression, purification, cooling, absorption, light hydrocarbon separation, ethylene rectification, and propylene rectification. The method is based on a shallow cold oilabsorption technology, directly produces a polymer-grade ethylene product and a polymer-grade propylene product from pyrolysis gas and / or dry gas on the premise that the refrigeration and heat exchange processes are simplified, the refrigeration load is reduced and the investment is saved, and has great industrial application prospects.

Description

technical field [0001] The invention belongs to the field of chemical industry, and more specifically relates to a method and a device for separating ethylene and propylene from cracked gas and / or dry gas. Background technique [0002] Petroleum hydrocarbon cracking to produce low-carbon olefins is the leader of the petrochemical industry. Tube furnace cracking technology is the main technology for producing low-carbon olefins today. The process is through steam cracking of cracking raw materials such as ethane, propane, light hydrocarbons, and naphtha. , generate cracked gas containing heavy components such as hydrogen, methane, carbon 2, carbon 3, carbon 4, carbon 5, etc., and then separate and purify the cracked gas in the subsequent separation system, and finally obtain products such as polymer grade ethylene and polymer grade propylene . [0003] At present, the cracking gas separation process that occupies an important position in the world's ethylene industry is main...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/04C07C7/11C07C11/06C07C11/04
CPCC07C7/005C07C7/04C07C7/11Y02P30/40
Inventor 张敬升邵华伟邹弋刘智信罗淑娟李东风廖丽华
Owner CHINA PETROLEUM & CHEM CORP
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