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Secondary hydration and deep cooling separation combined process for separating ethene cracking gas

A combination process, ethylene cracking technology, applied in the purification/separation of hydrocarbons, hydrocarbons, hydrocarbon cracking and hydrocarbon production, etc., can solve the problems of no more reports, reduce production energy consumption and cost input, reduce tower Top cooling load, the effect of improving production efficiency

Inactive Publication Date: 2008-11-05
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current research and application status of hydrate technology is more about gas storage and transportation. How to combine hydrate technology with other operations such as gas separation has not been reported yet

Method used

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  • Secondary hydration and deep cooling separation combined process for separating ethene cracking gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1. Analysis of the separation effect and energy consumption of ethylene cracking gas in the combined process of secondary hydration separation + cryogenic separation

[0032] In this embodiment, the simulated ethylene cracking gas is separated according to the combined process flow of the present invention, the separation effect data is recorded, and the heat energy consumption in the process is analyzed.

[0033] Simulated ethylene cracking gas (feed gas) stream composition (mol%):

[0034] h 2 , 19.85%; CH 4 , 42.78%; C 2 h 4 , 33.78%; C 2 h 6 , 2.41%; C 3 h 6 , 0.35%.

[0035] The specific process is as follows:

[0036] The cracked gas stream to be separated (the pressure of the cracked gas is about 3.6MPa at this time) is first sent into the hydration reactor I, which is a hydration reaction tower that can realize multi-stage separation in this embodiment. The operating conditions of the hydration reaction tower are as follows: temperature 1°C, pr...

Embodiment 2

[0050] Embodiment 2, the single-stage hydration separation of the water liquid separation ethylene cracking gas containing SDS (500ppm)

[0051] Hydration reaction conditions: T=275.15K, P=3MPa, gas-water volume ratio is 75:1

[0052] Experimental method: The cracked gas mixture to be separated and the water-containing liquid are contacted in a high-pressure reactor to form hydrates. During the reaction process, the reaction temperature and pressure were kept constant, and when the reaction reached equilibrium, the composition of the gas phase and the composition of the gas released after the dissolution of the hydrate were analyzed respectively.

[0053] The composition of the gas released after the hydrate is dissolved is the dry basis composition of the hydrate phase (the composition of the gas after deducting the amount of water).

[0054] Table 1. Single-stage hydration separation effect of water-liquid separation of ethylene cracking gas containing SDS (500ppm)

[0055...

Embodiment 3

[0056]Embodiment 3, the single-stage hydration separation of ethylene cracking gas separation when the aqueous liquid adopts the emulsion of water+diesel

[0057] Hydration reaction conditions: T=274.15K, P=5MPa, oil-water volume ratio is 2:1, emulsifier Span 20 is used to make a water-in-oil emulsion system, and the gas-liquid volume ratio entering the hydration reaction tower is 75:1;

[0058] The experimental method is the same as in Example 2.

[0059] Table 2. The single-stage hydration separation effect of separating ethylene cracking gas when the water-containing liquid adopts water+diesel oil emulsion

[0060]

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Abstract

The present invention proposes one technological process of separating ethylene cracking gas. Hydrating separation and cryogenic separation are combined smartly, and the ethylene cracking gas is separated in twice continuous hydrating separation into hydrogen, methane and C2 component. The separated hydrogen and methane are expanded to produce cold and provide the methane eliminating tower with cold source. Compared with traditional technological process, the present invention has no stage-by-stage condensation steps and cold casing, lowered cold load of the methane eliminating tower and obviously lowered power consumption.

Description

technical field [0001] The invention relates to a separation process of ethylene cracking gas, in particular to a combined process flow for realizing the separation of ethylene cracking gas by combining a hydration separation process with a methane cryogenic separation process, and belongs to the technical field of chemical industry. Background technique [0002] As a pillar industry of the petrochemical industry, the ethylene industry has always played an important role in the national economy. With the development and requirements of various aspects, most of the existing ethylene plants are under the pressure of capacity expansion and efficiency enhancement. The most complicated part of the ethylene cracking and separation process is the cryogenic demethanization section, especially the cryogenic demethanizer, which is commonly used at present, is the bottleneck of the entire device's capacity expansion and efficiency enhancement. [0003] In the separation process of cry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/00C07C9/04C07C11/04C07C4/02
Inventor 陈光进王秀林郭绪强孙长宇马庆兰
Owner CHINA UNIV OF PETROLEUM (BEIJING)