Method for separating catalytic dry gas in refinery by using shallow cold oil absorption method

A shallow cold oil absorption and dry gas technology, applied in the petroleum industry, recovery of liquid hydrocarbon mixtures, etc., can solve the problems of large investment, high energy consumption, reduction of absorbent circulation and loss, and achieve low investment and simple operation , The effect of strong adaptability of raw materials

Active Publication Date: 2010-02-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0011] In order to solve the problems of large investment and high energy consumption in the existing technology for recovering olefins and alkanes from refinery dry gas, the present invention proposes an efficient method for separating refinery catalytic dry gas by using shallow cold oil absorption method, the method Using

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  • Method for separating catalytic dry gas in refinery by using shallow cold oil absorption method

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Embodiment 1

[0039] The composition of catalytic dry gas in a refinery is listed in Table 1.

[0040] Table 1 Composition of catalytic dry gas in a refinery

[0041]

[0042] (1) Compression: After the refinery FCC with a flow rate of 13500kg / h is compressed by the first stage of the compressor, its pressure is increased to 1.4MPa, and the acid gas, NOx and oxygen are removed through the purification system 2, and then the second stage of the compressor After section 3 is compressed, it enters dryer 4 for drying, and finally the pressure of catalytic dry gas is increased to 2.4MPa;

[0043] (2) Cooling: Cool the dried catalytic dry gas to -15°C;

[0044] (3) absorption: flow is 52375kg / h by the C5 that pentane 37wt%, isopentene 23wt%, n-pentene 17wt%, pentene-223wt% are formed as absorbent, sprays into from absorption tower 5 tops, absorbs C2 and components above C2 fraction in catalytic dry gas. The theoretical plate number of the absorption tower is preferably 45, the operat...

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Abstract

The invention discloses a method for separating catalytic dry gas in a refinery by using a shallow cold oil absorption method, which belongs to the technical field of separation and recovery of olefin and alkane. In order to solve the problems of large investment and high power consumption in the prior process of recovering the olefin and the alkane from the dry gas of the refinery, the inventionprovides a high-efficient method for separating the catalytic dry gas in the refinery by using the shallow cold oil absorption method. The method uses a C5 fraction as an absorbent, maintains an absorption temperature at shallow cold higher than 20 DEG C below zero, and adopts an expansion machine and a cold box to recover cold amount to significantly improve the recovery rate of the olefin and the alkane and simultaneously reduce the cycle amount and the loss amount of the absorbent so as to reduce the power consumption.

Description

technical field [0001] The invention relates to a method for separating and recovering olefins and alkanes, in particular to a method for separating and recovering olefins and alkanes from catalytic dry gas in a refinery. Background technique [0002] Catalytic dry gas in refinery comes from catalytic cracking process. Usually, the content of ethylene in the dry gas is about 12-20 mol%, the content of ethane is about 15-24 mol%, and it also contains alkenes and alkanes such as propylene, propane and butane. At present, catalytic dry gas in refineries is mainly burned as fuel, and its utilization value is low. If the olefins and alkanes in the catalytic dry gas are recovered and sent to the ethylene plant as the raw material for ethylene production, a large amount of cracked raw material oil can be saved, the cost of ethylene production can be greatly reduced, and the enterprise can obtain better economic benefits. [0003] At present, the methods for recovering ethylene fro...

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Application Information

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IPC IPC(8): C10G5/04
Inventor 过良程建民李东风廖丽华刘智信王婧李晓峰李琰
Owner CHINA PETROLEUM & CHEM CORP
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