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A refinery dry gas c 2 、c 3 Method for recovering components, light hydrocarbon components and hydrogen

A technology of refinery dry gas and recovery method, which is applied to the recovery of C2, light hydrocarbon components and hydrogen in refinery dry gas, and the field of C3 components. It can solve the problems of resource waste, reduce emissions, increase recovery, The effect of improving the utilization rate

Active Publication Date: 2017-09-26
CATHAY CHEM DALIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after recovery of hydrogen, the refinery dry gas containing a large amount of light hydrocarbon components is still not well utilized, but is used as industrial fuel gas and civil fuel gas, and the excess is burned by torch, resulting in a serious waste of resources

Method used

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  • A refinery dry gas c <sub>2</sub> 、c <sub>3</sub> Method for recovering components, light hydrocarbon components and hydrogen
  • A refinery dry gas c <sub>2</sub> 、c <sub>3</sub> Method for recovering components, light hydrocarbon components and hydrogen
  • A refinery dry gas c <sub>2</sub> 、c <sub>3</sub> Method for recovering components, light hydrocarbon components and hydrogen

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Embodiment 1

[0025] (1) Deacidification gas: Refinery dry gas, that is, raw material gas, can pass through an absorption tower for deacidification solution, or an adsorption tower equipped with desulfurization and decarbonization adsorbents to remove H 2 S and CO 2 and other acid gases.

[0026] (2) Condensation and recovery of light hydrocarbon components: the raw material gas from which acid gases have been removed enters the refrigeration system, and after being condensed to -15°C~0°C, enters the gas-liquid separation tank for gas-liquid separation. Condensation temperature can recover light hydrocarbons and C as required 2 、C 3 The amount is adjusted and condensed to obtain liquid light hydrocarbon components.

[0027] In order to obtain more ethylene raw materials, the liquid light hydrocarbon component recovered by condensation is heated to 20°C through a heat exchanger, and the C in it is separated 1 ~C 3 Component, isolated C 1 ~C 3 The components are mixed with the ethylene...

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Abstract

The invention discloses a method for recovering C2 component, C3 component, light dydrocarbon component and hydrogen gas in refinery dry gas. The method is characterized by comprising the following steps: condensing liquid light dydrocarbon component at below 15-0 DEG C from the refinery dry gas and recovering; (2) feeding the refinery dry gas which is not condensed into a temperature swing adsorption tower, selectively adsorbing C4-C6 components by using an adsorbing agent in the tower, desorbing C4-C6 components and recovering; (3) feeding non-adsorbed gas into the temperature swing adsorption tower, selectively adsorbing C2 and C3 components by using the adsorbing agent in the tower, desorbing the C2 and C3 components and recovering; (4) feeding non-adsorbed gas to membrane separation equipment, enriching hydrogen gas at the permeation side under the permeability of the membrane and recovering; and (5) adsorbing foreign gas except the hydrogen gas from hydrogen gas enriched gas through a pressure swing adsorption tower to obtain purified hydrogen gas products.

Description

technical field [0001] The invention relates to a kind of C in refinery dry gas 2 、C 3 Components, light hydrocarbon components and hydrogen recovery methods. Background technique [0002] During the secondary processing of crude oil, a large amount of refinery dry gas will be produced, such as catalytic cracking dry gas, coking dry gas, delayed coking dry gas, various hydrogenated low fraction gas, tower top gas, etc. Refinery dry gas mainly contains hydrogen, methane, ethylene, ethane, propylene, propane and other components, and also contains a certain amount of C 4 ~C 6 Components, which are important resources for petrochemicals, especially hydrogen, C 2 、C 3 Components and liquefied petroleum gas components. At present, domestic refineries need a large amount of hydrogen due to product quality upgrades, and all factories have paid attention to the recycling of hydrogen. The common hydrogen recovery methods are pressure swing adsorption and membrane separation. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/00B01D53/04B01D53/047B01D53/22B01D53/18C07C11/04C07C7/00C01B3/50
Inventor 李莹王甦郎凯张北屿冯宝林于艳林彭宇光
Owner CATHAY CHEM DALIAN