Method for recovering light hydrocarbon and hydrogen from tail gas of petrochemical plant

A petrochemical plant and tail gas technology, applied in combustion methods, liquefaction, incinerators, etc., can solve the problems of unattainable emission standards, potential safety hazards, and low product purity, and achieve the effect of small investment, large economic value, and improved purity.

Active Publication Date: 2016-01-20
SICHUAN TECHAIRS
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the incineration treatment method is that it causes a lot of waste of resources, and there are potential safety hazards because the tail gas may also contain oxygen
Direct discharge into the atmosphere not only wastes resources, but also causes serious environmental pollution
Most of the hydrocarbons can be recovered after being absorbed and discharged into the atmosphere. However, due to the increasingly stringent environmental protection regulations, the discharge cannot be achieved, and the existing processes for recovering light hydrocarbons from petrochemical plant tail gas generally have low recovery rate, low product purity, and low investment. Big, high energy consumption, unstable operation and other problems

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for recovering light hydrocarbon and hydrogen from tail gas of petrochemical plant
  • Method for recovering light hydrocarbon and hydrogen from tail gas of petrochemical plant
  • Method for recovering light hydrocarbon and hydrogen from tail gas of petrochemical plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for recovering light hydrocarbons and hydrogen from petrochemical plant tail gas, characterized in that: the petrochemical plant tail gas is compressed to 3.0Mpa; the compressed tail gas is condensed to -5°C, and high hydrocarbon substances such as C3 and C4 in the tail gas are converted from gaseous state It becomes liquid, and the liquid light hydrocarbons rich in C3 and C4 are separated through the gas-liquid separation tank. The non-condensable gas (pressure 3.0Mpa, temperature -5°C) in the gas-liquid separation tank is heated to 5°C through a heat exchanger. The heating medium is factory circulating water. The purpose of this step is to prevent liquid material from entering the PSA unit by controlling the temperature entering the PSA unit. After heating, the non-condensable gas enters the pressure swing adsorption tower for pressure swing adsorption, and the preheated gas (pressure 3.0Mpa, temperature 5°C) enters the pressure swing adsorption device. The ...

Embodiment 2

[0026] A method for recovering light hydrocarbons and hydrogen from petrochemical plant tail gas, characterized in that: the petrochemical plant tail gas is compressed to 2.5Mpa; the compressed tail gas is condensed to 0°C, and high hydrocarbon substances such as C3 and C4 in the tail gas change from gaseous state to It is in a liquid state, and the liquid light hydrocarbons rich in C3 and C4 are separated through the gas-liquid separation tank. The non-condensable gas (pressure 2.5Mpa, temperature 0°C) in the gas-liquid separation tank is heated to 15°C through a heat exchanger, and the heating medium Circulate water for factories. The purpose of this step is to prevent liquid material from entering the PSA unit by controlling the temperature entering the PSA unit. After heating, the non-condensable gas enters the pressure swing adsorption tower for pressure swing adsorption, and the preheated gas (pressure 2.5Mpa, temperature 15°C) enters the pressure swing adsorption device...

Embodiment 3

[0028] A method for recovering light hydrocarbons and hydrogen from petrochemical plant tail gas, characterized in that: the petrochemical plant tail gas is compressed to 2.2Mpa; the compressed tail gas is condensed to -5°C, and high hydrocarbon substances such as C3 and C4 in the tail gas are converted from gaseous state It becomes liquid, and the liquid light hydrocarbons rich in C3 and C4 are separated through the gas-liquid separation tank. The non-condensable gas (pressure 2.2Mpa, temperature -5°C) in the gas-liquid separation tank is heated to 10°C through a heat exchanger. The heating medium is factory circulating water. The purpose of this step is to prevent liquid material from entering the PSA unit by controlling the temperature entering the PSA unit. After heating, the non-condensable gas enters the pressure swing adsorption tower for pressure swing adsorption, and the preheated gas (pressure 2.2Mpa, temperature -5°C) enters the pressure swing adsorption device. Th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for recovering light hydrocarbon and hydrogen from tail gas of a petrochemical plant. According to the method, firstly, the tail gas of the petrochemical plant is compressed and then condensed, and meanwhile condensed hydrocarbon substances are recovered; then, pressure swing adsorption is carried out on the remaining tail gas, and the hydrogen is recovered; afterwards, desorbed gas obtained after pressure swing adsorption is pressurized and condensed, meanwhile, condensed hydrocarbon substances are recovered, and the remaining tail gas enters a gas pipe network to be burned; and then, the hydrocarbon substances recovered two times enter a rectifying tower in a mixed mode to be separated, and therefore the C3 light hydrocarbon and the C4 light hydrocarbon are separated out. According to the method, the recovery rate of the hydrogen is higher than 88%, the recovery rate of the light hydrocarbon is higher than 90%, the purity of collected C3 is higher than 92 mol%, and the purity of collected C4 is higher than 99 mol%.

Description

technical field [0001] The invention relates to the field of tail gas treatment, in particular to a method for recovering light hydrocarbons and hydrogen from petrochemical plant tail gas. Background technique [0002] The tail gas of some petrochemical plants contains hydrogen and light hydrocarbons such as carbon 2, carbon 3, carbon 4, and carbon 5. The current treatment methods include incineration in incinerators, direct discharge into the atmosphere, and discharge into the atmosphere after absorption. The disadvantage of the incineration treatment method is that it causes a lot of waste of resources, and there are potential safety hazards because the tail gas may also contain oxygen. Direct discharge into the atmosphere not only wastes resources, but also causes serious environmental pollution. Most of the hydrocarbons can be recovered after being absorbed and discharged into the atmosphere. However, due to the increasingly stringent environmental protection regulation...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/02F23G7/06
Inventor 钟雨明钟娅玲叶易春陈运牟树荣肖军王波刘兴龙刘开莉
Owner SICHUAN TECHAIRS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap