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A process and device for recycling and treating organic waste gas with two-stage membrane

A technology for recycling organic waste gas, applied in gas treatment, membrane technology, separation methods, etc., can solve problems such as increased condenser load, imperfect process technology, and reduced condensation recovery rate, so as to reduce load and reduce the amount of concentrated gas , Increase the effect of recycling efficiency

Active Publication Date: 2021-08-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem is that the condensed gas after crossing the membrane must be mixed with the gas to be treated for condensation, which increases the load on the condenser and reduces the condensation recovery rate
At the same time, it also increases the load of the membrane process, which will easily lead to the deterioration of the exhaust gas index
To sum up, the existing technology combining membrane and compression condensation still has some defects in process technology and unreasonable design, which needs to be optimized.

Method used

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  • A process and device for recycling and treating organic waste gas with two-stage membrane
  • A process and device for recycling and treating organic waste gas with two-stage membrane
  • A process and device for recycling and treating organic waste gas with two-stage membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0083] Treatment of hexene production units in refineries, raw material storage tanks and waste oil storage tanks, the original tail gas treatment and upgrading equipment, the tail gas composition (volume fraction) is mainly nitrogen, and the total non-methane hydrocarbons are 25000mg / m 3 , of which aromatic compounds 7000mg / m 3 , alkanes 18000mg / m 3 . Hydrocarbons mainly include alkanes, olefins and a small amount of aromatics and sulfides. The membrane area of ​​the device is 23m 2 , in the form of roll-type membrane modules, the first-stage membrane is 18m 2 , secondary membrane 5m 2 . Activated carbon adsorption tank volume 0.6m 3 , using coconut shell activated carbon loaded with basic functional groups, the particle size is 2mm. The total gas flow rate is 40~50m 3 / h, the main operating conditions of the process unit are shown in Table 1 below, and the process results are shown in Table 2:

[0084] Table 1, Device Operating Conditions

[0085] name ...

Embodiment 2

[0089] Treat the exhaust gas from the catalytic cracking unit of the refinery and the breathing valve of the waste oil storage tank (the storage tank has a nitrogen seal). The waste gas consists of 93% nitrogen and 7% hydrocarbons. Hydrocarbons mainly include alkanes, olefins, aromatics, ethers, and halogenated hydrocarbons, as well as sulfur-containing components such as hydrogen sulfide and mercaptans. The average gas flow rate is 100Nm 3 / h, device membrane area 130m 2 , primary membrane 100m 2 , which are five roll-type membrane modules connected in parallel, and the secondary membrane is a disc-type membrane module with a filling area of ​​30m 2 . The volume of each activated carbon adsorption tank is 4.5m 3 , using coconut shell activated carbon loaded with basic functional groups, the particle size is 2mm. Process device parameters such as temperature, pressure, flow rate, etc. are shown in Table 3 below. The total composition of gas, total non-methane hydrocarbon...

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Abstract

The invention relates to a process and a device for recycling and treating organic waste gas with a secondary membrane. Including oil storage tank, buffer tank, gas mixing tank, primary membrane unit, activated carbon adsorption unit, compression heat exchange condensing unit, secondary membrane unit, condensation liquid separation tank. The entire process is divided into a treatment cycle of low-concentration gas primary membrane separation, activated carbon adsorption, and a treatment cycle of high-concentration gas compression condensation and efficient separation through a secondary membrane process. Realize the separation of low-concentration gas and high-concentration gas in the process, not only avoid back-mixing, but also efficiently separate the compressed and condensed gas, recover the high-value organic matter in the tail gas, and reduce the treatment cycle and condensation cycle The load improves the recovery efficiency and tail gas index, and reduces the energy consumption of the process. Compared with the prior art, under the same membrane dosage, the recovery rate of organic matter is increased by 9.1%, the tail gas concentration is reduced by 18%, and the total energy consumption is reduced by 14.5%.

Description

technical field [0001] The invention relates to a process and a device for recovering and treating organic waste gas by secondary membrane circulation, which is mainly used in the recovery and treatment of organic waste gas discharged during production, storage and transportation of oil products, and loading and unloading in petroleum refining and chemical enterprises. Background technique [0002] With the improvement of the country's economic level and the transformation of people's ideas, the environmental protection indicators of petrochemical enterprises such as oil refining and chemical industry have been continuously improved. In the process of production, storage and transportation, a large amount of volatile organic matter is emitted, causing large environmental pollution and waste of resources. If this part of organic waste gas can be recycled and utilized efficiently, good environmental and economic benefits will be obtained. [0003] There are two main types of o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04B01D53/22B01D53/00
CPCB01D53/00B01D53/002B01D53/225B01D53/229B01D2259/40083
Inventor 魏昕杨丽栾金义杨永强
Owner CHINA PETROLEUM & CHEM CORP
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