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Method for treating light hydrocarbon-containing petrochemical gas

A petrochemical and processing method technology, which is applied to the processing field of petrochemical gas containing light hydrocarbons, can solve the problems such as the ineffective utilization of C2 light hydrocarbons, and achieves good recovery effect and significant economic benefits.

Active Publication Date: 2012-10-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, in the process of recovering a large amount of petrochemical gas containing light hydrocarbons produced by atmospheric and vacuum distillation, catalytic cracking, cracking, coking, catalytic reforming, isomerization and other processes, the carbon two components are generally not separated separately Instead, it is mixed with other light hydrocarbons and burned directly, resulting in a large amount of high-value C2 light hydrocarbons not being effectively utilized

Method used

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  • Method for treating light hydrocarbon-containing petrochemical gas
  • Method for treating light hydrocarbon-containing petrochemical gas
  • Method for treating light hydrocarbon-containing petrochemical gas

Examples

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Embodiment 1

[0047] This embodiment is used to illustrate the treatment method for petrochemical gas containing light hydrocarbons provided by the present invention.

[0048] This example uses figure 2 The process flow shown. Such as figure 2As shown, (1) After the compressed hydrocarbon-containing tail gas ① is contacted with the first rich absorption liquid from the bottom of the first absorption tower T-101 in the absorption balance tank V-101 for gas-liquid phase separation, the gas phase enters the first At the bottom of the absorption tower T-101, conduct reverse contact mass transfer with the first absorbent naphtha entering from the top of the T-101 tower to obtain the first rich absorption liquid ④ and the first lean gas ②, and transfer them from the bottom and top of the tower respectively Discharge; (2) The first lean gas from the top of the first absorption tower T-101 ② enters from the bottom of the second absorption tower T-102, and the second absorbent diesel enters from...

Embodiment 2

[0051] This embodiment is used to illustrate the treatment method for petrochemical gas containing light hydrocarbons provided by the present invention.

[0052] According to the method of embodiment 1, the petrochemical gas containing light hydrocarbons is processed, and the difference is that the image 3 process flow. image 3 process flow and figure 2 Similar, but the difference is that all the stabilized gasoline from the rectification tower T-105 is used as the first absorbent, and the stable gasoline product is not discharged, and the gas oil is no longer used as the first absorbent after the stable operation.

[0053] Wherein the hydrocarbon-containing tail gas is coking dry gas (the composition is shown in the stream ① in Table 5), the raw material addition rate is 9.75 tons / hour, diesel oil is used as the second absorbent, and the volume ratio of the first absorbent to coking dry gas is 1:3.9 , the consumption of the second absorbent is 12 tons / hour, and the opera...

Embodiment 3

[0055] This embodiment is used to illustrate the treatment method for petrochemical gas containing light hydrocarbons provided by the present invention.

[0056] According to the method of embodiment 2, the petrochemical gas containing light hydrocarbons is processed, and the difference is that the tail gas containing hydrocarbons is a catalytic cracking gas (the composition is shown in Table 6, logistics ①), and the raw material addition is 15.93 tons / hour, taking stable gasoline as The first absorbent, with diesel oil as the second absorbent, the volume ratio of the first absorbent to catalytic cracking gas is 1: 5.2, and the consumption of the second absorbent is 13 tons / hour. The operating parameters in the tower are shown in Table 2. The composition and operating parameters of key logistics streams are shown in Table 6, and the consumption of heat source and cold source is shown in Table 3. Output: carbon two components 2.61t / h; liquefied petroleum gas 8.98t / h, the recove...

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Abstract

The invention provides a method for treating light hydrocarbon-containing petrochemical gas. The light hydrocarbon-containing petrochemical gas contains C2-5 hydrocarbons. The method comprises the following steps of contacting the light hydrocarbon-containing petrochemical gas with a first absorbent so that the content of the C2-5 hydrocarbons is reduced to less than 3% by mole and a first enriched absorption liquid and first lean gas are obtained, carrying out primary desorption separation of the first enriched absorption liquid so that C1 and a lighter component are separated out, and carrying out secondary desorption separation of the materials treated by the primary desorption separation so that a C2 light hydrocarbon fraction is separated out. Based on light hydrocarbon-containing petrochemical gas having C2 component content above 10% by mole, the method realizes a C2 component recovery rate above 65% and a C3-C5 light hydrocarbon fraction recovery rate of 95%. Based on light hydrocarbon-containing petrochemical gas which has C2 component content above 20% by mole and is common in petrochemical companies, the method realizes a C2 component recovery rate above 85% and a C3-C5 light hydrocarbon fraction recovery rate of 95%.

Description

technical field [0001] The invention relates to a treatment method for petrochemical gas containing light hydrocarbons. Background technique [0002] Petrochemical is a very large industrial process, which requires conversion and separation of hundreds of substances to obtain high-value products. In the process of atmospheric and vacuum distillation, catalytic cracking, cracking, coking, catalytic reforming, isomerization and other processes, a large amount of gas will be produced by-product, which contains hydrogen, nitrogen, methane, C2 light hydrocarbons (also known as carbon 2) Light hydrocarbon substances such as liquefied petroleum gas, the total amount of these gases exceeds 5% of the total processed petroleum. Moreover, most of these by-products are part of the raw materials required in the petrochemical process, especially hydrogen, carbon dioxide, and liquefied petroleum gas, which are relatively expensive raw materials needed in the petrochemical production proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/06C07C11/04C07C7/11C10G5/04
Inventor 屠伟龙阮雪华贺高红胡江青杨云峰刘红晶高翔宇
Owner CHINA PETROLEUM & CHEM CORP
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