Pyrolysis gas separation system with cooling capacity recovery function and separation method thereof

A separation system and cold energy recovery technology, used in absorption purification/separation, hydrocarbon purification/separation, chemical instruments and methods, etc., can solve the problems of low investment recovery rate, large investment in cracking gas separation process, and large investment.

Active Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter what kind of separation process is used, if the rectification method is used to separate light components such as methane, it is necessary to use a cold box to provide a lower cooling capacity, which requires a large investment and high energy consumption.
In addition, to obtain polymer-grade ethylene products and polymer-grade propylene products, the number of required equipment and energy consumption are relatively large
[0005] For

Method used

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  • Pyrolysis gas separation system with cooling capacity recovery function and separation method thereof
  • Pyrolysis gas separation system with cooling capacity recovery function and separation method thereof
  • Pyrolysis gas separation system with cooling capacity recovery function and separation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] like figure 1 Shown, a kind of cracking gas separation system comprises: compressor (compressor front section 1-1, compressor compressor rear section 1-2); Purification system 2; Gas-liquid separation tank 3; Absorption tower 4; Desorption tower 5 ; Deweighting tower 6; Carbon two hydrogenation reactor 10; Refrigeration recovery system 9.

[0072] After the compressor section is connected to the purification system 2, it is connected to the rear section 1-2 of the compressor. The outlet of the rear section 1-2 of the compressor is connected to the cooler and then connected to the gas-liquid separation tank 3. The gas phase is connected to the middle of the absorption tower 4, and the liquid phase is connected to the separation tank 3. The middle part of heavy tower 6. The bottom of the absorption tower 4 is connected to the desorption tower 5; the top of the desorption tower 5 is connected to the carbon dioxide hydrogenation reactor 10; the bottom of the tower is conne...

Embodiment 2

[0093] A cracked gas separation system is the same as that of Embodiment 1, the only difference being that this embodiment does not have an absorbent replenishment pipeline.

[0094] The incoming amount of cracked gas is 42000kg / h. Propane was chosen as the absorbent.

[0095] The steps that the separation method of described a kind of cracking gas comprises are identical with embodiment 1, and cracking gas input composition is also identical.

[0096] The composition of the obtained crude ethylene product is shown in Table 4.

[0097] Table 4 crude ethylene product composition

[0098] composition mol% hydrogen 0.6 methane 15.4 Vinyl 74.9 ethane 8.9 Propylene 0.2

[0099] The mass composition of other streams is shown in Table 5.

[0100] Table 5 Quality composition of different streams

[0101]

[0102]

[0103] In this example, the ethylene recovery rate was 99.0%.

Embodiment 3

[0105] use as figure 2 A kind of pyrolysis gas separation system shown comprises: compressor (compressor front section 1-1, compressor rear section 1-2); Purification system 2; Gas-liquid separation tank 3; Absorption tower 4; Desorption tower 5; Heavy tower 6; Depropanizer 7; Propylene rectification tower 8; Cooling recovery system 9; C2 hydrogenation reactor 10; C3 hydrogenation reactor 11.

[0106] After the compressor section is connected to the purification system 2, it is connected to the rear section 1-2 of the compressor. The outlet of the rear section 1-2 of the compressor is connected to the cooler and then connected to the gas-liquid separation tank 3. The gas phase is connected to the middle of the absorption tower 4, and the liquid phase is connected to the separation tank 3. The middle part of heavy tower 6. The bottom of the absorption tower 4 is connected to the desorption tower 5; the top of the desorption tower 5 is connected to the carbon dioxide hydrogena...

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Abstract

The invention discloses a pyrolysis gas separation system with a cooling capacity recovery function and a separation method thereof. The separation system comprises a compressor, a purification system, a cooler, a gas-liquid separation tank, an absorption tower, a desorption tower, a heavy component removal tower, a cold energy recovery system and a C2 hydrogenation reactor, the compressor sections are connected with the purification system and then connected with a compressor rear section; a rear-section outlet of the compressor is connected with the cooler and then connected with the gas-liquid separation tank, a gas-phase outlet of the separation tank is connected with the absorption tower, and a liquid-phase outlet of the separation tank is connected with the de-heavy tower; the top of the absorption tower is connected with a cooling capacity recovery system; the bottom of the absorption tower is connected with the desorption tower; crude ethylene gas is extracted from the top of the desorption tower; the desorption tower kettle is connected with the upper part of the absorption tower; and a heavy component removal tower top pipeline is combined with a desorption tower top pipeline and then is connected with the C2 hydrogenation reactor. The system and the method have the characteristics of low investment, low energy consumption and remarkable benefit.

Description

technical field [0001] The invention relates to the technical field of cracking and separation, and furthermore, relates to a cracking gas separation system and a separation method with cooling capacity recovery. Background technique [0002] A large amount of tail gas will be produced in the process of oil refining and chemical production, some of which, such as tail gas produced by catalytic cracking, thermal cracking, delayed coking, hydrocracking and other production processes, contain a lot of carbon 2 and carbon 3 components, especially some tail gas In , the ethane / propane content is relatively high. At present, the C2C3 concentrated gas recovered from the tail gas of the refinery is mainly sent to different sections of the ethylene plant to increase the production of ethylene propylene. However, for refineries without ethylene production facilities nearby, the concentrated gas The whereabouts is a major problem, resulting in the C2C3 resources in the dry gas not bei...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/04C07C7/163C07C7/167C07C7/11C07C11/04C07C11/06C07C5/03
CPCC07C7/005C07C7/04C07C7/163C07C7/167C07C7/11C07C5/03C07C11/04C07C11/06C07C9/08Y02P20/50Y02P20/10
Inventor 罗淑娟李琰李东风田峻叶杰铭刘智信
Owner CHINA PETROLEUM & CHEM CORP
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