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Carbonyl synthesis gallop gas-releasing recovery method

A recovery method, oxo synthesis technology, applied in the field of recovery of propylene, propane and butyraldehyde, which can solve the problems of complex process, poor economy and difficult application

Active Publication Date: 2007-11-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are research reports abroad using pressure swing or temperature swing adsorption separation. Due to the complexity of the process, it is difficult to apply. Another technology uses the intermediate product or catalyst solution in the carbonylation process as the absorption-temperature-rising desorption process. During the desorption process, the amount of butyraldehyde lost with propane is large, and propane containing butyraldehyde can only be used as fuel, and the economy is not good

Method used

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  • Carbonyl synthesis gallop gas-releasing recovery method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The purge gas from the oxo unit (same composition as Table 1) is in reverse phase contact with the absorbent butanol in the absorption tower T1, propylene propane and butyraldehyde are dissolved in the absorbent butanol, discharged from the bottom of the tower, and enter the rectification tower T2, the absorption exhaust gas is discharged from the top of the tower into the fuel pipe network. In the rectification tower T2, the mixed gas of propylene and propane is steamed from the top of the tower, and enters the rectification tower T3 after being compressed, and the absorbent is discharged from the bottom for recycling. In the rectification tower T3, propylene is obtained from the top of the tower and propane is obtained from the bottom of the tower through rectification separation. The operating condition of T1 is: P=1.4Mpa, T=30 ℃, the consumption of absorbent is 5.0L / Nm Relax gas; The operating condition of T2 is: P=2.0Mpa, tower top T=30 ℃, tower bottom T =180°C; t...

Embodiment 2

[0015] The purge gas from the oxo unit (the composition is the same as in Table 1) is in reverse phase contact with the absorbent octane in the absorption tower T1, propylene propane and butyraldehyde are dissolved in the absorbent octane, and discharged from the bottom of the tower into the rectification tower T2 , the exhaust gas is discharged from the top of the tower into the fuel pipe network. In the rectification tower T2, the mixed gas of propylene and propane is steamed from the top of the tower, and enters the rectification tower T3 after being compressed, and the absorbent is discharged from the bottom for recycling. In the rectification tower T3, propylene is obtained from the top of the tower and propane is obtained from the bottom of the tower through rectification separation. The operating condition of T1 is: P=1.3Mpa, T=35 ℃, the consumption of absorbent is 4.0L / Nm Relax gas; The operating condition of T2 is: P=0.7Mpa, tower top T=7 ℃, tower bottom T =180°C; th...

Embodiment 3

[0018] The purge gas from the oxo unit (the composition is the same as in Table 1) is mixed with absorbent C in the absorption tower T1 12 Alkanes are in reverse phase contact, propylene propane and butyraldehyde are dissolved in the absorbent octane, discharged from the bottom of the tower into the rectification tower T2, and the exhaust gas is discharged from the top of the tower into the fuel pipe network. In the rectification tower T2, the mixed gas of propylene and propane is steamed from the top of the tower, and enters the rectification tower T3 after being compressed, and the absorbent is discharged from the bottom for recycling. In the rectification tower T3, propylene is obtained from the top of the tower and propane is obtained from the bottom of the tower through rectification separation. The operating condition of T1 is: P=1.0Mpa, T=65 ℃, the consumption of absorbent is 8.5L / Nm Relax gas; The operating condition of T2 is: P=2.7Mpa, tower top T=40 ℃, tower bottom T...

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Abstract

The present invention is absorption-rectification-rectification process for recovering propylene, propane and butyl aldehyde from the discharged gas from oxo process. The absorption-rectification-rectification process includes the absorption with absorbent of C6-C12 hydrocarbon and C4-C10 alcohol from the reversely contact gas inside an absorbing tower at the operation conditions of 20-65 deg.c and 1.0-1.8 MPa; the rectification of the absorbed liquid in a rectification tower to separate propylene and propane from the absorbent and obtain C3 mixture in the tower top at the operation conditions of 0.5-2.5 MPa pressure, 5-40 deg.c top temperature and 120-190 deg.c bottom temperature; and the rectification of C3 mixture in a rectification tower to obtain propylene and propane product at the operation conditions of 0.4-2.5 MPa and 0-40 deg.c tower top temperature. The process has CO eliminating rate of 98 %, aldehyde eliminating rate of 99 % and inert gas eliminating rate over 95 %.

Description

[0001] Field: [0002] The invention relates to a method for recovering propylene, propane and butyraldehyde from oxo synthesis purge gas by adopting an absorption-rectification-rectification process. Background technique: [0003] The oxo-synthesis reaction system of the butanol production unit uses propylene and synthesis gas as raw materials to generate n-butyraldehyde and isobutyraldehyde, and at the same time, a small amount of propylene is converted into propane. In order to prevent the accumulation of inert components such as propane, it is necessary to have a part of the gas (relaxed gas for short) to be continuously discharged from the circulation loop of the system, which contains 23.3% (mol) of propylene, 29.5% (mol) of propane, and 2.1% of butyraldehyde ( mol), due to its complex composition, it can only be burned as fuel, and the waste of resources is very huge, which affects the economic benefits of enterprises. [0004] For the recovery technology of oxo-synthe...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D3/16C07C7/00C07C7/11C07C7/04C07C9/08C07C11/06C07C47/02
Inventor 王路海姜道华赵锡武马建英赵庆龙袁宗胜杨春吉杨玉和王刚吴林美
Owner PETROCHINA CO LTD
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