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Low temperature methanol cleaning process

A process, methanol technology, which is applied in the field of methanol absorption and recovery of acid gas in mixed gas, which can solve the problems of reduced desorption amount, increase of system temperature, and reduced desorption refrigeration effect, so as to reduce production costs, reduce consumption, and improve economic benefits Effect

Inactive Publication Date: 2004-04-28
CHINA PETROCHEMICAL CORP
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Problems solved by technology

[0003] The prior art has the following deficiencies: when the raw material is changed from heavy raw material such as coal or residual oil to light raw material such as natural gas, methanol washes the CO in the raw gas. 2 The content drops more, so that the CO 2 The amount of desorption is reduced, thereby reducing the CO 2 The desorption refrigeration effect causes the temperature of the system to rise and the device cannot operate normally

Method used

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Embodiment

[0013] Accompanying drawing 2 is a kind of low-temperature methanol washing process of the present invention, and the temperature of feed gas (5) is 40 ℃, and pressure is 4.9MPa (A), and flow rate is 124450Nm 3 / h is cooled to about -27°C by the ammonia cooler (1) and the ammonia cooler (17), the condensate is separated, and the gas (6) is sent to CO 2 The absorption tower (2) uses the circulating methanol (7) of the circulation section, from the CO 2 The semi-lean methanol (8) in the V section of the regeneration tower (3) and the lean methanol (9) from the boundary area are washed and purified, and the methanol-rich solution at the bottom of the tower is divided into two streams, and one stream of methanol-rich solution (7) passes through the ammonia cooler ( 20) and the propylene cryocooler (18) are cooled to about -35°C and sent back to the bottom of the tower, and another stream of methanol-rich solution (10) is sent into the CO 2 Regeneration tower (3) section I flashes...

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Abstract

The process of absorbing and recovering acid gas, especially CO2 or CO2 and H2S, in gas mixture with methane includes methane absorption of acid gas, desorption of rich-methane solution, gas stripping, heating to separate acid gas. The process features that propylene chiller or vacuum ammonia chiller is increased before the system ammonia cooler to increase cold replenishing amount to the system so as to solve the problem of lowered methane cooling effect and system temperature raise during desorption caused by decreased CO2 content. The said low temperature methanol washing process is suitable for gas purifying device with light material and / or heavy material.

Description

technical field [0001] The invention relates to the field of purification of mixed gas, in particular to a process for absorbing and recovering acid gas in mixed gas with methanol. Background technique [0002] The low-temperature methanol washing process is widely used in devices that use coal (petroleum coke) or residual oil as raw materials to produce synthetic ammonia, city gas, industrial hydrogen, synthetic methanol or other one-carbon chemicals. Related patents have US4050909 (1977), US4609389 (1986). The process is to use methanol to absorb the acid gas in the mixed gas, usually CO 2 or CO 2 and H 2 S, and then through decompression desorption, gas stripping and heating to separate methanol and acid gas to achieve the purpose of separation and recovery. The absorption capacity of methanol to acid gas decreases with the increase of temperature. In order to improve the absorption capacity of methanol to acid gas and reduce the amount of solvent circulation, it is ...

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Application Information

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IPC IPC(8): B01D53/00C01B3/52F25J3/00
Inventor 亢万忠狄伯钧李晓黎章晨晖邹杰
Owner CHINA PETROCHEMICAL CORP
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