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Process for recovery of acidic gases by methanol absorption

An acid gas and process technology, applied in the separation of dispersed particles, hydrogen separation, reagents, etc., can solve the problems of increased investment and operating costs, and achieve the effect of improving the recovery rate and saving investment and operating costs.

Inactive Publication Date: 2005-05-25
SINOPEC NINGBO ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that it is necessary to add a compressor, which greatly increases the investment and operating costs.

Method used

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  • Process for recovery of acidic gases by methanol absorption

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Embodiment Construction

[0014] Below by embodiment the present invention is described in further detail, but the present invention is not limited to embodiment:

[0015] Accompanying drawing 1 is a kind of low-temperature methanol washing process of the present invention, and the temperature of feed gas (3) is 40 ℃, and pressure is 4.9MPa (A), and flow rate is 132569Nm 3 / h, after cooling and separating the condensate, the gas (4) is sent to CO 2 The absorption tower (1) uses the circulating methanol (5) in the circulation section, from CO 2 The semi-lean methanol (6) in the V section of the regeneration tower (2) and the lean methanol (7) from the boundary area are washed and purified, and the CO 2 The methanol-rich bottom of the absorption tower (1) is divided into two streams, one stream of methanol-rich stream (5) is cooled and sent back to the bottom of the tower; the other stream of methanol-rich stream (8) is sent to the CO after cooling 2 Regenerative tower (2) section I flashes, and the ef...

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Abstract

A process for recovering acidic gas CO2 by methanol absorption includes absorbing CO2 with methanol, reducing pressure, desorption to separate out CO2, vacuumizing, desorption to separate out CO2 further, stripping, and heating to separate out CO2. Its advantages are high recovery yield and purity of CO2, and low cost.

Description

technical field [0001] The invention relates to the field of mixed gas purification, especially the use of methanol to absorb and recover CO in mixed gas 2 gas craft. Background technique [0002] The low-temperature methanol washing process is widely used in the production of synthetic ammonia, city gas, industrial hydrogen, synthetic methanol or other carbon chemical devices using coal (petroleum coke) or residual oil as raw materials. Related patents are 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 from acid gas to achieve the purpose of separation and recovery. [0003] The deficiency of prior art is that most of CO is separated and recovered from methanol solution by vacuum desorption. 2 After that, N 2 Gas stripping further removes CO 2 , and finally the CO in the stripped gas 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14C01B3/50
CPCY02C20/40Y02P20/151
Inventor 亢万忠李晓黎汪建平辛秉政李永经狄伯钧章晨晖赵方平邹杰王沛淮张炳国李少卿
Owner SINOPEC NINGBO ENG