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Regeneration process for washing and spraying methanol by low-temperature methanol

A low-temperature methanol washing, methanol technology, applied in the preparation of organic compounds, organic chemistry, chemical instruments and methods, etc., can solve the problems of reducing concentration, increasing material consumption and energy consumption in acid gas treatment process, and reducing operation and design pressure. , The effect of reducing equipment investment and consumption

Active Publication Date: 2010-06-16
WISON ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the dissolved CO in the spray methanol and the hydrogel 2 After the gas directly enters the rectification regeneration system, this part of CO 2 Into the acid gas, reducing the H in the acid gas 2 The concentration of S also increases the material consumption and energy consumption of the acid gas treatment process.

Method used

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  • Regeneration process for washing and spraying methanol by low-temperature methanol
  • Regeneration process for washing and spraying methanol by low-temperature methanol
  • Regeneration process for washing and spraying methanol by low-temperature methanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A low-temperature methanol washing and spraying methanol regeneration process adopts single-tower absorption, such as image 3 As shown, the logistics data are all the simulation calculation results of the 900,000 tons / year coal gasification methanol scale plant process.

[0032] Raw gas 21 (390000Nm 3 / h, 313.0K, 5.60MPaA, gas composition H 2 : 46.00%, CO: 21.55%, CO 2 : 31.56%, H 2 S: 0.24%, H 2 O: 0.23%, other 0.42%), spray into methanol 22 (1770Kg / h, 313.0K) and then enter the raw material gas cooler 1, after the raw material gas is cooled, it is sent into the spray methanol and hydrocondensate separation tank 2, after separation The raw material gas 24 (261.0K, 5.56MPaA) is sent to the absorption tower, and the spray methanol and the hydrocondensate 23 (2630Kg / h, 261.0K, 5.56MPaA) are introduced into the flash tank 18, and the flash steam 35 (113Nm 3 / h, 252.3K, 0.8MPaA) into H 2 S concentration tower 12, condensate 34 (2421kg, 252.3K, 0.8MPaA) in methanol an...

Embodiment 2

[0041] A low-temperature methanol washing and spraying methanol regeneration process, using double-tower absorption, such as Figure 4 As shown, the method includes the following steps:

[0042] Methanol 22A and 22B are sprayed into the feed gas 21A and 21B, and then enter the feed gas cooler 1A and 1B. After the feed gas is cooled, it is sent to the spray methanol and hydraulic fluid separation tanks 2A and 2B, and the separated feed gas 24A and 24B are sent to the absorption tower, spray methanol and hydrocondensate 23A and 23B are introduced into the flash tank 18, and the flash gas 35 is sent into the H 2 S concentration tower 12, condensate 34 in methanol and water condensate / H 2 S gas heat exchanger 19 with H 2 H at the outlet of S fraction heat exchanger 9 2 S gas 33 heat exchange, after reheating, the condensate 36 enters the methanol-water separation tower 4, the water in the condensate is output from the bottom of the tower 4, and is treated as the waste liquid 27...

Embodiment 3

[0044] A low-temperature methanol washing and spraying methanol regeneration process, the process includes raw material gas spraying methanol, raw material gas cooling, raw material gas gas-liquid separation, methanol and hydrocondensate flash evaporation, methanol and hydrocondensate reheating, methanol rectification and regeneration , the specific steps of the process are as follows: a stream of raw material gas is sprayed with methanol and condensate, the pressure is 3.0MPa, the temperature is 243K, flashed through the flash tank, the operating pressure of the flash tank is controlled at 0.6MPa, and the condensate is obtained The flash steam temperature is 233K, and the condensate flash steam is sent to a H 2 S concentrating tower, and finally into the tail gas, H 2 The operating temperature of the S concentration tower is controlled at 203-238K, and the temperature of the methanol and water condensate after decompression is 233K, and the H 2 H at the outlet of S fraction ...

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Abstract

The invention relates to a regeneration process for washing and spraying methanol by low-temperature methanol, which comprises the following steps of: spraying the methanol by virgin gas, cooling the virgin gas, carrying out gas-liquid separation on the virgin gas, carrying out flash evaporation on the methanol and a water condensate, reheating the methanol and the water condensate, rectifying and regenerating the methanol, carrying out flash evaporation on the methanol sprayed by the virgin gas and the water condensate by a flash tank, delivering the flashed vapor of the condensate into an H2S concentration tower, delivering into tail gas finally, carrying out heat exchange between the decompressed methanol, the decompressed water condensate and H2S gas at an outlet of an H2S distillate heat exchanger, delivering the reheated methanol and the reheated water condensate into a methanol water knockout tower for separation, delivering methanol gas at the top of the methanol water knockout tower into a methanol regeneration tower and carrying out rectification and regeneration. Compared with the prior art, the invention has the advantages of low energy consumption, low operating pressure of the heat exchanger, high concentration of H2S in acid gas and the like.

Description

technical field [0001] The invention relates to the field of solvent regeneration of a gas absorption device, in particular to a regeneration process for washing and spraying methanol at low temperature. Background technique [0002] The low-temperature methanol washing process has been widely used in gas purification devices such as synthetic ammonia, synthetic methanol and other oxo synthesis, hydrogen production, city gas and natural gas desulfurization. 相关专利有CN1491882(2005),CN1451602(2005),CN1386699(2004),CN1107382(1997),CN1113824(1997),CN1063086(1994),CN88100529(1988),US4609384(1986),CN85107195(1986),US4430316( 1984), US4324567 (1982). The low-temperature methanol washing process is to use methanol to absorb the acid gas in the mixed gas, and then separate the methanol from the acid gas through decompression desorption, air stripping, and heating, so as to purify the mixed gas and recover methanol. [0003] The raw material gas of the low-temperature methanol washing p...

Claims

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Application Information

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IPC IPC(8): C07C31/04C07C29/80
Inventor 叶鑫宫万福吕建宁张栓存李延生辛呈钦
Owner WISON ENG
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