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Method for preparing carbon monoxide (CO) through low-temperature distillation

A carbon monoxide, low-temperature distillation technology, applied in the direction of carbon monoxide, refrigeration and liquefaction, liquefaction, etc., can solve the problems of volume concentration of CO and high yield without mentioning it, and achieve the effects of reducing energy consumption, safe preparation method, and less equipment

Inactive Publication Date: 2012-09-19
SICHUAN TECHAIRS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above-mentioned patents, there is no mention of how to control the preparation process so that the volume concentration of CO produced can reach a higher value; how to control the yield of CO in the raw material gas is relatively high

Method used

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  • Method for preparing carbon monoxide (CO) through low-temperature distillation
  • Method for preparing carbon monoxide (CO) through low-temperature distillation
  • Method for preparing carbon monoxide (CO) through low-temperature distillation

Examples

Experimental program
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Effect test

Embodiment 1

[0025] like figure 1 as shown, figure 1The schematic diagram of the process flow device for preparing CO in this example, the mixed gas in this example contains CO: 81.98%, H 2 : 4.91%, N 2 : 7.57%, Ar: 1.84%, CH 4 : 3.70% (mole percent) industrial tail gas, pressure: 2.4Mpa(G), temperature: normal temperature, flow rate: 192.23kmol / h, through condensation heat exchange, decompression to 1.0Mpa(G) and then enter the cryogenic rectification tower T101 , part of CO and noncondensable gas H 2 , N 2 After exchanging heat with low-temperature liquid nitrogen through the low-temperature rectification tower top heat exchanger E103, part of CO is recovered, and the remaining small amount of low-temperature CO and H 2 , N 2 After exchanging heat with heat exchanger E101 to normal temperature, it is sent out to the boundary area for unified treatment.

[0026] The liquid phase at the bottom of cryogenic distillation tower T101 is mainly CO, Ar and CH 4 , enter the middle part of...

Embodiment 2

[0036] like figure 1 as shown, figure 1 It is a schematic diagram of the process flow device for preparing CO in this embodiment. The mixed gas in this embodiment is industrial tail gas containing CO: 88.68%, H2: 10.02%, CH4: 1.30% (mole percentage), pressure: 1.1Mpa (G), Temperature: normal temperature, flow rate: 223.21kmol / h, through condensation heat exchange, decompression to 0.6Mpa(G) and then enter the cryogenic rectification tower T101, part of CO and non-condensable gas H2 pass through the cryogenic rectification tower top heat exchanger E103 and After the low-temperature liquid nitrogen heat exchange, part of the CO is recovered, and the remaining small amount of low-temperature CO and H2 are exchanged with the heat exchanger E101 to normal temperature and then sent out to the boundary area for unified treatment.

[0037] The liquid phase at the bottom of the cryogenic rectification tower T101 is mainly CO and a small amount of CH4, which enters the middle part of t...

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Abstract

The invention relates to a method for preparing carbon monoxide (CO) through low-temperature distillation. The method comprises the steps that after mixed gas which at least contains hydrogen, CO and methane is cooled and partially condensed and expanded, the gas enters a low-temperature rectifying tower; a gas phase in the low-temperature rectifying tower comes out from the top of the low-temperature rectifying tower, exchanges heat with a heat exchanger and then is delivered to the outside of a device for uniform treatment; a condensed liquid phase in the low-temperature rectifying tower exchanges heat with a heat exchanger at the bottom of the low-temperature rectifying tower, enters the middle part of a purifying tower from the bottom of the low-temperature rectifying tower under the condition of reduced pressure, exchanges heat with a heat exchanger at the bottom of the purifying tower and is gasified to obtain high-concentration CO gas; after the high-concentration CO gas comes out form the top of the purifying tower and exchanges heat with a heat exchanger, the high-concentration CO gas is used as high-concentration CO products to be delivered out of the device; and after being subjected to pressure reduction and heat exchange, a condensed liquid phase in the purifying tower is delivered to the outside of the device for uniform treatment. According to the preparation method provided by the invention, since raw gas and intermediate gas for preparing CO do no pass through dynamic equipment, the leakage factor of hazardous toxic gas is precluded and the preparation method is safer; and since the concentration and the yield of the CO products prepared by adopting the preparation method are high, the industrial application is facilitated.

Description

technical field [0001] The invention relates to a method for preparing carbon monoxide by low-temperature distillation. Background technique [0002] Carbon monoxide is usually separated from synthesis gas produced by catalytic conversion or partial oxidation of natural gas, petroleum, coal or other hydrocarbons. In addition to carbon monoxide, there are often hydrogen, nitrogen, methane and argon in the gas. These impurity components often limit the use of carbon monoxide, so that many mixed gases containing a large amount of carbon monoxide can only be burned and emptied, resulting in a waste of resources. [0003] At present, there are mainly four types of separation of carbon monoxide: the first type is the use of the Cosorb method, which uses a complex solution to selectively absorb carbon monoxide, and then obtains carbon monoxide products through heating and analysis. Because some components in the raw material gas will react with the complex solvent, Its ability to...

Claims

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Application Information

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IPC IPC(8): C01B31/18C01B32/40
CPCF25J3/0223F25J3/0233F25J3/0261F25J3/08F25J2200/04F25J2200/40F25J2200/74F25J2215/14F25J2270/12F25J2270/14F25J2270/42
Inventor 钟娅玲曾启明钟雨明陈天洪牟树荣
Owner SICHUAN TECHAIRS
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