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Isotope low-temperature rectifying device

A low-temperature rectification and isotope technology, which is applied in the field of low-temperature rectification devices, can solve the problems of difficult to satisfy the thermal insulation effect, large amount of thermal insulation materials, poor equipment reliability, etc., and achieves light weight, large equipment weight and low material cost. Effect

Active Publication Date: 2013-03-20
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology has the following disadvantages: the thermal insulation effect is still difficult to meet the requirements of isotope separation by low-temperature rectification, the amount of thermal insulation material is large, the pearlescent sand needs to be removed during maintenance, and the thermal insulation layer is prone to loosening under long-term or low temperature conditions. Many small-diameter rectification columns are arranged side by side to form a multi-tubular tower structure, which causes manufacturing difficulties, low production capacity, and poor equipment reliability

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0033] Cryogenic rectification device for CO cryogenic distillation separation 13 C isotope. The low-temperature rectification device is composed of a condenser 2, a rectification column 6, a reboiler 8, an aluminum foil radiation layer 5, a low-temperature gas cold screen 11, and a vacuum housing 7. A vacuum exhaust port 9 is provided on one side of the vacuum housing 7, see image 3 . The coolant 3 is liquid nitrogen, and the rectifying medium is CO. In the cryogenic rectification tower, the CO vapor-liquid two-phase mass transfer exchange occurs on the surface of the wire mesh corrugated packing in the rectification column 6, containing heavy isotopes 13 The components of C are enriched in the liquid phase and flow to the bottom of the tower; while the components containing light isotopes 12The components of C are enriched in the gas phase and rise to the top of the tower. So through multiple gas-liquid exchanges, in the reboiler 8 13 C is enriched, while the light iso...

Embodiment 2

[0035] Cryogenic rectification unit for CH 4 Cryogenic distillation separation 13 C isotope. The cryogenic rectification device is composed of a condenser 2, a rectification column 6, a reboiler 8, an aluminum foil radiation layer 5, and a vacuum shell 7, and a vacuum port 9 is provided on one side of the vacuum shell 7, see figure 2 . The cryogenic coolant 3 is liquid nitrogen, and the rectifying medium is CH 4 . CH in the cryogenic distillation column 4 The gas-liquid two-phase mass transfer and exchange on the surface of the Dixon ring packing 4 in the rectification column 6, containing heavy isotopes 13 The components of C are enriched in the liquid phase and flow to the bottom of the tower; while the components containing light isotopes 12 The components of C are enriched in the gas phase and rise to the top of the tower. So through multiple gas-liquid exchanges, in the reboiler 8 13 C is enriched, while the light isotopes in the overhead condenser 2 12 C is enr...

Embodiment 3

[0037] Cryogenic rectification unit for O 2 Separation of isotopes by cryogenic rectification 18 O. The low-temperature rectification device is composed of a condenser 2, a rectification column 6, a reboiler 8, an aluminum foil radiation layer 5, a low-temperature gas cold screen 11, and a vacuum housing 7. A vacuum exhaust port 9 is provided on one side of the vacuum housing 7, see Figure 4 . The cryogenic coolant 3 is liquid nitrogen, and the rectification medium is high-purity O 2 . In the cryogenic distillation column O 2 Vapor-liquid two-phase triangular or rectangular ring particle packing surface for mass transfer, containing heavy isotopes 18 The components of O are enriched in the liquid phase and flow to the bottom of the tower; while the components containing light isotopes 16 The components of O are enriched in the gas phase and rise to the top of the tower. So through multiple gas-liquid exchanges, in the reboiler 8 18 O is enriched, while the light isoto...

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Abstract

The invention relates to an isotope low-temperature rectifying device. The isotope low-temperature rectifying device comprises a condenser, a rectifying column, a reboiler, an aluminum foil radiating layer, a low-temperature gas cold shield and a vacuum shell, wherein the condenser is arranged at the top of the rectifying column; the reboiler is arranged at the bottom of the rectifying column; the aluminum foil radiating layer is wrapped out of a tower wall of the rectifying column; the low-temperature gas cold shield is wound on the external surface of the aluminum foil radiating layer out of the tower wall of the rectifying column; and the condenser, the rectifying column, the reboiler, the aluminum foil radiating layer and the low-temperature gas cold shield are arranged in the vacuum shell. Compared with the prior art, the isotope low-temperature rectifying device has a simple structure and eliminates amplification effect as a tower diameter is amplified and vertical cascade connection is formed by the rectifying columns filled with a structured packing and having different diameters, and is applied in the field of low-temperature rectification, particularly to isotope separation of 13C, 18O, 15N, 10B, 2H, 3He and 22Ne by the low-temperature rectification.

Description

technical field [0001] The invention relates to a low-temperature rectification device in the chemical industry, in particular to an isotope low-temperature rectification device. Background technique [0002] Cryogenic rectification devices are widely used in the industrial field. In the prior art, the cryogenic rectification towers are all insulated with pearlescent sand. The thermal insulation performance of pearlite is better than that of early polyurethane materials, and it has been widely used in the field of low temperature air separation. However, in the field of isotope separation, there are many defects in the cryogenic rectification tower using pearlite sand insulation. Low separation coefficient of isotope system, such as CO cryogenic distillation separation 13 C 12 CO / 13 The separation coefficient of CO is 1.008-1.01, so if we want to 13 CO enrichment to 99% 13 CO generally requires 2,000 to 3,000 theoretical plates, which leads to the height of the isotop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D59/04B01D3/16
CPCF25J2290/30F25J2220/90F25J3/08F25J2215/50F25J2215/42F25J2215/30F25J2215/32F25J2215/10
Inventor 李虎林袁家均李良君许保云龙磊吉永喆
Owner SHANGHAI RES INST OF CHEM IND
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