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Technological method for co-producing industrial-grade carbon dioxide and food-grade carbon dioxide through heat pump rectification

A carbon dioxide and heat pump rectification technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problem of high energy consumption, achieve the effect of reducing energy consumption and adjusting production energy consumption

Active Publication Date: 2012-11-07
HENAN XINLIANXIN SHENLENG ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of food-grade carbon dioxide needs to liquefy the raw material gas twice, which consumes a lot of energy

Method used

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  • Technological method for co-producing industrial-grade carbon dioxide and food-grade carbon dioxide through heat pump rectification

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Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment is a normal production condition. To produce 10 tons of industrial-grade carbon dioxide and 2.5 tons of food-grade carbon dioxide requires a total of 10,000 cubic meters of raw gas.

[0031] 1. The raw material gas of 10,000 cubic meters is precooled and dehydrated in the first precooling and dehydration section and then enters the four-stage compression section. The pressure of the raw material gas after the four-stage compression section is 2.5 MPa;

[0032] 2. The raw material gas compressed in step 1 is sequentially passed through a rough desulfurization section, a hydrolysis section and a fine desulfurization section, so that the sulfur content in the raw material gas is reduced to 0.09ppm;

[0033] 3. Pass the raw material gas desulfurized in step 2 through the second pre-cooling and dehydration section and discharge the cooling water to lower the temperature of the raw material gas to 4°C;

[0034] 4. The raw material gas after the second pre-cool...

Embodiment 2

[0041] To produce 5 tons of industrial-grade carbon dioxide and 1.2 hours of food-grade carbon dioxide requires a total of 5,000 cubic meters of raw gas.

[0042] 1. The raw material gas of 5000 cubic meters is precooled and dehydrated in the first precooling and dehydration section and then enters the four-stage compression section. The pressure of the raw material gas after passing through the four-stage compression section is 3.0 MPa;

[0043] 2. The raw material gas compressed in step 1 is sequentially passed through a rough desulfurization section, a hydrolysis section and a fine desulfurization section, so that the sulfur content in the raw material gas is reduced to 0.05ppm;

[0044] 3. Pass the raw material gas desulfurized in step 2 through the second pre-cooling and dehydration section and discharge the cooling water to lower the temperature of the raw material gas to 5.5°C;

[0045] 4. The raw material gas after the second pre-cooling and dehydration section is passed...

Embodiment 3

[0052] To produce 3 tons of industrial-grade carbon dioxide, a total of 2,500 cubic meters of raw material gas is required.

[0053] 1. The raw material gas of 2500 cubic meters is precooled and dehydrated in the first precooling and dehydration section and then enters the four-stage compression section. The pressure of the raw material gas after the four-stage compression section is 3.5 MPa;

[0054] 2. The raw material gas compressed in step 1 is sequentially passed through a rough desulfurization section, a hydrolysis section and a fine desulfurization section, so that the sulfur content in the raw material gas is reduced to 0.01ppm;

[0055] 3. Pass the raw material gas desulfurized in step 2 through the second pre-cooling and dehydration section and discharge the cooling water to lower the temperature of the raw material gas to 7°C;

[0056] 4. Pass the raw material gas after the second pre-cooling and dehydration section through the drying section, so that the water cont...

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Abstract

The invention belongs to a linkage method for co-producing industrial-grade and good-grade liquid carbon dioxide and particularly relates to a technological method for co-producing industrial-grade carbon dioxide and food-grade carbon dioxide through heat pump rectification. The technological method can achieve adjustable production of the food-grade carbon dioxide and can reduce energy consumption and includes the following steps: feed gas passes through a first pre-cooling dehydration working section, a four-level compression working section, a rough desulfuration working section, a hydrolysis working section, a fine desulfuration working section, a second pre-cooling dehydration working section, a drying working section, an industrial-grade liquefaction working section, an industrial-grade rectification working section, an industrial-grade liquefaction working section, a food-grade secondary compression working section, a shell range of a pre-heating working section, an electric-heating device, a dealkylation working section, a pipe range of the pre-heating working section, a tabulation type water cooling working section, a food-grade pre-cooling working section, a food-grade drying working section, a food-grade liquefaction working section, a food-grade rectification working section, a food-grade over-cooling working section and a food-grade carbon dioxide storing tank, then the food-grade liquid carbon dioxide can be obtained. The linkage method has the advantages of being capable of achieving adjustable production of the food-grade carbon dioxide and reducing energy consumption.

Description

technical field [0001] The invention belongs to a co-production method of industrial-grade and food-grade liquid carbon dioxide, and specifically relates to a process method for co-producing industrial-grade and food-grade carbon dioxide by adopting heat pump rectification, which can realize adjustable production of food-grade carbon dioxide and reduce energy consumption. Background technique [0002] In ammonia synthesis enterprises, the carbon dioxide content in the decarbonized air is generally between 70%-90%, and most of the other gas components are nitrogen. In the current carbon dioxide capture technology, the low-temperature method is generally used to capture the raw material gas Carbon dioxide liquefaction and rectification to obtain industrial-grade liquid carbon dioxide with a purity of more than 99.9%. In addition to the purity requirement of more than 99.99%, food-grade carbon dioxide also has strict requirements on more than 20 components such as hydrocarbons....

Claims

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Application Information

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IPC IPC(8): C01B31/20C01B32/50
CPCY02P20/129
Inventor 周永军闫红伟
Owner HENAN XINLIANXIN SHENLENG ENERGY
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