Method for coproducing or singly producing food grade carbon dioxide and industrial grade carbon dioxide by utilizing industrial waste gas

A carbon dioxide and industrial waste gas technology, applied in chemical instruments and methods, chemical industry, inorganic chemistry, etc., can solve the problems of increased equipment manufacturing investment, large demand, and increased venting volume, and achieve reduced equipment investment and good product quality , the effect of small empty volume

Active Publication Date: 2009-09-23
重庆川茂化工科技有限公司
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AI Technical Summary

Problems solved by technology

[0007] (1) Single product
The existing devices are either all food-grade or all industrial-grade. Food-grade products have higher costs and higher market prices due to the addition of more purification steps such as dehydrogenation, but the demand is small, while the price of industrial grade is low. The demand is large, therefore, it is difficult for a single product to meet the market demand
[0008] (2) Most of the current processes use a one-step low-temperature distillation purification process
For gas sources with a carbon dioxide content of ≤90%, due to the increase in system pressure, equipment manufacturing investment will increase exponentially; at the same time, the venting volume will increase and the recovery rate of carbon dioxide will decrease

Method used

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  • Method for coproducing or singly producing food grade carbon dioxide and industrial grade carbon dioxide by utilizing industrial waste gas
  • Method for coproducing or singly producing food grade carbon dioxide and industrial grade carbon dioxide by utilizing industrial waste gas

Examples

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Effect test

Embodiment 1

[0039] Pressure swing adsorption decarbonization and air release in a factory: total 3500Nm 3 / h, composed of CO 2 : 81.5%, H 2 : 6.2%, N 2 : 9%, O 2 : 1.5%, other impurities such as S and hydrocarbons: 1.8%. Its process is as figure 1 As shown: the exhaust gas is compressed to 4.0MPa by the second-stage compressor, and the exhaust gas is extracted from the compressor section with a pressure of ≤3.0MPa for pre-desulfurization, and the inorganic sulfur in the exhaust gas is removed, and then enters the compressor for compression. The waste gas from the compressor is dehydrolyzed, refined and desulfurized, and the organic sulfur and residual inorganic sulfur are removed, and then it enters the freeze dryer, and is dried to the industrial grade product standard (water content ≤ 20ppm) and then enters the CO 2 On the tube side of the evaporator, the heat exchange with the liquid carbon dioxide on the shell side is partially condensed, and the condensing temperature is about -...

Embodiment 2

[0041] A factory vented exhaust gas, with a total amount of 5200Nm 3 / h, CO 2 The content is 62.3%, the rest is H 2 , N 2 , O 2 , hydrocarbons and trace amounts of impurities such as S. Its process is as figure 2 As shown in the figure, the exhaust gas is compressed to 6.0MPa by four-stage compression, extracted from the first-stage outlet for pre-desulfurization, and the inorganic sulfur in the exhaust gas is removed, and then enters the compressor from the second-stage inlet for compression, and then is extracted from the third-stage outlet for fine desulfurization. Remove organic sulfur and residual inorganic sulfur, and then enter the compressor from the fourth-stage inlet for compression. The exhaust gas with a pressure of 6.0MPa from the fourth stage of the compressor enters the cold dryer, and then enters the CO after drying. 2 On the tube side of the evaporator, the heat exchange with the liquid carbon dioxide on the shell side is partially condensed, and the co...

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Abstract

The invention discloses a method for coproducing or singly producing food grade carbon dioxide and industrial grade carbon dioxide by utilizing industrial waste gas. The method takes industrial waste gas as raw material, and adopts two-step process of separation and purification; first, the feed gas is treated with primary purification, primary drying, primary condensation and primary extraction in sequence at 3.0 to 6.5 MPa by taking the quality of industrial products as an objective; and then part of or all the gas enters an industrial grade product storage tank, and the balance is decompressed to 1.8 to 3.5 MPa and treated with secondary purification, secondary drying, secondary condensation and liquefaction in sequence by taking the quality of food grade products as an objective; subsequently, secondary extraction is conducted to obtain the food grade carbon dioxide products. The invention adopts two-grade extraction process and a set of apparatus to coproduce or singly produce food grade carbon dioxide and industrial grade carbon dioxide, and can adjust the proportion between the food grade products and the industrial grade products in accordance with requirements; the invention also has the advantages of wide range of feed gas application, investment saving, low energy consumption, high recovery rate of carbon dioxide, excellent quality of products, safe and stable operation of the apparatus, and the like.

Description

technical field [0001] The invention relates to a method for separating carbon dioxide, in particular to a method for co-producing or producing food-grade and industrial-grade carbon dioxide per unit by utilizing industrial waste gas. Background technique [0002] With the growth of the world's population and the development of industrial production, the greenhouse gases entering the atmosphere are increasing, and their impact on the environment has attracted widespread attention from the international community. As the main greenhouse gas component, carbon dioxide recovery from industrial waste gas has very important social significance in protecting the environment, responding to the country's call for energy conservation and emission reduction, and realizing the sustainable development of human society. At the same time, because liquid carbon dioxide has a very wide range of uses, using industrial waste gas to produce liquid carbon dioxide, turning waste into treasure, ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/20C01B32/50
CPCY02P20/10
Inventor 田南文斌洁
Owner 重庆川茂化工科技有限公司
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