Split Heat Pump Distillation Based on Two‐Stage Compression for Separating an Acetone‐Water Mixture

Yang, De‐Ming; Li, Ming; Lou, Chao; Wan, Dehao; Yun, Yi

doi:10.1002/ceat.202100289

Cited by 3 publications

References 19 publications

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Reduction of CO2 emissions by recycling low-potential heat from the Benfield CO2 removal process at a natural gas hydrogen production plant

Hajduga,

Chmielarz,

Bugdol

2024

Clean Techn Environ Policy

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The EU policies related to CO2 emission strictly define the stages of carbon neutrality achieving. According to these regulations, all production installations that emit carbon dioxide will be charged additional emission fees from 2026 to fully in 2035. Analysis of the increasing emission fees shows that in some industries incurring such additional costs will result in a lack of profitability of the products. Industries directly related to the food sector, such as nitrogen fertiliser production, are strategic in the economies of all countries. Nitrogen fertilisers are produced from ammonia, which is synthesised on a large scale from hydrogen and nitrogen. Hydrogen is produced by natural gas reforming with water vapour resulting in syngas (mixture of H2, CO, CO2, H2O), which CO in the next step reacts with water vapour (water gas shift reaction) producing H2 and CO2. CO2 is separated from hydrogen using the Benfield method. The analysis of the Benfield process (one process of hydrogen production) shows a possible way to reduce CO2 emission by optimising heat balance. It was shown that in the proposed technology the heat recovery reaches 89%, while the level below 30% was reported for other available technologies. The proposed solution is based on recirculation and reuse of heat, which is lost in other technologies. The analysis is for a process balance in a medium-sized hydrogen production installation. The analysis considers also the correlations with other installations thermally linked to hydrogen production. The economic balance showed the great financial benefits of this solution. In the scenario discussed, the CO2 emission factor was reduced by 20%. Graphical Abstract

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Reduction of CO2 emissions by recycling low-potential heat from the Benfield CO2 removal process at a natural gas hydrogen production plant

Hajduga,

Chmielarz,

Bugdol

2024

Clean Techn Environ Policy

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Systematic study of energy-saving bioethanol distillation process with sidestreams: Design and control

Zhang,

He,

Yang

et al. 2023

Energy Conversion and Management

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Reduction of CO 2 emissions by recycling low-potential heat from the Benfield CO 2 removal process at a natural gas hydrogen production plant

Hajduga,

Chmielarz,

Bugdol

2024

Preprint

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The search for solutions to reduce carbon dioxide emissions is an extremely important issue today. The European Parliament’s ENVI Committee (Committee on the Environment, Public Health and Food Safety), focused on reducing CO2 emissions, is the largest committee in the Parliament. According to the Committee’s findings, for certain sectors of the economy, the number of free CO2 emission allowances will fall to 0 in 2035. This will entail a significant increase in production costs. There is little time to make changes, so it is necessary to concentrate all efforts on the most efficient methods. The purpose of this article is to present a proposal to reduce CO2 emissions by recycling low-potential heat from the Benfield CO2 removal process at a plant producing hydrogen from natural gas. The article presents a method for reducing CO2 in the overall process of producing hydrogen, a product widely used in the chemical sector, in particular in the manufacture of fertilisers, essential for feeding the population. The article discusses the use of low- temperature heat in the CO2 capture process with amines using the Benfield method with MVR systems. Heat recovery is hampered by the fact that the heat source is a mixture of carbon dioxide and steam. This causes a reduction in the partial pressure of steam, thus lowering its phase transition temperature and making heat recovery difficult. At present, the literature on the subject does not present any solution of this type. The presented analysis also includes economic calculations confirming the profitability of investing in the presented solution. The following research methods have been used in the study: a review of the relevant literature and an analysis of the whole technological process and its relations with other processes. The result of the conducted study is a solution allowing for the recovery of more than 89% of total heat exchanged from gas mixture after desorption column in Benfield CO2 capture process in hydrogen plant. Improvements in the reduction of heat losses directly linked to CO2 emissions reach 89%. In the future, highly efficient heat loss reduction methods will be the basis for maintaining the profitability of production operations.

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Split Heat Pump Distillation Based on Two‐Stage Compression for Separating an Acetone‐Water Mixture

Cited by 3 publications

References 19 publications

Reduction of CO2 emissions by recycling low-potential heat from the Benfield CO2 removal process at a natural gas hydrogen production plant

Reduction of CO2 emissions by recycling low-potential heat from the Benfield CO2 removal process at a natural gas hydrogen production plant

Systematic study of energy-saving bioethanol distillation process with sidestreams: Design and control

Reduction of CO 2 emissions by recycling low-potential heat from the Benfield CO 2 removal process at a natural gas hydrogen production plant

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