Preparation of feed grade calcium formate from calcium carbide residue

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• 作者：Hang Ma ; Xiao Feng ; Yabin Yang…
• 关键词：Industrial waste recycling ; CO2 emission reduction ; Clean and green chemical technology ; Calcium carbide residue ; Calcium formate
• 刊名：Clean Technologies and Environmental Policy
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：18
• 期：6
• 页码：1905-1915
• 全文大小：866 KB
• 刊物类别：Engineering
• 刊物主题：Industrial and Production Engineering
  Industrial Chemistry and Chemical Engineering
  Industrial Pollution Prevention
  Environmental Economics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1618-9558
• 卷排序：18

文摘

Calcium carbide residue is generated from the reaction of CaC₂ (calcium carbide) and water in the production of acetylene in the chlor-alkali industry. The main component contained in calcium carbide residue is Ca(OH)₂ (calcium hydroxide). At present, great amounts of calcium carbide residue in China are disposed by land stockpiling or landfilling. These disposal practices cause serious environmental pollution and lead to resource wastage. Effective disposal methods by recycling and reusing the calcium carbide residue are urgently needed. In this paper, a novel method for producing feed grade calcium formate from calcium carbide residue is introduced. The calcium carbide residue and CO (carbon monoxide) are utilized as raw materials to prepare Ca(HCOO)₂ (calcium formate) through the carbonylation synthesis route. The optimal reaction conditions (reaction temperature = 200 °C, reaction pressure = 6 MPa, reaction time = 22.5 min, and slurry concentration = 0.125 g/mL) have been obtained through pilot-scale experimental studies with the aim of producing high-quality feed grade calcium formate product. Data from the continuous pilot plant are used to evaluate the economic feasibility of the production method. In addition, CO, which is acquired from industrial exhausts, is innovatively used as a reactant to produce calcium formate instead of being treated as a waste material, reducing carbon dioxide emissions significantly. Therefore, the proposed method is a very promising clean and green chemical technology that turns calcium carbide residue and industrial exhaust gas into a useful product, promoting the development of industrial waste recycling in China.