Effect of potassium carbonate on catalytic synthesis of calcium carbide at moderate temperature

Abstract

Calcium carbide was successfully synthesized by carbothermal reduction of lime with coke at 1973 K for 1.5 h. The effect of potassium carbonate as additive on the composition and morphology of the product was investigated using X-ray diffraction and scanning electron microscope. Addition of potassium carbonate increased the yield of calcium carbide. The sample in the presence of potassium carbonate generated acetylene gas of 168.3 L/ kg, which was 10% higher than that in the absence of potassium carbonate. This result confirmed the catalytic effect of potassium carbonate on the synthesis of calcium carbide. A possible mechanism of the above effects was that the additive, which was melted at the reduction temperature, dissolved CaO and so promoted the contact between CaO and carbon, which was essential for the solid-solid reaction to form calcium carbide.

Synthesis of CaC2 and the Adsorption Mechanism of Alkaline Metals on the CaC2 Surface

“…CaC 2 is the main component of calcium carbide and is produced by a melting and cooling process, in which the coke and quicklime are reacting under high-temperature solid-state reaction conditions of up to 2200 °C. , During the production process, such as coking, limestone roasting, and power generating, these are highly energy consuming and polluting . It makes the calcium carbide industry one of the most important industries for reducing double energy consumption.…”

Carbon-Calcium Composite Conversion Calcium Carbide Acetylene System: Material and Energy Transformation, Exergy Evaluations

“…China is currently the largest producer and consumer of calcium carbide in the world, and the coal reserves are adequate for coal based calcium carbide industry [1]. At present, the electro-thermal method is mainly used in industry to produce calcium carbide at 2000 ℃, and the power consumption for each ton of calcium carbide is about 3500 kWh [2,3]. However, the production of calcium carbide basically relies on coal electricity [3,4].…”

A Novel Coal-Based Calcium Carbide-Acetylene System Process Based on Multistage Carbon Capture and Waste Slag Recycling Design: A Multiobjective Optimization Evaluation Perspective

“…At present, the electro-thermal method (ETM) and the oxy-thermal method (OTM) are the main production methods of calcium carbide. , However, the drawbacks of a large amount of carbon consumption, high energy consumption, and serious pollution in producing calcium carbide by ETM still restrict its development. , Thus, some scholars turn their attention to the oxy-thermal method (OTM), that is, direct combustion of coal provides energy for calcium carbide production to avoid the energy loss from coal to electricity …”