Calcium carbide

Chemical compound

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Chemical compound

Calcium carbide, also known as calcium acetylide, is a chemical compound with the chemical formula of CaC2. Its main use industrially is in the production of acetylene and calcium cyanamide.[3]

The pure material is colorless, while pieces of technical-grade calcium carbide are grey or brown and consist of about 80&#;85% of CaC2 (the rest is CaO (calcium oxide), Ca3P2 (calcium phosphide), CaS (calcium sulfide), Ca3N2 (calcium nitride), SiC (silicon carbide), C (carbon), etc.). In the presence of trace moisture, technical-grade calcium carbide emits an unpleasant odor reminiscent of garlic.[4]

Applications of calcium carbide include manufacture of acetylene gas, generation of acetylene in carbide lamps, manufacture of chemicals for fertilizer, and steelmaking.

Production

Calcium carbide is produced industrially in an electric arc furnace from a mixture of lime and coke at approximately 2,200 °C (3,990 °F).[5] This is an endothermic reaction requiring 110 kilocalories (460 kJ) per mole[6] and high temperatures to drive off the carbon monoxide. This method has not changed since its invention in :

CaO + 3 C &#; CaC2 + CO

The high temperature required for this reaction is not practically achievable by traditional combustion, so the reaction is performed in an electric arc furnace with graphite electrodes. The carbide product produced generally contains around 80% calcium carbide by weight. The carbide is crushed to produce small lumps that can range from a few mm up to 50 mm. The impurities are concentrated in the finer fractions. The CaC2 content of the product is assayed by measuring the amount of acetylene produced on hydrolysis. As an example, the British and German standards for the content of the coarser fractions are 295 L/kg and 300 L/kg respectively (at 101 kPa pressure and 20 °C (68 °F) temperature). Impurities present in the carbide include calcium phosphide, which produces phosphine when hydrolysed.[7]

This reaction was an important part of the Industrial Revolution in chemistry, and was made possible in the United States as a result of massive amounts of inexpensive hydroelectric power produced at Niagara Falls before the turn of the 20th century.[8] The electric arc furnace method was discovered in by T. L. Willson, and independently in the same year by H. Moissan.[9][10][11] In Jajce, Bosnia and Herzegovina, the Austrian industrialist Josef Kranz and his "Bosnische-Elektrizitäts AG" company, whose successor later became "Elektro-Bosna", opened the largest chemical factory for the production of calcium carbide at the time in Europe in . A hydroelectric power station on the Pliva river with an installed capacity of 8 MW was constructed to supply electricity for the factory, the first power station of its kind in Southeast Europe, and became operational on 24 March .[12]

Crystal structure

Pure calcium carbide is a colourless solid. The common crystalline form at room temperature is a distorted rock-salt structure with the C22&#; units lying parallel.[13] There are three different polymorphs which appear at room temperature: the tetragonal structure and two different monoclinic structures.[1]

Applications

Production of acetylene

The reaction of calcium carbide with water, producing acetylene and calcium hydroxide,[5] was discovered by Friedrich Wöhler in .

This reaction was the basis of the industrial manufacture of acetylene, and is the major industrial use of calcium carbide.

Today acetylene is mainly manufactured by the partial combustion of methane or appears as a side product in the ethylene stream from cracking of hydrocarbons. Approximately 400,000 tonnes are produced this way annually (see acetylene preparation).

In China, acetylene derived from calcium carbide remains a raw material for the chemical industry, in particular for the production of polyvinyl chloride. Locally produced acetylene is more economical than using imported oil.[14] Production of calcium carbide in China has been increasing. In output was 8.94 million tons, with the capacity to produce 17 million tons.[15]

In the United States, Europe, and Japan, consumption of calcium carbide is generally declining.[16] Production levels in the US during the s were 236,000 tons per year.[13]

Production of calcium cyanamide

Calcium carbide reacts with nitrogen at high temperature to form calcium cyanamide:[5]

CaC2 + N2 &#; CaCN2 + C

Commonly known as nitrolime, calcium cyanamide is used as fertilizer. It is hydrolysed to cyanamide, H2NCN.[5]

Steelmaking

Calcium carbide is used:

• in the desulfurization of iron (pig iron, cast iron and steel)

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• as a fuel in steelmaking to extend the scrap ratio to liquid iron, depending on economics.
• as a powerful deoxidizer at ladle treatment facilities.

Carbide lamps

Calcium carbide is used in carbide lamps. Water dripping on carbide produces acetylene gas, which burns and produces light. While these lamps gave steadier and brighter light than candles, they were dangerous in coal mines, where flammable methane gas made them a serious hazard. The presence of flammable gases in coal mines led to miner safety lamps such as the Davy lamp, in which a wire gauze reduces the risk of methane ignition. Carbide lamps were still used extensively in slate, copper, and tin mines where methane is not a serious hazard. Most miners' lamps have now been replaced by electric lamps.

Carbide lamps are still used for mining in some less wealthy countries, for example in the silver mines near Potosí, Bolivia. Carbide lamps are also still used by some cavers exploring caves and other underground areas,[17] although they are increasingly being replaced in this use by LED lights.

Carbide lamps were also used extensively as headlamps in early automobiles, motorcycles and bicycles, but have been replaced entirely by electric lamps.[18]

Other uses

Calcium carbide is sometimes used as source of acetylene, which like ethylene gas, is a ripening agent.[19] However, this is illegal in some countries as, in the production of acetylene from calcium carbide, contamination often leads to trace production of phosphine and arsine.[20][21] These impurities can be removed by passing the acetylene gas through acidified copper sulfate solution, but, in developing countries, this precaution is often neglected.

Calcium carbide is used in toy cannons such as the Big-Bang Cannon, as well as in bamboo cannons. In the Netherlands calcium carbide is used around new-year to shoot with milk churns.[22]

Calcium carbide, together with calcium phosphide, is used in floating, self-igniting naval signal flares, such as those produced by the Holmes' Marine Life Protection Association.

Calcium carbide is used to determine the moisture content of soil. When soil and calcium carbide are mixed in a closed pressure cylinder, the water content in soil reacts with calcium carbide to release acetylene whose pressure can be measured to determine the moisture content.[23][24]

Calcium carbide is sold commercially as a mole repellent.[25] When it comes into contact with water, the gas produced drives moles away.[26]

References

Calcium Carbide

Calcium carbide is a chemical compound salt. Also, we can refer it to as calcium acetylide. Besides, it is a compound that we use in industries for production. The calcium is harmful for human consumption.

Structure of Calcium Carbide

The other name of Calcium Carbide is Calcium Acetylide. Furthermore, its chemical formula is CaC2 (One atom of calcium and two-atom of carbon).

Mainly, we use it in industries in the production of acetylene and calcium cyanamide. Besides, in the presence of a trace of moisture, technical grade calcium carbide emits an unpleasant odour like garlic.

Moreover, in the presence of water, it produces acetylene gas. Furthermore, we use this gas in cutting torches and for welding.

In addition, according to HKTDC (Hong Kong Trade Development Council) calcium carbide constitute a key component of most PVC (Polyvinyl Chloride) produced in China.

For a long time, we use lime and coal to produce calcium carbide in a furnace. Besides, the United States EPA (Environmental Protection Agency) found the particulate matter and other byproducts enter the environment as a result of the production of it.

But, the hydrocarbon emission is minimal in its production. Also, its pure form is colourless, crystalline solid like rock salt. Furthermore, it produces high flames means flames that are hotter than normal flames.

How to Make Calcium Carbide?

Making calcium carbide is a difficult process. Also, it involves a complex method. Furthermore, you need a furnace, lime, and coal for making it.

Moreover, this process requires a high temperature that cannot be achieved with traditional furnaces and we need an electrical arc furnace for it.

Furthermore, the high temperature that we need can&#;t be achieved with traditional combustion method. Moreover, the finished product is 80 per cent calcium carbide.

• First Step- Insert lime and coal into an arc furnace.
• Second Step- After that heat the furnace to at least a temperature of 3,632 degrees Fahrenheit (2,000-degrees Centigrade). Also, make sure that the temperature does not exceed 3,812 degrees Fahrenheit (2,100-degrees Centigrade).
• Third Step- Next place the electrode paste near the electric arc of the furnace to bake.
• Fourth Step- After that, feed the baked electrode to the furnace as it will act as a catalyst for the lime and coal.
• Fifth Step- After the baking is complete move the molten calcium carbide into a piece of cooling equipment (A chilling mechanism). Furthermore, it will allow it to solidify.
• Sixth Step- Put the solidified calcium carbide into a crushing mechanism or use some tool to break it into the desired size.

Uses of Calcium Carbide

There are various uses of it. Also, the main use of it is in the manufacturing of acetylene gas, and fro generation of acetylene in carbide lamps.

Furthermore, we use it in the manufacturing of chemicals for fertilizers and in steel making and hardening of steel. Moreover, in the past, they use a solution of acetylene in the street light.

Also, when it reacts with nitrogen it produces calcium cyanamide commonly known as nitro lime which we use as fertilizers.

Furthermore, it is a ripening agent of food, In addition, industries use it in toy cannons as well as bamboo cannons.

It is also used with calcium phosphide in floating, self-igniting solar flares.

Solved Question for You

Question. Which of the following we do not use in the production of calcium carbide?

A. Calcium
B. Limestone
C. Coal
D. Carbon

Answer. The correct answer is option A. As calcium is not directly used calcium in the production of calcium carbide. Besides, calcium is required in the process which is fulfilled by limestone.

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