Difference Between Leblanc and Solvay Process

Thekey differencebetween Leblanc and Solvay process is thatSolvay工艺中的起始材料比Leblanc过程中的起始材料更具成本效益。

Leblanc process and Solvay process are important in chemical synthesis ofsodium carbonate。碳酸钠是具有化学式Na2CO3的无机化合物。Leblanc过程的起始材料是氯化钠, sulfuric acid, coal, and calcium carbonate. The starting materials for the Solvay process are salt brine andlimestone。

内容

1.Overview and Key Difference
2.What is Leblanc Process
3.What is Solvay Process
4.Side by Side Comparison – Leblanc vs Solvay Process in Tabular Form
5.概括

什么是LeBlanc过程？

Leblanc process is an industrial process that is important in producing sodium carbonate using sodium chloride, sulfuric acid, coal, and calcium carbonate. This process comes under the sector of Chlor-alkali industry. Nicolas Leblanc invented this process in 1791. Thereafter, some other scientists including William Losh, James Muspratt, and Charles Tennant further developed this process.

There are two steps of the Leblanc process: the production of sodium sulfate from sodium chloride and the reaction of sodium sulfate with coal and calcium carbonate producing sodium carbonate. However, this process gradually became obsolete after the introduction of the Solvay process.

The first step of the Leblanc process is the reaction between sodium chloride and sulfuric acid, which produces sodium sulfate and hydrogen chloride. The second step involves the reaction between a mixture of the salt cake and crushed limestone that is reduced by heating with coal. This second step occurs in two stages; first is the carbothermic reaction in which the coal reduces sulfate to sulfide while the second stage is the reaction that produces sodium carbonate and calcium sulfide. The product mixture that comes from the second stage is named black ash. We can extract soda ash or sodium carbonate from this black ash in the presence of water. This extraction is named lixiviation; here, the water and calcium sulfide is evaporated, yielding sodium carbonate in solid state.

What is Solvay Process?

Solvay process is an industrial process that is important in the production of sodium carbonate using salt brine and limestone. It is the major industrial process used for the production of sodium carbonate. This method is also known as the氨 - 辅助过程。它是由欧内斯特·索尔维（Ernest Solvay）于1860年开发的。此过程的起始材料也很容易获得且便宜。由于这个原因，Solvay过程在LeBlanc过程中占主导地位。

Brine is a source of sodium chloride and limestone is a source of calcium carbonate. There are four basic reactions that take place during the Solvay process: the first step includes the passing of carbon dioxide through a concentrated aqueous solution of sodium chloride (brine) and ammonia. Here, sodium bicarbonate precipitates out of the solution. Secondly, sodium bicarbonate is filtered out from the solution and the solution is then treated with quicklime making a strongly basic solution. As the third step, the sodium bicarbonate is then converted into the final product via calcination. Finally, carbon dioxide produced from the third step is recovered for reuse.

What is the Difference Between Leblanc and Solvay Process?

LeBlanc工艺和溶剂过程对于产生碳酸钠很重要。LeBlanc工艺涉及使用氯化钠，硫酸，煤和碳酸钙生产碳酸钠，而Solvay工艺涉及使用盐盐水和石灰石生产碳酸钠。LeBlanc和Solvay过程之间的主要区别在于，Solvay工艺中的起始材料比LeBlanc过程中的起始材料更具成本效益。

下面的图表显示了不同的更多细节ence between Leblanc and Solvay process.

概括– Leblanc vs Solvay Process

LeBlanc工艺和溶剂过程对于产生碳酸钠很重要。LeBlanc和Solvay过程之间的主要区别在于，Solvay工艺中的起始材料比LeBlanc过程中的起始材料更具成本效益。

Image Courtesy:

1. “Leblanc process reaction scheme” By Sponk (talk) (Vectorization and coloring) – Own work, based on the raster graphic Soda nach Leblanc.png created by Qniemiec(CC BY-SA 3.0)viaCommons Wikimedia

2. “Solvay Process” By Eric A. Schiff, 2006.(CC BY-SA 2.5)viaCommons Wikimedia