The Leblanc process was the industrial process for the production of soda ash (sodium carbonate) used throughout the 19th century. R-phrases S-phrases , , Flash point non flammable RTECS number VZ4050000 Supplementary data page Structure and properties n, εr, etc. ...

Background

Soda ash and potash (potassium carbonate), collectively termed alkali, are vital chemicals in the glass, textile, soap, and paper industries. The traditional source of alkali in western Europe had been potash obtained from wood ashes. However, by the 1700s, deforestation had rendered this means of production uneconomical, and alkali had to be imported. Potash was imported from North America, Scandinavia, and Russia, where large forests still stood. Soda ash was imported from Spain and the Canary Islands, where it was produced from the marine plant barilla, whose ashes contained up to 30% soda ash, or from Egypt, where the mineral natron was mined from dry lakebeds. Especially in Britain, the only local source of alkali was from kelp, which washed ashore in Scotland and Ireland. Potassium carbonate is a white salt, soluble in water (insoluble in alcohol), which forms a strongly alkaline solution. ... This article refers to the material. ... It has been suggested that Textile manufacturing be merged into this article or section. ... Soap most commonly appears in bar form. ... This article or section contains information that has not been verified and thus might not be reliable. ... A tree trunk as found at the Veluwe, The Netherlands Wood derives from woody plants, notably trees but also shrubs. ... Deforestation is the conversion of forested areas to non-forested. ... World map showing North America A satellite composite image of North America. ... See also the Nordic countries. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Natron is a white, crystalline hygroscopic mineral salt, primarily a mixture of sodium bicarbonate (common baking soda) and sodium carbonate (soda ash) with small amounts of sodium chloride (table salt) and sodium sulfate. ... Families Alariaceae Chordaceae Laminariaceae Lessoniaceae Phyllariaceae Pseudochordaceae Kelp are large seaweeds, belonging to the brown algae and classified in the order Laminariales. ... Motto: Nemo me impune lacessit (Eng: No one provokes me with impunity) Scotlands location within Europe Scotlands location within the United Kingdom Languages English, Gaelic, Scots Capital Edinburgh Largest city Glasgow First Minister Jack McConnell Area - Total - % water Ranked 2nd UK 78,782 km² 1. ...

In 1783, King Louis XVI of France and the French Academy of Sciences offered a prize of 2400 livres for a method to produce alkali from sea salt (sodium chloride). In 1791, Nicolas Leblanc, physician to Louis Philip II, Duke of Orléans, patented a solution. 1783 was a common year starting on Wednesday (see link for calendar). ... Louis XVI (August 23, 1754, Versailles – January 21, 1793, Paris) was King of France and Navarre from 1774 until 1791, and then King of the French from 1791 to 1793. ... The French Academy of Sciences (Académie des sciences) is a learned society, founded in 1666 by Louis XIV at the suggestion of Jean-Baptiste Colbert, to encourage and protect the spirit of French scientific research. ... The livre tournois (or Tournoise pound) was a currency used in France, named after the town of Tours, in which it was minted. ... Flash point Non-flammable R/S statement R: none S: none RTECS number VZ4725000 Supplementary data page Structure and properties n, εr, etc. ... 1791 (MDCCXCI) was a common year starting on Saturday (see link for calendar) of the Gregorian calendar (or a common year starting on Tuesday of the 11-day-slower Julian calendar). ... Nicolas Leblanc (December 6, 1742 – January 16, 1806) was a French chemist and surgeon who discovered how to manufacture soda from common salt. ... Louis-Philippe-Joseph dOrléans, by Antoine-François Callet. ...

Chemistry

The Leblanc process was a batch process in which sodium chloride was subjected to a series of treatments, eventually producing sodium carbonate. In the first step, the sodium chloride was heated with sulfuric acid to produce sodium sulfate (called the salt cake) and hydrochloric acid gas according to the chemical equation Sulfuric acid (British English: sulphuric acid), H2SO4, is a strong mineral acid. ... Supplementary data page Structure and properties n, εr, etc. ... The chemical substance hydrochloric acid is the aqueous (water-based) solution of hydrogen chloride (HCl) gas. ... A chemical equation is a symbolic representation of a chemical reaction. ...

2 NaCl + H₂SO₄ → Na₂SO₄ + 2 HCl

This chemical reaction had been discovered in 1772 by the Swedish chemist Carl Wilhelm Scheele. Leblanc's contribution was the second step, in which the salt cake was mixed with crushed limestone (calcium carbonate) and coal and fired. In the ensuing chemical reaction, the coal (carbon) was oxidized to carbon dioxide, reducing the sulfate to sulfide and leaving behind a solid mixture of sodium carbonate and calcium sulfide, called black ash. Flash point Non-flammable R/S statement R: none S: none RTECS number VZ4725000 Supplementary data page Structure and properties n, εr, etc. ... Sulfuric acid (British English: sulphuric acid), H2SO4, is a strong mineral acid. ... Supplementary data page Structure and properties n, εr, etc. ... The chemical substance hydrochloric acid is the aqueous (water-based) solution of hydrogen chloride (HCl) gas. ... A chemical reaction is a process that results in the interconversion of chemical substances [1]. The substance or substances initially involved in a chemical reaction are called reactants. ... 1772 was a leap year starting on Wednesday (see link for calendar). ... Carl Wilhelm Scheele Scheeles house with his pharmacy in Köping. ... Limey shale overlaid by limestone. ... Calcium carbonate is a chemical compound, with chemical formula CaCO3. ... Coal is a fossil fuel extracted from the ground by underground mining or open-pit mining (strip mining). ... General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... The most fundamental reactions in chemistry are the redox processes. ... Carbon dioxide is an atmospheric gas comprised of one carbon and two oxygen atoms. ... Reduction or reducing has several meanings: In mathematics, reduction is the process of manipulating a series of equations or matrices into a desired simpler format. ... In inorganic chemistry, a sulfate (IUPAC-recommended spelling; also sulphate in British English) is a polyatomic anion or a compound containing this group. ... The term sulfide (sulphide in British) refers to several types of chemical compounds containing sulfur in its lowest oxidation number of -2. ... Calcium sulfide (CaS), also known as calcium monosulfide, hepar calcies, and sulfurated lime, is a white cubic crystal used in the manufacturing of phosphors, and as an insecticide and fungicide. ...

Na₂SO₄ + CaCO₃ + 2 C → Na₂CO₃ + CaS + 2 CO₂

Because sodium carbonate is soluble in water, but neither calcium carbonate nor calcium sulfide is, the soda ash was then separated from the black ash by washing it with water. The wash water was then evaporated to yield solid sodium carbonate. This extraction process was termed lixiviation. Supplementary data page Structure and properties n, εr, etc. ... Calcium carbonate is a chemical compound, with chemical formula CaCO3. ... General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... Calcium sulfide (CaS), also known as calcium monosulfide, hepar calcies, and sulfurated lime, is a white cubic crystal used in the manufacturing of phosphors, and as an insecticide and fungicide. ... Carbon dioxide is an atmospheric gas comprised of one carbon and two oxygen atoms. ...

Industrial history

Leblanc established the first Leblanc process plant in 1791 in St. Denis. However, the French Revolution seized the plant, along with the rest of Louis Philip's estate, in 1794, and publicized Leblanc's trade secrets. Napoleon I returned the plant to Leblanc in 1801, but lacking the funds to repair it and compete against other soda works that had been established in the meantime, Leblanc committed suicide in 1806. 1791 (MDCCXCI) was a common year starting on Saturday (see link for calendar) of the Gregorian calendar (or a common year starting on Tuesday of the 11-day-slower Julian calendar). ... The Basilica of Saint Denis (in French, la Basilique de Saint-Denis), a famous burial site for French monarchs, is located in Saint Denis (near Paris). ... The French Revolution (1789-1799) was a period in the history of France. ... 1794 was a common year starting on Wednesday (see link for calendar). ... A trade secret is a confidential practice, method, process, design, the know-how or other information used by a business to compete with other businesses. ... For other uses, see Napoleon (disambiguation). ... The Union Jack, flag of the newly formed United Kingdom of Great Britain and Ireland. ... Here, at the top of the right box, there should stand the number of a hotline: (123456789). ... 1806 was a common year starting on Wednesday (see link for calendar). ...

By the early 1800's, French soda ash producers were making 10,000 - 15,000 tons annually. However, it was in Britain that the Leblanc process became most widely practiced. The first British soda works was built by John Losh on the River Tyne in 1807, but steep British tariffs on salt production hindered the economics of the Leblanc process and kept such operations on a small scale until 1824. Following the repeal of the salt tariff, the British soda industry grew dramatically, and the chemical works established by James Muspratt in Liverpool and Charles Tennant near Glasgow became some of the largest in the world. By the 1870s, the British soda output of 200,000 tons annually exceeded that of all other nations in the world combined. The River Tyne can refer to two rivers in the United Kingdom: River Tyne, England River Tyne, Scotland This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... 1807 was a common year starting on Thursday (see link for calendar). ... A tariff is a tax on imported goods. ... 1824 was a leap year starting on Thursday (see link for calendar). ... James Muspratt (August 12, 1793 - May 4, 1886), British chemical manufacturer, was born in Dublin. ... Liverpool waterfront by night, as seen from the Wirral. ... For other uses, see Glasgow (disambiguation). ...

Pollution issues

The Leblanc process plants were decidedly not environmentally friendly. The process of generating salt cake from salt and sulfuric acid released hydrochloric acid gas, and because this acid was industrially useless in the early 1800s, it was simply vented into the atmosphere. In addition, for every 8 tons of soda ash, the process produced 7 tons of calcium sulfide waste. This solid waste had no economic value, and was piled in heaps and spread on fields near the soda works, where it weathered to release hydrogen sulfide, the gas responsible for the odor of rotten eggs. Hydrogen sulfide (hydrogen sulphide in British English), H2S, is a colorless, toxic, flammable gas that is responsible for the foul odor of rotten eggs. ... A carton of free-range chicken eggs Ostrich egg Bird eggs are a common food source. ...

Because of their noxious emissions, Leblanc soda works became targets of lawsuits and legislation. An 1839 suit against soda works alleged, "the gas from these manufactories is of such a deleterious nature as to blight everything within its influence, and is alike baneful to health and property. The herbage of the fields in their vicinity is scorched, the gardens neither yield fruit nor vegetables; many flourishing trees have lately become rotten naked sticks. Cattle and poultry droop and pine away. It tarnishes the furniture in our houses, and when we are exposed to it, which is of frequent occurrence, we are afflicted with coughs and pains in the head ... all of which we attribute to the Alkali works."

In 1863, the British Parliament passed the first of several Alkali Acts, the first modern air pollution legislation. This act allowed that no more than 5% of the hydrochloric acid produced by alkali plants could be vented to the atmosphere. To comply with the legislation, soda works passed the escaping hydrogen chloride gas up through a tower packed with charcoal, where it was absorbed by water flowing in the other direction. The chemical works usually dumped the resulting hydrochloric acid solution into nearby bodies of water, killing fish and other aquatic life. 1863 (MDCCCLXIII) is a common year starting on Thursday of the Gregorian calendar (or a common year starting on Saturday of the Julian calendar). ... Under the British Alkali Act 1863, an Alkali Inspector and four sub-inspectors were appointed to curb the discharge into the air of hydrochloric gas from chlor-alkali works. ... This power plant in New Mexico releases sulfur dioxide and particulate matter into the air. ... Charcoal is the blackish residue consisting of impure carbon obtained by removing water and other volatile constituents of animal and vegetable substances. ... Atlantic herring, Clupea harengus: the most abundant species of fish in the world. ...

By the 1880s, methods for converting the hydrochloric acid to chlorine gas for the manufacture of bleaching powder and for reclaiming the sulfur in the calcium sulfide waste had been discovered, but by this time, the Leblanc process was becoming obsolete. General Name, Symbol, Number chlorine, Cl, 17 Chemical series halogens Group, Period, Block 17, 3, p Appearance yellowish green Atomic mass 35. ... In chemistry, to bleach something generally means to whiten it or oxidize it. ...

Obsolesence

In 1861, the Belgian chemist Ernest Solvay developed a more direct process for converting producing soda ash from salt and limestone through the use of ammonia. The only waste product of this Solvay process was calcium chloride, and so it was both more economical and less polluting than the Leblanc method. From the late 1870s, Solvay-based soda works on the European continent provided stiff competition in their home markets to the Leblanc-based British soda industry. Additionally the Brunner Mond Solvay plant which opened in 1874 at Winnington near Northwich provided fierce competition nationally. By 1900, 90% of the world's soda production was through the Solvay method, or on the North American continent, through the mining of trona, discovered in 1938, which caused the closure of the last North American Solvay plant in 1986. The last Leblanc-based soda ash plant closed in the early 1920s. 1861 is a common year starting on Tuesday. ... The portrait of participants to the first Solvay Conference in 1911. ... Ammonia is a compound of nitrogen and hydrogen with the formula NH3. ... Chemistry The Solvay process calcium carbonate: CaCO3 → CO2 + CaO The solid sodium bicarbonate is then filtered out and converted to sodium carbonate by heating it, recovering some carbon dioxide in the process: 2 NaHCO3 → Na2CO3 + H2O + CO2 Meanwhile, ammonia is recovered from the ammonium chloride byproduct by treating the ammonium... R-phrases S-phrases , , RTECS number EV9800000, anhydrous EV9810000, dihydrate EV9830000, hexahydrate Supplementary data page Structure & properties n, εr, etc. ... // Events and Trends Technology The invention of the telephone (1876) by Alexander Graham Bell. ... World map showing Europe Europe is conventionally considered one of the seven continents of Earth which, in this case, is more a cultural and political distinction than a physiogeographic one. ... 1874 (MDCCCLXXIV) was a common year starting on Thursday (see link for calendar). ... A small, mainly residential area of the town of Northwich. ... Map sources for Northwich at grid reference SJ651733 Arms of Northwich Town Council Northwich is a town in Cheshire, England with a population of around 50,000. ... 1900 (MCM) was an exceptional common year starting on Monday. ... Trona, hydrated sodium bicarbonate carbonate (Na3HCO3CO3·2H2O), is an evaporite mineral. ... 1938 (MCMXXXVIII) was a common year starting on Saturday (link will take you to calendar). ... 1986 (MCMLXXXVI) was a common year starting on Wednesday of the Gregorian calendar. ... It has been suggested that Roaring Twenties be merged into this article or section. ...

Ecological postscript: The grey galligu residuue deposits weather down to orange, as iron II is oxidised to iron III. This colour transition is eating down into the deposits; in 1998 it was c. 1m deep at the best known deposit at Nob end, Bolton, and leaves behind an infertile alkaline soil. This site is a locally important nature reserve and an SSSI for the scarce and unusual plants (orchids and calcicoles) growing on the waste. There are 2 other Leblanc deposits in the manchester area, and that is now it, probably for the planet! Extensive areas in the Halton area have been covered over, as has the last deposit in Newcastle (south bank of the Tyne). There is therefore an argument that leblanc waste is the most endangered ecossyetm in the UK. Reference: Shaw, PJA & Halton W. (1998). Classic sites: Nob End, Bolton. British Wildlife 10, 13-17.