INORGANIC CHEMISTRY INVENTIONS
1. Haber-Bosch Process (1909):
-It is a method that brought revolution in the production of ammonia. Nitrogen (N2) and hydrogen (H2) gases are used to produce ammonia (NH3).
-German chemist Fritz Haber and engineer Carl Bosch in the early 20th century developed this process which had a profound impact on the production of fertilizers, explosives, and other chemicals.
- In 1904, by using a combination of nitrogen and hydrogen gases Fritz Haber experimented the production of ammonia.
-However in 1909,He achieved a breakthrough as he was able to develope a process which by using high pressure and temperature converted nitrogen and hydrogen into ammonia.
-Commercial-scale production of ammonia was made possible in 1913 by the efforts of,an engineer at BASF, Carl Bosch who jointly worked with Haber thus scaling up the process.
-The ammonia produced by this process is used to manufacture fertilizers like ammonium nitrate and urea.
-It is also used to produce nitroglycerin and TNT and this process is a critical constituent of the chemical industry, providing a raw material for the production of plastics, fibers, and other chemicals.
-It operates on the following Principles:
•Nitrogen and hydrogen gases:These two gases are used as feedstocks for the process to be carried out
•High pressure and temperature:The gases are subjected to high pressure (200-300 atm) and temperature (400-500°C) in the presence of a catalyst, typically iron.
• Ammonia production: The nitrogen and hydrogen gases react to form ammonia, which is then cooled, condensed, and collected.
•Reactions:
N2 + 3H2 → 2NH3 + 92 kJ/mol (heat of reaction)
-Largescale production of fertilizers because of this process has contributed to increased food production and reduced hunger.
- Production of chemicals and materials that are essential for modern industry has been possible because of this process which has significantly boosted global economy.
-However this process is energy-intensive and produces greenhouse gas emissions which contributes towards the climate change.
2. Chlorine Disinfection (1799):
-Chlorine disinfection is a widely used method which led to the breakthrough in purifying water.
- Water is purified by killing bacteria, viruses, and other microorganisms.
-Chlorine is added to water, which reacts with the microorganisms, ultimately leading to their destruction.
- In the late 18th century, when chlorine was used to bleach textiles,it was firslty use for disinfection.
- In 1799, Nicolas Appert, a French scientist, discovered that chlorine could be used to disinfect water.
-In early 20th century,chlorine Disinfection process was widely adopted as cities were implementing large-scale water treatment plants.
-It operates on the following Principles:
•Chlorine addition: It is added to the water in different forms like chlorine gas, sodium hypochlorite solution, or calcium hypochlorite granules.
•Reaction with microorganisms:The chlorine then reacts with the microorganisms in the water which includes bacteria, viruses, and protozoa.
•Disinfection:The reaction between chlorine and the microorganisms ultimately leads to their destruction thus disinfecting the water.
-This process is effective against a wide range of microorganisms such as bacteria, viruses, and protozoa.
-It is relatively a low-cost method of water purification because it is widely available and can be easily transported and stored.
-However this process can also produce toxic byproducts, such as trihalomethanes (THMs) and haloacetic acids (HAAs).
- It can cause corrosion of pipes and other equipment and can even change the residual taste and odor of water.
-There are three types of chlorine Disinfection:
1.Chlorine gas disinfection: Chlorine gas is added directly to the water.
2. Hypochlorite disinfection:Sodium hypochlorite solution or calcium hypochlorite granules are added to the water.
3. Chlorine dioxide disinfection:Chlorine dioxide is used as a disinfectant, particularly in situations where chlorine is not effective.
ORGANIC CHEMISTRY INVENTIONS
1. Polymerization of Plastics (1907):
-Polymerization is considered as a revolutionary process in which small molecules, called monomers, combines to form a large molecule,through a chemical reaction and that large molecule is known as a polymer.
- The concept of polymerization was proposed by scientists like Hermann Staudinger and Wallace Carothers in the 19th Century when they were experimenting to combine monomers.
- In 1907, the first synthetic polymer, Bakelite, was developed by Leo Baekeland and it was a thermosetting plastic.
- In the mid-20th century,polyethylene and polypropylene occurred which are the modern plastics.
-It operates on the following Principles:
•Monomers: Small molecules, called monomers, are combined to form a polymer.
•Initiation:The polymerization reaction is initiated by a catalyst or heat.
•Propagation: The monomers react with each other, forming a chain of molecules.
•Termination: The polymerization reaction is terminated when the chain is complete.
-It is a process which is widely used to produce a variety of plastics, including polyethylene, polypropylene, and polyvinyl chloride (PVC).
-The plastics produced used in a wide range of applications which includes packaging, automotive, aerospace, and medical devices.
- The industries of Plastic manufacturing have been proved to be a significant contributor in the global economy, with millions of people employed in the production and processing of plastics.
-There are three types of Polymerization:
1. Addition polymerization:Monomers are added to the growing polymer chain, one at a time.
2. Condensation polymerization:Monomers react with each other, releasing a small molecule, such as water or methanol.
3. Ring-opening polymerization:A cyclic monomer is opened, and the resulting molecule is added to the growing polymer chain.
-Some common Plastics Produced by Polymerization:
1. Polyethylene (PE):Used in packaging, plastic bags, and containers.
2. Polypropylene (PP): Used in automotive, packaging, and textiles.
3. Polyvinyl Chloride (PVC):Used in construction, packaging, and medical devices.
4. Polystyrene (PS): Used in packaging, foam cups, and insulation.
2. Penicillin (1928):
-Penicillin is a considered as revolutionary discovery as it was used for the treatment of bacterial infections.
-It is a group of antibiotics derived from the fungus Penicillium.
-Alexander Fleming a Scottish scientist in 1928 accidentally discovered penicillin when he left a petri dish of bacteria uncovered, and later he noticed that it became contaminated with a mold that killed the surrounding bacteria.
-He observed that the mold had produced a substance that could dissolve bacterial cell walls,then he isolated and purified the substance, which he named penicillin.
-In the early 1940s, Penicillin was first tested on humans and its effectiveness in treating bacterial infections was confirmed.
-It has the following Principle of Action:
•It works by interfering with the formation of bacterial cell walls, ultimately leading to the death of the bacterial cells.
•It is very specific to bacterial cells and does not harm human cells.
-It is used to treat variety of bacterial infections which includes pneumonia, meningitis, and septicemia.
-It can be used for the prevention of infection in patients undergoing surgery or with compromised immune systems and can also be used to treat bacterial infections in animals.
-It has revolutionized the treatment of bacterial infections, saving countless lives henceforth significantly reducing mortality rates from bacterial infections.
-It has enabled the development of modern medicine, including organ transplantation and cancer treatment.
-Their are three types of Penicillin:
1. Natural penicillins:Derived directly from the fungus Penicillium.
2. Semisynthetic penicillins:Modified natural penicillins with improved properties.
3. Synthetic penicillins:Completely synthetic penicillins with specific properties.