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In leather manufacturing industry, sodium sulfide is primarily used for hair removal and deliming processes. Sodium hydroxide is utilized for processes like soaking, dehairing, and neutralization. These chemicals play a crucial role in corroding the roof of any leather production factory. The chemicals facilitate the removal of unwanted proteins, fats, and other impurities from animal hides and skins. Hence, they help in the transformation of raw hides into high-quality leather products.
It is important to handle these chemicals with care and adhere to safety guidelines to ensure the well-being of workers and the environment for your leather factory and roof coatings.
These chemicals are usually produced through industrial chemical processes as follows:
Sodium Sulfide Production:
– Sodium sulfide is commonly prodxuced by reacting sodium hydroxide (caustic soda) with elemental sulfur under controlled conditions.
– The chemical equation for this process is: 2 NaOH + S ⟶ Na2S + H2O
– The reaction typically occurs in a reactor vessel where sodium hydroxide solution is mixed with sulfur and heated to promote the reaction.
– The resulting sodium sulfide solution is then purified and concentrated to the desired strength for use in leather processing.
Sodium sulfide dissolves in water and forms the ions it needs. When heated, it quickly oxidized to generate sodium carbonate and Sulphur dioxide. Sodium sulfide oxidizes quickly by heating. The results will be sodium carbonate and sulfur dioxide which are corrosive for metal roof sheets in a leather factory.
– Sodium hydroxide, also known as caustic soda, is produced by the electrolysis of salt (sodium chloride) solution through a process called the chlor-alkali process.
– In this process, a brine solution (sodium chloride in water) is electrolyzed using a membrane cell or mercury cell to separate chlorine gas, sodium hydroxide solution, and hydrogen gas.
– The chemical equation for the production of sodium hydroxide is: 2 NaCl + 2 H2O ⟶ Cl2 + H2 + 2 NaOH
– The sodium hydroxide solution is then concentrated, purified, and stored for use in various stages of leather processing.
These tanning chemicals play a crucial role in the leather manufacturing process by transforming raw hides and skins into durable, versatile, and visually appealing leather products. It is essential to follow proper guidelines and regulations for handling and disposing of these chemicals to ensure worker safety and environmental sustainability in the leather industry.
Here are the main tanning chemicals produced and used in the leather industry:
Chromium sulfate and chromium oxide are commonly used in the chrome tanning process of leather manufactures. They help to stabilize collagen fibers in the skin, making the leather more supple and resistant to heat and water.
This chemical in aldehyde tanning creates soft and light-colored leathers. It helps in cross-linking collagen fibers and improving the strength and shrinkage temperature of leather.
Tanning agents and synthetic chemicals such as syntans (synthetic tannins), acrylic resins, and polyurethanes. They are there to achieve specific properties in leather, such as softness, color fastness, and water repellency.
Tanning solution that the skins are soaked in, is made of chromium salts. This must be acidic to smooth the way for penetration of the chromium ions into the collagen fibers of the hide.
Steam boilers do the job of dissolution chemicals. The release of acidic and salty vapors from these materials directly affects the roof covering of the leather factory – specifically corrosion and rust of metal roofs.
Sulfuric acid solution gases can be produced during the leather dyeing stage in a factory when acidic substances are used in the dyeing process. These gases, such as sulfur dioxide (SO2) and hydrogen sulfide (H2S), can escape into the atmosphere. Then potentially contribute to the roof corrosion of leather factory – if they come into contact with metal roofing materials. Here is how these gases can affect roof corrosion:
SO2 is a common byproduct of sulfuric acid dissolution processes and can react with moisture in the air to form sulfuric acid (H2SO4). When sulfuric acid comes into contact with metal roofing materials (such as steel). It can cause corrosion through chemical reactions of dying process that degrade the metal surfaces and roof of your leather factory over time.
H2S is another corrosive gas that is released during leather dyeing. When H2S reacts with oxygen and moisture in the atmosphere, it forms sulfur compounds that can accelerate the corrosion of metal roofs in industrial sheds.
To mitigate the potential effects of sulfuric acid dissolution gases on roof corrosion in a leather production factory, consider implementing the following measures:
Read more: How does sulfuric acid cause roof corrosion in factories + Solution
Ensure adequate ventilation systems are in place to capture and remove acidic gases from the dyeing process area to prevent them from escaping into the atmosphere.
Roof Maintenance
Regularly inspect and maintain the factory’s roof to identify and address any signs of corrosion promptly. Applying protective coatings or barriers can help reduce the impact of corrosive gases on the roof surface.
Implement measures to neutralize acidic waste streams before disposal to minimize the release of corrosive gases into the environment.
UPVC (Unplasticized Polyvinyl Chloride) is a durable and resistant material commonly used in construction to prevent corrosion. To protect the roof of leather production companies from corrosion, they use UPVC in various ways:
UPVC is waterproof and resistant to many chemicals including acids and alkalis. The sheets help prevent water ingress and moisture build-up on the roof. This is crucial for preventing corrosion, especially in areas prone to frequent heat or high acidic industrial sheds.
UPVC requires minimal maintenance compared to traditional roofing materials like metal. Metals and galvanized roofs need regular painting or coating to prevent corrosion. But UPVC roof panels can save time and money in the long run.
This material makes a durable roof that can withstand harsh weather conditions, extreme temperatures, and mechanical stress without deteriorating. The longevity helps in preventing frequent repairs or replacements due to corrosion-related damages of acidic solution in leather factory roof and walls.
Sepidfam Varna Company manufactures corrosion-resistant and long-lasting uPVC roofs and walls. We provide reliable protection for your industrial buildings in years to come.
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