RODINE 213 – Acid inhibitor for Hydrochloric Acid

Most metal hot working processes tend to leave a discoloring oxide layer or scale on the surface. Deposition of inorganic impurities, stains, rust and scales from ferrous, cuprous, aluminium and precious metal mostly as oxides hinder with further processes like extrusion, rolling and galvanizing. In jewellery making, soldering and annealing processes leave metal oxide residue that prevent polishing of ornaments. Such impurities are cleaned with the help of diluted solution of acids. The method is called pickling and the workpiece is dipped in a vat of acid solution popularly called “Pickle Liquor”.

Hydrochloric acid replaced the commonly used Sulfuric acid as the pickling liquor because it pickles much faster with minimum base metal loss. The aggressive chloride ion in the acid is the key to high efficiency in the cleaning process. It is used for cleaning metals with an alloy content of 6% or less. An acid inhibitor must be added to the pickling solution to prevent the metal from dissolving or becoming pitted. Such a pickling acid solution is called “Inhibited HCL” and is a blend of Hydrochloric acid solution in water (3% to 10%) and an acid corrosion inhibitor which in itself is a blend of organic compounds that adsorb on the metal surface during pickling.

Rodine 213 is a premium organic blend of keto-amine complex substitutes with non-ionic surfactants, alcohol and solvents especially designed to inhibit attack of hydrochloric acid on metal surfaces during industrial operations like cleaning and pickling. It is effective over a wide range of metal surfaces like Iron & Steel, copper and brass. Rodine 213 is a high foaming formulation with a high efficacy at dispersing grease deposits and is ideal for HCL based pickling liquor solutions especially prior to plating.

It ensures metal surface protection during processes involving elimination of lime deposits from boiler and pipework and from evaporating plants, removal of oxide deposits from iron, steel, brass and copper. Rodine 213 is free from chlorinated hydrocarbons and heavy metals like arsenic and lead. It can be synergized with Hydrochloric acid pickling in stipulated concentrations both by circulation method and by soak and rinse method. Rodine 213’s exceptional strength and commendable heat stability makes it an ideal acid inhibitor during enhancement of the pickling process by pre-heating the equipments with the inhibited acid solution. It also acts as a strong acid fume suppressant.

Its key features can be summarized as follows:

• Modifies  metal surface to prevent corrosion
• Easy to use
• Excellent wetting properties for better cleaning
• Effective fume suppression
• Saves Zinc in galvanizing (Plating)
• Reduces metal loss
• Enriches strength of pickling acid bath, and reduces acid consumption

Rodine 213 has widespread industrial application in industries such as Iron & Steel, Power Station, Heavy Engineering Industries, Petrochemical & Refineries, Sugar Processing Industry, Cement, Glass & Ceramic Industries to name a few.

Anionic Polyacrylamide (APAM): Industrial Wastewater Management

Industrial wastewater containing suspended organic solids pose a threat to the aquatic biota when discharged untreated in surrounding water bodies. The issue has become one of dire concern with increasing variation in nature and type of solids associated with the effluent. One promising method to treat such wastewater conveniently is using flocculants to remove the suspended solids before discharging the water. An ideal choice for this is using polymer based flocculants that are cost friendly and easy to use over a wide range of suspended solids.

Flocculation is the process by which individual particles of a suspension aggregate. They consist of anionic, cationic and nonionic polymers of varying molecular weight. They are used to increase the efficiency of settling, clarification, filtration and centrifugation operations. They adsorb on particles and cause destabilization by bridging or charge neutralization. Most common polymer used in water treatment is made from Polyacrylamide. Polymers are given anionic character by copolymerizing acrylamide with acrylic acid.

Anionic PAM series products are polymer used in water treatment that are water soluble linear chained synthesized polymers that are insoluble in other common organic solvents. They have valuable properties like flocculation, thickening, shear properties, drag-reduction and dispersibility. Thus they are widely used in environmental protection practices for the treatment of industrial wastewater containing suspended matter; mostly coarse with high concentration of positively charged particles under neutral or alkaline pH conditions.

Synthetic polymeric flocculants like APAM have become very popular in industrial effluent treatment owing to their natural inertness to pH changes, high efficiency even with low dosage, and easy handling. They are the widespread choice as waste water treatment chemicals for industries such as Iron & Steel, Electroplate factory, Metallurgical workshops, coal washing etc.

Features:

Criteria	Benefit/Activity
Application	Organic-based wastewater
Treatment ability	Suspended and colloid particles
Treatment Process	Simpler, no pH adjustment needed
Sludge generation	Less sludge produced, may contain monomer residue
Treatment cost	Less expensive
Mechanism	Charge neutralization and concurrent bridging
Removal efficiency	TSS: 100% removal COD: 55% removal BOD5: 23% removal

 

APAM is most commonly available as Polyacrylamide powder and has been tested to show no toxicity to even sensitive aquatic species even at much higher concentrations than used in industry thus ensuring zero environmental setbacks from tail-end runoffs into natural water bodies. ChemEqual, the largest chemical marketplace gives the opportunity to buyer to compare and buy chemicals and equivalents.

Descaling Chemical

Scaling is the precipitation of dissolved impurities in untreated water on the equipment walls. This may lead to buildup of hard water mineral film coats on the surfaces of heat exchangers, cooling towers, boilers & pipelines reducing their efficiency and safe operation of the heating elements. It may result in localized heating along the hot spots leading to tube failures inside pressure boilers and progressive lowering of boiler efficiency by forming an insulative layer. On an average, a 0.4mm thick deposit can reduce boiler’s efficiency by 18.2%.

Scaling is mainly due to calcium and magnesium salts because their solubility is inversely related to the water temperature and silica concentrations.  They are mostly classified as limescales most of these being Carbonates and Sulphates. Carbonate scales are granular, porous and dense uniform on the surface while Sulphate scales are harder, brittle and more compact in nature. Another type of scaling is associated with High Silica deposits that are hard, dense and impervious. They are hard to remove owing to inertness against acids. Contrary to these, Iron scale deposits are mostly due to corrosion or iron contamination in water that oxidizes the metal parts of the equipment.

Descaling chemical or is used to remove mineral scales from metal surfaces in contact with hot water, such as in boilers, heat exchangers etc. It is the best alternative to mechanical descaling owing to its ease of use and application methods. It is a high end superior protection to industrial equipments from scaling.

Acid washing is the only satisfactory method for removing mineral scales. Typical descaling chemical compositions include individual or a proportionate blend of mineral acids like Hydrochloric, Sulphamic, Hydrofluoric, Phosphoric, Formic and Citric acids along with applicable corrosion inhibitors and chelants. Descaling Chemical is more of a broader term and it may include application directed products such as Condenser Descalant , Heat Exchanger Descalant, , High Silica Descalant, Silica Scale Remover and Passivation Chemicals.

Liquids are more preferred in the market because of features like

• precise pH correction,
• application over wide boiler pressure range
• multipurpose descaling
• ease of use

Industrial descaling chemicals can be customized for offline descaling, online descaling and immersion descaling based on the nature of scale and system concerned. These chemicals are even suitable for descaling equipments in sensitive industries like pharmaceuticals, oil refineries, power plants, food and beverage industries. The need for chemical cleaning during the lifetime of the equipment has become a recognized fact & should be accepted as a routine maintenance practice. Frequencies of service cleaning depend on the Water Chemistry and Operation conditions.

ChemEqual is a vast online chemical B2B marketplace and various grades, brands of application specific descaling chemicals can be searched here.