CAUSTIC RECOVERY PLANT
CentPro is a leading manufacturer actively involved in developing advanced turnkey solutions for a wide range of industrial domains. Our expertise coupled with modern technological machinery and manufacturing unit has established CentPro as one of the best providers of advanced turnkey solutions.
The caustic recovery plant designed and developed by CentPro is predominantly a multi-effect evaporation plant. In the process of caustic recovery, the lye (caustic soda) is re-concentrated by subjecting it to heat in a heat exchanger. Further, when the lye reaches the evaporator, a significant amount of vapor is released as a result of water evaporation that eventually increases concentration.
How it works?
In a caustic recovery system, the caustic which is at low concentration is heated up to its boiling point from a heat-generating source. The vapor that is created due to the aforementioned process is then used to heat the liquor. The hot liquid is flashed at low pressure and the vapor that it creates is used again.
Benefits of a Caustic Recovery Plant
- The machine re-concentrates the weak caustic lye depending on the requirements of the process.
- The process uses fresh caustic only for make-up and concentration variation purposes.
- The energy generated from the steam can be converted to hot water.
- Cost-effective as far as neutralizing agents and water treatment cost is concerned.
- Sustainable for industrial use.
- Enhanced performance and minimum maintenance.
Applications
Knit Mercerizing
In the case of Knit Mercerizing, there are very few impurities that are present such as starch. Hence, due to the low presence of impurities, the caustic that has been recycled is pure as well. In addition, the caustic that has been recycled can be used for a longer duration prior to when the impurities reach a certain level.
Grey Mercerizing
In the case of Grey Mercerizing, it contains a lot of size in the liquor that is weak and thus the recycled caustic needs to be replaced frequently. In addition, it is hard to identify the source of the sizing material. To ensure that the caustic that has been recovered is usable, the viscous and lower GPL caustic has to be treated. In addition, the recovered caustic is dossed with fresh caustic in order to maintain its GPL.
Mercerising Process
To increase the tenacity of cotton fibre textile industries, adopt a process called mercerization cycle. The operation is carried out by using Sodium hydroxide which is also known by caustic soda. Cotton fiber or yarn rinsed with a solution of caustic lye which has concentration about 22 – 27%. Both the mature and immature cotton fiber will soak the lye. After the soaking process, there is a drastic change in the internal structure of the fiber. At the end of a mercerizing cycle, the fabric treated with water to reduce the excess caustic lye from the surface of the fiber. As, because of water wash the concentration of caustic lye goes on decreasing. This solution is termed is weak lye as it has concentration up to 6 -7%.
Most Industries discharge effluent from mercerizing process to ETP where a large amount of acid is utilized to make ETP effluent neutralized because of alkalinity nature of weak lye. Thus, it implies towards substantial loss of caustic soda.
Caustic Recovery Technique
Our designed Multiple Effect Evaporation plant will concentrate caustic from 6-7% up to 22% which can be reuse into mercerising process.
How it works?
A multiple effect evaporator system is used to recover caustic soda from effluent. In this unit operation effluent is passed through a series of multiple effect evaporator whereby application of steam; water gets vaporized and the remaining solute is of caustic which strong lye.
MCentpro Expertise offer following advantages:
- Efficient water recovery from vapour condensate
- Reduced TDS and COD of an effluent
- Heat recovery from hot water
- A decrease in the chemical consumption of ETP
- Acid consumption of ERP is reduced
- Decrease in transport cost due to a reduction in carbon footprint
- Caustic soda recovery from weak lye is around 90 per cent
Cent Pro is one of the most established and reputed caustic soda recovery plant suppliers in India. Our solutions are developed bearing in mind our client’s requirement and our team of highly accomplished and motivated experts leave no stone unturned to fulfill our client’s expectations.
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