Introduction
Two well-known names CMI Group , USA and Dalal Engineering, India have come together to offer perfect solutions in the field of Solvent Recovery. So you get the benefit of CMI’s established technological expertise and Dalal’s proven engineering skills.
CMI is a recognized leader in the fields of vapor phase solvent adsorption using activated carbon and solvent recovery. It has over 80 years of worldwide experience, and with thousands of systems in operation, helps companies recover millions of kilos of solvent/ VOC’s each year.
Known for its conservative engineering, quality equipment and services, and seasoned team of engineers, CMI provides design, engineering, equipment and installation of recovery systems, using activated carbon or zeolite adsorbents for solvent recovery and VOC emission control.
Dalal Engineering is a well known company that offers a variety of techonologies and machines to the various industrial segments. Our highly qualified team of trained engineers and partnerships with global leaders enable us to provide cutting edge solutions to the industry. Continuous innovation and advancement has been a hallmark of Dalal Engineering.
Our workshop near Mumbai is 5000 sq. m. large and has a work force with a cumulative experience of over 1000 man years.
At Dalal, we don’t sell machines, we provide solutions. Once you are a Dalal customer, we are completely at your service. So whether it’s a spare part you need or an entirely new machine, we are always there for you.
Dalal offers
- International cutting-edge technological solutions that are the most advanced in Asia.
- Customised creative and economical development of machines and auxiliaries
- Prepurchase counseling, validation through trials and service needs
- Superior process know-how, speedy execution, and exemplary after-sales service.
How it works
Dalal Solvent Recovery Plants are designed and constructed to the highest engineering standards and offer guaranteed performance. They provide continuous 24 x 7 automatically controlled operations both for large specially engineered installations or packaged units requiring only to be set down and connected to services. Dalal can recover solvent with up to 97% efficiency and eliminate air pollution hazards at the same time. The purity of the returned solvent is guaranteed.Dalal also offers a complete engineering service including detailed surveys for the evaluations of the economics involved in recovery and reuse of your solvent .
How it Works
Dalal uses the adsorption power of activated carbon (about 1,200 m2 of surface area per gram) to recover organic solvents.
The process
Solvent Recovery Process
The Solvent Laden Air (SLA) is conditioned (filtered and treated for temperature and humidity) prior to adsorption by passing it through the SLA Cooler (2) and SLA Re-Heater (3).
Recovery begins when the SLA Fan (4) passes the SLA through Adsorbers (5) of packed-beds of activated carbon. The solvents are retained in the activated carbon pores and the cleansed air is discharged into the atmosphere.
Through staggered adsorption and desorption cycles monitored by analyzers and computers, each bed is periodically regenerated by counter flow of steam or inert gas that heats the carbon.
During the regeneration phase, the solvent vapors are released from the carbon and carried by steam or inert gas to condensation (6), decanting and solvent treatment units.
Solvent treatment systems are custom designed to meet each client’s requirements. Decanters (11) are used for separation of solvent which are non miscible in water. Other cost effective processes and equipment include air stripping, steam stripping, and steam distillation.
Additionally the recovery efficiency can be improved by providing a Drying and Cooling unit (8,9, 10) after the regeneration before the next adsorption cycle.
Application
Application
Dalal processes are applied in many industries where organic solvents or VOC’s are emitted from a process or a manufacturing facility, such as:
| Adhesive Tapes | Carbon Copying Paper |
| Brake Linings | Chemical Products |
| Composite Gaskets | Packaging Industry |
| Industrial Belting | Pharma Products |
| Peroxide Manufacture | Pharmaceutical Products |
| Rotogravure Printing | Rubber Products |
| Surgical Bandages | Synthetic Leather |
| Tablet Coating | Weatherproof Sheeting |
With specific reference to those solvents most used and recovered industrially.
| Solvent | L.E.L. g/m3 |
| Ketones | |
| Acetone | 60.8 |
| M.E.K. (Methyl ethyl ketone) | 52.8 |
| M.I.B.K. (Methyl isobutyl ketone) | 57.6 |
| Esters | |
| Ethyl Acetate | 80.0 |
| iso-Propyl Acetate | 75.2 |
| n-Butyl Acetate | 67.2 |
| Alcohols | |
| Ethyl alcohol | 62.4 |
| Propyl alcohol | 51.2 |
| Isopropyl alcohol | 62.4 |
| n-Butyl Alcohol | 43.2 |
| iso-Butyl Alcohol | 51.2 |
| Hydrocarbons | |
| Heptane | 49.6 |
| Hexane | 43.2 |
| Toluene | 49.6 |
| Xylene | 43.2 |
| Halogenated Compounds | |
| Methylene Chloride | Nonflammable |
| Chloroform | |
| Trichloroethylene | |
| Freon | |
| Perchloroethylene | |
| 1.1.1. Trichloroethane | |
| Carbon Tetrachloride | |
| Esters | |
| iso-Propyl Ether | 54.4 |
| Tetrahydrofuran | 59.2 |
| 1.4 – Dioxane | 72.0 |
| g/m3 = grams solvent per cubic metre solvent vapour/air mixture at 20°C | |
Benefits
Suitable for range of air flows, variety of solvent types, and solvent loadings Very high emission control and recovery efficiencies of 95% and above.
Fully automated systems including PLC operations result in minimal manpower to operate the plant following full safety precautions.
Reuse of solvent reduces manufacturing costs resulting in attractive Pay Back Periods of about 2 years.
Packed bed Activated Carbon Solvent Recovery Plant helps comply with environment pollution control.
Helps combat global warming by recycling and reuse of natural resources.
Trial Facility
For Onsite Trials of Vapour Phase Solvent Recovery
We have now created a skid-mounted, scaled down working unit of SRP which can be carried to any site to conduct trials. We will also provide Installation, Commissioning and Training services for this plant.
The trial can give preliminary estimates for the following parameters for VOCs:
- Economics of Recovery
- Compliance with Emission Norms
- Quality of Recovered Solvent
The trial can help a company determine the feasibility of capturing volatile organic compounds.
