Chitra Thiyagarajan developed a unit that converts plastic waste into a fuel which is similar to diesel.she worked hard to find a cheap and sustainable fuel towards this innovation .she sustained three-year of effort. she was Guided by C S M Sundaram(80, a retired professor of St Xavier's College).she did series of tests in this 3years.
Finally perfected the device and applied for a patent In June 2013. "The patent authorities checked the machine for two months and verified that it could be patented. They accepted my application in August," Thiyagarajan said.
chithra explained 'pyro-plant' functions, she said, all plastics except PET bottles are put in a chamber and heated in the absence of oxygen over chromium micro band heaters (similar to those used in water immersion rods) to temperatures of between 350oC and 375oC. The gas generated passes into another chamber with a water coolants coils on two sides. It is then pumped into another compartment half-filled with water. The fuel floats on the surface. Non-soluble gas that passes into a condenser can be used as an LPG alternative.
The device is cheap(not expensive) and takes just three hours to generate fuel. A 5kg unit costs around Rs 75,000 and a 25kg variant, Rs3 lakh. Each kg of plastic produces 800ml of diesel. While the diesel can be stored, the LPG generated has to be used directly and cannot be compressed. "A similar process is used to generate fuel in China but the production costs are high and it is a time-consuming process," chitra Thiyagarajan said
night vision camera and an electromagnetic belt for physiotherapy are her other inventions.