GPE in association with Carbotech Gas Systems GmbH, Germany offers cokeoven gas (COG) desulphurization and hydrogen generation plants which are required as utilities for continuous annealing lines in steel plants. These plants are used for removal of tar, naphthalene, ammonia and hydrogen sulphide from COG. The feed gas is first fed into a caustic wash tower, where bulk hydrogen sulphide is chemically converted using caustic soda. The gas then passes through adsorbent beds for tar and naphthalene removal. The balance hydrogen sulphide is removed upto 5 ppm by chemisorption process. Part of the cleaned gas is compressed and fed to a PSA unit to produce 99.99% pure hydrogen.