Published Paper Details:

Sulphur is treated as an impurity which has huge impact on the production cost of ammonia It is a poisoning element for steam naphtha reforming catalyst it should be removed from raw naphtha having maximum 1500 wt ppm sulphur. Sulphur removed from naphtha is done by two sections one is pre-desulphurisation and followed by Final desulphurisation. In the pre-desulphurization process, the organic sulphur compounds are removed from the naphtha by catalytic conversion to hydrogen sulphide which is then separated from the naphtha by distillation. The hydrogenation and stripping process is included as a primary processing step in the NFCL plant,kakinada to remove the bulk of the maximum 1500 wt ppm sulphur in the naphtha feed up to 2-10 ppm sulphur. The predesulphurisation process does not yield sufficiently low sulphur concentration in the feed to prevent poisoning of the steam naphtha reforming catalyst, thus a final desulphurization must also be performed.The sulphur content in the outlet of final desulphurized gas is 0.1 ppm by volume it is achieved by two beds of ZnO Absorption. And here I am present the brief operation of pre-desulphurisation ,Final desulphurisation. In the present project work, to study the various catalysts to remove sulphur from naphtha and catalysts handling ,best performance, operating conditions& poisioning of catalysts are studied.