corresponding block flow diagram such an integrated process offers one of the most attractive operation schemes since all of the co 2 generated in the combustion zone can be converted to useful synthesis gas thus minimizing the pollution while adding some value to a waste by product of this process and also it is quite an effective method of recovering the process waste heat computer simulation results based on such an integrated process scheme table 3 for the production of 167 000 t y ethylene plant also confirmed that the heat contained in the product gas after the in situ hydrogenation took place was sufficient to supply all of the endothermic heat required for the co 2 reforming reaction in which the co 2 recovered typically from the combustion gas reacts with methane in the presence of steam to become synthesis gas with the molar ratio of h 2 to co about 2 to 1 in addition to this the remaining heat was also found to be sufficient for preheating of feed streams as given in table 3 in this way the integrated process for the production of ethylene from natural gas thus becomes quite a special one with nearly zero pollution of carbon dioxide as well as the low grade heat an additional hydrogenation reactor may be added to this scheme in order to partly or.