write true or false if false write the correct statement

16. The main method of separating ammonia is condensation method in the ammonia synthesis process. ( ) 17. For ammonia process, synthesis rate is about 80% and gas need to recycle. ( ) 18. N-olefins pyrolysis is most conducive to the formation of ethylene. ( ) 19. At present, (water steam) is not used as diluent for getting ethylene hydrocarbon cracking. ( ) 20For ethylene hydrocarbon cracking process, we should remove acid gas water and alkynes. ( )