In order to study on the mechanic behaviour of the joint-pylon of the cabel-styed bridge with separate twin prestress girders and a united twin-pylon.

The poisoning accident of catalyst of ammonia synthesis in combined methanol production has been discussed from the aspects of the complete set of equipment capacity, effect of methanol and dimethyl ether on catalyst of ammonia and economic operation of combined methanol production etc.

Author introduced the process for poisoning trouble of ammonia synthesis catalyst caused by combined methanol production with ammonia synthesis, in allusion to analysis made for the unfavoured influence caused on ammonia synthesis of the injurious gases after-methanol gas, the result shows that the sulfur in the raw gas of methanol has the promoting action for forming the dimethyl ether.

Its use in ammonia-methanol coproduction has resulted in prolonged service life of methanol synthesis catalyst and thus better econonhc benefit.

The used methanol co-production process catalysts were taken out from different positions in the commercial reactor.

Rotation reasons and its harms of the inner parts of methanol tower are introduced.