ethylene urea
2.Rough calculation of investment: 1) methyl carbonate: total investment is RMB100 million yuan; investment return period is 4 years. 2) Granular dry ice powder: total investment is RMB31 million yuan; investment return period is 2 years. 3) Salicylic acid: total investment is RMB25 million yuan; investment return period is 3 years. 4) Sodium carbonate: total investment is RMB50 million yuan; investment return period is 3 years. 5) Ethylene urea: total investment is RMB60 million yuan; investment return period is 4 years.

