urea medium
1.This paper has technical and economic analyses about urea capacity enlargement from 60 kt/a to 100 kt/a by modifying main units of 60 kt/a total solution recycling urea plant, such as CO 2 compressor, liquid ammonia pump,primary ammonium aminoformic pump, urea converter and medium and low pressure absorption and decomposition systems.
4.OPTIMIZE OPERATION TO DECREASE AMMONIA LOSS FROM MEDIUM PRESSURE AMMONIA ABSORBER OF UREA PLANT
6.Some domestic medium-sized and minityped Urea-manufacturing devices are still adopting the traditional manufacturing technology of full-circulation with water solution, which has such problems as high energy-consumption, flammability and explosive of the waste gas.
7.The suitable medium for the enzyme production was composed of 7% Jerusalem artichoke extracted juice,2% urea and 3% corn steep liquor. The optimal cultivation temperature and initial pH for the enzyme production were 30 ℃ and 5-6 respectively. Under these conditions,a maximum inulinase activity of 1 403 u/ml was obtained after 24 hours of growth in shake cultures.
