Process control - by determining ratio between ammonia and carbon dioxide in process stream eg urea synthesis
- 专利权人:
- 发明人:
- 申请号：
- NL19700016336
- 公开号：
- NL7016336(A)
- 申请日:
- 1970.11.07
- 申请国别(地区):
- 荷兰
- 年份:
- 1972
- 代理人:
- 摘要：
Control of material and/or heat flows in a process, based on the proportion of the amounts of ammonia of carbon dioxide in a process gas stream or process liquid stream, is effected by (a) introducing a gas sample representative of the process stream in a relatively small amount of measuring liquid, which is in contact with a measuring electrode and a reference electrode, (b) measuring the potential difference between the electrodes, and (c) utilising the measured result as the magnitude for controlling the material and/or heat flows. Used in prepn. of urea from ammonia and carbon dioxide, prepn. of melamine from urea, and conversion of calcium nitrate into calcium carbonate.
- 来源网站：
- 中国工程科技知识中心
