Q&A on Purification Technology [048]
Thread Content
What is the purpose of pre-washing? It is to remove large amounts of gaseous light oils, ammonia, water, hydrogen cyanide, unsaturated hydrocarbons, and high-boiling-point impurities from the raw gas, so as to prevent them from entering the main washing stage and causing methanol contamination, which could affect absorption and regeneration processes. Coal chemical industry purification technology – 2017: “My Technical Upgrades” in the coal chemical sector (with generous rewards) http://bbs.hcbbs.com/thread-1786290-1-1.html Registration for chemical engineers – “Learning from Others’ Experiences” event http://bbs.hcbbs.com/thread-1808158-1-1.html
Remove gaseous light oils, ammonia, water, and high-boiling-point impurities from the raw gas to prevent methanol contamination
The purpose of pre-washing is to remove water-soluble stains and some solid stains; therefore, pre-washing dirtier clothes not only improves the cleaning effect but also saves detergent.
First, use a small amount of methanol to remove light oils and high-boiling hydrocarbons, and then use a large amount of methanol to remove H2S; this is done to prevent impurities such as light oils and high-boiling hydrocarbons from entering the system and contaminating the methanol, thereby avoiding deterioration in system operation. Furthermore, different approaches are needed for different substances that are absorbed; by handling them separately, the difficulty of processing can be reduced.
The large amounts of gaseous light oils, ammonia, water, hydrogen cyanide, unsaturated hydrocarbons, and high-boiling-point impurities present in the raw gas are removed, so as to prevent them from entering the main washing section and causing methanol contamination, which could affect absorption and regeneration processes.
The large amounts of gaseous light oils, ammonia, water, hydrogen cyanide, unsaturated hydrocarbons, and high-boiling-point impurities present in the raw gas are removed, so as to prevent them from entering the main washing section and causing methanol contamination, which could affect absorption and regeneration processes.
Due to the tension of water, plain water alone is not sufficient to wet dirt; for fabrics with particularly severe dirt contamination, some wetting agents (emulsifiers) are added to help wet the dirt
The large amounts of gaseous light oils, ammonia, water, hydrogen cyanide, unsaturated hydrocarbons, and high-boiling-point impurities present in the raw gas are removed, so as to prevent them from entering the main washing section and causing methanol contamination, which could affect absorption and regeneration processes.