Application And Research On The Processes Of Ammonia Purification For Sour Water Treating In Refineries

It is an important target of the petrochemical clean produce that raising the utilizedrate of nature resource and reducing the produced rate of polluted substance. The unit of ammonia purifying is important part for environmental protection in HVRDS plant, the gaseous ammonia will be purified by taked off sulfureted hydrogen, and made into liquid ammonia in the plant, it is a good way of protecting environmental. Because the quality of gaseous ammonia is changing in sour water stripped unit, it bring malfunction to the equipment running, such as cross pole and spring is splited many times. The ammonia purifying unit is shuttled down again and again. The quality of liquid ammonia can't attain to 99.6%, for there is some impurity in the liquid ammonia, such as water or lubricating oil. This paper studied the process of crystallization, adsorption, and ammonia purifying, it bring out a new way of produce liquid ammonia. Abstersion, crystallization, adsorption, and ammonia purifying are connected as a whole process, the united process can produce eligible liquid ammonia which concentration attain 99.8%. Because the Ammonia purifying process doesn't need gaseous ammonia compressor, of course, the lubricating oil of compressor doesn't disturb the quality of liquid ammonia, the workload of maintaining facility is reduced. Application of the preparation process is a good mean to improve the beneficial result on social and economic benefits for waste water stripping unit. The united process is flexible, simple, and clean. It will give us the profit for 1.65 million yuan. It is a valuable clean process for popularizing.