Q & A > Question Details
In distillation columns, why are trays more widely used than packings for vapour-liquid contact? What are the advantages of using trays over packings?
 
Answers
19/06/2018 A: keith bowers, B and B Consulting, kebowers47@gmail.com
PROPER selection of the size, physical shape characteristics, material of construction, and installation method as well as redistribution devices are all important in achieving good V/L contact. 'Experts' in this field are not as frequent. Incorrect material selection will cause poor liquid distribution, poor contact, and poor efficiency.
Proper tray design and installation details are important and more widely known. Trays can give lower HETP which reduces cost of the vessel. Trays generally will better respond to fluctuating liquid and vapor rates and maintain efficiency over a wider range.
02/06/2018 A: Sridhar Balakrishnan, Bharat Oman Refineries Limited , laksrid@yahoo.com
Advantages of tray over packings , they are cost efficient , can handle higher liquid flow rates, better at handling any source of fouling and trays allows upward moving vapors and downward moving liquids to have good contact.
01/06/2018 A: Sudhakara Babu Marpudi, Oman Refineries and Petroleum Industries Company, m_sudhakarababu@yahoo.com
in Simple terms, Trays are used where finer separation of products are the requirement. One can produce finished products (pretreatment level products) from tray towers. Packings are used where bulk separation (intermediate products that need further processing to produce finished products) are the requirement.
31/05/2018 A: Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
Trays were more reliable in predicting fractionation capability. It is easier to inspect a trayed column, often requiring dumping packing for inspection.