Hands on desulfurization resource

"As a general rule, the most successful man in life is the man who has the best information." -- Benjamin Disraeli
“Information is not knowledge.” -- Albert Einstein

A problem with any refining technology, including desulfurization technology, is getting it to work in a particular situation. When you run into a hands-on puzzle, it may be time to turn to colleagues who may have found a solution to your puzzle. Refining Online (www.refiningonline.com) provides a Q&A forum that helps you do just that. Registration is free. Here, as an example, is a recent exchange …

From the Refining Online Q&A Forum
Question No.: 5135 Category : Refining
Date Posted: 11/10/2009
Subject: Desalter
Question:
How step down of transformer will help us during water shot in desalter?
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Response 5135-1
Date : 11/11/2009
When you are processing high conductivity crudes, the current in the desalter will rise sharply & will near its trip point. During this time the voltage in the desalter will drop to nearly zero. As we know as per stokes law, a particular potential difference (voltage) has to be maintained for settling of water droplets. Hence we step down the transformer so that at least a small potential will be maintained across the water droplets for settling and step down of transformer also helps in avoiding tripping of the desalter due to high current.

Following the ROL Blog might also be useful. Here is a ROL Blog excerpt …

How FCC Feed Hydrotreating Affects FCC Yields And Economics
September 1, 2007 • 1 Comment
The following paragraphs show an example of the effects of hydrotreating ANS VGO on a typical FCC operation. The focus of the discussion is to compare FCC feed hydrotreating with FCC product treating as competing options for making low sulfur gasoline and diesel fuels.

Table 1 presents the properties of virgin ANS VGO and compares them with the properties of the VGO after severe hydrotreating (95% desulfurization). Hydrotreating increases the API gravity of the VGO by about 5.5 numbers, increases the aniline point by 10°F, lowers the nitrogen level by about 50% and lowers the VABP by 24°F. The VABP reduction is the result of a small amount of hydrocracking that occurs in the hydrotreater.

Source: http://rolblog.wordpress.com/category/refining-operations/

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