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Question No.:  5878 Category :  Refining Operations
Date Posted:  2/15/2017
Subject: How to detect the leak source in DHDT unit?
 
Question:
WABT of DHDT reactor increased significantly in the last two months, (358 Deg C to 372 Deg C) when blocked at 10 ppm ULSD production, all operating parameters seem "OK" during the period, and we analyzed some unusual sulfur species (DBT) at 10 ppm product. My questions are:

(1). Could anyone share any experience on detecting leakage issue in DHDT unit? What are the good practices to detect leakage?
(2). What kind of sulfur species shall not exist in 10 ppm ULSD? I would like to know the indicator of leakage evidence.
Submitted by :
Name:
Company Name:
Location:
EMail:

Wang Tzu Hong
Formosa Petrchemical Corporation
Yunlin
424606@rffpcc.com.tw


 

Number of responses : 1
Response 5878-1
Date : 2/17/2017

The sulfur species which can remain in 10 ppm of Ultra low sulfur diesel would be benzothiophenes, dibenzothiophenes and 4,6-dimethyldibenzothiophene, because they are most difficult to be removed by hydrodesulfurisation. Sulfides, disulfides, hydrogen sulfide, thiols and other sulfur compounds can be removed. Broadly aryl sulfur compounds are toughest to be removed.

Name - Sridhar Balakrishnan
CompanyName - Nagarjuna Oil Corporation Limited
Location - Cuddalore, Tamil Nadu, India
Email - laksrid@yahoo.com

 




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