Hello…Experts !! Happy New Year to all of you !!
LVGO –Light Vaccum gas oil is one of the product from Vacuum crude distillation column , high Total chloride especially inorganic chloride is reported , while checking at overhead receiver boot water chloride it remains only 1 or 2 ppm , while LVGO chloride data shows total chloride 15 ppm ,20 ppm some times 23 ppm , it varies from 5 ppm to 25 ppm ; out of which organic chloride is very less say , e.g. out of 20 ppm , 16 ppm is inorganic and rest is organic , desalter efficiency remains ~ 98 % ,LVGO draw temperature is 130 to 140 C; LVGO Return temp. is ~ 40 C ; NH4Cl Desublimation temp. delta online monitoring is there but it shows more than 20 C delta difference, lab analysis shows no presence of Fe,Zn,Al metals & absence of amine,ammonia chloride or not even Na,Ca ; It sounds to be HCl.Caustic dosing in upstream crude unit is ~ 200 to 300 lph.One thing which was observed that , whenever NH3 demands goes up in VDU Column ovhd (Dosing as per Overhead reciver boot water pH), chloride in LVGO goes down ;
What are the potential cause of this chloride ? It is very critical point of concern because this LVGO goes to VGO hydrotreater and it can cause sever corrosion in the downstream.
Thanks in advance to all of you.
LVGO –Light Vaccum gas oil is one of the product from Vacuum crude distillation column , high Total chloride especially inorganic chloride is reported , while checking at overhead receiver boot water chloride it remains only 1 or 2 ppm , while LVGO chloride data shows total chloride 15 ppm ,20 ppm some times 23 ppm , it varies from 5 ppm to 25 ppm ; out of which organic chloride is very less say , e.g. out of 20 ppm , 16 ppm is inorganic and rest is organic , desalter efficiency remains ~ 98 % ,LVGO draw temperature is 130 to 140 C; LVGO Return temp. is ~ 40 C ; NH4Cl Desublimation temp. delta online monitoring is there but it shows more than 20 C delta difference, lab analysis shows no presence of Fe,Zn,Al metals & absence of amine,ammonia chloride or not even Na,Ca ; It sounds to be HCl.Caustic dosing in upstream crude unit is ~ 200 to 300 lph.One thing which was observed that , whenever NH3 demands goes up in VDU Column ovhd (Dosing as per Overhead reciver boot water pH), chloride in LVGO goes down ;
What are the potential cause of this chloride ? It is very critical point of concern because this LVGO goes to VGO hydrotreater and it can cause sever corrosion in the downstream.
Thanks in advance to all of you.
