CONSER, in collaboration with MOBIL RESEARCH, offers technology for the complete design (Basic Process Book) of Middle Distillate Dewaxing (MDDW).
CONSER has a leading position in design of MDDW units due to a strict cooperation with MOBIL RESEARCH starting from the first commercial application of the technology.
MDDW projects carried out by CONSER typically include the following:

• Process design of new units
• Revamping of HDS units to MDDW operation
• Revamping of HDS units to combined MDDW/HDS operation
• Design for gasoil feedstocks from Middle east crudes to high paraffinic crudes.

REFERENCES

Number of Projects	16
Number of Units	9
Capacity Range	From 3000 to 10000 BPSD

PROCESS DESCRIPTION

Fresh feedstock is mixed with treat gas and heated to reaction temperature by heat recovery and in a fired heater. The effluent from the MDDW reactor is cooled to the temperature required for the operation of a HDS reactor.
The HDS reactor effluent is partially condensed: the gas phase is separated, purified by an amine washing and recycled to the reaction section. The liquid phase is preheated and fed to a stripping column where an unstabilized naphtha stream is separated from a dewaxed desulphurized gasoil product.

 

CASE HISTORY

Project type:	New Unit	New Unit	Revamping
Capacity, MT/d	1400	1500	1600
Operation	MDDW	MDDW+HDS	MDDW+HDS
Gasoil feed	Lybic (High paraff.)	M. East	M. East
Results
Gasoil Yield, %	63	91	90
Desulphurization, %	-	97	92
Pour Point In, °C	+32	+34	+34
Out, °C	–18	–18	–18
Reactor diameter, mm
MDDW	3250	2500	2800
HDS	-	3000	2300
Op. Pressure, Kg/cm2g	25	40	58