CONSER, in association with qualified suppliers of cracking furnaces, offers technology for the complete design (Basic Process Book) of Visbreaking/Thermal Cracking units.
The CONSER processes are supported by a relevant experience and know how in design of VSB/TC units and by a deep practical knowledge of the effect of the operating parameters.
In addition to the process design for new VSB/TC the units, projects carried-out by CONSER would typically include:

• Revamping and modernization studies
• Improvement of yield by recycle operation
• Troubleshooting (namely: fouling in column and heat exchangers)
• Operation with/without reaction chamber
• Experienced design of quench system
• Straight-run and cracked feedstocks for thermal cracking
• Atmospheric and vacuum residue feedstocks for Visbreaking

REFERENCES

Number of Projects	35
Number of Units	15
Capacity Range
VSB	From 2000 to 6000 MT/d
TC	From 1500 to 5000 MT/d

PROCESS DESCRIPTION

Feedstock is heated up to the required reaction temperature in a heater. Cracking occurs inside the coils of the heater and can be continued in a downstream reaction chamber. Steam injection to each coil of the heater is used to control velocity, residence time and to avoid coke formation.
Heater effluent quenching is provided by a stream of gasoil recycled from a
fractionation column where naphtha and gasoil are distilled off from fuel oil.

CASE HISTORY

Project type:	Revamping	New Unit	New Unit
Unit	VSB	TC	TC
Capacity, T/d	3400	2200	2400
Feedstock	V.R.	S.R.VGO	S.R.VGO
Operation	-	once-thru	Recycle
Distillate Yields, %	23	53	75