Solvent deasphalting pilot plant services (unit P73).
Solvent deasphalting is a refinery process for extracting asphaltenes and resins from heavy vacuum gas oil, atmospheric residue, vacuum residue, or other petroleum based materials to produce valuable deasphalted oil that otherwise cannot be recovered from the residue by other refinery processes. The deasphalted oil (DAO) can be used to make lubricants or can instead be used as feed to the fluid catalytic cracker, hydrocracker, or other refinery units.
The process consists of contacting the feedstock with a solvent in a counter-current extractor at temperatures and pressures to precipitate the asphaltene fractions which are not soluble in the solvent. Solvent selection and operating conditions are dictated by the desired product yields and qualities.
Unit P73 is a counter-current solvent deasphalting pilot plant that consists of a 8.5 m (28 ft) tall 304SS extractor column containing 161 alternating half-moon baffles spaced 5 cm (2 in) apart. The unit can co-process C3, C4, or C5 solvents (or blends thereof) and includes integrated asphalt and DAO and flash chambers to allow for the solvent to be recovered and recycled.
The core design specifications for P73 are as follows:
Feed Rate - Minimum
Feed Rate - Maximum
Extractor Temperature - Maximum
Extractor Pressure - Maximum
Additional attributes to note:
Analytical types and frequency are performed on an as needed basis to ensure that customers are getting only the data they need when they need it. Onsite and external analytical support options are available for characterization and unit control purposes.
In-house analytical support for unit control and external analytical support via the Intertek network of laboratories is as follows:
Common Project Types:
This unit has been used for both the generation of process data and also the production of samples (ranging from several liters to multiple drums) which can include:
Saudi Aramco Arab Light Crude Oil Hydroprocessing and Solvent Deasphalting Evaluation:
In the fall of 2013, Saudi Aramco contracted with Intertek Pilot Plant Services to perform hydrotreating and solvent deasphalting of whole Arabian Light crude oil. For the hydroprocessing, Intertek Pilot Plant Services’ Isothermal Precision Pilot Plant P87 with two 0.434 L reactors in series was employed. Various condition sets were targeted throughout the run to determine the optimal conditions for effective hydrodesulfurization of the Arabian Light crude. For the solvent deasphalting, Intertek Pilot Plant Services’ Light Hydrocarbon Solvent Deasphalting Pilot Plant P73 was employed. Saudi Aramco wished to evaluate the feasibility of rejecting the asphaltenes from the whole crude via deasphalting prior to distillation, hydroprocessing, etc. Both the hydrotreating and solvent deasphalting evaluations were successful in generating the important data required by Saudi Aramco, and Saudi Aramco was very pleased with the support Intertek Pilot Plant Services provided for their research and development needs.