Propane Deasphalting Research Articles

Исследование каталитического крекинга продуктов деасфальтизации гудрона

Within the frames of research on expanding of the Fluid Catalytic Cracking Process (FCC) feedstock base, a product of vacuum residue de-asphalting using n-pentane has been obtained. The properties of deasphalted oil have been analyzed: fractionaland hydrocarbon content, density, Conradson coking capacity, sulfur, nitrogen, vanadium and nickel content. For comparison, the estimation of the industrial product of propane de-asphalting has been performed according to the specified parameters. Both products as potential components of the FCC feedstock have been processed in a fluidized bed catalytic cracking unit.Indicators of the degree of conversion and yields of gaseous and liquid transformation products have been established. It is proved that propane deasphalted oil by its characteristics is a promising feedstock for the fluid catalytic cracking process. The productof vacuum residue de-asphalting with n-pentane can also be used as a feedstock component of the FCC process, but it is advisable to use it in a mixture with traditional types of feedstock such as vacuum gas oil.

Refinery bitumen and domestic unconventional heavy oil upgrading in supercritical water

Upgrading of three different bitumens from bottom of crude oil distillation columns, a type of bitumen from side stream of a propane deasphalting (PDA) unit and bitumen extracted from domestic tar sand samples was investigated in supercritical water (SCW). Coke suppression was highest for tar sand bitumens. Low vacuum residue (VR), high amounts of lighter ends, low aromatics and lower viscosity of the feed decreased coke yields even if there were high amounts of asphaltenes in the feed. At long reaction times, yields and selectivities were similar for different feeds. Red mud, Fluid Catalytic Cracking (FCC) spent catalyst, FeSO4, Fe2O3 and a blend of FCC spent and FeSO4 were investigated as catalytic additives. The coke yield was lowest with the FCC spent catalysts. Highest liquid yield was obtained using red mud. For all feeds, shot type cokes were obtained.

Effect of Delayed Coking Pressure on the Yield and Quality of Middle and Heavy Distillates Used as Components of Environmentally Friendly Marine Fuels

This paper includes the problem statement of obtaining environmentally friendly high-viscosity marine fuels, as well as a possible technological solution consisting in sequential oil processing in an atmospheric-vacuum unit, processing of the vacuum residue with or without preliminary deasphalting in a delayed coking unit, and subsequent compounding of middle and heavy distillates from the delayed coking unit with low-sulfur fractions. The research targets were tar and asphalt, which had been obtained from tar in the process of propane deasphalting. These residues were subjected to coking at 500 °C and a pressure of 0.15–0.35 MPa. Physical properties, chemical composition, and quantitative group hydrocarbon and trace-metal compositions (including vanadium and nickel) were determined for the feed and the obtained middle and heavy distillates. The possibility of applying the maximum amount of coking distillates to obtain environmentally friendly compositions of marine fuel with a sulfur content of up to 0.5...

Construction asphalt prepared by chemical treatment of deoiled asphalt

ABSTRACTThe 30# construction asphalt was prepared by chemical condensation of deoiled asphalt (DOA) from vacuum residue propane deasphalting in this study. It decreases the penetration and improves the softening point of DOA effectively based on the chemical condensation technology from experimental results. The group components of DOA were regulated through the addition of furfural extract oil dewaxed oil (DWO) with high content of aromatic components. Therefore, the ductility of condensed asphalt still meet the requirements of construction asphalt in the condition of decreased penetration and increased softening point. The 30# construction asphalt satisfies the standard requirements of the GB/T494-2010 by chemical condensation technology through the effective control of condensation degree with the appropriate blending proportion of DWO. The binary linear mathematical models of the properties of condensed asphalt have been established by regression analysis of the experimental data. This model had the high accuracy and excellent practical values. The properties of condensed asphalt could be accurately predicted and the construction asphalt production cost could be reasonably controlled. In addition, there was little change in the softening point of the construction asphalt pre and post thermal storage, which illustrated that the 30# construction asphalt obtained by chemical condensation of DOA has good thermal storage stability.

Use of Environmentally Friendly Plasticizers, Obtained by Propane Deasphalting, in Tire Rubbers

In view of tougher environmental requirements for plasticizers (Directive 2005/60/EC) and their widespread use in the rubber industry, we have studied the effect of environmentally friendly plasticizers on the properties of tire blends. We established that it is feasible to use plasticizers in commercial tire blends that have been obtained by propane deasphalting of solvent extracts. We showed that these plasticizers are a promising alternative to aromatic oils for the tire industry.

Valero–McKee refinery propane release and fire

AbstractOn February 16, 2007 a massive propane release occurred at the Propane Deasphalting Unit (PDA) of the Valero–McKee Refinery near Sunray, Texas. The resulting vapor cloud ignited, burning four workers, destroying the PDA, and causing significant knock‐on damage to adjacent pipe racks and equipment.The US Chemical Safety and Hazard Investigation Board (CSB) investigation determined that water trapped in a piping dead‐leg froze during cold weather, cracking a 10″ diameter liquid propane line, and causing the initial release when warmer weather returned. The CSB identified dead‐leg identification and management, freeze protection, emergency isolation capability, and structural steel fire protection as key issues contributing to the incident.Two near‐misses were associated with this incident; the release of over 2.5 tons of chlorine from containers adjacent to the PDA, and the inability of workers to access manual deluge valves protecting a nearby LPG storage sphere, which was impacted by the fire.The CSB made recommendations to Valero, the American Petroleum Institute, the McKee Refinery, and the United Steelworkers and their local. © 2010 American Institute of Chemical Engineers Process Saf Prog 2010

Influence of Asphaltenes on the Rheological Properties of Blended Paving Asphalts

Some of the refineries in India produce asphalt by blending propane deasphalting (PDA) pitch and heavy extract. This investigation reports the rheological and chemical characterization of various blends made with PDA pitch and heavy extract. The main objective is to develop an understanding on the influence of asphaltene change on the changes in the rheological properties under all aged conditions. Three blend proportions were manufactured using three different crude sources, and all the blends were subjected to short- and long-term aging. All the blends were tested for steady shear, creep and recovery, and stress relaxation properties. A chemical composition analysis of all the blended asphalt samples was carried out under all three aging conditions. It was seen that the proportion of PDA pitch considerably controls the rheological properties and that the kinetics of short-term aging are completely different when compared to long-term aging for blended asphalt.

Corrosion in Propane Deasphalting Unit in a Lube Producing Refinery: A Case Study

Propane deasphalting is a process of recovery of hydrocarbon distillates from vacuum residue by extracting with liquid propane. A plated tower is used to carry out extraction where extract containing the deasphalted oil and raffinate containing the asphalt are separated. Extract and raffinates are then subject to propane recovery sections wherefrom propane is recovered and reused in extraction. Complete recovery of propane from deasphalted oil is carried out by flashing alone, but recovery from asphalt requires heating in a furnace followed by flashing. Severe corrosion has been observed in the propane condensers, coolers, and the overhead lines of the flashers and stripper columns. Studies have indicated that cracking of asphalt at the prevailing operating temperature and pressure, generating hydrogen sulfide, was the sole reason for corrosion. The problem has been minimized by adjusting the temperature and pressure without affecting the propane recovery efficiency.

Improvement in procedure for propane and propane-butane deasphalting of petroleum resids

The total number of installations that provide for propane deasphalting of hydrone at Russian oil refineries is 23, of which 18 are active, and the remainder are in a conversion stage. A valuable product of the process is hard petroleum asphalt, which is used for the production of motor oils. The yield of the by-product – asphalt – ranges from 64-85% of the feedstock. The greater part of the asphalt is utilized extremely ineffectively. Domestic installations employed for the propane deasphalting of hydrone are inferior to foreign analogies with respect to specific energy expenditures. Research in the domain of improvement of the procedure employed for this process, which is directed toward a reduction in the consumption of energy resources, expansion of the assortment of products derived from the process, and development of new trends for their qualified application, is therefore urgently needed.

Production of paving asphalts from high-wax crude oils

High-quality BND 40/60 and BND 60/90 asphalts were made from high-wax Kotur-Tepe crudes with additives — heavy catalytic gasoil, hard asphalt from propane deasphalting, and extracts from selective treatment of oil feedstock — were manufactured in pilot conditions. Production of such asphalts by direct oxidation of vacuum resid is not possible. Optimum feedstock compositions are proposed.

Procedure for development of mathematical model of propane deasphalting process

Procedure for development of mathematical model of propane deasphalting process

Augmentation of raw material resources for obtaining aviation oils

1. The possibility of adding Peschanyi Island crude to the raw material resources (in a mixture with Surakhan and Karachukhur crudes) for obtaining aviation oils was shown. To obtain aviation oil, the concentrate from a mixture of the three crudes should be subjected to propane deasphalting; aviation oil may be obtained by using acid contact, selective, and adsorption methods of treatment. 2. It was established that the most profitable method for obtaining aviation oil is the adsorption method. This treatment method makes it possible to obtain oil with high antioxidation and corrosion-resistant properties, which are related to their lower content of tar substances. The yield of this oil amounted to 10.9% of the crude. 3. Deparaffination of the raffinate obtained from the concentrate of a mixture of the crudes studied should be conducted in a solution mixture of three solvents (acetone, benzene, and toluene).