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Thermal Adsorption Processing of Hydrocarbon Residues Journal of Catalyst and Catalysis ISSN: 2349-4344 (Online) Volume 4, Issue 1 www.stmjournals.com Thermal Adsorption Processing of Hydrocarbon Residues Guliaeva N.I., Sudad H. Al* Department of Mining, Uppsala University, Uppsala, Sweden Abstract The raw materials of secondary catalytic processes must be prerefined. Among these refining processes are the deasphalting and demetallization including their thermo adsorption (or thermo-contact adsorption) variety. In oil processing, four main processes of thermo- adsorption refining of hydrocarbon residues are used—Asphalt Residual Treating- residues deasphaltizing (ART), Discriminatory Destructive Distillation (3D), developed in the US; Adsorption-Contact Treatment (ACT) and Express Thermo-Contact Cracking (ETCC), developed in Russia. ART and ACT are processes with absorbers of lift-type reactor, while 3D and ETCC processes are with an adsorbing reactor having ultrashort contact time of the raw material with the adsorbent. In all these processes, refining of hydrocarbon residues is achieved by partial thermo-destructive transformations of hydrocarbons and hetero-atomic compounds with simultaneous adsorption of the formed, on the surface of the adsorbents, resins, asphaltene and carboids, as well as metal-, sulphur-, and nitro-organic compounds. Demetallized and deasphalted light and heavy gas oils or their mixtures are a quality raw material for secondary deepening refining processes (catalytic and hydrogenation cracking, etc.), since they are characterized by low coking ability and low content of organometallic compounds that lead to irreversible deactivation of the catalysts of these deepening processes. Keywords: Demetallization, deasphaltization, adsorbent, hydrocarbon residues, lift-reactor *Author for Correspondence E-mail: [email protected] INTRODUCTION The long-term trend and the most promising As adsorbents, granular and powdered solid direction of development of world oil refining materials are used. In the processes of thermal- is to improve the refining processing of raw adsorption refining asphaltite does not form, as materials up to 98–100%. This task can be it is formed during the solvent deasphalting performed only by recycling heavy oil and gas- process. In modern oil refining there are four condensate residues to deepen various catalytic well-known process of thermo-adsorption processes (catalytic cracking, hydrocracking, refining of hydrocarbon residues—Asphalt hydro-conversion, etc.). However, the catalysts Residual Treating- residues deasphaltizing of these deepening processes are extremely (ART), Discriminatory Destructive Distillation sensitive to catalyst poisons (organometallic, (3D), developed in the US; and Adsorption- sulphur, nitrogen-containing, resin-asphaltic Contact Treatment (ACT) and Express and other compounds) contained in raw Thermo-Contact Cracking (ETCC), developed materials. Therefore, the raw materials of in Russia. recycled catalytic processes should be previously refined. The oil refining includes VARIETIES OF THE BASIC deasphaltization and demetallization processes, PROCESSES OF THE THERMAL including their thermo-adsorption (or thermo- ADSORPTION REFINING contact adsorption) species. Refining Processes Using Lift-Reactors (enriching) of hydrocarbon residues in these One of the first processes of these varieties, processes is carried out by thermo-destructive developed in the oil industry, is the Asphalt transformations of hydrocarbons and hetero- Residual Treating (ART) process, which is a atomic compounds and the adsorption of the combination of the process of partial formed resins, asphaltenes and carboids, as well evaporation of raw materials and its as metal-, sulphur-, and nitro-organic decarbonisation and demetallization in a compounds on the surface of adsorbents [1–3]. JoCC (2017) 6-10 © STM Journals 2017. All Rights Reserved Page 6 Thermal Adsorption Processing Guliaeva & Sudad fluidized layer of adsorbent. Industrial work mixture of light and heavy gas oils is a high- with capacity of 2.5 million tons/year for the quality raw material for catalytic cracking, in implementation of this process was put into which the yield of benzene reaches more than operation in the United States in 1983. 42% [1]. Technology of ART process largely resembles The process Adsorptive Contact Treatment the technology of catalytic cracking process (ACT) was developed in Russia, in the All- with lift-reactor, but there is an additional unit Union Scientific Research Institute for oil for the cleaning of flue gases, of adsorbent refining during 1980–1990. The technology, regeneration, from sulphur oxides. The pressure hardware design and effectiveness of this of this process is about 0.1–0.2 MPa, the process are quite similar to ART process. temperature is 450–550 °C. Natural fine-grained kaolin The raw material evaporates in the lift-reactor (Al2O3·2SiO2·2Н2О) is used as an adsorbent with a minimum conversion that allows which in its characteristics is close to the keeping the hydrogen atoms in liquid products. fluidized bed cracking catalysts, but has Thermolabile resinous-asphaltene part of raw minimal catalytic activity, low specific surface materials is adsorbed with partial thermal area and increased affinity for coke and metals. degradation. The adsorbent, after steam treatment of the hydrocarbons, is regenerated The process is carried out by the mass feed rate, by burning coke and recycled into lift-reactor in for the raw material, of 20/h, with a contact time which the contact time of the raw material and of 0.5 sec and a reactor temperature of 520 °C. the adsorbent is slightly less than the contact Solid fine-grained adsorbent is circulated time of the raw material and catalyst on the between the reactor and the regenerator. In the catalytic cracking. reactor, upon the contact with adsorbent solid particles, the light components of the raw Vanadium and nickel content in the adsorbent material are vaporized, and the resinous- reaches up to 30 g/kg. The spent adsorbent is asphaltene compounds containing metals, discharged into the dump, but if necessary and sulphur and nitrogen, are deposited on the for economic feasibility may be used for the surface of these particles. Some of the high extraction of vanadium and nickel. As an molecular components of the raw material are adsorbent with the trade name "ARTKAT" [4], subjected to cracking to form lighter products a microspherical inert adsorbent based on and coke. Coked adsorbent is steamed off in the kaolin with a low specific surface area (about desorption zone of the reactor and transported 15 m2/g) is used. This adsorbent has a good to a regenerator where it undergoes oxidative affinity for metals, and asphaltenes. It should be regeneration. noted that this adsorbent is expensive. Furthermore, in the process of operation, it is The process of ACT is characterized by a low subject to destruction due to the presence of yield of hydrocarbon gas and benzene (5–6% large coke deposits, the burning out of which and 6–8%, respectively) and high yield of gas must be carried out at high temperature. oil fractions (about 80%). From heavy oil, heavy metals are removed by 95–98%; total Operating experience of ART method has sulphur by 35–45%; total nitrogen by 50–60%, shown that the processing; for example, of the and coking is reduced by 75–80% by weight. black oil of heavy Arabian crude oil gives total The output of coke is up to 125% of the coking output of light and heavy gas oil of about 70%, capacity of raw materials of Conradson. Heavy hydrocarbons gases C3-C4 3–8%, benzene 13– gas oil and a wide gas oil fraction with a coking 17%, and coke 10–12%. Total sulphur removal rate of 3% and 2.5%, respectively; and a rate reaches upto 30–50%, but nitrogenous residual content of heavy metals 1.4 g and 1.1 compounds and organometallic compounds are g/ t appear to be, after preliminary 35–50% and 95%, respectively. Coking ability hydrotreating, high quality catalytic cracking of raw materials is reduced by 65–75%. A result feedstock. Light gas oil after the hydrotreating of realization of the refining process process may also be involved in commercial (deasphaltation and demetallization) for a diesel fuel. The used adsorbent allows complete JoCC (2017) 6-10 © STM Journals 2017. All Rights Reserved Page 7 Journal of Catalyst and Catalysis Volume 4, Issue 1 ISSN: 2349-4344 (Online) elimination of the emissions of sulphur oxides adsorbent, which leads to the increase in the from gases regeneration—their residual content yield of undesirable products (coke and low is only 20 mg/kg. molecular weight gases) [8]. Moreover, a broad porous microspherical adsorbent based on In the regenerator, metal sulphates are formed, kaolin (process ART) and powdery kaolin and then sulphur is reduced in the contactor (process ACT) has low mechanical strength [7]. reactor to hydrogen sulphide, the content of which in the gas process reaches 5% [5]. Processes Using Reactors with Ultra-Short Contact Time Other adsorbents can also be used in this These processes include the process process [6]; for example, powdered petroleum Discriminatory Destructive Distillation (3D), coke and pellets of iron ore. However, which was developed by firm "Barco" (USA). petroleum coke has low strength and very low It is a hard thermal adsorption cracking in a porosity, so it quickly breaks down and poorly reaction system with an ultra-short contact time adsorbs metals from raw materials. Iron ore of the circulating adsorbent with the heated pellets
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