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Process and Installation for the Treatment and Removal JIChEC06 The Sixth Jordan International Chemical Engineering Conference 12-14 March 2101, Amman, Jordan NEW PROCESSES FOR THE TREATMENT OF THE USED ALKALINE SOLUTIONS FROM MEROX AND EXOMER PLANT Florin Oprea*, Elena-Fendu Mirela, Marilena Nicolae, Octav Pântea Universitatea Petrol – Gaze din Ploieşti, Romania Bd. Bucureşti 39, 100491 Ploieşti, Romania *) [email protected] ABSTRACT potential to process these residues but to not affect In all modern refineries there are the the environment. desulphurization installations, used to remove the sulphur compounds from intermediate or finale There are many technological solutions for treating products of the refineries. These installations and removal of these residues, mostly are expensive generate the used alkaline solutions, relative diluted both in terms of investment cost and operating cost, (5-12%) and significant amounts of organic beside are operated at relatively high temperatures compounds which include mercaptans and other and pressures. This paper presents a simple and compounds organic with sulphur, naphthenic acids, economic variant for treating these alkaline used crezilic acids, beside a great variety of compounds solutions. It is perfectly adaptable for the present organic or inorganic. Also it may be present variable desulphurization installations from the romanian amounts of hydrocarbons which constitute a distinct refineries. phase. Present paper presents two new, simple, safe, The problem of the used alkaline solutions economically technologies. These processes are The desulphurization processes for removal of the integrated for acid consumption reduction. These compounds with sulphur being in the intermediate or processes do not use high pressure and/or finale products of the refineries are widely used in temperature for treatment. modern refineries. These installations generate the After treatment, the used solutions together with alkaline used solutions, relative diluted of sodium wastewater are ready to go to the waste water hydroxide (NaOH) or potassium hydroxide (KOH). treatment. The alkaline used solutions contain between 5 and The processes were verified at laboratory scale; 12% mass NaOH and significant amounts of organic based on the results obtained in laboratory were compounds which are corrosive, toxic or pollutants build industrial plants for used alkaline treatment. (sulphur, mercaptides and other organic compounds The industrial results confirm the viability of these with sulphur, naphthenic acids as naphthenates, technologies. cresylic acids as salts), beside a great variety of This process is subject of a patent demand (OSIM organic or inorganic compounds present in amounts A/00358/23.04.2010) that received a Gold Medal at more or less significant. Also can be present variable International Invention Fair in Middle East, Kuwait amounts of hydrocarbons which constitute a distinct City, November 2011. phase beside the alkaline solution. All of these solutions are considered residues as long as they INTRODUCTION are not taken by some others industries for These processes are applied for treatment and processing. It is obvious requirement generated be removal of used alkaline solutions from the the corrosive, toxic and pollution potential, to process installations for desulphurization of LPGs, Merox these residues, but in a manner that does not affect process, (Hydrocarbon Processing, 2006/1) and the environment. Gasoline Fractions, Exomer Process, (Hydrocarbon Processing, 2006/2). The refineries and petrochemical plants (for some time but more acute in the recent years) must face a In all modern refineries is present the problem of the severe control of all liquid and gaseous effluents, removal of the alkaline used solutions, relative which can cause the air and water pollution. Refinery diluted of the sodium hydroxide (NaOH) or industry has a historic experience on the utilization of potassium hydroxide (KOH), which result from the alkaline solutions for the treating of acids desulphurization processes for effluents or products, contaminants present on the products (hydrogen processes based on alkaline treating. It is evident the sulphide, mercaptans and organic acids). Even now desire generated by the corrosive, toxic and pollution alkaline solutions represents the primary agents for this processing because are certain, economic and efficient, and acceptable from point of view of the gases and liquefied gases (Hydrocarbon Processing, environment protection. The properly treatment of 2006/1) and the treating with EXOMER solution for these solutions is not representing a danger for the catalytic cracking gasoline (Hydrocarbon Processing, environment. A solution adopted by the most 2006/2). refineries in SUA and other countries is to deliver they to an another chemical units. This solution, as The advantages of the alkaline treating are: long as it’s treated by those beneficiaries, is not - economy: related with the increased of representing an object of the environment NaOH cost which was always below the regulations (Suarez, 1996). inflation rate [3]; - safety: the control of the alkaline solutions, The worries regarding these alkaline used solutions although aggressive, is easy than many are generated by: other chemicals; - most of the operators are not in cause of the - effectiveness and controllability: the conscience regarding the processing and the solutions are effective, easy to prepare, with reuse of these used solutions; corresponding pumping and control of the - improper process design for treating of the flow rate. Also, the solutions aren’t soluble in used solutions can cause problems in hydrocarbons, this allows an easy operating; separation of the two phases which have - used solutions can became danger residues different densities; accountable to the environment; - the alkaline used solutions management is - ungrounded worries regarding the simplified by the decision of several characterization of the alkaline solutions as companies to treat and to properly remove hazardous residues by the EPA and the used solutions in damage of their reuse. regarding the removal costs (3USD/gal). It is extremely important that every technological The reason that treatment with hydroxides solutions process and then the elimination process of the is used and at this present it is low cost versus residues to be properly evaluated. So: hydrotreating (investment costs of 10 - 12.5 times - the errors made in the design process lead smaller and operating costs of 5 – 22 times smaller). to increased costs and environment risks; We have to mention that the hydroxides solutions - mixing more types of alkaline used don’t represent an answer for all the petroleum solutions is not a good solution; fractions from refineries, especially for heavy one. - improper design of the storage tanks (most often undersized); The table 1 presents a comparison between the - treating more types of the used solutions in processing costs for the two solutions in case of the one installation, often designed only for treating a oil reactor. single type; - inadequate control of pH at neutralization. Table 1. Comparative costs of the investment and operating for the treating of oil reactor – jet fuel There are many alternatives solutions for treating to (10000 bpsd). remove these used solutions. The typical Treating with Hydro composition for alkaline used solution from the hydroxides treating treating of liquefied gases is presented in the table 2. Investment cost, 150 … 200 1500 … 2500 US $/bbl The components with a high pollution potential are: Operating cost, sulphide and sodium mercaptide. These determined US $/bbl a high chemical and biological oxygen consumption - catalysts and 0.0172 0.380 (COD and BOD) causing problems in the wastewater chemicals treatment stations and produce dangerous and smell - utilities 0.0005 0.025 gases at neutralization. - staff 0.0060 0.012 Total 0.0237 0.417 Table 2. Characteristics of typical used soda solutions. At present moment refinery gases, liquefied refinery NaOH free, % mass 2 … 10 (sometimes even gases and light gasoline contain H2S, RSH and COS or cresylic acids who are easily absorbed or more) extracted with alkaline solutions [Gary, 2001; Kohl, Na2S, NaHS as S, % mass 0.5 … 4 1997; Strătulă, 1984; Meyers, 2003, Bradley; 1992, Mercaptide as S, % mass 0.1 … 4 Suciu, 1983; Profile, 1995; Hydrocarbon Processing, Carbonates as CO3, % 0 … 4 2006). Between the existent treatment processes we mass can mention: (1) the MEROX process for the treating pH 13 … 14 Na total, % 4 … 10 - wet partial oxidation of the sodium Ammonium traces sulphide at sodium thiosulphate ; - wet total oxidation of the sodium sulphide Cresylic solutions from the treating of the catalytic at sodium thiosulphate ; cracking gasoline [2] come generally from two - deep neutralization up to reduced pH for processes: the elimination of H2S and mercaptans; - extraction and oxidation with strong - incineration; alkaline solutions; - chemical oxidation; - oxidation with weak alkaline solutions. - reuse in other areas of the factory, for example at gasoline treating; in this case The used solutions from the first case are sold at fair result a soda with a high value because and attractive prices, which often cover the transport the increase content of creslic acids; costs. These solutions contain at least 10% mass - use at DA installation or at the striping (often until 15%) phenol compounds respective acid-waters; cresols. By treating is recovered the valuable phenol - sending
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