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The dewaxing reactor is a vertical apparatus with axial flow of feedstock. The scheme of the reactor is presented in Fig. 3. Download : Download high-res image (439KB) Download : Download full-size image; Fig. 3. Catalytic dewaxing reactor.
Hydroprocessing reactor for catalytically dewaxing liquid petroleum feedstocks. Patent number: 4604261 Abstract: A hydroprocessing trickle reactor construction which will facilitate the catalytic dewaxing of liquid petroleum or lube feedstocks in a highly efficient and economical manner, particularly through the use of reactors employing .
Shell RTCA, Dept. GSCT/5, P.O. Box 38000, Amsterdam, BN, The Netherlands, 1030. Corresponding author. Search for more papers by this author
Reactor temperature is adjusted to control product fluidity and compensate catalyst aging. . dewaxing catalyst with hydrotreating catalysts were introduced. Figure 3 below shows different possible process applications. In combining dewaxing catalysts with hydrotreating, it .
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Catalytic Dewaxing. Although included under the separation processes, catalytic dewaxing is actually a low-severity conversion process involving a selective catalytic cracking of n-paraffins. Because of removing wax (long chain n-paraffins) by chemical reaction, the process is called dewaxing. The selective cracking of n-alkanes takes place in .
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Various grades of MIDW catalyst exist to suit unique refinery needs: catalysts for sweet or sour drop-in applications, as well as catalysts for standalone dewaxing reactors. MIDW catalyst grades are tailored to meeting refineries' specific cold-flow specifications. .
A North American refinery revamped a two-reactor HDS/ dewaxing unit with a history of rapid dewaxing catalyst deactivation that led to high-temperature operation and reduced diesel yields. During the revamp, the refinery changed the service of the lead reactor to another application, leaving only one reactor for HDS and dewaxing.
Catalytic isomerization and dewaxing is a special kind of hydrocracking. used to make high-quality lube base stocks. This topic is well-covered in . adding a reactor and a high-pressure amine .
The highly selective dewaxing catalyst is used in a separate reactor and takes the place of the solvent dewaxing unit in the original MWI design. MWI-2 The MWI-2 catalyst can very effectively .
ExxonMobil innovation in diesel dewaxing. Collaborate with us today. catalysts-licensing.com Example processing schemes Not to scale. L0518-101E49 Winter Optional R2 bypass Quench Quench High activity HDT beds High activity HDT beds HDT reactor HDT reactor MIDW reactor MIDW catalyst bed MIDW Not to scale.
Usually the catalyst pellets are housed in a cylindrical reactor. For a given volume of catalyst, many combinations of bed diameter and bed length are possible. The ratio of catalyst bed length:diameter is called the 'aspect ratio'. A high aspect ratio produces high linear gas velocity, high tortuosity (contact with many active pgm catalyst .
Mar 11, 2009 · Abstract The selective cracking of long-chain normal paraffin's of medium neutral raffinate, derived from a lube oil-phenol extraction unit, by the catalytic dewaxing technique over H-ZSM-5 and NiMo-H-mordenite catalysts was studied. The runs were conducted to produce lube oils with acceptable cold flow properties. The influences of zeolite types, metals loading, and operating reactor .
Catalytic dewaxing is a process that ensures that oil products like diesel are liquid at the specific temperature ranges in which they are to be used in order to meet the cold flow requirements essential for the commercial success.
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Catalytic dewaxing has the advantage that it actually converts the "bad" molecules in the distillate — those with poor cold flow properties (the wax) — to better molecules. This technology has been deployed since the 1970s. Catalytic dewaxing As the air temperature drops, the wax naturally found in diesel begins to form crystals and .
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Feb 04, 1986 · A reactor for catalytically dewaxing a waxy distillate consisting of a lubricating oil or liquid petroleum feedstocks utilizing a shape-selective crystalline aluminosilicate zeolite catalyst in order to obtain a lubricating oil having a low pour point and a high viscosity index, and particularly, a hydroprocessing trickle reactor construction for catalytically dewaxing liquid petroleum feedstocks.
In order to design such a fixed bed reactor, it is necessary to be able to predict the temperature and concentration at every point in the reactor, since present design methods are based on the numerical integration of basic differential equations which can be derived from material and energy balances over a differential element of the bed.
the stage of dewaxing. The unstable hydrogenate (product of dewaxing reactor) is sent to stabi-lization column, followed by distillation and obtaining the main products (Fig. 1). The industrial catalytic dewaxing reactor is a vertical vessel with axial feed load and the inner diameter of 4000 mm, height of 13760 mm.
Sep 23, 2014 · FIG. 5 shows a plot of reactor temperature versus the pour point of the total liquid product (TLP) from the reactor. As shown, the lower surface area binder of Example 2 provides a dewaxing catalyst with higher dewaxing activity than the high surface area binder of Example 1.
CLG's ISODEWAXING technology revolutionized catalytic dewaxing when it was commercialized in 1993. Rather than removing the wax, as does solvent dewaxing, ISODEWAXING® catalytically isomerizes the molecular structure of the wax into isoparaffins. These isoparaffins have high VI, low pour points and excellent resistance to oxidation.
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Sep 23, 2014 · FIG. 5 shows a plot of reactor temperature versus the pour point of the total liquid product (TLP) from the reactor. As shown, the lower surface area binder of Example 2 provides a dewaxing catalyst with higher dewaxing activity than the high surface area binder of Example 1.
Catalytic dewaxing is conducted under conditions which only slightly differ from those employed during conventional hydroprocessing. Typically, catalytic dewaxing is carried out in the trickled-bed reactor over either a bi-functional, zeolite catalyst or in the fixed-bed comprising several reactors and/or layers/sections of different catalysts.
The improvement of catalytic dewaxing reactor model for the production of diesel fuel was arranged. The formalized scheme of the reactions proceeding in the reactor was advanced by applying the results of thermodynamic calculations in the Gaussian software package.