Oil dewaxing

Sources. Methyl ethyl ketone (MEK) is used in some r neries as a solvent in lube oil dewaxing. Its extremely volatile characteristic makes fugitive emissions its primary source of releases to the environment. 

Wax Manufacture A waxy distillate cut from crude or the wax byproduct from lube oil dewaxing is first deoiled. Resulting low oil content wax is hydrofmed for color improvement and fractionated into appropriate melting point grades. 

Solvent dewaxing Treatment Cool/filter Remove wax from Inbe stocks Vacuum tower lube oils Dewaxed lube base stock... 

MEK also is used as the solvent in lube oil dewaxing, wood pulping, and toluene (see Chapter 3), and in the manufacture.of printing ink and rubber-based industrial cements. 

Lube oil dewaxing agent. By-product in MIBK production. Oxidation catalyst. 

Most of the catalytic interest in the AlP04-based molecular sieves have centered on the SAPOs which have weak to moderate Bronsted acidity, and two have been commerciahzed SAPO-11 in lube oil dewaxing by Ghevron and SAPO-34 in methanol-to-olefins conversion by UOP/Norsk Hydro. Spurred on by the success of TS-1 in oxidation catalysis, there is renewed interest in Ti, Co, V, Mn and Cr substituted AlP04-based materials, for a review of recent developments in the AlP04-based molecular sieves see [35]. 

MEK is used for coatings solvents (62%), adhesives (12%), magnetic tapes (5%), lube oil dewaxing (5%), and printing inks (3%). 

Lube oil dewaxing -use of methyl ethyl ketone m [KETONES] (Vol 14)... 

R.M. Gould and A.R. Nitsch, Lubricating Oil Dewaxing with Membrane Separation of Cold Solvent, US Patent 5,494,566 (February 1996). 

Solvent applications account for almost 95 percent of all MEK consumption the rest goes to chemical uses such as MEK peroxide and methyl ethyl ketoxime. The solvent applications include surface coatings, adhesives, lube oil dewaxing, magnetic tape manufacture, and printing inks. Production of MEK in 1999 totaled almost 690 million lb. 

This paper describes the investigation of the deactivation of Ni0/Al203-t-Ni,H-ZSM-5 catalyst systems and the contribution of the method of nickel incorporation to the performance of the catalysts. We made use of Y-AI2O3, because with that support the rate of aging in Ni/alumina catalysts was found to be the lowest [1]. The activity experiments described here involved n-hexane conversion and diesel oil dewaxing. 

Figure 9. The TPO profiles of spent catalysts, (a) AZ-2 and (b) AZ-1 (b) after diesel oil dewaxing.

The TPO results for spent catalysts after diesel oil dewaxing reveals only one temperature form of the deposit on Catalyst AZ-2 and two for catalyst AZ-1 (Fig. 9). In the lower activity catalyst AZ-1, the high-temperature carbon form accoimted for less than 50 % of the total. It was also found that the amount of the deposit on Catalyst AZ-1 was greater than on Catalyst AZ-3 (7.6 wt. % and 5.9 %, respectively), even though the time of deposition for Catalyst AZ-1 was only one-fourth that for Catalyst AZ-3. 

FIGURE 6.7 Normal and non-normal paraffin distributions in a waxy 100N feed to dewaxing. Source R. J. Taylor and A. J. McCormack, Study of Solvent and Catalytic Lube Oil Dewaxing by Analysis of Feedstocks and Products, Ind. Eng. Chem. Res., vol. 31, pp. 1731-1738 (1992). With permission. 

Source Urea-Adduct Process Gains Ground in Lube-Oil Dewaxing, Chemical Engineering 114—118 (November, 1956). With permission. 

M. P. Ramage, K. R. Graziani, and J. R. Katzer, Science and Application of Catalytic Lube Oil Dewaxing, presented at the meeting of the Japan Petroleum Institute, Tokyo, October 27-28, 1986. 

F. A. Smith, Mobil Lube Oil Dewaxing (MLDW) Technology, presented at the Texaco Lubricating Oil Symposium, May 18, 1982. 

ATO and AFO type structures. At present the industrial process of lube oil dewaxing (ChevronTexaco) is realized on bifunctional catalyst with acidic SAPO-11 (AEL) component. Few examples in the literature devoted to comparative study of AEL-, ATO- and AFO-SAPO materials in hydroisomerization reaction are based on a single specimen of each catalyst, sometimes not phase-pure and often prepared by exotic or undefined method. Recently the authors found a new method for selective and reproducible synthesis of SAPO-31 (ATO type structure) materials in the presence of di-n-pentylamine and showed hydroisomerization efficiency of catalysts based on these systems [3,4]. 

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