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Catalytic dewaxing process

A catalytic dewaxing and dewaxing technology, which is used in the recovery of petroleum wax, cracking of hydrocarbon oil, processing of hydrocarbon oil, etc. It can solve the problem that the limited activity of the dewaxing catalyst is difficult to design and can handle all types of feeds.

Inactive Publication Date: 2012-09-19
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this is an expensive solution, the limited activity of existing dewaxing catalysts makes it difficult to design a single unit that can handle all types of feeds and still provide acceptably high throughput with high-wax feeds

Method used

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  • Catalytic dewaxing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The dewaxing catalyst used in this example consisted of 65% by weight ZSM-48 with a 90 / 1 silica to alumina molar ratio and 35% by weight ZSM-48 in the form of a 1.5 mm diameter by 3.25 mm length quadrulobe extrudate. Aluminum composition. This extrudate was steamed at 482° C. for 3 hours and then impregnated with 0.3% by weight platinum (in the form of tetraammine platinum nitrate salt). The catalyst was loaded into a vertical downflow reactor below the top layer of hydrotreating catalyst comprising 15 wt% Pt / Pd on alumina.

[0041] Four different feeds having the properties listed in Table 1, namely light neutral (LN) and heavy neutral (HN) slack waxes, and LN and HN hydrocracking products. in 1hr -1 The liquid hourly space velocity (LHSV), 419Nm 3 / m 3 Hydrogen circulation rate, 107kg / cm 2 The process is carried out at a pressure and an average reaction temperature adjusted to produce lube oil fractions having substantially the same pour point. The results are ...

Embodiment 2

[0046] This example is a hypothetical example using the dewaxing catalyst and process conditions of Example 1 to treat a similar set of feeds, but with higher levels of sulfur and nitrogen impurities. The operating temperature required to achieve the same 370°C + conversion as in Example 1 was calculated and the results are shown in Table 2.

[0047] Table 2

[0048]

[0049] Table 2 shows that, depending on the wax content of the feed, high sulfur and nitrogen levels can be tolerated using the catalyst of Example 1 at a nominal 365°C dewaxing temperature. Note that the conversion is the same in Example 2 as in Example 1, thus resulting in similar lubricating oil yields and properties.

Embodiment 3

[0051] In this example, the dewaxing catalyst of Example 1 was used to dewax two similar slack paraffin feeds that had been prepared with a conventional NiMo on alumina HDT catalyst, as specified in Table 3. Hydrotreating was previously carried out under similar conditions to that of , with temperatures adjusted to produce hydrotreated products with different sulfur contents.

[0052] table 3

[0053]

[0054] The resulting hydrotreated product was dewaxed to various pour points from -10 to -36°C using the dewaxing catalyst described in Example 1 and the results are shown in figure 1 and 2 middle. The feed properties for dewaxing are shown in Table 3 as "Product Properties" for the hydrotreatment step. figure 1 shows that pour points as low as -36°C can be achieved at reaction temperatures below 365°C, although slightly higher temperatures (approximately 5°C) are required to achieve the desired pour point for higher sulfur feeds . figure 2 It was shown that the effect...

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Abstract

In a catalytic dewaxing process, a catalyst comprising from 40 to 80 wt% of ZSM-48 having a silica to alumina molar ratio of less than 200:1 and from 0.3 to 1.5 wt% of a metal or metal compound from Groups 8 to 10 of the Periodic Table of the Elements is provided in a reaction zone. The catalyst is periodically contacted in the reaction zone under dewaxing conditions with a first hydrocarbon feedstock having a wax content of less than 50 wt% and with a second hydrocarbon feedstock having a wax content of 50 wt% or more.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application Serial No. 61 / 284,835, filed December 24, 2009, which is hereby incorporated by reference in its entirety. technical field [0003] The present disclosure relates to methods of catalytic dewaxing feeds having various wax contents. Background technique [0004] Waxy feedstocks can be used to prepare base stocks with high viscosity index (VI). However, in order to obtain a base stock with low temperature properties suitable for most applications, it is usually necessary to dewax the feedstock. Dewaxing can be achieved with the aid of solvents or catalytic dewaxing. Solvent dewaxing is a physical process whereby wax is removed by contact with a solvent such as methyl ethyl ketone followed by chilling to crystallize the wax and filtration to remove the wax. Catalytic dewaxing involves the chemical conversion of less desirable molecules to produce base stocks...

Claims

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Application Information

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IPC IPC(8): C10G47/12
CPCC10G2300/4018C10G45/64C10G45/62C10G65/043C10G2300/20C10G2300/202C10G47/12C10G73/02
Inventor C·N·伊利亚T·L·希尔伯特L·F·伯恩斯E·D·约瑟克J·T·金S·S·汉茨尔
Owner EXXON RES & ENG CO
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