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Process for removal of nitrogen containing contaminants from gas oil feedstreams.

A technology for feed streams, petroleum, applied in the direction of chemical apparatus and methods, refining to remove heteroatoms, refining hydrocarbon oils, etc.

Inactive Publication Date: 2006-03-15
WR GRACE & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heavy distillate materials, such as diesel fractions, have not been successfully processed in a cost-effective and efficient manner to remove the nitrogen and sulfur-containing impurities normally contained to produce environmentally friendly products

Method used

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  • Process for removal of nitrogen containing contaminants from gas oil feedstreams.
  • Process for removal of nitrogen containing contaminants from gas oil feedstreams.
  • Process for removal of nitrogen containing contaminants from gas oil feedstreams.

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Preparation of silica-zirconia adsorbent

[0094] Silica-zirconia cogels were prepared using a mixing nozzle capable of co-currently introducing two liquid streams and then passing the introduced liquids through a tortuous channel capable of providing rapid flow mixing. Sodium silicate aqueous solution (analysis: 24.2% SiO 2 , 7.5% Na 2 O) Import the mixing nozzle at a rate of 29.5L / hr, and simultaneously introduce the sulfuric acid solution (analysis: 30.7%H) dissolved with original zirconium sulfate at a rate of 10.5L / hr 2 SO 4 ; 3.2% ZrO 2 ). Upon leaving the mixing device, a silica hydrogel with zirconium metal as Lewis acid promoter formed within 11 minutes. 2500 parts of the resulting hydrogel were washed by passing 2100 parts of water maintained at 60° C. within one hour. This washing step was repeated three more times. After the last wash, the resulting hydrogels were sequentially processed as follows:

[0095] (a) treatment with a first solution of 103 ...

Embodiment 2

[0105] Preparation of alumina modified silica adsorbent

[0106] Four samples of spray-dried silica gel containing aluminum atoms in its backbone to impart Lewis acidity were prepared as follows.

[0107] IIA. By first adding sodium silicate (analysis: 24.2% SiO 2 , 7.5% Na 2 O) by silicate / H 2 O ratio of 0.15 was dissolved in water heated to 85°C to prepare a water-soluble silica sol. The silica sol is mixed with carbon dioxide at such a rate that the gel time of the silica sol is 10 to 30 seconds. This mixing process takes place through a tubular reactor capable of intimate mixing of the materials. The gel was further mixed in reactant water for about 140 minutes to complete the development of the gel structure. The gel was then pumped into a static mixer while the aluminum sulfate solution was added at a silica / alumina ratio of 28 / 5. Due to the change in pH, carbon dioxide gas escapes from the gel mixture. The resulting alumina-silica hydrogel was dehydrated at 200°C...

Embodiment 3

[0112] Preparation of Aluminum Hydride-Titania Adsorbent

[0113] An aqueous solution having an aluminum content of 15% by weight was prepared by adding aluminum isopropoxide to water maintained at a temperature of 85°C for 10 minutes for hydrolysis. The resulting suspension was incubated at 85°C for 20 minutes. The material was then peptized by adding titanium tetrachloride in isopropanol. The resulting material was heat-dried at 200° C. for 20 hours to prepare an alumina-titania cogel.

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Abstract

The present invention is directed to the removal of nitrogen and sulfur containing impurities from high molecular weight petroleum feedstock obtained from fluid cracking catalyst or distillation zone of a petroleum treatment plant. The present process comprises first treating C12 and higher hydrocarbon petroleum feedstock having nitrogen and sulfur containing compounds therein with a porous, particulate adsorbent comprising a silica matrix having an effective amount of metal atoms therein to cause the adsorbent to have Lewis acidity of at least 500 mol / g and then treating the resultant feedstock to catalytic hydrodesulfurization to produce a hydrocarbon fuel having low sulfur and nitrogen content.

Description

field of invention [0001] The present invention relates to a process for the preparation of petroleum fuels, in particular diesel oil, substantially free of nitrogen and sulfur compounds. In particular, the method involves heating the boiling point range from about 125 to 560°C (preferably C 12 or higher hydrocarbon fractions) are treated with inorganic oxide adsorbents with very high Lewis acidity prior to conventional catalytic hydrodesulfurization. This required pretreatment readily removes nitrogen-containing compounds from the feed and allows the hydrodesulfurization reaction to proceed more efficiently, producing petroleum products with reduced nitrogen and sulfur content. Background of the invention [0002] The problem of environmental pollution, especially the degradation of air quality, has become a matter of great concern all over the world, especially in industrialized countries. This concern has led to environmental regulatory policies to impose stringent qual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/06C10G45/02B01J21/08B01J20/16C10G25/00
CPCC10G67/06C10G25/003B01J20/16B01J21/08C10G45/02
Inventor M·F·M·莱斯曼C·泽策尔
Owner WR GRACE & CO
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