Catalyst for oxidation sweetening of diesel oil and application thereof

Abstract

The invention relates to a catalyst for oxidation sweetening of diesel oil and an application thereof. The catalyst has the expression as QrBmHn[AxMyOz](r+m+n)-; in the expression, Q represents quaternary ammonium salt cations and is constituted by R1R2R3R4N+, R1, R2, R3 and R4 represent saturated alkyls of C1-C20 in which at least one carbon chain length is larger than or equal to 4 carbon atoms; B represents metal cations; H represents hydrogen atoms; A represents one of B, P, As, Si and Al elements; M represents the metal elements W and Mo; and O represents oxygen atoms, wherein r+m+n is equal to or less than 14, r is equal to or less than 10 and equal to or larger than 1, m is equal to or larger than 0 and equal to or less than 3, n is equal to or larger than 0 and equal to or less than 3, x is equal to 1 or 2, y is equal to or larger than 0 and equal to or less than 18, and z is equal to or larger than 34 and equal to or less than 62.The catalyst used for preparing low sulphur diesel mainly comprises the following steps: mixing the catalyst QrBmHn[AxMyOz] (r+m+n), aqueous hydrogen peroxide solution and diesel oil, reacting for 10min-5h under the temperature of 30-60 DEG C, standing or centrifugalizing to recovery the catalyst and obtain the oxidized diesel oil, and removing sulphone and / or sulphone sulfocompound from the oxidized diesel oil by an extracting or distilling method to obtain the low sulphur diesel of the sulphur content is less than 10ppm.

Description

technical field [0001] The invention relates to diesel oxidation desulfurization, in particular to a catalyst for diesel oxidation desulfurization and its application. Background technique [0002] Sulfur oxides (SO X ) can not only cause acid rain, pollute the air, endanger human health, but also cause irreversible poisoning of the three-way catalyst of the engine exhaust gas purification system, so it has attracted widespread attention. The refining of distillate oil is an essential and important process in petrochemical industry. It is to remove heteroatoms such as sulfur and nitrogen in fuel oil to meet the needs of environmental protection. The traditional refining process is hydrofining, which converts organic sulfides and organic nitrogen compounds into hydrogen sulfide and ammonia through hydrogenation, so as to achieve the purpose of removing sulfur and nitrogen. Although the traditional hydrofining process is effective, there are still many problems as follows: 1...

AI Technical Summary

Problems solved by technology

Although the traditional hydrofining process is effective, there are still many problems as follows: 1. Large investment; in addition to building high-temperature and high-pressure treatment equipment, hydrogen production equipment (if there is no hydrogen reforming), sulfur recovery equipment, etc.

2. Due to the high temperature and high pressure hydrogen consumption involved in the processing process, the processing cost is relatively high; 3. Due to the generation of highly toxic hydrogen sulfide during the processing process, it will inevitably cause environmental pollution

4. Hydrofining can effectively remove non-thiophene sulfides in diesel oil, but it is very difficult to remove thiophene sulfides, especially benzothiophene, dibenzothiophene and their derivatives

"Because the catalyst used in this method is a solid adsorbent insoluble in fuel oil, it can only be dissolved in chlorinated hydrocarbons (such as dichloromethane), which is not environmentally friendly due to the high toxicity of chlorinated hydrocarbons

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