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Gasoline modification method

A gasoline and upgrading technology, applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problems of accelerated coke formation, less loss of octane number, poor adaptability to different raw materials, etc., so as to slow down coke formation and prolong operation. Period, avoid the effect of condensation coke

Active Publication Date: 2015-02-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its advantage is that it does not need fractional distillation to process full fraction FCC gasoline. The disadvantage is that most of the residual sulfur compounds in the final product are mercaptan sulfur compounds, which leads to unqualified mercaptan sulfur in the product
However, fixed bed oxidation deodorization will cause gasoline components to contact with oxygen, which accelerates coke formation, which is not conducive to the long-term operation of the device
[0010] In the existing technology, the main problem of FCC gasoline production of low-sulfur clean gasoline products is that several contradictions cannot be solved at the same time, such as the contradiction between desulfurization depth and octane number loss, sulfide removal and sulfur removal under hydrodesulfurization conditions. The contradiction between alcohol generation, deodorization and desulfurization, etc., make it impossible to obtain clean gasoline products with low sulfur, less octane loss and qualified mercaptan at the same time with existing technology
In addition, the prior art method has poor flexibility and poor adaptability to different raw materials, which is not conducive to long-term operation of the device

Method used

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  • Gasoline modification method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0061] This example uses the step-by-step impregnation method to prepare a highly active MoO 3 (13.0wt%)-CoO(4.0wt%)-P 2 o 5 (1.5wt%)-K 2 O-(2.0wt%) / Al 2 o 3 catalyst.

[0062] Weigh 1000g pseudo-thin water aluminum hydroxide powder (Al 2 o 3 Dry basis content is 78wt%), adding Al 2 o 3 5wt% squid powder extrusion aid on a dry basis, 200mL of a 10% nitric acid aqueous solution, mixed and rolled to form a plastic powder, and a cylindrical strip with a diameter of 1.5mm was prepared with an extruder, and dried at 120°C 8 hours, and calcined at 500° C. for 5 hours to prepare a catalyst carrier.

[0063] Press Catalyst on P 2 o 5 The content is 1.5wt%, K 2 The O content is 2.0wt%. Take quantitative phosphoric acid and potassium nitrate, add deionized water to make 120mL impregnation solution, and then spray it on 160g of the above-mentioned catalyst carrier. P 2 o 5 (1.5wt%)-K 2 O (2.0wt%) / Al 2 o 3 Catalyst intermediate.

[0064] MoO on Catalyst 3 The content i...

example 2

[0066] This example uses the co-impregnation method to prepare a low activity MoO 3 (3.0wt%)-CoO(1.0wt%)-K 2 O(2.0wt%) / Al 2 o 3 catalyst.

[0067] The catalyst carrier was prepared with reference to Example 1.

[0068] MoO on Catalyst 3 content of 3.0wt%, CoO content of 1.0wt% and K 2 O content is 2.0wt%, take quantitative ammonium molybdate, cobalt nitrate and potassium nitrate, add the deionized water of 16% ammonia content, make 110mL dipping solution, then, spray on the above-mentioned catalyst carrier of 165g. The low-activity catalyst was prepared by drying at 120°C for 8 hours and calcining at 500°C for 4 hours. The catalyst is referred to as LAC, and the specific surface area and pore volume properties of the catalyst are shown in Table 1 by low-temperature nitrogen adsorption BET method.

example 3

[0070] This example prepares a sweetening catalyst.

[0071] 95.6 grams of copper nitrate and 235 grams of zinc nitrate were prepared into 2000 milliliters of working salt solution, 170 grams of oxalic acid was prepared into 3000 milliliters of precipitant solution, and its pH value was adjusted to 3.0, and then added to two parallel high level tanks respectively Heat to 20°C, when the water bath in the low-level sedimentation tank is heated to 20°C, start the agitator, and under strong stirring, the two solutions flow into the sedimentation tank within 30 minutes, and then age for 0.5 hours under weak stirring, and then put The precipitate was emitted, filtered, and dried overnight to obtain a co-precipitate filter cake, which was dried at 110°C for 8 hours, then raised from room temperature to 360°C in 6 hours, and roasted at a constant temperature of 360°C for 4 hours to obtain the catalyst precursor. Then add an appropriate amount of graphite, mix evenly, and press into ta...

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Abstract

The invention discloses a gasoline modification method. The method comprises: subjecting the gasoline light fraction fractionated from a catalytic cracking distillation tower lateral line to fixed bed oxidation deodorization, converting mercaptan into a disulfide, mixing the deodorized product with thermocatalytic diesel oil, subjecting the mixture to fractionation in a prefractionator so as to obtain light fraction and diesel oil fraction; carrying out a hydrogenation pretreatment on heavy fraction obtained from an FCC (fluid catalytic cracking) fractionating tower, removing unstable diene and mercaptan, then performing selective hydrodesulfurization through high activity / low activity combination, and mixing the desulfurization product with the deodorized light fraction so as to obtain a clean gasoline product. Compared with the prior art, the method disclosed in the invention can produce the clean gasoline product with a sulfur content of less than 10 micrograms / g and an octane number loss of not greater than 1.5 units. Meanwhile, the colloid generated by oxidation deodorization and the coking precursor generated by diene under a high temperature can be prevented from influencing normal operation of hydrogenation equipment, thus prolonging the equipment operating cycle. The method provided in the invention has the advantages of wide raw material adaptability and flexibility, mature technology, and high reliability.

Description

technical field [0001] The invention relates to a method for upgrading gasoline, in particular, the invention relates to a method for producing ultra-low sulfur gasoline while avoiding device coking and prolonging the operation period of the device. Background technique [0002] Reducing the sulfur content of gasoline can greatly reduce the emission of harmful substances in automobile exhaust. Therefore, the new standards of clean gasoline in various countries in the world have put forward stricter and stricter restrictions on sulfur content. The European Category IV vehicle exhaust emission standard (EU2005 standard) stipulates that after 2005, the sulfur content of gasoline is ≯50μg / g, and the olefin content is ≯18v%. After 2009, the new standard of "sulfur-free gasoline (ULSG)" with a sulfur content of less than 10μg / g will be implemented . US U.S.EPA Tier 2-II standard stipulates that the sulfur content of American clean gasoline after 2006 is ≯80μg / g, and the olefin co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/00
Inventor 尤百玲关明华赵乐平庞宏牛世坤房莹
Owner CHINA PETROLEUM & CHEM CORP
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