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Process for producing sweet gas for poor-quality gasoline distillate

A technology of inferior gasoline and distillate, applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problems of unqualified mercaptan sulfur and reducing sulfur content, etc.

Active Publication Date: 2008-11-19
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
[0011] In order to make the mercaptan content of the final gasoline product qualified, oxidation deodorization is generally used as the last process of gasoline treatment, but the oxidation deodorization process only changes the form of sulfide, and does not reduce the sulfur content

Method used

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  • Process for producing sweet gas for poor-quality gasoline distillate

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] This example prepares a kind of highly active MoO by step-by-step impregnation method 3 (13.0wt%)-CoO(4.0wt%)-P 2 o 5 (1.5wt%)-K 2 O-(2.0wt%) / Al 2 o 3 catalyst.

[0039] Take by weighing 1000g pseudo-thin water aluminum hydroxide powder (Al 2 o 3 Dry basis content is 78wt%), adding accounted for Al 2 o 3 Dry basis 5wt% squash powder extrusion aid, mass concentration 10% nitric acid aqueous solution 200ml, mix and roll and mix into plastic powder, use extruder to prepare cylindrical strips with a diameter of 1.5mm, dry at 120°C 8 hours, calcination at 500°C for 5 hours to prepare a catalyst carrier;

[0040] Press Catalyst on P 2 o 5 The content is 1.5wt%, K 2 O content is 2.0wt%, take quantitative phosphoric acid, potassium nitrate, add deionized water, be made into 120ml impregnating solution, then, spray on the above-mentioned catalyst carrier of 160g. P 2 o 5 (1.5wt%)-K 2 O-(2.0wt%) / Al 2 o 3 Catalyst intermediate.

[0041] MoO on Catalyst 3 The co...

example 2

[0043] This example 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.

[0044] The catalyst carrier was prepared with reference to Example 1.

[0045] 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 deionized water, be made into 110ml impregnation liquid, then, spray on the above-mentioned catalyst carrier of 165g. Drying at 120°C for 8 hours and calcining at 500°C for 4 hours prepared MoO 3 (3.0wt%)-CoO(1.0wt%)-K 2 O(2.0wt%) / Al 2 o 3 catalyst. 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.

[0046] The physical property of table 1 example 1~instance 2 catalyst

[0047] project

[0048] Specific surface area, m 2 / g

example 3

[0050] This example shows the desulfurization effect of inferior FCC gasoline.

[0051] (1), raw oil sweetening

[0052] The sweetening oxidant of feedstock oil adopts commercial AFS-12 catalyst (purchased from Petroleum University), at a pressure of 0.5MPa, a temperature of 35°C-45°C, and a volume space velocity of 2.0h -1 , Gas-oil volume ratio (air / catalyst) 4:1 for deodorization.

[0053] (2) Cutting of raw oil light distillate and heavy distillate

[0054] With 50°C as the cut point temperature, FCC gasoline is separated into 50°C heavy fraction. Table 2 lists the properties of FCC gasoline, 50°C heavy fraction.

[0055] Properties of FCC gasoline, light ends and heavy ends in Table 2 Example 3

[0056] project

[0057] (3) Hydrodesulfurization of heavy fractions >50°C

[0058] The evaluation tests were carried out on a fixed bed reactor setup charged with 50 ml of a high activity HAC and a low activity LAC catalyst. The volume ratio of the former to the l...

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Abstract

The invention discloses a method for producing low-sulfur gasoline by inferior gasoline fractions. Firstly, full-range inferior gasoline raw material is oxidized and deodorized by a fixed bed, mercaptan sulfur is transformed into disulfide, then an oxidized and deodorized product is fractionated into light cut and heavy cut, the heavy cut is subject to the selective hydrodesulfurization through combining high-activity / low-activity and hydrodesulfurization catalyst, and a desulfurization product is mixed with the light cut to produce a clean gasoline product. Compared with the prior art, the method can effectively desulfurize the inferior gasoline fractions and has less octane number loss at the same time; under the preferable condition, the sulfur content of the gasoline product can reach less than 10 mu g / g.

Description

technical field [0001] The invention relates to a method for deep desulfurization of inferior gasoline fractions to produce clean gasoline, in particular, the invention relates to a process for demercaptanization and hydrodesulfurization of inferior gasoline fractions. 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 Class 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%. Europe plans to implement "sulfur-free gasoline (ULSG)" with a sulfur content of less than 10μg / g in 2009 new standard. The U.S.EPA Tier 2-II standard stipulates that the sulfur content of American clean gasoline after 2006 is ≯80μg / g, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/12
Inventor 赵乐平方向晨尤百玲王继锋关明华段为宇刘继华李扬
Owner CHINA PETROLEUM & CHEM CORP
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