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Complex sulfurization and denitrification method for distillate

A distillate oil and denitrification technology, applied in the direction of refining with metal salts, only multi-stage serial refining process, etc., can solve the problems of difficult sulfur removal, harsh reaction conditions, low selectivity, etc., and achieve oil stability Improvement, mild reaction conditions, and simple process

Inactive Publication Date: 2011-02-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oil produced by this method is of good quality and high yield, but there are the following problems: the reaction conditions are very harsh, generally requiring an operating pressure of about 4.0MPa, and a temperature of 320-370°C. The high-pressure method even requires a pressure of 10MPa; the hydrogenation unit Large investment and high operating costs lead to a sharp increase in the cost of oil products
At the same time, the experimental results also show that it is difficult to remove sulfur to 400×10 by complex extraction. -6 (w) below
[0011] Although there are many desulfurization and denitrogenation methods reported in the existing literature on distillate complexation extraction, there are generally problems such as large amount of complexing agent, low selectivity and difficult regeneration, and the desulfurization and denitrogenation processes are often studied separately, which increases the practical complexity

Method used

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Examples

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Effect test

example 1

[0019] Straight-run gasoline with a sulfur content of 1197 μg / g and a basic nitrogen content of 29 μg / g is taken as raw material oil, and the sulfur and nitrogen elements / AlCl 3 The mass ratio of H is 0.048, H 2 O / AlCl 3 The mass ratio is 0.10, and 0.766gAlCl 3 1. Add 0.076g of water into 30.0g of straight-run gasoline, seal the container, stir and heat up to 60°C, and react for 50min. After the reaction is finished, let it stand for 20 minutes, take the upper oil phase and add 1.0% volume of water to wash to obtain refined straight-run gasoline. The refined oil has a sulfur content of 32 μg / g and a desulfurization rate of 97.3%; a basic nitrogen content of 0 and a denitrification rate of 100.0%.

example 2

[0021] Straight-run gasoline with a sulfur content of 562 μg / g and a basic nitrogen compound of 19 μg / g is taken as the raw material oil, and the sulfur and nitrogen elements / AlCl 3 The mass ratio of 0.060, H 2 O / AlCl 3 The mass ratio is 0.09, and 0.291g AlCl 3 1. Add 0.026g of water into 30.0g of straight-run gasoline, seal the container, stir and heat up to 50°C, and react for 60min. After the reaction is finished, let it stand for 15 minutes, take the upper layer oil phase and add 0.5% volume of water to wash to obtain refined straight-run gasoline. The refined oil has a sulfur content of 13 μg / g and a desulfurization rate of 97.7%; a basic nitrogen content of 0 and a denitrification rate of 100.0%.

example 3

[0023] FCC gasoline with a sulfur content of 619 μg / g and a basic nitrogen content of 56 μg / g is taken as the raw material oil, and the sulfur and nitrogen elements / AlCl 3 The mass ratio is 0.020, H 2 O / AlCl 3 The mass ratio is 0.12, and 1.012gAlCl 3 1. Add 0.121g of water into 30.0g of FCC gasoline, seal the container, stir and heat up to 60°C, and react for 60min. After the reaction, let it stand for 10 minutes, take the upper oil phase and add 0.5% volume of water to wash to obtain refined FCC gasoline. The refined oil has a sulfur content of 72μg / g and a desulfurization rate of 88.4%; a basic nitrogen content of 0 and a denitrification rate of 100.0%.

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Abstract

The invention discloses a complex sulfurization and denitrification method for distillate in petrochemical industry and petroleum refining technology. Through the method, sulfides and nitrides are removed from gasoline, diesel oil and other light oil distillate and the oil quality is improved. The technical scheme comprises the following steps of: filling a complexing agent anhydrous AlCl3 and the distillate in a reactor according to a mass ratio of sulfur and nitrogen elements in the distillate to AlCl3 of 0.012-0.120; adding water serving as a complexing aid, wherein the mass ratio of the water to the AlCl3 is 0.08-0.12; carrying out complex reaction at the temperature of between 50 and 80 DEG C for 50 to 70 minutes; after the reaction is finished, making the distillate stand to split phase, wherein the standing time is 10 to 20 minutes; and finally, taking an upper oil phase out, and adding 0.5 to 2.0 volume percent of water to clean residual complex in the oil so as to prepare the refined distillate. The method has the advantages of mild reaction condition, low operating cost, simple technical flow, low equipment investment, good sulfurization and denitrification effects, and use for removing sulfides and nitrides from the distillate in the petroleum refining technology.

Description

technical field [0001] The invention relates to a method for complex desulfurization and denitrification of distillate oil used in petrochemical and petroleum refining processes. Background technique [0002] Distillate oil mainly refers to light oil products such as straight-run gasoline, catalytic gasoline, straight-run diesel and catalytic diesel. The sulfides in distillate oil mainly include mercaptan, sulfide, disulfide, thiophene, alkylthiophene, benzothiophene, dibenzothiophene and 4,6-dimethyldibenzothiophene, among which mercaptan, Sulfides, disulfides and thiophenes mainly exist in gasoline fractions, and sulfides, thiophenes and their derivatives mainly exist in diesel fractions. There are two main hazards of sulfide: first, it causes corrosion to equipment, poisons the hydrogenation catalyst, and affects the service life of the catalyst; second, SOx after sulfide combustion forms acid rain, causing air pollution. The nitrogen compounds in distillate oil mainly ...

Claims

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Application Information

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IPC IPC(8): C10G53/02C10G29/12
Inventor 唐晓东赖先熔卿大咏汪芳苏旭李晓贞吕玲
Owner SOUTHWEST PETROLEUM UNIV
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