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Diesel oxidation ammonia desulfurization method

An ammonia oxidation method and ammonia desulfurization technology, which are applied in chemical instruments and methods, separation methods, and purification with oxygenated compounds, etc., can solve the problems of high processing cost, high cost, long hydrodesulfurization process flow, etc. The effect of three wastes discharge, simple process and avoiding secondary pollution

Inactive Publication Date: 2015-09-23
JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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  • Abstract
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Problems solved by technology

[0008] The purpose of the present invention is to solve the shortcomings or deficiencies of the traditional diesel desulfurization technology: the hydrodesulfurization process is long, the cost is high, and the H obtained by hydrogenation 2 S requires further sulfur recovery and tail gas treatment, and the treatment cost is high; the existing oxidation process only involves oxidation and separation, and does not involve the recovery and utilization of sulfur

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  • Diesel oxidation ammonia desulfurization method

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Effect test

Embodiment 1

[0038]Under 0.1MPag, 70 ℃ of reaction conditions, in the suspended bed reactor that is filled with 100g acetic acid, sulfuric acid, molecular sieve mixed catalyst, raw material diesel oil (sulfur content 1450ppm) is passed into from the top of reactor with 1000ml / h rate, and air is passed into at 77.6 The L / h rate is introduced from the lower part of the side of the reactor. The reaction process is enhanced by ultrasonic waves. The reaction time is 45 minutes. The desulfurized diesel oil is discharged from the bottom, and the sulfur content is 8.4ppm after detection.

[0039] The oxidized tail gas containing 1% sulfur dioxide is discharged from the top of the reactor and sent to the ammonia absorption device. The desulfurization agent is 10% ammonia water, and the specific gravity of the absorption liquid is 1.15g / cm 3 , PH5.7, circulation volume 2.3L / h, sulfur dioxide content in net flue gas after absorption is 10ppm. The obtained ammonium sulfate solution is accumulated to a...

Embodiment 2

[0041] Under 0.23MPag, 82 ℃ of reaction conditions, in the suspended bed reactor that is filled with 200g oxalic acid, phosphoric acid, molecular sieve mixed catalyst, raw material diesel oil (sulfur content 1250ppm) is passed into from the reactor top with 2200ml / h speed, 30 %Oxygen concentration The oxygen-enriched air was introduced from the lower side of the reactor at a rate of 150L / h. The reaction process was enhanced by light, and the reaction time was 22min. The desulfurized diesel oil was discharged from the bottom, and the sulfur content was 8.8ppm after detection.

[0042] The oxidized tail gas containing 1% sulfur dioxide is discharged from the top of the reactor and sent to the ammonia absorption device. The desulfurization agent is liquid ammonia, and the specific gravity of the absorption liquid is adjusted to 1.17g / cm 3 , PH6.2, circulation volume 4.1L / h, sulfur dioxide content in net flue gas after absorption is 10ppm. The obtained ammonium sulfate solution is...

Embodiment 3

[0044] Except changing the catalyzer of embodiment into solid catalyst H 3 Ti 3 (PW 12 o 40 ) 5 , Molecular sieve mixed catalyst, other conditions are exactly the same, after 25 minutes of reaction time, the desulfurized diesel oil is discharged from the bottom, and the sulfur content is 7.6ppm after detection.

[0045] The oxidized tail gas containing 1% sulfur dioxide is discharged from the top of the reactor and sent to the ammonia absorption device. The desulfurization agent is ammonia water, and the specific gravity of the absorption liquid is adjusted to 1.169g / cm 3 , PH6.1, circulation volume 4.6L / h, sulfur dioxide content in net flue gas after absorption is 9.7ppm. The obtained ammonium sulfate solution is accumulated to a certain concentration, and after evaporation and crystallization, solid-liquid separation, and drying, the ammonium sulfate solid is obtained, which meets the requirements of the first-class product of the national standard, and the nitrogen cont...

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Abstract

The present invention discloses a diesel oxidation ammonia desulfurization method (DOA), comprising steps of:1) oxidation reaction. In the presence of a catalyst, using an oxidant and selectively oxidizing sulfur-containing compounds of diesel to obtain a finished diesel with the sulfur dioxide reaction exhaust and sulfur content amount is not more than 10ppm; 2) ammonia desulfurization. Using an ammonia desulfurization method to process the sulfur dioxide reaction exhaust, converting the sulfur dioxide into an ammonia sulfate fertilizer and emitting clean gas under required standards; and in the presence of the catalyst, using the oxidant and selectively oxidizing sulfur-containing compounds of diesel (mainly mercaptans, sulphides, and thiophenes sulfur-containing compounds). The method is simple in process with no secondary pollution and can be widely used in petroleum refining industry.

Description

technical field [0001] The invention relates to the production technology of petroleum products, in particular to a method (DOA) for removing sulfur in diesel oil (straight-run diesel oil, coked diesel oil, catalytic diesel oil) by oxidation of ammonia. Background technique [0002] With the increasingly stringent environmental protection regulations, the quality requirements for vehicle engine fuels are becoming more and more stringent worldwide, followed by the emergence of "clean fuels" with low sulfur, low aromatics and low olefin content, and the problem of sulfur content has become a domestic issue. The production of low-sulphur, especially ultra-low-sulphur vehicle engine fuel by major foreign oil refining companies has put forward stricter requirements for diesel locomotive fuel oil. At present, hydrodesulfurization technology is widely used in diesel desulfurization technology, but there are shortcomings in hydrodesulfurization, mainly in large investment, high oper...

Claims

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Application Information

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IPC IPC(8): C10G27/04C10G27/12C10G27/14B01D53/78B01D53/50C01C1/24C05C3/00
Inventor 祁丽昉张军罗勇迎王甫来徐建东
Owner JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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