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Method for removing sulfur-containing compound from catalytically cracked gasoline by using polyglycol extraction process

A technology for catalytic cracking of gasoline and polyethylene glycol, applied in the petroleum industry, refined hydrocarbon oil, etc., can solve the problems of no treatment, and achieve the effects of low operating cost, simple operation, and simple and convenient solvent recovery

Inactive Publication Date: 2002-03-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although extraction and desulfurization technology is relatively mature, it is still only used to remove mercaptan sulfides in gasoline so far. The widely used non-caustic Merox process, GT-DeSulf process, and alkali washing process are all only for FCC. The mercaptan sulfides in the light fraction of gasoline are desulfurized and deodorized (see Chen Huimin, Refining Design, Volume 31, No. 8, 2001: 1-7), and the non-mercaptan sulfides in the middle and heavy fractions are not treated

Method used

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  • Method for removing sulfur-containing compound from catalytically cracked gasoline by using polyglycol extraction process
  • Method for removing sulfur-containing compound from catalytically cracked gasoline by using polyglycol extraction process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. Use n-octane + thiophene (simulated gasoline ①, sulfur content: 995ppm), n-octane + benzothiophene (simulated gasoline ②, sulfur content: 1006ppm) to constitute the simulation system of FCC gasoline middle and heavy fractions;

[0014] 2. Weigh a certain mass of simulated gasoline and polyethylene glycol 400, so that the mass ratio of the agent to oil is 1, 1.5, 2, 2.5 and 3, respectively, add them to the container, and put them into the container at a temperature of 30°C, 40°C, 50°C and Shake at a constant temperature in a water bath at 60°C for 30 minutes to fully mix the two phases, and then separate the two phases after standing at a constant temperature for 15 minutes;

[0015] 3. Take the upper gasoline phase for sulfur content analysis, and calculate the apparent partition coefficient and sulfur removal rate, and the results are shown in Table 1 and Table 2, respectively.

[0016] 30℃

[0017] 30℃

Embodiment 2

[0019] 1. Add thiophene and benzothiophene (simulated gasoline ③) to n-octane in a certain proportion, so that the sulfur in thiophene and the sulfur in benzothiophene each account for about 50% of the total sulfur, and the total sulfur content is 1143ppm ;

[0020] 2. Carry out three-stage cross-current extraction for simulated gasoline ③ at a solvent-oil mass ratio of 1:1, and a three-stage counter-current extraction at a solvent-oil mass ratio of 1.5:1. The extraction temperatures are 30°C, 40°C, and 50°C, respectively. ℃ and 60℃;

[0021] 3. Measure the sulfur content of the gasoline phase after the three-stage extraction, and calculate the sulfur removal rate. The results are shown in Table 3.

[0022] Way

Embodiment 3

[0024] 1. The unsweetened FCC gasoline of Shengli Refinery of Qilu Petrochemical Company was fractionated at 120°C, leaving the middle and heavy fractions with a boiling point higher than 120°C, and the measured sulfur content was 938ppm;

[0025] 2. Weigh a certain mass of actual gasoline and polyethylene glycol 400, so that the mass ratio of the agent to oil is 1, 1.5, 2, 2.5 and 3, respectively, add them to the container, and add them to the container at temperatures of 30°C, 40°C, 50°C and Shake at a constant temperature in a water bath at 60°C for 30 minutes to fully mix the two phases, and then separate the two phases after standing at a constant temperature for 15 minutes;

[0026] 3. Take the upper gasoline phase for sulfur content analysis, and calculate the apparent partition coefficient and sulfur removal rate, the results are shown in Table 4 respectively;

[0027] 4. According to the apparent partition coefficient obtained above, calculate the sulfur content and t...

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Abstract

The present invention uses polyglycol 400 as desulfurizing solvent to make multi-stage countercurrent extraction of gasoline. The mass ratio of extracting agent and gasoline is 1-3.5:1. Extracting temp. is 20-70 deg.C. Extracting time is 10-50 min. and constant temperature standing time is 10-30 min. Then. the gasoline phase taken out is the desulfurized gasoline. Said invented solvent possesses the advantages of high desulfurizing efficiency, less toxicity, low mutual solubility with gasoline, simple and convenient for recovering solvent. As compared with hydrogenation process said invented extraction process features small equipoment investment, low cost and simple operation. The loss in octane number of the treated gasoline is small.

Description

Technical field: [0001] The invention relates to a method for extracting and removing sulfur-containing compounds in catalytic cracking gasoline with polyethylene glycol, belonging to the technical field of petrochemical industry. Background technique: [0002] Sulfur-containing compounds are non-ideal components in gasoline. Their presence will not only make gasoline have a foul smell, corrode equipment and accelerate the swelling of some plastic containers, but also accelerate the oxidation of unstable components in gasoline to form gels. quality, thereby deteriorating the quality of gasoline. More importantly, SO x The harm to the environment caused by the harmful substances emitted by burning gasoline cannot be ignored more and more. Removal of sulfur compounds in gasoline is not only beneficial to reduce SO in the air x content, but also for reducing other pollutants such as NO x Emissions also play a significant role. For this reason, various countries and regions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G21/12C10G21/16
Inventor 李志东朱慎林王军民朴香兰
Owner TSINGHUA UNIV
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