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Method for removing sulfide in methyl tertiary butyl ether through double-solvent extractive distillation

A methyl tert-butyl ether, extractive distillation technology, applied in ether separation/purification, ether preparation, organic chemistry and other directions, can solve the problems of high cost, low safety factor and strong corrosiveness of sulfur-containing wastewater, and achieve low sulfur content, no three waste emissions, and the effect of reducing investment costs

Inactive Publication Date: 2014-07-16
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high energy consumption, complex process, low safety factor, strong corrosion, and produces a large amount of sulfur-containing wastewater with high cost.

Method used

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  • Method for removing sulfide in methyl tertiary butyl ether through double-solvent extractive distillation

Examples

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Effect test

example 1

[0018] The sulfur content of MTBE feedstock oil is 129μg / g, and it is used as lubricating oil for organic sulfur extraction agent. First, mix the organic sulfur extractant and MTBE raw material oil at a mass ratio of 0.1, and then enter the column from the lower part of the extraction tower 1 into the tower for countercurrent contact with the MTBE extractant for extraction. The operating conditions of the extraction tower 1 are: pressure 0.21MPa, temperature 20°C , Airspeed 1.0h -1 The composition of MTBE extraction agent is: water 59g, NMP12g, DMF15g, triethylene glycol 5g, sulfolane 4g, n-butanol 5g; MTBE extraction agent and MTBE raw material oil enter extraction tower 1 top with agent oil mass ratio 3.0 countercurrent; MTBE product The operating conditions of distillation column A2 are: pressure 0.10MPa, tower bottom temperature 75°C, tower top temperature 70°C, space velocity 1.1h -1 ; The operating conditions of organic sulfur extraction agent recovery distillation towe...

example 2

[0020] The sulfur content of MTBE feedstock oil is 120μg / g, and the organic sulfur extraction agent uses diesel oil. First mix the organic sulfur extractant and MTBE raw material oil according to the mass ratio of 0.1, and then enter the column from the lower part of the extraction tower 1 to contact and extract the MTBE extractant countercurrently. The operating conditions of the extraction tower 1 are: pressure 0.20MPa, temperature 20°C , Airspeed 1.3h -1 The composition of MTBE extraction agent is: water 63g, NMP11g, DMF15g, triethylene glycol 4g, sulfolane 4g, n-butanol 3g; MTBE extraction agent and MTBE raw material oil enter extraction tower 1 top with agent oil mass ratio 2.0 countercurrent; MTBE product The operating conditions of distillation column A2 are: pressure 0.10MPa, tower bottom temperature 75°C, tower top temperature 70°C, space velocity 1.2h -1 ; The operating conditions of organic sulfur extraction agent recovery distillation tower B9 are: pressure 0.11MP...

example 3

[0022] The sulfur content of MTBE feedstock oil is 137μg / g, and kerosene is used as organic sulfur extraction agent. First, mix the organic sulfur extractant and MTBE raw material oil according to the mass ratio of 0.2, and then enter the tower from the lower part of the extraction tower 1 to contact and extract the MTBE extractant countercurrently. The operating conditions of the extraction tower 1 are: pressure 0.30MPa, temperature 20°C , Airspeed 1.0h -1 The composition of MTBE extraction agent is: water 70g, NMP10g, DMF10g, triethylene glycol 5g, sulfolane 2g, n-butanol 3g; MTBE extraction agent and MTBE raw material oil enter extraction tower 1 top with agent oil mass ratio 3.5 countercurrents; MTBE product The operating conditions of distillation column A2 are: pressure 0.15MPa, tower bottom temperature 75°C, tower top temperature 70°C, space velocity 1.1h -1 ; The operating conditions of organic sulfur extraction agent recovery distillation tower B9 are: pressure 0.15M...

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Abstract

The invention relates to a method for removing sulfide in methyl tertiary butyl ether through double-solvent extractive distillation in a refinery plant or chemical industry, which can deeply remove sulfide in methyl tertiary butyl ether. The method comprises the following steps of mixing an organic sulfur extraction agent with a sulfur-containing MTBE raw oil and inputting the mixture from the lower part of an extraction tower, simultaneously, inputting an MTBE extraction agent from the upper part of the extraction tower, contacting the two fluids in countercurrent manner to be extracted in the extraction tower; extracting MTBE into the MTBE extraction agent and outputting from the bottom of the extraction tower, inputting into a distillation tower A from the lower part for distilling the MTBE product, evaporating and recycling the refined MTBE from the top of the tower, outputting the MTBE extraction agent from the bottom of the tower, and recycling; extracting the sulfide into the organic sulfur extraction agent and outputting from the top of the extraction tower, inputting into a distillation tower B from the middle part for distillation, discharging the sulfide from the top of the tower and entering sulfide to a recycling device, discharging the organic sulfur extraction agent from the bottom of the tower and desulfurizing circularly. The method has good desulfurizing effect, is simple and convenient to operate, and has low energy consumption, and the product has stable quality and high yield.

Description

technical field [0001] The invention relates to a method for removing sulfides in methyl tert-butyl ether by dual-solvent extraction and distillation used in refinery or chemical industry. Background technique [0002] Methyl tert-butyl ether, abbreviated as MTBE, has become the main blending component for increasing octane number and adding oxygen-containing compounds due to its high octane number and good blending performance, and has been widely used in various regions. The main application of MTBE in the downstream of chemical industry is to produce high-purity isobutene, and then use isobutene as raw material to produce chemical products. The chemical industry has high requirements for MTBE indicators and very low sulfur content requirements, and it is difficult for the MTBE produced by most domestic manufacturers to meet the requirements. The raw material of MTBE mainly comes from C in catalytic cracking, coking and ethylene plant liquefied petroleum gas. 4 component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/42
CPCC07C41/42C07C43/046
Inventor 唐晓东李晶晶谯勤卿大咏程瑾袁娇阳赵千舒陈露张永汾
Owner SOUTHWEST PETROLEUM UNIV
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