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Regeneration method of mtbe adsorption desulfurization solvent

An adsorption desulfurization and solvent technology, applied in ether separation/purification, ether preparation, organic chemistry, etc., can solve problems such as MTBE loss, air pollution, etc., and achieve the effect of eliminating loss, low operating cost, and simple process

Inactive Publication Date: 2017-07-04
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the solvent adsorbs sulfide, it also adsorbs a small amount of MTBE. When vacuum distillation is used to remove and recover sulfide, it will cause MTBE loss, and a small amount of MTBE will be discharged into the atmosphere with the vacuum system, causing air pollution.

Method used

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  • Regeneration method of mtbe adsorption desulfurization solvent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The rich absorption solvent containing 5% (mass fraction) of sulfur and 15% (mass fraction) of MTBE is sent to the vacuum absorption solvent regeneration tank with a diameter of 800mm and a height of 1000mm from the bottom of the absorption distillation tower at a speed of 300Kg / h , the temperature of the solvent vacuum regeneration tank is controlled at 85°C, the vacuum degree is 50KPa, and the vacuum extract is sent to a volume of 25m 3 Methanol recovery storage tank, after dissolving MTBE, the methanol aqueous solution is circulated back to the methanol recovery tower. Analyze the composition of the vacuum extract, the composition of the methanol aqueous solution, the composition of the sulfide in the upper layer of the methanol aqueous solution tank, and the composition of the solvent after regeneration, and count the yield of the MTBE unit. The analysis and statistical results are shown in Table 1.

Embodiment 2

[0017] The rich absorption solvent containing 3% (mass fraction) of sulfur and 10% (mass fraction) of MTBE is sent to the vacuum absorption solvent regeneration tank with a diameter of 800mm and a height of 1000mm from the bottom of the absorption distillation tower at a rate of 400Kg / h , the temperature of the solvent vacuum regeneration tank is controlled at 75°C, the vacuum degree is 30KPa, and the vacuum extract is sent to a volume of 25m 3 Methanol recovery storage tank, after dissolving MTBE, the methanol aqueous solution is circulated back to the methanol recovery tower. Analyze the composition of the vacuum extract, the composition of the methanol aqueous solution, the composition of the sulfide in the upper layer of the methanol aqueous solution tank, and the composition of the solvent after regeneration, and count the yield of the MTBE unit. The analysis and statistical results are shown in Table 1.

Embodiment 3

[0019] The rich absorption solvent containing 15% (mass fraction) of sulfur and 15% (mass fraction) of MTBE is sent to the vacuum absorption solvent regeneration tank with a diameter of 800mm and a height of 1000mm from the bottom of the absorption distillation tower at a rate of 500Kg / h , the temperature of the solvent vacuum regeneration tank is controlled at 80°C, the vacuum degree is 40KPa, and the vacuum extract is sent to a volume of 25m 3 Methanol recovery storage tank, after dissolving MTBE, the methanol aqueous solution is circulated back to the methanol recovery tower. Analyze the composition of the vacuum extract, the composition of the methanol aqueous solution, the composition of the sulfide in the upper layer of the methanol aqueous solution tank, and the composition of the solvent after regeneration, and count the yield of the MTBE unit. The analysis and statistical results are shown in Table 1.

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Abstract

The invention provides a method for regenerating an MTBE (methyl tert-butyl ether) adsorbent desulfurization solvent and recycling MTBE. The method specifically comprises the following steps of: during vacuum regeneration of the MTBE adsorbent desulfurization solvent, dissolving a mixture including the MTBE and sulfide which are subjected to vacuum extraction in methanol recycle-water of an MTBE device, dissolving the MTBE in the methanol recycle-water, recycling the MTBE through a methanol recycling system of the MTBE device, and recycling the sulfide by using a methanol water absorption tank because the sulfide is insoluble in water to realize the recycling of the MTBE and the regeneration of an adsorbent solvent.

Description

technical field [0001] The invention belongs to the field of petrochemical technology. The invention relates to the technology of removing sulfide in MTBE, and specifically provides a regeneration method for removing sulfide solvent in MTBE by adsorption distillation. Background technique [0002] MTBE (methyl tert-butyl ether) is the addition reaction product of isobutene and methanol in liquefied petroleum gas (C4 fraction). MTBE is not only a high-octane clean gasoline blending component, but also a raw material for cracking to produce high-purity isobutene. It is an important petrochemical raw material and product. [0003] With the development of heavy and inferior crude oil and the deepening requirements for comprehensive utilization of resources, the sulfur content in catalytic cracking and coking carbon four fractions is gradually increasing. While the C4 fraction reacts with methanol to produce MTBE, sulfur-containing compounds such as mercaptans in the C4 fractio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/04C07C41/34
Inventor 姚志龙孙培永段月欣叶丽莉
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY