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Extraction anti-gum agent for MTBE desulfurization

An extraction and anti-glue technology, applied in extractive distillation, ether separation/purification, ether preparation, etc., can solve the problems of large vapor-phase reflux, coking at the bottom of desulfurization tower, etc., and achieve the effect of promoting complexation

Active Publication Date: 2016-07-20
HEBEI REFINING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, the MTBE extractive distillation desulfurization process with the addition of conventional extractants, although the yield at the top of the tower is very high, but the by-products at the bottom of the tower are highly enriched in sulfides and olefins, and the amount of by-products is very small while the reflux of the vapor phase is very large. Cause the by-products to stay in the high temperature environment at the bottom of the tower for a long time, often causing coking at the bottom of the desulfurization tower

Method used

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  • Extraction anti-gum agent for MTBE desulfurization

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Embodiment 1

[0034] An extraction anti-adhesive agent for MTBE desulfurization, in parts by weight, it consists of the following components:

[0035] 100 parts of toluene

[0036] 1 part of 2,6-di-tert-butyl-p-cresol

[0037] The above-mentioned components are conventionally mixed according to the stated ratio to obtain the extraction anti-adhesive agent I of the present invention.

[0038]In the extraction anti-adhesive agent I, the boiling point of toluene is 110°C, which is similar to that of dimethyl disulfide, and has strong solubility for sulfides. As a sulfur storage agent at the bottom of the tower, it can dilute the concentration of sulfides at the bottom of the tower; 2 , 6-di-tert-butyl-p-cresol effectively reduces the occurrence of free radical chain reaction as a free radical blocker, so that the extraction anti-adhesive agent I of the present embodiment can effectively remove MTBE by extraction in actual production The sulfur compounds in the extractive distillation column ...

Embodiment 2

[0040] An extraction anti-adhesive agent for MTBE desulfurization, in parts by weight, it consists of the following components:

[0041] 50 parts of toluene

[0042] 50 parts of tert-butanol

[0043] 5 parts of 2,6-di-tert-butyl-p-cresol

[0044] The above-mentioned components are conventionally mixed according to the stated ratio to obtain the extraction anti-adhesive agent II of the present invention.

[0045] In the extraction anti-adhesive agent II, the boiling point of toluene is 110°C, which is similar to that of dimethyl disulfide, and it has strong solubility for sulfide. It is used as a sulfur storage agent at the bottom of the tower to dilute the concentration of sulfide at the bottom of the tower; tert-butyl Alcohol has a boiling point of 80°C. As the main component of the vaporized phase at the bottom of the tower, it can be well enriched in the middle and lower parts of the tower, and the minimum amount of addition can meet the production needs of a large amount...

Embodiment 3

[0047] An extraction anti-adhesive agent for MTBE desulfurization, in parts by weight, it consists of the following components:

[0048] 80 parts of toluene

[0049] 20 parts of isopropanol

[0050] 2 parts of 2-methyl-4-mercapto-6-tert-butylphenol

[0051] The above-mentioned components are conventionally mixed according to the stated ratio to obtain the extraction anti-adhesive agent III of the present invention.

[0052] In the extraction anti-adhesive agent III, the boiling point of toluene is 110°C, which is similar to that of dimethyl disulfide, and it has a strong solubility for sulfides. It is used as a sulfur storage agent at the bottom of the tower to dilute the concentration of sulfides at the bottom of the tower; Alcohol has a boiling point of 82°C, and is composed of toluene and isopropanol with a boiling point of 80-110°C as the main vaporized solvent at the bottom of the tower. Since the boiling point of the solvent is between the boiling point of MTBE and the...

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Abstract

The invention relates to an extraction anti-gum agent for MTBE desulfurization.The extraction anti-gum agent at least contains a solvent with the boiling point ranging from 80 DEG C to 150 DEG C, and the solvent at least contains one or a mixture of two or more of C7 (and above) aromatic hydrocarbons with the boiling point ranging from 110 DEG C to 150 DEG C.The extraction anti-gum agent can efficiently remove sulfide in MTBE and also can effectively prevent coking at the bottom of an extractive distillation tower; on the premise of guaranteeing a high vaporization rate of the distillation tower, vaporization of sulfide can be effectively reduced, the distribution gradient of sulfide in the tower can be effectively reduced, and the number of tower plates needed for distillation or the reflux ratio can be effectively decreased, so that investment or operation cost is significantly lowered; the extraction anti-gum agent has a strong extraction effect on low-boiling-point sulfide; recovery or additional treatment is not needed, and no waste is generated.

Description

technical field [0001] The invention relates to a desulfurization aid, in particular to a desulfurization aid used in MTBE production. Background technique [0002] Methyl tert-butyl ether (MTBE) is a high-octane gasoline additive. It is an ideal blending component for the production of unleaded gasoline and high-octane oxygenated gasoline. As a gasoline additive, it has been widely used all over the world. . It can not only effectively increase the octane number of gasoline, but also improve the performance of automobiles, reduce the content of carbon monoxide in exhaust gas, and reduce the cost of gasoline production. In addition, MTBE is also an important chemical raw material, which can produce high-purity isobutene through cracking. [0003] MTBE is formed by the addition reaction of methanol and isobutene under the action of an acidic catalyst. Industrially, the isobutene for preparing MTBE is mainly provided by the mixed carbon four components of oil refining, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/42C07C41/46B01D3/40
CPCB01D3/40C07C41/42C07C41/46C07C43/046
Inventor 郝天臻程兴国高永强
Owner HEBEI REFINING TECH CO LTD
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