Preparation method and device of methyl tertiary-butyl ether (MTBE)

A technology of methyl tert-butyl ether and tert-butanol, which is applied in the direction of ether preparation, dehydration of hydroxyl-containing compounds to prepare ether, ether separation/purification, etc. It can solve the problem of affecting the reaction balance and not considering the azeotropic problem of tert-butanol, etc. problems, to achieve the effect of increasing conversion rate, reducing equipment investment, and reducing material consumption and energy consumption

Active Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent uses water as the extractant, and does not take into account the azeotropic problem of tert-butanol and water, which affects the balance of the reaction

Method used

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  • Preparation method and device of methyl tertiary-butyl ether (MTBE)
  • Preparation method and device of methyl tertiary-butyl ether (MTBE)
  • Preparation method and device of methyl tertiary-butyl ether (MTBE)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0046] The components of the outlet product obtained under the different temperatures of the fixed-bed reactor are shown in Table 1, and the pressure is 1.5MPa:

[0047] Fixed-bed reactor reaction result table under different temperatures of table 1

[0048]

Embodiment 4-6

[0050] The gas phase form of the reaction product of the fixed reactor of Example 3 is fed from the middle of the extraction tower, and the extractant ethylene glycol is injected into the tower from the upper part of the extraction tower in liquid phase. The extraction results are shown in Table 2.

[0051] Table 2 Extraction Tower Data Sheet

[0052]

[0053]

Embodiment 5

[0055] The extraction tower bottom material of embodiment 5 enters the first extractant recovery tower, and the extraction tower bottom material is composed of methanol, tert-butanol, ethylene glycol, MTBE, and water.

[0056] The pressure at the top of the first extraction agent recovery tower is normal pressure, the temperature at the top of the tower is 45°C, and the temperature at the bottom of the tower is 100°C. The rest of the operating conditions and analysis data Table 3 are as follows:

[0057] Table 3 The operating conditions and analysis results of the first extractant recovery tower

[0058] Example Reflux ratio Tank pressure / MPa Tower kettle tert-butanol content% Ethylene glycol content at the top of the tower, % 7 1 0.1 0.003 0.008 8 2 0.1 - - 9 3 0.1 - -

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Abstract

The invention relates to an ether production technology and especially relates to a method and production device for preparing methyl tertiary-butyl ether (MTBE) by a reaction of tertiary butanol and methanol. The method comprises that tertiary butanol and methanol are mixed and undergo a reaction to produce mixed gas, the mixed gas is fed into an extraction tower and is extracted, isobutene and MTBE are distilled off from the tower top, tertiary butanol, methanol, a trace amount of MTBE, water and an extractant flow out of the tower bottom, methanol is supplied for a tower top component of the extraction tower, the mixture is fed into a catalytic distillation tower, a methanol- and isobutene-containing tower top product of the catalytic distillation tower is fed back to a reactor and then undergoes a reaction, the MTBE is discharged from the bottom of the catalytic distillation tower, the materials discharged from the bottom of the catalytic distillation tower enters into a first extractant recovery tower, tertiary butanol, methanol and a trace amount of MTBE are distilled off from the top of the first extractant recovery tower, then are fed back to the reactor and then undergo a reaction, and the extractant and water flow out of the tower bottom, then enter into a second extractant recovery tower and then is recovered for recycle by reduced pressure distillation. The method and device solve the problem of azeotropy of tertiary butanol and water and improve a tertiary butanol one-step conversion rate to 87-94%.

Description

technical field [0001] The invention relates to a production process of ethers, in particular to a method and a device for preparing methyl tert-butyl ether by reacting tert-butanol and methanol. Background technique [0002] The main uses of methyl tert-butyl ether (MTBE) are: (1) It is an excellent high-octane gasoline additive and antiknock agent. (2) It can also be used as a chemical reagent and a reaction solvent. For example, in the process of tert-butylation reaction, as a tert-butylation reagent, diethyl ether or tetrahydrofuran can also be used as a reaction solvent. (3) It can also be used to decompose and produce high-purity isobutene. [0003] my country's existing refinery equipment structure cannot meet the production of high-grade gasoline, that is, catalytic cracking gasoline accounts for about 80% of all types of gasoline, and the main production device of high-grade gasoline——catalytic reforming device accounts for a significantly lower proportion. This r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/04C07C41/09C07C41/44
CPCC07C41/09C07C41/38C07C41/42C07C41/44C07C43/046Y02P20/10
Inventor 杨忠梅孙强朱相春侯磊付静何宗华刘淑芝李刚李玉田吕爱梅
Owner CHINA PETROLEUM & CHEM CORP
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