Methyl tert-butyl ether crude product purification method and methyl tert-butyl ether production method

Abstract

The invention provides a methyl tert-butyl ether crude product purification method and a methyl tert-butyl ether production method, the method comprises distillation separation of a methyl tert-butyl ether-containing solution in a distillation ctower, the methyl tert-butyl ether-containing solution contains methanol, sulfides, mixture C4 and methyl tert-butyl ether; before the distillation separation, the sulfides capable of being oxidized, in the methyl tert-butyl ether-containing solution, are oxidized; distillation conditions are controlled for collecting of the methanol and the mixture C4 from the top of the tower, the oxidized sulfides and / or the sulfides which are not oxidized are collected from the bottom of the tower, and a methyl tert-butyl ether-containing material flow is collected from a side line. According to the method, super low sulfur methyl tert-butyl ether (MTBE) and low sulfur unreacted C4 can be produced only by use of a catalytic distillation or an azeotropic distillation device in the prior art, the method has the advantages of simple desulfurization process, low operation energy consumption, low investment of equipment and maintenance costs, and is very suitable for industrial application.

Description

technical field [0001] The invention relates to a method for purifying crude methyl tert-butyl ether and a method for producing methyl tert-butyl ether. Background technique [0002] As we all know, methyl tert-butyl ether (MTBE) is the largest non-hydrocarbon blending component in gasoline in my country, which can significantly improve the quality of gasoline. However, MTBE obviously contains sulfide, which generally reaches 50-200mg / kg, and the sulfur content of MTBE produced by some manufacturers is sometimes as high as 2000mg / kg. [0003] In the era when my country implemented gasoline National II, the sulfur content requirement was not greater than 500mg / kg. Since the sulfur content of MTBE was lower than 500mg / kg in most cases, blending it into gasoline had no negative impact on gasoline sulfur content; in the implementation of gasoline National III Nowadays, as long as the management and monitoring of the desulfurization process of liquefied petroleum gas are strength...

AI Technical Summary

Problems solved by technology

The disadvantage of this technique is that the energy consumption of raw material distillation and separation is high, and the second is that the boiling point of sulfide in heavy C4 is not much different from that of light C4 such as isobutylene, so it is difficult to separate completely, and the sulfur content of MTBE obtained as a result is also low. Difficult to reach below 10mg / kg

The sulfur content of C4 obtained after the current liquefied gas desulfurization, gas separation and MTBE process is usually 5-100mg / kg. It is difficult to meet the requirement of 10mg / kg, let alone meet the industrial requirement that the sulfur content is not greater than 1mg / kg

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