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 super low sulfur 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, sulfide, mixture C4 and methyl tert-butyl ether; the method also includes introduction of a sulfur enrichment agent into the methyl tert-butyl ether-containing solution during and / or before the distillation separation process, distillation conditions are controlled for collecting the methanol and the mixture C4 from the top of the tower, the sulfide absorbed by the sulfur enrichment agent of the sulfide which is not absorbed by the sulfur enrichment agent 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) can be produced only by one-time distillation the production of ultra low sulfur, energy consumption, equipment investment and maintenance cost are reduced, and the method 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 defect of this method is that MTBE needs to be re-distilled. Although the heat of vaporization of MTBE is relatively small, the method of re-distillation can certainly improve the purity of MTBE, and can also significantly reduce the MTBE sulfur content, but to obtain a higher Yield still requires a large number of trays, and a large reflux ratio at the top of the tower is required during the distillation process. Undoubtedly, the energy consumption will be high, and the investment and maintenance costs of the equipment are also high. From an economic point of view obviously unreasonable

Images