Method for producing low-sulfur methyl tert-butyl ether product

Abstract

The invention relates to the field of petrochemical industry, and discloses a method for producing a low-sulfur methyl tert-butyl ether (MTBE) product. The method is characterized in the following steps that: isobutene-containing mixed C4 is delivered to a middle tray of a pentane removing tower; isobutene-containing mixed C4 is rectified and separated at a temperature of 35 to 45 DEG C, and under a pressure of 0.55 to 0.75Mpa; C4 discharged from the tower top is cooled through a cooler, and is delivered to a reflux accumulator; one part of the C4 is pumped by a reflux pump and is used for liquid phase refluxing, and the other part of the C4 is delivered to a mixed-C4 raw material tank and is used for feeding an MTBE reaction system; through processes of MTBE synthesis, azeotropic distillation, and methanol recovery, the low-sulfur MTBE product is obtained. The low-sulfur MTBE product provided by the present invention assists in solving the problem of high total sulfur content in oil refining MTBE. With the method provided by the present invention, the sulfur content of MTBE product can be reduced to 150ppm or lower.

Description

[0001] (1) Technical field [0002] The invention relates to the field of petrochemical industry, in particular to a method for producing a low-sulfur methyl tert-butyl ether product. (2) Background technology [0003] Methyl tert-butyl ether, abbreviated as MTBE (methyl tert-butyl ether), has a melting point of -109°C and a boiling point of 55.2°C. It is a colorless, transparent, high-octane liquid with an ether-like odor. It is an ideal blending component for the production of unleaded, high-octane, and oxygenated gasoline, and has been widely used as a gasoline additive all over the world. It can not only effectively increase the octane number of gasoline, but also improve the performance of automobiles, reduce the CO content in exhaust gas, and reduce the production cost of gasoline at the same time. In addition, MTBE is also an important chemical raw material, such as high-purity isobutene can be prepared by cracking. [0004] In recent years, with the increasingly se...

AI Technical Summary

Problems solved by technology

In view of the fact that MTBE is easy to dissolve sulfide, its molecular structure is unstable, and it is soluble in water, etc., the sulfide in MTBE products is difficult to desulfurize, making it difficult for MTBE products to meet the quality requirements of National III standard gasoline blending components

Therefore, the process of deep removal of sulfur content in raw material liquefied gas of gas separation unit has attracted wide attention, but most of them are difficult to achieve a stable sulfur content in mixed C4 raw materials below 40ppm, which makes it difficult for some refineries processing high-sulfur crude oil to produce sulfur content MTBE products below 150ppm

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