Method and device for removing organic sulfur in methyl tertiary butyl ether (MTBE)

Abstract

The invention relates to a method and a device for removing organic sulfur in methyl tertiary butyl ether (MTBE). The method and the device are utilized for high-sulfur content MTBE refinement. The method and the device realize normal-pressure low-temperature extraction rectification desulphurization of a high-sulfur content MTBE product. A technical scheme of the invention comprises the following steps that 1, a sulfur-containing MTBE product is heated by a heat exchanger and then is fed into a rectifying tower from a lower part of the rectifying tower; 2, an extractant is fed into the heat exchanger, is heated and then is fed into the rectifying tower from an upper part of the rectifying tower, wherein a rectifying tower temperature is in a range of 70 to 80 DEG C and the heated sulfur-containing MTBE product and the heated extractant countercurrently contact with each other so that countercurrent contact extraction desulphurization is realized; 3, the desulfurated MTBE product is output from the top of the rectifying tower, is subjected to cooling condensation to form liquid in the heat exchanger and then is output; and 4, the sulfur-containing extractant obtained by the step 2is output from the bottom of the rectifying tower, is heated by the heat exchanger, is fed into a flash tank, is distilled at a temperature of 80 to 85 DEG C so that the residual desulfurated MTBE product is distilled off, then is fed into an actifier column, and countercurrently contacts with dry air in the actifier column so that countercurrent contact gas stripping regeneration is realized. Through the method and the device, good desulphurization effects are realized; a high product yield is obtained; and an extractant can be regenerated for recycle. The method is convenient for operation,has low costs and low energy consumption, and can be utilized for high-sulfur content MTBE product refinement.

Description

technical field [0001] The invention relates to a method and a device for removing organic sulfur from methyl tert-butyl ether used for refining high-sulfur-containing methyl tert-butyl ether products in oil refineries or chemical plants. Background technique [0002] Methyl tert-butyl ether, abbreviated as MTBE (methyl tert-butyl ether), as an important blending component of gasoline, can improve gasoline octane number and gasoline combustion efficiency, reduce CO and other harmful substances (such as ozone, benzene, Butadiene, etc.) and other advantages, have been popularized and applied in our country. MTBE is also an important chemical raw material. For example, high-purity isobutene can be prepared by cracking, and it is also used in the production of methacrolein and methacrylic acid. Isobutylene is an important chemical raw material, widely used in the synthesis of elastomers, pesticide intermediates and the production of polyisobutylene, tert-butylamine, tert-butylb...

AI Technical Summary

Problems solved by technology

Although this method can achieve the expected desulfurization effect, the operating temperature is high (90-120°C), and the production process consumes a lot of energy; as the production progresses, a large amount of organic sulfur at the bottom of the distillation column accumulates, resulting in organic sulfur with a low boiling point. Into the MTBE product; the organic sulfur discharged from the bottom of the rectification tower contains MTBE, resulting in a decrease in the yield of the desulfurized MTBE product

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