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Device and method for deeply removing organic sulphides in methyl tertiary butyl ether (MTBE)

A technology of methyl tertiary butyl ether and sulfide, applied in organic chemistry, ether separation/purification, ether preparation, etc., can solve the problems of low operating cost, low energy consumption for desulfurization, low MTBE yield, etc., and achieve MTBE recovery Increased efficiency and reduced process energy consumption

Active Publication Date: 2015-08-12
CHINA CONSTR IND & ENERGY ENG GRP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a device and method for deep removal of organic sulfur by MTBE, aiming to solve the problems of high energy consumption and low MTBE yield due to the accumulation of organic sulfur by MTBE in the rectification and desulfurization production of MTBE. By adopting the process method coupled with multi-effect distillation and extractive distillation, the desulfurization energy consumption is low, the separation efficiency is high, the extraction agent recovery has no secondary pollution, the operation cost is low, and high recovery rate and high purity MTBE are obtained.

Method used

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  • Device and method for deeply removing organic sulphides in methyl tertiary butyl ether (MTBE)

Examples

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Effect test

Embodiment 1

[0036] In this example, MTBE produced by a catalytic reaction distillation unit in a refinery is characterized by MTBE 99.05%, methanol 0.0123%, tert-butanol 0.0324%, methyl sec-butyl ether 0.51%, water 0.00438%, trimethyl -2-pentene 0.285%, diisobutene 0.0285%, 2-methyl-1-butene 0.0372%, isopentane 0.0399%, dimethyl disulfide 0.0247%, ethyl methyl disulfide 0.0149%, Methyl tert-butyl sulfide 0.0051%, diethyl disulfide 0.00175%, dimethyl sulfide 0.00325%. Simultaneously, in the present embodiment, T1 tower, T2 tower and T3 tower all adopt identical theoretical plate number, and extraction agent is C 12 Branched alkanes, all tower packings are wire mesh corrugated structured packing.

[0037] The separation requirements are realized through the following specific devices: the middle part of the high-pressure multi-effect rectification tower T1 is equipped with an MTBE raw material inlet, the raw material preheater E1-1 hot stream inlet port is connected to the T1 tower bottom ...

Embodiment 2

[0040] A method for deep removal of organic sulfides in MTBE, the overall process is the same as in Example 1, but the difference is that the extractant is selected from N-methylpyrrolidone, the total sulfur content is 4188ppm, and the sulfur-containing species is dimethyl Disulfide 0.1878%, ethyl methyl disulfide 0.1249%, methyl tert-butyl sulfide 0.0851%, diethyl disulfide 0.01125%, dimethyl sulfide 0.00975%. MTBE with a purity of 98.95% is used as raw material to enter the combined process. During the rectification and desulfurization process, the operating pressures of the T1 tower and T2 tower are controlled at 2.2 bar and 1.2 bar respectively, and the T3 tower is operated at normal pressure, and the total reflux is carried out to the rectification tower. The operating pressure and temperature After stabilization, adjust the reflux ratios of T1, T2 and T3 to 3, 3 and 6 respectively. After the rectification tower is stabilized, the temperature at the bottom of T1 is control...

Embodiment 3

[0042] A method for deep removal of organic sulfides in MTBE, the overall process is the same as in Example 1, but the difference is that the extractant is a mixture of N-methylpyrrolidone and tributyl phosphate, N-methylpyrrolidone and phosphoric acid The tributyl ester is 1.5, the mass mixing ratio of N-methylpyrrolidone and tributyl phosphate is 2, the total sulfur content is 68ppm, the sulfur-containing species are dimethyl disulfide 0.0159%, ethyl methyl disulfide 0.0071% %, methyl tert-butyl sulfide 0.0028%, MTBE with a purity of 99.10% is used as raw material to enter the combined process, during the rectification and desulfurization process, the operating pressures of the T1 tower and the T2 tower are controlled at 2 bar and 1 bar respectively, and the T3 tower is operated at normal pressure. After the total reflux to the operation pressure and temperature of the rectification tower is stable, adjust the reflux ratio of T1 tower, T2 tower and T3 tower to 2, 2 and 4 resp...

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Abstract

The invention provides a device and a method for deeply removing organic sulphides in methyl tertiary butyl ether (MTBE). The device comprises a high-pressure multi-effect rectifying tower, a medium-pressure multi-effect rectifying tower, a normal-pressure multi-effect rectifying tower, an extraction rectifying tower and an extraction agent recycling tower connected in series; a condenser is arranged on the top of each tower; a reboiler is arranged at the bottom of each tower; a material outlet at the bottom of each tower is connected to a material inlet in the middle of a next tower through a pipeline; 90%-95% of qualified MTBE products can be distilled out through the tops of the multi-effect rectifying towers; the organic sulphides are enriched at the bottom of the extraction rectifying tower under the action of an extraction agent; remained MTBE distilled by the tops of the towers returns into a raw material tank; and the cycle repeats. By means of reasonable heat exchange network design, vapor from the tops of the towers and heat of the extraction agent are sufficiently utilized, so that energy consumption in a desulfurizing process is reduced; the total sulphur content of MTBE produced through a multi-effect rectifying and extraction rectifying coupling method is less than 10 ppm; deep sulphur removing requirements are satisfied; the total recovery rate of MTBE is up to 99.8%; and furthermore, the theoretical energy-saving efficiency is up to 53%.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and specifically provides a device and method for deeply removing organic sulfides in methyl tert-butyl ether. Background technique [0002] Methyl tert-butyl ether (MTBE for short) is the addition reaction product of isobutylene and methanol in the C4 fraction of liquefied petroleum gas. It is also a raw material for pyrolysis to produce high-purity isobutene, and is an important petrochemical raw material and product. Automobile fuel is the main source of air pollution in cities. Therefore, the country has stricter and stricter quality requirements for automobile gasoline. The National V standard stipulates that the sulfur content in automobile gasoline should be less than 10ppm. Therefore, the sulfur content of MTBE must also be below 10ppm. MTBE The sulfur in the MTBE products produced by the device is mostly organic sulfides, mostly sulfides, mercaptans and thiophenes. Due t...

Claims

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Application Information

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IPC IPC(8): C07C43/04C07C41/34C07C41/42C07C41/38
CPCC07C41/34C07C41/38C07C41/42C07C43/04Y02P20/10
Inventor 秦凤祥李凭力黄益平徐义明李英栋岳昌海陆晓咏赵雅静
Owner CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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