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Desorption method of methyl-ethyl ketone rich solvent

A technology of methyl ethyl ketone and rich solvent, which is applied in the field of desorption and absorption of methyl ethyl ketone rich solvent, which can solve the problems of inability to use desorption, affecting the treatment and utilization of n-butene hydration reaction tail gas, the difficulty of separation and desorption, etc.

Active Publication Date: 2007-02-07
SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the rich solvent formed by absorbing the impurities in the n-butene hydration reaction tail gas with a solvent, the solute boiling point distribution range is wide (greater than 120 ° C), some are lower than the solvent, some are close to the solvent, and some are higher than the solvent. Simultaneously, there is multivariate azeotrope between solute, between solvent and solute (for example except carbon four, the boiling point of impurity is all higher than solvent methyl ethyl ketone, and there are multiple multivariate azeotropes lower than methyl ethyl ketone boiling point), can't adopt typical Therefore, the difficulty of separation and desorption is large, which directly affects the treatment and utilization of n-butene hydration tail gas

Method used

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  • Desorption method of methyl-ethyl ketone rich solvent
  • Desorption method of methyl-ethyl ketone rich solvent
  • Desorption method of methyl-ethyl ketone rich solvent

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Experimental program
Comparison scheme
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Embodiment 1

[0051] In this embodiment, the conditions of the production device are simulated, and the experiment of removing impurities (desorption) in a rich solvent of methyl ethyl ketone is carried out.

[0052] 1. Experimental feedstock and desorption protocol

[0053] The composition of the rich solvent used in the experiment is: methyl ethyl ketone 91.9%, sec-butanol SBA 1.7%, tert-butanol TBA 0.8%, sec-butyl ether SBE 0.3%, water (100°C) 2.5%, and about 2.8% C4 mixture.

[0054] The experiment included 3 steps of separation process: decarburization by evaporation technology; dehydration by hexane azeotropic distillation technology; removal of other impurities (SBA, TBA, SBE) by rectification technology to obtain MEK product with a purity of 99.7%.

[0055] 2. Experimental equipment

[0056] Decarburization IV is carried out in a beaker and a 4-hole constant temperature water bath.

[0057] The azeotropic distillation and rectification process are all carried out in the laborator...

Embodiment 2

[0067] exist figure 2 In the shown 30,000 tons / year methyl ethyl ketone production plant, with image 3 In the manner shown, the method of the present invention is implemented.

[0068] The hydrated tail gas enters the absorption-distillation tower, using methyl ethyl ketone as a solvent to remove impurities, and the purified C4 returns to the extraction distillation system, and the methyl ethyl ketone rich solvent produced in the absorption-distillation process first enters near the exit of the sec-butanol dehydrogenation reactor R-2, C4 is removed in V-202″, water is removed in C-251″, and then methyl ethyl ketone with a purity of 99.8% is obtained in the methyl ethyl ketone rectification tower, and the methyl ethyl ketone with a purity of 99.8% is returned to the absorption-distillation tower for continued use; while the methyl ethyl ketone The rectification column bottom stream is sent to the crude sec-butanol storage tank (i.e. product intermediate tank) V-302 " that ha...

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Abstract

This invention relates to a method for methylethyl ketone rich solvent desorption. Said method comprises (1) removing C4 from methylethyl ketone in an accumulator tank (V-202), then dewatering in a pretreating tower (C-251) through azeotropic distillation of hexane and water, and obtaining a mixture 1 composed of methylethyl ketone, SBA, TBA, SBE and other impurities at the bottom of the tower, and (2) separating the mixture 1 in a refining tower (C-252), and obtaining the products of methylethyl ketone with purity over 99% at the top of tower. In the invention, an optimized program is carried out in an existing device for methylethyl ketone production by mixing C4.

Description

technical field [0001] The invention relates to a methyl ethyl ketone rich solvent desorption absorption method which absorbs impurities in the tail gas of n-butene hydration reaction. Background technique [0002] In the process of producing methyl ethyl ketone from mixed carbon four (that is, hydrocarbons containing four carbon atoms), it includes the step of hydrating n-butene under the action of a catalyst—such as a cationic resin—to generate sec-butanol, wherein n-butene The one-way conversion rate of olefin is only 6%-8%, resulting in a large amount of unreacted n-butene in the mixture coming out of the reactor. Therefore, the carbon four recovered from the top of the decarbonization tower must be recycled. The recovered C4 is composed of n-butene, butane and impurities, and the impurities mainly include water, hydration reaction products and by-products. Most of the recovered C4 can be used as recycle C4, return to the hydration reaction syste...

Claims

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Application Information

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IPC IPC(8): C07C46/10C07C49/10
Inventor 任万忠张耀亨王文华苏芳云陈小平姚亚平许文友胡轶高维娜王桂敏
Owner SINOPEC LANZHOU GASOLINEEUM CHEM IND CORP