Separation method and separation device of synthesis gas ethylene glycol product

Abstract

The invention discloses a separation method and a separation device of a synthesis gas ethylene glycol product. The separation method comprises the steps of 1), allowing the raw synthesis gas ethylene glycol product to enter an effluent fraction tower, obtaining a light component, a mixture of methyl glycolate and dimethyl oxalate, and a heavy component respectively, 2), allowing the light component to enter a dividing wall rectifying tower, extracting methanol from the tower top, extracting an ethanol solution containing little water from a side line, 3), allowing the mixture containing methyl glycolate and dimethyl oxalate to enter a common rectifying tower, extracting methyl glycolate from the tower top, extracting dimethyl oxalate from a tower kettle, 4), allowing the heavy component to enter a scraper molecular evaporation tower I, extracting ethylene glycol from an inner wall of the tower, extracting a mixture of 1,2-propylene glycol and 1,2-butanediol from an outer wall, allowing partial mixing solution to return to the scraper molecular evaporation tower I, allowing partial mixing solution to return to a scraper molecular evaporation tower II, and 5), extracting 1,2-propylene glycol from an inner wall of the scraper molecular evaporation tower II, and extracting 1,2-butanediol from an outer wall of the scraper molecular evaporation tower II. According to the method and the device, each product is separated effectively, and the method has the characteristics of simple technology and low energy consumption.

Description

technical field [0001] The invention relates to a synthesis method and a separation device for a product of synthesis gas to produce ethylene glycol. Background technique [0002] Ethylene glycol, English name ethylene glycol, also known as "glycol", "1,2-ethylene glycol", referred to as EG, is an important organic chemical raw material, mainly used in the production of polyester fibers, lubricants , plasticizers, nonionic surfactants, coatings, inks, etc., are widely used. [0003] In 2013, my country's annual production capacity of ethylene glycol was close to 4 million tons, but the domestic demand for ethylene glycol is expected to be around 12 million tons, and the market gap is huge. Although the traditional petrochemical route to prepare ethylene glycol is a mature technology, with the decreasing crude oil resources, it is imperative to open up a new chemical route. [0004] my country has abundant coal resources, how to deeply process coal and produce high value-ad...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the product separation and introduction of a third solvent in the synthesis gas to ethylene glycol process leads to complex processes and high energy consumption. A new full-flow separation process and the device used in the process are provided. Designed to effectively separate each product

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