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Method for separating ethylene glycol, propanediol and butanediol

A technology of propylene glycol and butanediol, which is applied in the separation/purification of hydroxyl compounds, organic chemistry, etc., can solve the problem of high energy consumption, and achieve the effect of low energy consumption for separation and energy saving

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problem of high energy consumption when ethylene glycol, propylene glycol and butanediol are separated by azeotropic rectification at present, and a new method for separating ethylene glycol, propylene glycol and butanediol is provided

Method used

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  • Method for separating ethylene glycol, propanediol and butanediol
  • Method for separating ethylene glycol, propanediol and butanediol

Examples

Experimental program
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Effect test

Embodiment 1

[0014] according to figure 1 Shown flow process, water is with 2.00 g / min, methyl alcohol is with 4.00 g / min and raw material (ethylene glycol mass fraction is 85%, and 1,2-propanediol mass fraction is 10%, the quality of 1,2-butanediol Fraction is 5.00%) with 5.00 g / min respectively from the 1st, 3rd and 6th beds of the simulated moving bed with bed number of 10, and Su Qing brand DA201-C resin is filled in the bed, operating pressure is normal pressure, operating The temperature is 40°C and the space velocity is 1.5hr -1 , the flow rate of the mixture of resolving agent and 1,2-butanediol from bed 2 is 1.50 g / min, the flow rate of the mixture of resolving agent and 1,2-propylene glycol from bed 4 is 3.25 g / min, Layer 9 obtains the mixture flow rate of resolving agent and ethylene glycol to be 5.25 g / min, and the three streams of extraction pass through 1,2-butanediol separation tower, 1,2-propanediol separation tower and ethylene glycol separation tower respectively, and pa...

Embodiment 2

[0016] by similar figure 1 Shown flow process, methyl alcohol is with 0.50 g / min, ethanol with 0.50 g / min and raw material (ethylene glycol mass fraction is 95%, 1,3-propanediol mass fraction is 3%, 1,4-butanediol mass fraction 2%) with 5.00 g / min respectively from the 1st, 3rd and 5th bed layers of the simulated moving bed with 6 bed layers, the Su Qing brand DA201-A resin is filled in the bed layer, the operating pressure is 1MPa, and the operating temperature is 20℃, space velocity is 0.2hr -1 , the flow rate of the mixture of resolving agent and 1,4-butanediol from bed 2 is 0.40 g / min, the flow rate of the mixture of resolving agent and 1,3-propylene glycol from the 4th bed layer is 0.45 g / min, from the bed Layer 6 obtains the mixture flow rate of resolving agent and ethylene glycol to be 5.15 g / min, and the three streams of extraction pass through 1,4-butanediol separation tower, 1,3-propanediol separation tower and ethylene glycol separation tower respectively, and pass...

Embodiment 3

[0018] by similar figure 1Shown flow process, methyl alcohol is with 10.00 g / min, acetone is with 10.00 g / min and raw material (ethylene glycol mass fraction is 60%, 1,2-propanediol mass fraction is 15%, 1,3-butanediol mass fraction 25%) at 5.00 g / min respectively from the 1st, 8th and 20th beds of the simulated moving bed with 30 bed layers, filled with Su Qing brand DA201-D resin in the bed layer, the operating pressure is 0.5MPa, and the operating temperature 50℃, space velocity 5.0hr -1 , from the bed layer 6, the flow rate of the mixture of resolving agent and 1,3-butanediol is 9.65 g / min, and the flow rate of the mixture of resolving agent and 1,2-propylene glycol from the 15th bed layer is 8.75 g / min. Layer 26 obtains the flow rate of the mixture of resolving agent and ethylene glycol to be 6.60 g / min, and the three streams produced are respectively through 1,3-butanediol separation tower, 1,2-propanediol separation tower and ethylene glycol separation tower. Ordinary...

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Abstract

The invention relates to a method for separating ethylene glycol, propanediol and butanediol. By the method, the problem of high energy consumption during azeotropic distillation separation of the ethylene glycol, the propanediol and the butanediol at present is mainly solved. The method sequentially comprises the following steps that: raw materials containing the ethylene glycol, the propanediol and the butanediol, a desorption agent I and a desorption agent II enter a raw material feed bed, a desorption agent I feed bed and a desorption agent II feed bed of a simulation moving bed device filled with an adsorbent, wherein extraction liquid I is a mixture of the propanediol and the desorption agents, extraction liquid II is a mixture of the butanediol and the desorption agents, and raffinate is a mixture of the ethylene glycol and the desorption agents; and the extraction liquid I, the extraction liquid II and the raffinate are rectified normally to form the ethylene glycol, the propanediol and the butanediol. Through the technical scheme, the problem is better solved. The method can be used for the industrial production of separating the ethylene glycol, the propanediol and the butanediol.

Description

technical field [0001] The invention relates to a method for separating ethylene glycol, propylene glycol and butanediol. Background technique [0002] Ethylene glycol (EG) is an important organic chemical raw material, mainly used in the production of polyester fiber, antifreeze, unsaturated polyester resin, lubricant, plasticizer, nonionic surfactant and explosives, etc. It can be used in industries such as paint, photographic developer, brake fluid and ink, as a solvent and medium for ammonium perborate, and for the production of special solvents such as glycol ether, etc., and has a wide range of uses. [0003] At present, large-scale ethylene glycol production at home and abroad adopts the process route of direct hydration or pressurized hydration. This process is to prepare a mixed aqueous solution of ethylene oxide and water at a ratio of 1:20 to 22 (molar ratio) in a fixed bed. React in the reactor at 130-180°C, 1.0-2.5MPa for 18-30 minutes, all ethylene oxide is co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/76
Inventor 肖剑钟禄平陈亮
Owner CHINA PETROLEUM & CHEM CORP
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