Method for separating glycol and butylene glycol

A technology of butanediol and ethylene glycol, which is applied in the field of separation of ethylene glycol and butanediol, can solve the problem of high energy consumption of separation, and achieve the effect of low energy consumption of separation, good technical effect, and total 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 separation energy consumption when ethylene glycol a

Method used

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  • Method for separating glycol and butylene glycol
  • Method for separating glycol and butylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0013] [Example 1]

[0014] press figure 1 In the process shown, the mixture of methanol and ethylene glycol and 1,2-butanediol at 3.00 g / min (the mass fraction of 1,2-butanediol is 15.00%) is separated from the bed at 5.00 g / min. The first and fourth beds of the simulated moving bed of 8, filled with Suqing brand DA201-C resin, the operating pressure is normal pressure, the operating temperature is 40℃, and the space velocity is 1.5 hours -1 , The flow rate of the mixture of desorbing agent and 1,2-butanediol obtained from bed 2 is 2.75 g / min, and the flow rate of the mixture of desorbing agent and ethylene glycol obtained from bed 7 is 5.25 g / min. The liquid is separated by 1,2-butanediol separation tower and ethylene glycol separation tower, and through ordinary distillation, the mass concentration of 1,2-butanediol is 99.95%, the mass concentration of ethylene glycol is 99.99%, and the analytical reagent is recovered. The mass concentration is 100.00%, and the required disti...

Example Embodiment

[0015] [Example 2]

[0016] Press similar figure 1 In the process shown, water is mixed with a mixture of ethylene glycol and 1,4-butanediol at 0.5 g / min (the mass fraction of 1,4-butanediol is 1.00%) from the bed at 5.0 g / min. The first and third beds of a simulated moving bed of 4, filled with Suqing brand DA201-A resin, the operating pressure is 1MPa, the operating temperature is 20℃, and the space velocity is 0.2 hours -1 , The flow rate of the mixture of desorbent and 1,4-butanediol obtained from bed 3 is 0.45 g / min, and the flow rate of the mixture of desorbent and ethylene glycol obtained from bed 4 is 5.05 g / min. The liquid is separated by the 1,4-butanediol separation tower and the ethylene glycol separation tower. Through ordinary distillation, the mass concentration of 1,4-butanediol is 98.15%, the mass concentration of ethylene glycol is 100.00%, and the analytical reagent is recovered. The mass concentration is 100.00%, and the required distillation energy consumpti...

Example Embodiment

[0017] [Example 3]

[0018] Press similar figure 1 In the process shown, the mixture of acetone and ethylene glycol and 1,3-butanediol (the mass fraction of 1,3-butanediol is 80.00%) is separated from the bed at 5.00 g / min at 10.00 g / min. The first and fourteenth beds of a simulated moving bed of 24. The bed is filled with Suqing brand DA201-D resin. The operating pressure is 0.5MPa, the operating temperature is 50℃, and the space velocity is 5.0 hours-1. 6 The flow rate of the mixture of analytical agent and 1,3-butanediol is 10.65 g / min, the flow rate of the mixture of analytical agent and ethylene glycol obtained from bed 22 is 4.35 g / min, the extraction liquid and the raffinate are passed through 1 , The 3-butanediol separation tower and the ethylene glycol separation tower are separated. Through ordinary distillation, the mass concentration of 1,3-butanediol is 99.99%, the mass concentration of ethylene glycol is 99.99%, and the mass concentration of the recovered analytica...

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Abstract

The invention relates to a method for separating glycol and butylene glycol, and mainly aims to solve the problem of high separation energy consumption in separation of glycol and butylene glycol through azeotropic rectification. The method comprises the steps of: putting a glycol solution with butylene glycol content higher than 1% and a strippant into the raw material feeding bed and the strippant feeding bed of a simulated moving bed instrument loaded with an adsorbent, with the extraction solution mixed by the strippant and butylene glycol, and the raffinate mixed by the strippant and glycol, subjecting the extraction solution to separation in a butylene glycol separation tower, recovering the strippant from the tower top, and collecting butylene glycol from the tower kettle, delivering the raffinate into a glycol separation tower, recovering the strippant from the tower top, and collecting glycol from the tower kettle, with the adsorbent selected from at least one of nonfunctional resin or a molecular sieve, and the strippant selected from at least one of polar solvents. The technical method provided in the invention solves the problem well, and can be used in industrial production of glycol and butylene glycol separation.

Description

technical field [0001] The invention relates to a method for separating ethylene 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 converted into mixed...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/76
Inventor 钟禄平肖剑卢咏琰
Owner CHINA PETROLEUM & CHEM CORP
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