Rectification method for separating ethylene glycol and 1,2-butanediol

A technology of ethylene glycol and butanediol, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of long process, low investment and short process of rectification and separation, and reduce operating costs , Simplify the process flow and reduce the cost of equipment

Active Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] What the present invention aims to solve is the technical problem of long rectification and separation process flow, large investment and high energy consumption when separating ethylene glycol and 1,2-butanediol in the prior art, and provides a method for separating ethylene glycol and 1,2-butanediol. , The rectification method of 2-butanediol has the advantages of short flow process, low investment and low energy consumption

Method used

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  • Rectification method for separating ethylene glycol and 1,2-butanediol
  • Rectification method for separating ethylene glycol and 1,2-butanediol
  • Rectification method for separating ethylene glycol and 1,2-butanediol

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Embodiment 1

[0030] according to figure 1 In the body of the dividing wall distillation tower shown, the total number of theoretical plates is 60, and the number of theoretical plates in the dividing wall section is 40. The partitions of the dividing wall section are placed along the axial direction, and the raw material inlet is located on the side of the dividing wall section and counted from top to bottom. At the 10th theoretical plate, the inlet of the entrainer is located at the 5th theoretical plate from top to bottom in the public rectification section. Raw materials composed of 85% ethylene glycol and 15% 1,2-butanediol by weight are added from the raw material import, and the entrainer (substituent R 1 , R 2 , R 3 and R 4 Respectively: -H, -H, -CH 3 ,-(CH 2 ) 4 CH 3 ) from the entrainer inlet, the mol ratio of ethylene glycol in the entrainer to the raw material is 1.5:1, the operating pressure of the dividing wall rectification column is normal pressure, the reflux ratio i...

Embodiment 2

[0033] according to figure 1 The body of the dividing wall rectification column shown has a total number of theoretical plates of 45 and a theoretical plate number of 30 in the dividing wall section. At the 8th theoretical plate, the inlet of the entrainer is located at the 5th theoretical plate from top to bottom in the public rectification section. Raw materials composed of 60% ethylene glycol and 40% 1,2-butanediol by weight are added from the raw material import, and the entrainer (substituent R 1 , R 2 , R 3 and R 4 Respectively: -H, -H, -CH 3 ,-(CH 2 ) 4 CH 3 ) from the entrainer inlet, the entrainer and the mol ratio of ethylene glycol in the raw material are 1.5:1, the operating pressure of the dividing wall rectification column is 50KPa, the reflux ratio is 25, and the liquid phase distribution ratio is 2 (I / II), the temperature at the top of the tower is 156°C, the temperature on the feed side of the dividing wall section of the tower is 185°C, and the tempe...

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Abstract

The invention relates to a rectification method for separating ethylene glycol and 1,2-butanediol, which mainly solves the technical problems of long rectification separation process, high investment and high energy consumption in the ethylene glycol and 1,2-butanediol separation process in the prior art. The method comprises the following steps: a raw material containing ethylene glycol and 1,2-butanediol enters a divisional rectification tower divisional section feed side (I), the ethylene glycol and a fresh azeotrope former added from a phase splitter form an azeotrope which is distilled off from the tower top, the supernatant azeotrope-former-rich phase subjected to condensation phase splitting returns to a divisional rectification tower common rectifying section (III) to continue participating in azeotropy, the understratum ethylene-glycol-rich phase is mixed with the raw material and returns to the divisional section feed side (I) to continue refinement, and separation is performed to obtain the ethylene glycol at the bottom of the divisional section feed side and obtain the 1,2-butanediol from the bottom of the other side (II) of the divisional section. The technical scheme well solves the technical problems, and can be used for industrial production for separating ethylene glycol and 1,2-butanediol.

Description

technical field [0001] The invention relates to a rectification method for separating ethylene glycol and 1,2-butanediol. Background technique [0002] Ethylene glycol is an important basic organic chemical raw material, mainly used for copolymerization with terephthalic acid to produce polyethylene terephthalate (PET). In addition, ethylene glycol can also be used in the production of antifreeze, lubricants, plasticizers, non-ionic surfactants and explosives, etc., and has a wide range of uses. my country is a big consumer of ethylene glycol. The current domestic output of ethylene glycol is far from meeting the demand, and it has a good development prospect. [0003] 1,2-Butanediol is also an organic chemical raw material. Due to its extremely low viscosity and freezing point, it is mainly used as a diol monomer for modification of polyester and polyurethane resins, and as a raw material for the production of plasticizers for PVC resins. In addition, 1,2-butanediol can a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/82
CPCC07C29/82C07C31/202C07C31/207
Inventor 郭艳姿
Owner CHINA PETROLEUM & CHEM CORP
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