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Separation method of toluene, methanol, isopropanol and dimethyl carbonate mixture

A technology of dimethyl carbonate and separation method, applied in the purification/separation of carbonate/haloformate, preparation of organic compounds, distillation purification/separation, etc., can solve separation difficulties, environmental pollution, and processing costs higher question

Inactive Publication Date: 2014-05-28
YANTAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] There are often a lot of waste in chemical production. These wastes contain a variety of chemical raw materials. Due to the complexity and separation of components, they are taken out of hazardous waste for disposal. The cost of disposal is high, and it is easy to cause pollution to the environment.

Method used

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  • Separation method of toluene, methanol, isopropanol and dimethyl carbonate mixture
  • Separation method of toluene, methanol, isopropanol and dimethyl carbonate mixture
  • Separation method of toluene, methanol, isopropanol and dimethyl carbonate mixture

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Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1 A kind of separation method of toluene, methyl alcohol, Virahol, dimethyl carbonate mixture, the steps are as follows:

[0039] (1) The waste solvent containing toluene, methyl alcohol, isopropanol, dimethyl carbonate mixture first enters the middle part of the first extractive distillation tower, and the first solvent enters the first extractive distillation tower top, and in the first extractive distillation tower Realize the separation of alcohol and dimethyl carbonate, toluene, methanol and isopropanol mixture are obtained at the top of the tower, and the bottom of the tower is a mixture containing solvent, dimethyl carbonate and toluene;

[0040] (2) methanol and isopropanol mixture at the top of the first extractive distillation tower enter the alcohol separation tower again, the top of the alcohol separation tower obtains methanol, and the tower still obtains isopropanol;

[0041] (3) the first extractive distillation column tower still solvent, tolu...

Embodiment 2

[0048] Embodiment 2 A kind of separation method of toluene, methyl alcohol, Virahol, dimethyl carbonate mixture, step is identical with embodiment 1. The raw materials are waste materials containing 10% by mass percentage of methanol, 30% of dimethyl carbonate, 30% of toluene, and 30% of isopropanol. The extraction and rectification solvent uses m-xylene. The first extractive distillation column has 60 theoretical plates, and the second There are 70 theoretical plates in the extractive distillation tower, 30 theoretical plates in the alcohol separation tower, and 60 theoretical plates in the toluene tower.

[0049] Table 2 is the solvent separation waste with m-xylene

[0050]

[0051]

[0052] As can be seen from the above table 2, the separation of methyl alcohol, dimethyl carbonate, isopropanol and toluene can be realized by using m-xylene as a solvent, but the purity of dimethyl carbonate is greater than 97%, the purity of methanol is greater than 99%, and the purity...

Embodiment 3

[0053]Embodiment 3 A kind of separation method of toluene, methyl alcohol, Virahol, dimethyl carbonate mixture, step is identical with embodiment 1. The raw materials are waste materials containing 10% by mass percentage of methanol, 30% of dimethyl carbonate, 30% of toluene, and 30% of isopropanol. The extractive distillation solvent uses p-xylene. The first extractive distillation column has 60 theoretical plates, and the second There are 70 theoretical plates in the extractive distillation tower, 30 theoretical plates in the alcohol separation tower, and 60 theoretical plates in the toluene tower.

[0054] Table 3 uses p-xylene as solvent separation waste

[0055]

[0056]

[0057] As can be seen from the above table 3, the separation of methanol, dimethyl carbonate, isopropanol and toluene can be realized by using p-xylene as a solvent, but the purity of dimethyl carbonate is greater than 97%, the purity of methanol is greater than 99%, and the purity of isopropanol ...

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Abstract

The invention relates to a separation method of a toluene, methanol, isopropanol and dimethyl carbonate mixture. An apparatus used for realizing the method comprises a first extraction rectifying tower, a second extraction rectifying tower, an alcohol separating tower and a toluene tower, and o-xylene, m-xylene and p-xylene are adopted to extract and rectify toluene, methanol, isopropanol and dimethyl carbonate. The purity of each of products comprising toluene, methanol, isopropanol and dimethyl carbonate is high, and the separation cost is low.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and relates to a separation method and equipment for a mixture of toluene, methanol, isopropanol and dimethyl carbonate, in particular to a method for separating toluene, methanol, isopropanol and dimethyl carbonate by using extraction and rectification technology. Ester methods and apparatus. Background technique [0002] There are often many wastes in chemical production. These wastes contain a variety of chemical raw materials. Due to the complexity and separation of components, they are taken out as hazardous wastes for disposal. The cost of disposal is high and it is easy to pollute the environment. Chemical production waste is actually a chemical raw material that cannot be used. The reason why it cannot be used is that the composition is complex and difficult to separate. If the components can be separated, waste can be turned into treasure, which not only generates benefits but also reduces ...

Claims

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Application Information

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IPC IPC(8): C07C15/06C07C7/06C07C31/04C07C31/10C07C29/82C07C69/96C07C68/08B01D3/40
Inventor 王文华冯咏梅程贤阳韩晓莉李云飞吕洪涛王娇娇
Owner YANTAI UNIV
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