Method for separating dichlorohydrin from compound

A technology of dichloropropanol and mixture, applied in the field of preparation of epichlorohydrin, can solve the problems of increasing reaction unit consumption, polluting the environment, large amount of waste water, etc., achieving high recovery rate, reducing environmental pollution and increasing production cost. Effect

Inactive Publication Date: 2009-09-23
SHANGHAI CHLOR ALKALI CHEM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the above method, the gas phase reaction product generated by the reaction is continuously discharged, and the discharged gas phase reaction product contains dichloropropanol with a weight concentration of 35-60%. If it is not recycled, the unit consumption of the reaction will be increased. , there is also the problem of polluting the environment
[0005] At present, conventional recycling has the disadvantages of high energy consumption and large amount of waste water. Therefore, it is necessary to research and develop a new method for separating dichloropropanol from mixtures.

Method used

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  • Method for separating dichlorohydrin from compound
  • Method for separating dichlorohydrin from compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Extraction tower: sieve plate tower with 3 balance stages.

[0026] The mixture of dichloropropanol, hydrogen chloride and water is sent into the extraction tower 1 from the upper part, and the extractant is sent into the extraction tower 1 from the lower part for countercurrent extraction, and the extractant containing dichloropropanol is discharged from the top of the extraction tower and sent to the subsequent The rectifying tower, the raffinate phase is discharged from the bottom of the extraction tower 1.

[0027] In the mixture, the weight content of 1,3-dichloro-2-propanol is 40.2%, the weight content of 1,2-dichloro-3-propanol is 5%, and in the mixture, the weight content of hydrogen chloride is 27%, The weight content of water is 27.8%;

[0028] The extractant is n-octanol; the weight ratio of the mixture of dichloropropanol, hydrogen chloride and water to the extractant is:

[0029] The mixture of dichloropropanol, hydrogen chloride and water: extractant=1: ...

Embodiment 2

[0033] Extraction tower: It adopts a rotating disk tower with 5 balance stages.

[0034] The mixture of dichloropropanol, hydrogen chloride and water is sent into the extraction tower 1 from the upper part, and the extractant is sent into the extraction tower 1 from the lower part for countercurrent extraction, and the extractant containing dichloropropanol is discharged from the top of the extraction tower and sent to the subsequent The rectifying tower, the raffinate phase is discharged from the bottom of the extraction tower 1.

[0035] In the mixture, the weight content of 1,3-dichloro-2-propanol is 40.2%, the weight content of 1,2-dichloro-3-propanol is 5%, and in the mixture, the weight content of hydrogen chloride is 27%, The weight content of water is 27.8%;

[0036] Described extractant is n-butyl ether;

[0037] The weight ratio of the mixture of dichloropropanol, hydrogen chloride and water to the extractant is:

[0038] The mixture of dichloropropanol, hydrogen ...

Embodiment 3

[0042] use figure 2 process.

[0043] Extraction tower: It adopts a rotating disk tower with 5 balance stages.

[0044] The mixture of dichloropropanol, hydrogen chloride and water is sent into the extraction tower 1 from the lower part, and the extractant is sent into the extraction tower 1 from the upper part for countercurrent extraction, and the extractant containing dichloropropanol is discharged from the top of the extraction tower and sent to the subsequent The rectifying tower, the raffinate phase is discharged from the top of the extraction tower 1.

[0045] In the mixture, the weight content of 1,3-dichloro-2-propanol is 40.2%, the weight content of 1,2-dichloro-3-propanol is 5%, and in the mixture, the weight content of hydrogen chloride is 27%, The weight content of water is 27.8%;

[0046] The extractant is 1,2-dichloroethane;

[0047] The weight ratio of the mixture of dichloropropanol, hydrogen chloride and water to the extractant is:

[0048] The mixture ...

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Abstract

The invention provides a method for separating dichlorohydrin from compound, comprising the following steps: mixing the compound of dichloropropanol, chlorine hydride and water with extraction agent; then collecting the extraction agent containing dichloropropanol and adopting the method of rectification to obtain dichloropropanol by separation. The method of the invention uses the method of extraction to recover the dichloropropanol in the gas phase, thus not increasing production cost while reducing environmental pollution and achieving good separation effect and high recovery rate; in particular, the resolved solvent can still be recovered and reused, therefore, in many cases, the advantages in terms of technology, economy and environmental protection are demonstrated. Cross current solvent extraction is carried out on N-butyl ether on a four-stage basis, extraction yield of dichloropropanol reaches 91%; cross current solvent extraction is also carried out on n-octyl alcohol on a four-stage basis, the extraction yield of the dichloropropanol reaches 99%; cross current solvent extraction is also carried out on dutch liquid on a five-stage basis, the extraction yield of the dichloropropanol reaches 91%.

Description

technical field [0001] The invention relates to a method for preparing epichlorohydrin, in particular to a method for separating dichloropropanol, an intermediate used for preparing epichlorohydrin, from a gas phase product mixture of glycerol hydrochlorination. Background technique [0002] Epichlorohydrin, also known as epichlorohydrin, is an important organic chemical raw material and fine chemical product, mainly used in the production of epoxy resin. The application fields of epoxy resin mainly include coatings, composite materials, electronic appliances, adhesives and other fields. [0003] At present, in the synthesis method of epichlorohydrin, the production of epichlorohydrin with glycerol as raw material is a process method in line with contemporary circular economy. The saponification reaction of chloropropanol produces epichlorohydrin. One of the characteristics of this technical route is that the intermediate dichloropropanol produced has a high concentration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/36C07C29/86C07C29/80
Inventor 岳群蒋鹏袁向前宋宏宇袁茂全胡妹华
Owner SHANGHAI CHLOR ALKALI CHEM
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