Method for separating dichloropropanol from dichloropropanol hydrochloric acid solution through alkane azeotrope agent

A technology of dichloropropanol hydrochloric acid and dichloropropanol, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry and other directions, can solve the problems of pollution, waste of resources, environment, complicated operation procedures, etc., and achieves high purity, The effect of low recovery rate and simple operation

Active Publication Date: 2019-01-04

SHANDONG TAIHE WATER TREATMENT TECH CO LTD

6 Cites 5 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0005] In order to solve the problems of relatively cumbersome operation procedures, waste of resources and environmental pollution in the prior art,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Abstract

The invention discloses a method for separating dichloropropanol from a dichloropropanol hydrochloric acid solution through an alkane azeotrope agent. The method specifically comprises the following steps: adding the alkane azeotrope agent which is subjected to azeotropy with water to a dichloropropanol hydrochloric acid water solution; heating until the system reaches azeotropy; rectifying and cooling to separate a hydrochloric acid solution and the alkane azeotrope agent from a rectified component; distilling the non-rectified components under normal pressure to obtain high-purity dichloropropanol; and recycling the alkane azeotrope agent. The method is simple to operate; the complicated operation of extracting in a plurality of times is avoided; the separation efficiency is high; the cost is low; all materials can be recycled; the raw material utilization rate is high; and the environmental pollution is reduced.

Application Domain

Organic compound preparationHydroxy compound preparation

Technology Topic

ChemistryAlkane +5

Examples

Experimental program(5)

Example Embodiment

[0023] Example 1

[0024] (1) Add 200 g of cyclohexane and 200 g of dichloropropanol hydrochloric acid solution into a three-necked flask. The upper part of the three-necked flask is connected to a rectification column, condenser, water separator and exhaust gas absorption device in sequence. The rectification column is filled with glass Spring, the packing method is random pile; the three-necked flask is heated by the oil bath to make the azeotropic system reflux, the temperature is about 70 ℃, the azeotropic distillation time of the system is 7h, and the rectification components are separated by the water separator to obtain the mass fraction It is 125 g of 23% hydrochloric acid solution, the recovery rate is 96.15%, and the residual organic solvent is 10 ppm;

[0025] (2) The mixture of dichloropropanol and cyclohexane was distilled and separated at 82 ± 1℃ to obtain 67.48 g of dichloropropanol with a recovery rate of 96.4% and a purity of 99.2%;

[0026] (3) The cyclohexane separated and recovered in the combined steps (1) and (2) totals 198 g, the recovery rate is 99%, and the recovered cyclohexane can be recycled.

Example Embodiment

[0027] Example 2

[0028] (1) Place 200 g of n-hexane and 200 g of dichloropropanol hydrochloric acid solution in a three-necked flask. The upper part of the three-necked flask is connected to a rectification column, condenser, water separator and exhaust gas absorption device in sequence. West ring, spiral ring; the three-necked flask is heated by an oil bath to make the azeotropic system reflux, the temperature is about 62 ℃, the azeotropic distillation time of the system is 8 h, and the rectified components are separated by a water separator to obtain a mass fraction of 24 122 g of% hydrochloric acid solution, the recovery rate is 93.85%, and the residual organic solvent is 25 ppm;

[0029] (2) The mixture of dichloropropanol and n-hexane was distilled and separated at 70 ± 1℃ to obtain 67.27 g of dichloropropanol, with a recovery rate of 96.1% and a purity of 99.1%;

[0030] (3) Combine steps (1) and (2) to separate and recover 196 g of n-hexane, with a recovery rate of 98%. The recovered n-hexane can be recycled.

Example Embodiment

[0031] Example 3

[0032] (1) Put 400 g of cyclohexane and 200 g of dichloropropanol hydrochloric acid solution into a three-necked flask, place the three-necked flask in an oil bath, and connect the rectification column, condenser, water separator and tail gas to the upper part of the three-necked flask in sequence The packing of the absorption device and the rectification column is saddle-shaped, and the packing method is random pile; the three-necked flask is heated by the oil bath to make the azeotropic system reflux, the temperature is about 70℃, and the azeotropic distillation time of the system is 5 h. The rectified components are separated by a water separator to obtain 120 g of a 24.1% hydrochloric acid solution with a recovery rate of 92.3% and a residual organic solvent of 20 ppm;

[0033] (2) Dichloropropanol and cyclohexane mixture were distilled and separated at 82 ± 1℃ to obtain 67.9 g of dichloropropanol, with a recovery rate of 97.0% and a purity of 99.3%;

[0034] (3) Combine steps (1) and (2) to separate and recover 392 g of cyclohexane, with a recovery rate of 98%. The recovered cyclohexane can be recycled.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to view more

PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to view more

Classification and recommendation of technical efficacy words

Increase cost
Low recovery rate

Method for separating dichloropropanol from dichloropropanol hydrochloric acid solution through alkane azeotrope agent

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

Similar technology patents

Toner supply roll

Method for reconcentrating and recycling reverse osmosis concentrated brine in reclaimed water recycling device

Treatment method for stripping ABS (Acrylonitrile Butadiene Styrene) electroplated part

Production method for medium-silicon low-carbon low-phosphorus manganese block ferroalloy

Picking method for fresh tea leaves

Classification and recommendation of technical efficacy words

Sequential Selective Epitaxial Growth

Method and apparatus for monitoring cardio-pulmonary health

Full-automatic modeling approach of three dimensional faces based on phase deviation scanning

Optical pickup device and optical disk apparatus

Combined purification method for effluvial exhaust air

Method for extracting vanadium by using vanadium slag mixed alkali roasting

On-line KR desulfuration residue treatment device and method applied to hot metal pretreatment process

Toner supply roll

Treatment method for stripping ABS (Acrylonitrile Butadiene Styrene) electroplated part

Production method for medium-silicon low-carbon low-phosphorus manganese block ferroalloy