Azeotropic rectification device and method for separating propylene glycol monomethyl ether and water
A technology of propylene glycol methyl ether and azeotropic distillation, which is applied in the fields of azeotropic distillation, ether separation/purification, ether preparation, etc., can solve the problems of personnel health impact and serious benzene pollution, etc., achieve good social benefits and improve market competition force, reduce the effect of dosage
Active Publication Date: 2015-01-28
WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
View PDF2 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0006] Generally, the entrainer used to separate propylene glycol methyl ether and water is benzene, but benzene pollutes the environment very seriously, and it will also have a serious impact on the health of personnel operating the equipment
Method used
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
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0033] Feed composition:
[0034] composition
Propylene Glycol Methyl Ether
heavy component
water
Content (wt%)
35%～40%
5%
55%～60%
[0035] Batch rectification operation, one pot of waste liquid is processed every day, the processing capacity of each pot is 5 tons, and the processing time of each pot is 20 hours. The waste liquid 1 added with cyclohexane is all added to the rectification at one time In the still 2, the material in the rectifying still 2 is heated into steam by the still-type reboiler 3 and then rises to the top of the rectifying tower 5. The theoretical plate number of the rectifying tower is 75, the operating pressure is normal pressure, and the reflux ratio is 2 ~8, the temperature at the top of the tower is 65°C to 125°C, and the temperature at the bottom of the tower is 90°C to 140°C. The gas phase at the top of the rectification tower 5 is condensed into a liquid phase by the top condenser 6 of the rectific...
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
Login to View More Abstract
The invention discloses an azeotropic rectification device and method for separating propylene glycol monomethyl ether and water. The azeotropic rectification device and method are characterized in that cyclohexane is adopted as an entrainer; waste liquor containing propylene glycol monomethyl ether, water and cyclohexane is added to a rectification kettle once; a rectification column is directly connected with the rectification kettle; a kettle-type reboiler is arranged on the rectification kettle; the waste liquor is heated into steam through the kettle-type reboiler and then enters the rectification column; the material at the top of the column is condensed and then transferred into the a reflux ratio controller; if the material at the top of the column is an azeotrope of cyclohexane and water, the material is fed into a phase splitting tank for phase splitting, a water phase is extracted, and cyclohexane reflows; if the material at the top of the column is cyclohexane, recovered cyclohexane is obtained; if the material at the top of the column is a transition fraction of cyclohexane and propylene glycol monomethyl ether, the material is extracted into a transition fraction storage tank; if the material at the top of the column is propylene glycol monomethyl ether, a propylene glycol monomethyl ether product can be obtained; once materials in the kettle of the column are basically the heavy components of the waste liquor, the extracting at the top of the column is stopped, and the residual materials in the kettle are discharged from the bottom part of the rectification kettle. The device and method for separating propylene glycol monomethyl ether and water are efficient and environment-friendly.
Description
technical field [0001] The present invention belongs to the technical method of chemical industry separation process, more specifically relates to the device and the method of azeotropic batch rectification separation propylene glycol methyl ether and water. Background technique [0002] Propylene glycol methyl ether (PM) is a glycol ether solvent. The toxicity of propylene glycol ether to the human body is lower than that of ethylene glycol ether products, and it is a low-toxicity ether. Propylene glycol methyl ether has a faint ether smell, but no strong pungent smell, making it more widely used and safe. Due to the presence of both ether and hydroxyl groups in its molecular structure, it has excellent solubility, suitable volatilization rate and reactivity, and has been widely used. Propylene glycol methyl ether is mainly used as solvent, dispersant, thinner, fuel antifreeze, extractant, paint and cleaning agent, etc. Used in coatings, inks, printing and dyeing, pestici...
Claims
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 Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/13C07C41/42B01D3/36
Inventor 杨桂兵陈琪迪建东朱绪顺
Owner WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD