A method and device for removing dichloromethane in high-boiling heat-sensitive materials
A heat-sensitive material, dichloromethane technology, applied in separation methods, chemical instruments and methods, fractional distillation, etc., can solve the problems of difficult to remove dichloromethane, short process flow, large operation flexibility, etc., and achieve good economic benefits and short process. , the effect of convenient operation
Active Publication Date: 2021-11-09
TIANJIN UNIV OF SCI & TECH
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The present invention aims at a method and device for removing dichloromethane in high-boiling heat-sensitive materials, and adopts the method of absorption and distillation to solve the existing problem that it is difficult to remove a small amount of dichloromethane in high-boiling heat-sensitive materials, and the process flow of this method is short , suitable for materials with high boiling point heat sensitivity, etc., with large operating flexibility
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
[0039] The present invention will be further described in detail in conjunction with implementation examples and accompanying drawings.
[0040] The composition and related parameters of the high-boiling heat-sensitive material containing dichloromethane are as follows:
[0041] The mass fraction containing dichloromethane is 92%, the processing capacity is 20 tons per day, and the feed temperature is 30°C.
[0042] The method and device shown in the figure are adopted, and the specific parameters are shown in the table:
[0043]
[0044] Through the method and device, the dichloromethane in the high-boiling heat-sensitive material is removed, and the dichloromethane is recovered, and the semi-continuous operation mode is adopted, including the following four stages:
[0045] The material containing 92% (mass) of methylene chloride is continuously sent to the tower kettle by the feed pump, and when the liquid level reaches 60%, the circulation pump is opened to heat the fa...
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 belongs to the field of high-vacuum refining of high-boiling-point heat-sensitive materials, and discloses a method and device for removing dichloromethane from high-boiling-point heat-sensitive materials. , secondary condenser, receiving tank, circulating pump, kettle liquid cooler, etc. Applying the method of the present invention, the heat-sensitive material with high boiling point containing dichloromethane enters the tower kettle tank through the feed pump, enters the falling film reboiler through the circulation pump, the gas-liquid mixture enters the tower kettle tank, and the gas phase from the tower kettle tank enters In the rectification tower, the gas phase at the top of the tower is condensed by the primary condenser, and the condensate is collected and passed through the reflux distributor, part of which is recovered and part of which is refluxed. As the dichloromethane content in the tower still decreases and the system pressure becomes lower and lower, the gas phase at the top of the tower cannot be condensed, and the still liquid is cooled as reflux to remove the dichloromethane in the residual still liquid. Adopting this technical scheme, the temperature of the tower kettle can be effectively controlled to avoid the decomposition or polymerization of the kettle liquid. The device can adopt semi-continuous operation with large operation flexibility, and is suitable for refining high-boiling heat-sensitive materials containing light components.
Description
technical field [0001] The invention belongs to the field of high-vacuum refining of high-boiling-point heat-sensitive materials, and in particular relates to a method and a device for removing methylene chloride from high-boiling-point heat-sensitive materials. Background technique [0002] As a non-combustible solvent, dichloromethane can be used as a solvent and extractant for various organic polymers, such as spices. After various treatments, dichloromethane needs to be removed, and these are mostly heat-sensitive materials with high boiling points. Rectification is the most basic method to achieve separation. In the conventional rectification process, the method of reducing pressure is often used, which can effectively reduce the temperature required in the rectification process, thereby avoiding the decomposition or polymerization of some substances due to heat. However, for materials with high boiling points and heat sensitivity, it is not suitable to use ordinary vac...
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 & AuthorityPatents(China)
IPC IPC(8): B01D3/14B01D3/32
CPCB01D3/14B01D3/322
Inventor王红星郑广强李海勇李飞
OwnerTIANJIN UNIV OF SCI & TECH