Device and method for eliminating and recycling organic solvent from cathode electrophoresis emulsion

A cathodic electrophoresis, organic solvent technology, applied in steam distillation and other directions, can solve the problems of difficult operation stability control, large loss of effective solvent, imperfect solvent recovery, etc., to avoid low removal efficiency, zero-emission process operation, effective Stabilizing effect of solvent content and other conventional physical parameters

Active Publication Date: 2015-09-16
湖南湘江关西涂料有限公司
View PDF15 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The further technical problem to be solved by the present invention is to provide a method that overcomes the difficulty in controlling the stability of the system during the desolventization process in the prior art, the large loss of effective solvent for the feed liquid before and after desolventization, complex process operation, and imperfect solvent recovery. The problem is to efficiently remove and recover low-boiling point organic solvents under looser conditions, and to remove and recover organic solvents in cathodic electrophoretic emulsions without changing the performance of the emulsion.

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Device and method for eliminating and recycling organic solvent from cathode electrophoresis emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Vacuumize the system continuously to keep the system pressure at 10±1kPa, continuously feed water vapor from the carrier gas inlet at the lower part of the lower tower section, and the water vapor flow rate is 180g / h;

[0040] (2) Start the peristaltic pump, feed cathodic electrophoretic emulsion 1 into the heat exchanger through the cold emulsion inlet at the lower end of the heat exchanger at a feed flow rate of 3500g / h, and flow out from the emulsion outlet of the heat exchanger after countercurrent heat exchange. The emulsion feed port of the middle tower section enters the packed tower for gas-liquid mass transfer;

[0041] (3) Adjust the reflux ratio of the electromagnetic pendulum controller to 3. After the system is preheated, collect the emulsion in the emulsion recovery kettle and the solvent in the solvent recovery kettle.

[0042] After the cathodic electrophoretic emulsion 1 passes through the heat exchanger for heat exchange, the feed temperature rises...

Embodiment 2

[0044] (1) Vacuumize the system continuously to keep the system pressure at 10±1kPa, continuously feed water vapor from the carrier gas inlet at the lower part of the lower tower section, and the water vapor flow rate is 200g / h;

[0045] (2) Start the peristaltic pump, feed cathodic electrophoretic emulsion 1 into the heat exchanger through the cold emulsion inlet at the lower end of the heat exchanger at a feed flow rate of 4000g / h, and flow out from the emulsion outlet of the heat exchanger after countercurrent heat exchange. The emulsion feed port of the middle tower section enters the packed tower for gas-liquid mass transfer;

[0046] (3) Adjust the reflux ratio of the electromagnetic pendulum controller to 3. After the system is preheated, collect the emulsion in the emulsion recovery kettle and the solvent in the solvent recovery kettle.

[0047] After the cathodic electrophoretic emulsion 1 passes through the heat exchanger for heat exchange, the feed temperature rises...

Embodiment 3

[0049] (1) Vacuumize the system continuously to keep the system pressure at 10±1kPa, continuously feed water vapor from the carrier gas inlet at the lower part of the lower tower section, and the water vapor flow rate is 200g / h;

[0050] (2) Start the peristaltic pump, feed cathodic electrophoretic emulsion 1 into the heat exchanger through the cold emulsion inlet at the lower end of the heat exchanger at a feed flow rate of 3500g / h, and flow out from the emulsion outlet of the heat exchanger after countercurrent heat exchange. The emulsion feed port of the middle tower section enters the packed tower for gas-liquid mass transfer;

[0051] (3) Adjust the reflux ratio of the electromagnetic pendulum controller to 3. After the system is preheated, collect the emulsion in the emulsion recovery kettle and the solvent in the solvent recovery kettle.

[0052]After the cathodic electrophoretic emulsion 1 passes through the heat exchanger for heat exchange, the feed temperature rises ...

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

No PUM Login to view more

Abstract

The invention relates to a device and a method for eliminating and recycling organic solvent from cathode electrophoresis emulsion. The device comprises an upper tower section, a middle tower section and a lower tower section, wherein a carrier gas inlet is formed at the lower part of the lower tower section, the lower end of the lower tower section is connected with a heat exchanger of which the bottom is connected with an emulsion recover kettle, the lower end of a heat exchange tube in the heat exchanger is provided with a cold emulsion feeding hole, the upper end of the heat exchange tube is provided with an emulsion discharge hole, the emulsion discharge hole is communicated with the emulsion feeding hole at the lower end of the middle tower section by a charging pump, the upper end of the upper tower section is connected with a tower top, the tower top is externally connected with a condenser, a reflux ratio controller is arranged on the condenser, the bottom of the condenser is connected with a solvent recovery kettle, and the upper end of the condenser is connected with a vacuum pump. The method comprises the following steps: (1) vacuumizing and introducing water vapor; (2) performing reversed current heat exchange to the cathode electrophoresis emulsion, and then performing gas-liquid mass transfer in a packed tower; and (3) adjusting the reflux ratio controller and collecting emulsion and a solvent. According to the device and the method, the removal rate of organic solvent is high, zero emission is realized, the process control is stable, the operation is simple, and the recovery products have excellent performances.

Description

technical field [0001] The present invention relates to a device and method for removing and recovering organic solvents in cathodic electrophoretic emulsions, in particular to a device and method for ensuring the performance of cathodic electrophoretic emulsions, connected to multi-stage packing towers, and adopting a low-pressure steam stripping method A device and method for removing and recovering organic solvent in cathodic electrophoretic emulsion. Background technique [0002] Cathodic electrophoretic coatings are widely used as primers for automobiles, various household appliances, hardware, etc. Parts and other substrates with good conductivity or as a topcoat for non-reflective products. [0003] Most cathodic electrophoretic emulsions are stable oil-in-water emulsions formed by blending a variety of aminated modified epoxy resins or modified acrylic resins with one or more modified blocked isocyanates, neutralized by organic acids, and then emulsified with water....

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
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/38
Inventor 李健刘美凤李海霞魏伟
Owner 湖南湘江关西涂料有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap