A device and method for removing volatile organic compounds in acrylic emulsion

An organic compound and acrylic emulsion technology, which is applied in chemical instruments and methods, separation methods, liquid degassing, etc., can solve problems such as difficulty in device cleaning, human suffocation, performance and stability effects, etc., to reduce production energy consumption and Disposal costs, low VOC content, and continuous operation are safe

Active Publication Date: 2021-06-29
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing method of this method is harsh, and it needs to be distilled under reduced pressure for 3 to 5 hours under the operating conditions of 90°C and absolute pressure of 5KPa. However, long-term exposure of acrylic emulsion to high temperature, high vacuum, and excessive boiling environment will have a great impact on performance and stability.
In addition, the treatment efficiency and yield of this method are low, a large amount of gel and crust will be produced during the treatment process, and it is difficult to clean the device. Industrial production
[0005] Patent CN105169730 discloses a method and device for VOC detachment of acrylic emulsion. The mixed vapor of water vapor and inert gas and acrylic emulsion are used for VOC detachment in the evaporator. The method uses inert gas and water vapor as gas source conditions, and the processing cost High, the treatment process needs to strictly control the gas type ratio, the operation is complicated, and the inert gas is dangerous during the operation process, and the leakage may easily lead to suffocation of the human body
The exhaust gas produced by the device and the separated VOC components are directly discharged into the atmosphere without corresponding treatment, polluting the environment

Method used

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  • A device and method for removing volatile organic compounds in acrylic emulsion
  • A device and method for removing volatile organic compounds in acrylic emulsion
  • A device and method for removing volatile organic compounds in acrylic emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Test according to the test device created by the present invention.

[0093] Put 50kg of acrylic emulsion into the storage tank with agitation, heat it to 45°C through plate exchange, enter the lower part of the gas-liquid mixer at a flow rate of 60kg / h, and at the same time a group of air (air flow rate of 0.3m 3 / h, 0.1MPa) is heated to 55°C by an air heater and enters the bottom of the gas-liquid mixer, and is fully mixed with the emulsion to form a uniform air-emulsion mixture. The mixture enters the top 1 / 3 of the VOC removal tower, and another group of air ( The air velocity is 3.0m 3 / h, 0.1MPa) is heated by an air heater to 40°C and then enters the bottom of the VOC removal tower. The operating pressure of the VOC removal tower is -20KPa, and the volatile organic compound gas after removal of VOC enters the cooling tower from the extraction line of the VOC removal tower Condensation, a small part of non-condensed volatile organic compounds enters the tail gas a...

Embodiment 2

[0108] Example 2 was performed on a larger scale than Example 1. Pour 8000kg of acrylic emulsion into the storage tank with agitation, heat it to 50°C through plate exchange, enter the lower part of the gas-liquid mixer at a flow rate of 80kg / min, and at the same time, a group of air (air flow rate of 20m3 / h, 0.1MPa) passes through the air heater After heating to 65°C, it enters the bottom of the gas-liquid mixer and fully mixes with the emulsion to form a uniform air-emulsion mixture. The mixture enters the top 1 / 3 of the VOC tower, and another set of air (air flow rate is 100m3 / h, 0.1MPa) After being heated by an air heater to 50°C, it enters the bottom of the VOC removal tower, and the pure water injector at the top of the VOC removal tower sprays pure water for 5 minutes after an interval of 5 minutes (the flow rate of pure water is 10kg / min) to supplement solid content and clean the tower wall , the nozzle on the top of the VOC removal tower is sprayed obliquely downward ...

Embodiment 3

[0112] Example 3 was performed on a larger scale than Example 1. Pour 6000kg of acrylic emulsion into the storage tank with agitation, heat it to 45°C through plate exchange, enter the lower part of the gas-liquid mixer at a flow rate of 100kg / min, and at the same time a group of air (air flow rate of 15m 3 / h, 0.1MPa) is heated to 55°C by an air heater and enters the bottom of the gas-liquid mixer, and is fully mixed with the emulsion to form a uniform air-emulsion mixture. The mixture enters the top 1 / 3 of the VOC removal tower, and another group of air ( The air velocity is 75m 3 / h, 0.1MPa) is heated by an air heater to 35°C and then enters the bottom of the VOC removal tower. The pure water injector at the top of the VOC removal tower sprays pure water for 1 minute after an interval of 1 minute (the flow rate of pure water is 10kg / min) to supplement Solid containment and cleaning of the tower wall, the nozzle at the top of the VOC removal tower is sprayed obliquely downw...

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Abstract

The invention relates to a device and method for removing volatile organic compounds in acrylic emulsion. The device includes a storage tank with stirring, a plate heat exchanger, a gas-liquid mixer, a first air heater, a second air heater, a VOC tower, cooling tower, vacuum system and tail gas absorption tower, the outlet of the storage tank is connected to the inlet of the plate heat exchanger, the outlet of the plate heat exchanger and the air heater are respectively connected to the bottom inlet of the gas-liquid mixer, and the gas The outlet of the liquid mixer is connected to the upper inlet of the VOC removal tower, the air heater is connected to the bottom inlet of the VOC removal tower, the gas outlet at the top of the VOC removal tower is connected to the inlet of the cooling tower, and the bottom outlet of the VOC removal tower is an odor-free emulsion Products are exported. The device and method of the present invention can efficiently remove volatile organic compounds in the acrylic emulsion, realize zero pollution and zero emission by using compressed air as the air source condition, the continuous operation is safe and efficient, and the production energy consumption and treatment cost are greatly reduced.

Description

technical field [0001] The invention relates to a device and method for removing volatile organic compounds in acrylic emulsion. The treatment method is a physical separation process, which can effectively remove the taste of the acrylic emulsion while removing the volatile organic compounds in the acrylic emulsion, and can be used to produce the clean-smell acrylic emulsion. It belongs to the field of petrochemical industry. Background technique [0002] With people's concern about environmental protection, water-based acrylic emulsion products have developed rapidly due to their excellent performance and low production costs, and have become the resin with the largest output in the field of water-based coatings. [0003] Volatile organic compounds (VOC for short) refer to all organic compounds with a standard boiling point below 250°C, including residual monomers, impurities, solvents, and reaction by-products, etc. VOC will inevitably be generated during the polymerizati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D19/00B01D53/00B01D53/18
CPCY02A50/20
Inventor 马磊乔义涛贾元峰杨建强李树森韩晶孙家宽
Owner WANHUA CHEM GRP CO LTD
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