Application of Bidun PTFE membrane contact reactor in removal of dimethylamine exhaust gas

(Dimethylamine waste gas treatment case )

  1. Project Introduction

A certain enterprise uses a large number of organic solvents in the production process. The effective recycling and reuse of organic solvents is the key to the stable production of enterprises. The organic solvent recycling process is accompanied by environmental protection management problems such as wastewater and waste gas. Among them, dimethylamine waste gas is one of the treatment needs, and enterprises urgently need a treatment process with low energy consumption and high quality transfer efficiency.

(I) There are problems

( 1 ) The sulfuric acid spray treatment process has poor effect;

( 2 ) The applied PP membrane module cannot tolerate organic swelling ;

(II) Solution

After analysis and research, the treatment process of BDUN PFTE membrane contact reactor was adopted. The PTFE hollow fiber membrane in the Bidun PTFE membrane contact reactor is made of polytetrafluoroethylene as a material, and has the advantages of high strength, corrosion resistance, pollution resistance, oxidation resistance, high COD resistance and high surface smoothness. The company has independent intellectual property rights of membrane making technology, PTFE membrane has a uniform pore size and large flux, and the films produced with different parameter characteristics can be used in a variety of industry fields.

(III) This technology has the following advantages:

  1. The micro combination ofblow-off tower+ chemical absorption tower or stripping tower + neutralizing reactor can be achieved at the same time in the membrane, and the advantages of high specific surface area, high mass transfer driving force, small area, and saving investment ;
  2. Operation near normal pressure, electrical energy is only used to drive the material liquid through the membrane module, saving>80% of electricity ;
  3. After good pretreatment of exhaust gas,its operating performance is stable and its service life is long ;
  4. Modular design, linear amplification, and high waste gas treatment efficiency.
  5. There aremanytypes of by-products, high concentration and purity, and can be reused, which can effectively reduce operating costs;
  6. The entire process is closed toeffectively avoid secondary pollution .
  7. High operating flexibility, the most economical process volume is small, and absorption towers, etc. must be used on a large scale, and the capacity expansion in the later stage is convenient;
  8. The performance ofPTFEhollow fiber membrane is extremely stable and can be cleaned and regenerated .

 

 

  1. Project Overview

( 1 ) The gas volume of dimethylamine exhaust gas system: 300m 3 /h .

( 2 ) Dimethylamine waste gas treatment system treatment requirements

project Dimethylamine
index ≤20 mg/L (no obvious amine smell on site)

( 3 ) Process flow

Waste gas → Fan → Secondary filtration → PTFE membrane degassing device → Waste gas emission

After the exhaust gas is heat-exchanged, the temperature is heated to 30~40℃ (completed within the owner’s boundary area), the incoming gas is filtered by security guard (a total of two levels, with accuracy of 10μm and 1μm respectively ), pressurized to 0.4bar , and then sent to the PTFE membrane degassing device to remove dimethylamine.

(4) Actual operation effect

 

  1. Live pictures