Demister Pad: Efficient Entrainment Removal, Excellent Separation Performance

Demister pad, installed at the top of the packed columns, consists of several piece assembled gas-liquid filter mesh pads and support parts, and is an indispensable key component in industrial processes. It is designed to effectively separate and remove entrainment and suspended particles from gases or liquids, improve separation and mass transfer efficiency and enhance operational conditions. Additionally, it can also optimize process indicators, reduce equipment corrosion, protect the environment, and minimize air pollution.

Choosing our demister pads is a guarantee of choosing excellent performance and reliability. We offer a variety of demister pads in diverse models and specifications to meet different project and application requirements.

Split type round wire mesh demister pad display
Table 1: Demister Pad Material
Material Products Separated Material Products Separated
SS304 For nitric acid, water steam Hostaflon PTFE For Highly corrosive conditions
SS304L For petroleum Fractions Inconel 825 For dilute acid media & alkaline solution
SS316 For fatty acids, reduced crude Inconel 625 For phosphoric and fatty acid
SS316L Reduced crude containing acid & other corrosive Polypropylene For hydrilic acid, corrosive service at moderate temperature
Copper Alcohol, Aldehyde, Amines PVDF Corrosive Service for Temperature 140 °C
Monel For caustic soda & other alkali, dilute acid PTFE/FEP/PFA/ETFE/ECTFE For highly corrosive and high temperature
Nickel For caustic soda, food product Hostaflon Sulphuric acid plant, temperature up to 150 °C
Alloy 20 Nitric acid, alkaline PH Glass Wool For very fine mists
Teflon FEP For Highly corrosive conditions
Table 2: Demister Pad Specifications
Item Density (kg/m3) Free Volume (%) Surface Area (m2/m3) Application
BDP-80 80 99 158 Moderate fouling, minimum press drop, dirty service
BDP-144 144 98.2 280 Heavy duty, e.g. oil & gas separators
BDP-128 128 98.4 460 Light fouling, high velocity, dirty service
Notes: Except for BDP-80, other models data is only suitable for metal materials.
Mesh Pad Types

According to the weave types, demister pads are divided into standard type (SP), efficient type (DP) and high penetration type (HR/HP).

Relative loose knitted mesh opening display

SP type demister pad

Dense flat round wire knitted mesh opening display

DP type demister pad

Relative dense round wire knitted mesh opening display

HR/HP type demister pad

  • By material: metal demister pads, non-metal demister pad
  • By shape: round demister pad, rectangular demister pad, irregular demister pad, ring demister pad, corrugated demister pad, drawer type demister pad.
  • By structure: integrated demister pad, split type demister pad.
  • By installation: upload type demister pad, download type demister pad.
Round demister pad is divided into 4 blocks.

Split demister pad

An integrated round wire mesh demister pad

Integrated round demister pad

Rectangular demister pad is divided into several blocks.

Split rectangular demister pad

Split irregular demister pad

Irregular demister pad

A ring shape wire mesh demister pad

Ring demister pad

Split corrugated wire mesh demister pad

Corrugated demister pad

Split plastic demister pad

Drawer type demister pad (plastic)

  • Large specific surface area and high defoaming efficiency.
  • Reduce equipment corrosion and extend equipment life.
  • Small resistance, light weight, simple structure, easy installation and maintenance.
  • Control exhaust emissions, reduce air pollution and protect the environment.
Working Principle

When the gas with entrainment rises and passes through the wire mesh demister pad, under the inertial effect, the entrainment adheres to the filament surface of the knitted mesh. As the entrainment diffuses and gravity causes it to settle, larger liquid droplets are formed. Eventually, when the gravity produced by the droplets exceeds the combined force of gas uplift and liquid surface tension, the droplets separate from the filament and fall off. For droplets with a diameter of 3–5 μm, the overall entrainment removal efficiency is 98% above.

Demister pad installation, working principle and structure

It is widely used in packed columns, absorption columns and other industrial equipment to effectively remove entrainment in gases or liquids and improve the separation and mass transfer efficiency.