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Trusted Supplier of Coalescing Separator Filters

In petroleum refining or hydrocarbon processing process, due to the raw material itself with water or process level process, such as vapor extraction, alkaline washing amine treatment and other processes into the process of water and so on, resulting in the media or products inevitably mixed with water. The existence of water will adversely affect the process effect, process equipment and final product quality:

◆Toxicity and failure of catalyst
◆ Harming the subsequent process and affecting the quality of the subsequent products.
◆Hazardous to process equipment, such as turbidity of aviation coal, steam, coal, diesel and other refined oil products

Therefore, in the refining enterprises need to invest a lot of equipment, materials and labor to solve the dehydration problem of hydrocarbon media. The traditional dehydration methods are mainly gravity settling method, adsorption method and fiber accumulation and agglomeration method.

Trusted Supplier of Coalescing Separator Filters 1

Gravity sedimentation method of the specific gravity of water itself, is currently the first and common use of the dehydration method. But this method is only for the diameter of water beads greater than 50um, and have enough residence time to be effective, while the separation tank requires a larger volume. For the diameter of less than 50um, especially in the diameter of 1-10um or smaller water droplets, due to the dispersion system is extremely stable, with gravity settling method placed for a number of days will not appear obvious separation. Therefore, the separation efficiency of gravity settling method is very low, for some separation efficiency requirements of strict occasions, gravity settling method can not meet the requirements.

Adsorption method is the use of filling tower or drying tower in the salt, molecular sieve and other desiccant to dehydration. Although the adsorption method has the advantage of removing the dissolved water in the medium, but this method also has quite a lot of shortcomings: the initial investment cost is high; the amount of desiccant is large, especially the higher water content occasions, and the regeneration of the desiccant and the replacement of the cost is high; adsorption effect with the temperature of the medium and the flow rate of changes in the impact of the big; in the use of the process will occur, “bridge”, “ditch”, ‘ditch flow’, ‘clogging’, ‘desiccant loss’ and other issues, is not suitable for water content; higher occasions.

Traditional fiber stacking agglomeration law using glass fiber agglomeration, free water out of the medium. However, this method of glass fiber without special treatment, dehydration capacity and dehydration efficiency is low; fiber stacking, unreasonable structure, the fiber is easy to collapse, susceptible to polar surfactant contained in the media contamination, polymerization effect is gradually lost. Thus affecting the dehydration effect. At the same time, this method is followed by no separation process, some of the aggregation out but too late to settle the small droplets will still enter the downstream with the media, thus affecting the quality of the downstream media.

With the development of the petrochemical industry, the hydrocarbon media dehydration technology, whether in the effectiveness of the technology, applicability, economy and other aspects of the requirements are increasingly high. The above traditional hydrocarbon media dehydration methods in the processing capacity, the applicability of working conditions, dehydration capacity, dehydration efficiency and operating costs of the economy can not meet the requirements of the petrochemical industry development.

Trusted Supplier of Coalescing Separator Filters 3

LEFILTER coalescer or coalescing filter is an innovative separation product, which realizes phase separation through agglomeration, i.e., the merging of several small free droplets into one large droplet. Typical applications for coalescers are:

Removal of water and liquid hydrocarbons from natural gas or other gases
Removal of water from diesel or other fuels
Removal of liquid hydrocarbons (oil) from water
LEFILTER’s coalescer technology utilizes multiple layers of specially constructed agglomerated filtration elements to achieve high separation efficiencies.LEFILTER’s high efficiency elements are designed to separate even lubricating oil aerosols in the sub-micron range, which become entrained downstream of the gas compressor application.

Trusted Supplier of Coalescing Separator Filters 2

LEFILTER offers coalescers in both vertical and horizontal configurations, depending on various factors such as liquid contaminant loading, interfacial tension between the liquid contaminant and the working fluid, the presence of surfactants in the working fluid, and the physical properties of the working fluid . Coalescer design is not just a factor in efficient coalescing elements. When designing the coalescer, LEFILTER pays equal attention to vessel size and component size. An undersized coalescer vessel will allow re-entrainment of detached droplets, while an oversized coalescer will add additional cost.

Main performance indicators
1. Starting pressure difference: <0.03MPa
2. Dehydration ability: water content up to 10%
3. Dirt holding capacity: 4g/(L/min rated flow)
4. Maximum allowable working pressure difference: 0.1MPa
5. Filter element structural strength:>0.7MPa

Applicable media: various chlorocarbon compounds; aviation fuel, gasoline, kerosene, diesel; liquefied petroleum gas, petroleum coke, naphtha; benzene, toluene, xylene, cumene, polypropylene, cyclohexane, isopropane Propanol, cyclohexanol, cyclohexanone, etc.

working principle
There are two filter elements inside the coalescing separator that are specially designed for dehydration of hydrocarbon media, the coalescing filter element and the separation filter element. When the medium flows through the interior, it must go through four processes of filtration, coalescence, sedimentation, and separation, thereby achieving dehydration. Moisture, alkali and water-soluble organic acid salts in the medium.

Trusted Supplier of Coalescing Separator Filters 4

The medium first flows through the coalescing filter element from the inside to the outside, which has a special dual function of filtering and coalescing water.

The high-precision filter layer in the innermost layer of the coalescing filter element effectively intercepts particulate impurities in the medium, especially iron oxide, iron sulfide and other impurities that are obviously detrimental to stable emulsification, which is beneficial to subsequent demulsification and coalescence functions.

The filtered media then enters the demulsification and coalescing layer of the coalescing filter element. The special material in the demulsification and coalescence layer demulsifies the medium, condenses the tiny, free water in the medium, and condenses into water droplets on its surface. Large water droplets rely on their own gravity to settle into the water collection tank, while smaller water droplets will flow to the separation filter element along with the medium.

The separation filter element is made of patented technical materials and has good hydrophobic properties. When the medium flows through the separation filter element from the outside to the inside, only the medium is allowed to pass through. The small water droplets are completely and effectively intercepted outside the filter element and coalesce into large particles. The water droplets settle, further separating the water.

Process flow
1. In order to extend the service life of the coalescing filter element in the coalescing separator and improve the dehydration efficiency, it is recommended to install a pre-filter before the coalescing separator. The purpose of the pre-filter is mainly to filter out larger solid particle impurities and harmful impurities such as iron oxide and iron sulfide in the medium.
2. Each device is designed with a bypass to ensure continuous operation of the system when replacing the filter element of the device.
3. Each device is designed with a sewage outlet at the bottom, which is conducive to the discharge of sewage and the recycling of separated media.

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