Filtration and Drying Equipment

38 %
63 %
Information about Filtration and Drying Equipment
Technology

Published on March 11, 2014

Author: DDPSInc

Source: slideshare.net

Description

This presentation reviews the 7 steps in the filtration and drying process of nutsche filtration.

Filtration and Drying Equipment

Typical Scope  DDPS Filter/Dryers: – efficiently perform filtration, washing, reslurry, and drying – are designed for batch operation – handle multipurpose pharmaceutical and fine chemical applications – are available in pilot, semi-works, and production units • Sizes from 0.002m² to 16.0m²

Typical Scope  DDPS Filter/Dryers: – efficiently perform filtration, washing, reslurry, and drying – handle multipurpose pharmaceutical and fine chemical applications – are available in pilot, semi-works, and production units • Sizes from 0.002 m² to 16.0 m² Special designs are available, including: • cGMP • CIP • Aseptic • Sterile • Lethal service • Customization for other special requirements

Filtration and Drying Process Steps 1. Filling/Charging 2. Filtering 3. Displacement Washing 4. Reslurry Washing 5. Smoothing 6. Drying/Cooling 7. Discharging

Filling/Charging  The first step involves charging the product to be filtered, typically an aqueous or solvent based solid/liquid slurry, into filter from a primary location (reactor/vessel)  The filter is usually sized for solids volume. ― Maximum solids = agitator stroke, typically 12 - 20 inches. ― Also limited by filtration rate. . ..

Filling/Charging  The first step involves charging the product to be filtered, typically an aqueous or solvent based solid/liquid slurry, into filter from a primary location (reactor/vessel)  The filter is usually sized for solids volume. ― Maximum solids = agitator stroke, typically 12 - 20 inches. ― Also limited by filtration rate. . .. Filter vessel volume does not have to equal reactor volume

Filtration Rate  What controls filtration rate? ― Particle size ― Particle shape ― Cake porosity ― Compressibility  Typically you cannot measure these factors directly, so testing must be done to measure their effect: ― Pressure drop ― Filtration rate ― Cake depth  Tests should be conducted at anticipated cake depth, and more.  Higher temperature usually = faster filtration.

Filtration Constraints  Minimum cake depth of 3 inches ―Note: This is pertaining to “deep bed filtration”, in which the filtration mechanism is particle bridging (not absolute filtration).  Minimum Filtration Rate ―Typically 4 liter/min-M² (0.1 gpm/ft²) ―Minimum cake buildup rate of 1-inch per hour

Filtering  The second step involves the use of pressure or vacuum to force liquid through the solid bed and filter media. The process is stopped when solids are visible, or can be continued until all the liquid is pushed out. . .. . ..

Washing of the Filter Cake: Displacement  Here, fresh wash liquid is sprayed on top of the solid cake. The liquid is forced through with pressure or vacuum.  The purpose of this step is to: ― remove the previous liquid and its impurities. ― keep cake intact (do not disturb). ― try to close cracks (if cake has any). ― replace previous liquid with fresh liquid. . ..

Washing of the Filter Cake: Reslurry  As an additional washing option, fresh wash liquid is added and mixed with the solids. The agitator is stopped and raised before filtering.  The reslurry process is used if: ―extracting or dissolving impurities ―long contact time is needed ―cake is severely cracked ―displacement wash does not work . .. . ..

Washing of the Filter Cake: Reslurry  As an additional washing option, fresh wash liquid is added and mixed with the solids. The agitator is stopped and raised before filtering.  The reslurry process is used if: ―extracting or dissolving impurities ―long contact time is needed ―cake is severely cracked ―displacement wash does not work . .. . ..Reslurry is unique to agitated nutsche filters.

Smoothing  This next step may be used after any filtration or wash, especially after the final wash, when gas is blowing through.  The agitator will close cracks and compress the cake to reduce residual moisture level. . ..

Smoothing  This next step may be used after any filtration or wash, especially after the final wash, when gas is blowing through.  The agitator will close cracks and compress the cake to reduce residual moisture level. . .. The smoothing process may not be necessary or useful in some cases.

Vacuum Drying  Vacuum drying requires: ―Heated vessel surfaces (wall, base, agitator) ―Vacuum source ―Agitation ―Dust filter . .. . ..

Vacuum Drying  Vacuum drying requires: ―Heated vessel surfaces (wall, base, agitator) ―Vacuum source ―Agitation ―Dust filter . .. . .. Vacuum drying is the most common drying method in filter/dryers, and the only method for dedicated dryers such as pan and spherical dryers.

Convection Drying • During the convection drying phase hot, pressurized gas (usually nitrogen) can be blown down through solids and out of filtrate lines; this will eventually dry the solids. • The vessel should be heated. • Solids may or may not be agitated. • Hot gas may or may not be recirculated. . ..

Convection Drying • During the convection drying phase hot, pressurized gas (usually nitrogen) can be blown down through solids and out of filtrate lines; this will eventually dry the solids. • The vessel should be heated. • Solids may or may not be agitated. • Hot gas may or may not be recirculated. . .. This method of drying is applicable to filter/dryers only, because of their porous filter plate.

Stages of the Drying Process - Stage One: Removal of free moisture from the wet product. - Stage Two: Removal of moisture from pores of the wet product. - Stage Three: Removal of chemically bound moisture. 0 10 20 30 40 50 60 70 80 90 100 1 2 3 4 5 6 7 8 9 10 11 12 Time %Moisture 0 10 20 30 40 50 60 70 80 90 100 DryingRate Stage One: Constant Rate Stage Three: Diffusion Rate Stage Two: Falling Rate Critical Point Rate of Drying Percent Moisture

Discharging  Discharge is accomplished through the valve/port located on the vessel sidewall.  The agitator is used to move product to the side discharge valve ―Agitator is slowly lowered until product is removed. . ..

Discharging  Discharge is accomplished through the valve/port located on the vessel sidewall.  The agitator is used to move product to the side discharge valve ―Agitator is slowly lowered until product is removed. . ..The vessel and product may need to be cooled to an ambient temperature prior to discharge.

Process Support Capabilities  Fully supported by in-house process engineers.  Filtration testing with 0.002m² “Pocket” Filter ―Ensures the acceptability of the filter for the specific customer processes.  Allows for process optimization, while limiting product losses and production down time.

Filter/Dryer Advantages  Totally enclosed and pressure tight (rated to 50 psig/FV at a minimum) ― No operator or environmental contact with the product ― Ideal for high purity, toxic, or flammable materials  No live load associated with the filter ― Low RPM agitator (8 – 20 rpm typical) ― Lower installation cost  Low maintenance and operational costs ― No high speed components ― Low motor HP by comparison to other types of equipment (e.g. Centrifuge) ― Agitator only used during drying, smoothing, reslurry washing, and discharge (whereas a centrifuge motor is always in operation).

Filter/Dryer Advantages (cont’d)  Efficient cake washing ― Extended residence time during displacement washing ― Capable of reslurry washing ― Reduced wash fluid  Possible increased capacity ― Units typically sized to handle entire batch solids load  Flexible discharge ― Can discharge dry solids, wet solids, slurries, or liquid  Drying capability ― Less than 0.1% final product moisture ― Vacuum or blow through drying ― Completely dry material out of the filter

Example – Production Unit (1.0m2 units)

Example – Production Unit (1.0m2 units)

 Additional Resources – Filtration Webpage – Filtration Questionnaire – Contact Us – Call 908.317.2585 to speak with a DDPS representative Thank you

Add a comment

Related presentations

Related pages

Filtration and Drying Equipments, Filter Dryers - Charles ...

Charles Thompson’s award-winning filtration & drying division undertakes R&D and thorough testing of new equipment, ensuring customer needs are realised ...
Read more

Agitated Nutsche Filters - Filtration & Drying Equipment

GMM Pfaudler's Filtration and Drying equipment are engineered and built as per ASME code Section VIII Div. 1. European design codes like AD Merkblatter ...
Read more

ALSI - Compressed Air Drying Equipment - Air and Liquid ...

With 50 years of experience designing and implementing filtration and drying equipment, ALSI offers integrated solutions with industry-leading service and ...
Read more

Filtration

FILTRATION cvba : office and warehouse Antoon Catriestraat 201 9031 Gent-Belgium. Tel.: +32 (0)9 281 11 89 Fax: +32 (0)9 281 11 87 E-mail: info@filtration.be
Read more

Filtration / drying and process technology case studies ...

Case Studies Because of their vast knowledge in the area of filtration / drying and process technology, Rosenmund ® is able to provide core equipment and ...
Read more

Welcome - Alconbury Weston Ltd.

Alconbury Weston Ltd are at the forefront of the design, manufacture & supply of Continuous Processing Equipment ... Filtration & Drying Equipment Specialists.
Read more

Filtration Drying, Filtration Drying Suppliers and ...

Filtration Drying, Wholesale Various High Quality Filtration Drying Products from Global Filtration Drying Suppliers and Filtration Drying Factory,Importer ...
Read more

Filter media - Filtration + Separation

German automatic filtration manufacturer, ... manufacturer of compressed air filtration and drying equipment, ... Filtration+Separation, ...
Read more

Charles Thompson - Process Plant Equipment Manufacturer ...

Charles Thompson Ltd designs and manufactures process plant equipment and is a sour service environment equipment and cladding solution application specialist.
Read more