The BHS Continuous-Indexing Vacuum Belt Filter (CI-VBF) with. 12 m2 of filter area replaced a 440 m2 filter press. The CI-VBF provided improved washing
8 pages
91 KB – 8 Pages
PAGE – 1 ============
Solid-Liquid SeparationCake Washing & Drying Technologies 9123-115 Monroe RoadCharlotte, NC 28270 Tel704.845.1190 Fax704.845.1902 e-mailinfo@bhs-filtration.com internetwww.bhs-filtration.com Technical Report Report Number 030304-101654 By Barry A. Perlmutter, President & Managing Director Evaluation of a Continuous-Indexing Vacuum Belt Filter As a Replacement for Filter Presses For the Manufacture of a High-Value Specialty Chemical Product The BHS Continuous-Indexing Vacuum Belt Filter (CI-VBF) with 12 m2of filter area replaced a 440 m 2filter press. The CI-VBF provided improved washing efficency for a higher quality product, and lower operating and lower maintenance costs with a fully automated operation.
PAGE – 2 ============
Introduction ˆ ‘ Current Operation & Process Problems ˜)). / 1 1# 1( 1 13 14 ˝ % ( ˜'”(! ˘ ˚ ‘”( ( 2 www.bhs-filtration.com Evaluation of a Continuous-Indexing Vacuum Belt Filter As a Replacement for Filter Presses For the Manufacture of a High-Value Specialty Chemical Product The BHS Continuous-Indexing Vacuum Belt Filter (CI-VBF) with 12 m 2of filter area replaced a 440 m 2filter press. The CI-VBF provided improved washing efficency for a higher quality product, and lower operating and lower maintenance costs with a fully automated operation. By Barry A. Perlmutter, President & Managing Director
PAGE – 3 ============
Table 1: Comparisons of Vacuum Belt Filter (VBF) Technologies ComponentContinuous-Moving TrayRubber BeltComments IndexingRubber belt andNot requiredNot requiredRequired; Increased maintenance sealing beltsmovement is by an and spare part costs; external motorincreased water usage (30%) for belt sealing and lubricationMoving TraysNot required, trays RequiredNot RequiredRails and rollers to are fixed in placemaintain and lubricate, flexible hoses for the filtrate outlets are difficult to reach and may require an enclosed space entry. Slurry Feeding Gentle; eliminates Inclined feed plate Inclined feed plateCI-VBF employs a splashing; oscillating controlled feed for feed zone is possiblecomplete tray coverage and even cake buildup. Cake WashingEfficient displacementContinuousContinuousCI-VBF employs spray wash as belt is balls, nozzles or overflow stopped; residencefor washing; cake time can bewashing is controlled and maximizedeffiency maximizedMultiple Stages of YesYesYesPossible with all designs. Cake Washing Separation of mother Yes; trays and filtrateNo; filtrates areNo; filtrates areCI-VBF allows for liquors and wash outlets are fixed somixed making mixed makingrecovery of the mother filtrateseach filtrate can berecovery difficultrecovery difficultliquor and filtrates; recovered separatelyrecirculation and reuse is easily accomplished.Mechanical Cake Yes, belt is stoppedYes, design requires aNoCI-VBF allows for Compressionsqueezing belt againstmechanical squeezing the discharge roller of the cake which also rubs the cakeDrying by VacuumYesYesYesIn some cases, vacuum levels may be higher in CI-VBFDrying by hot gas Yes; belt is stopped Yes, heats up airYes, heats up airCI-VBF provides for blowing or steamingwhich allows for space but not thespace but not themaximum drying steam or gas to be cake directly; cake directly; efficiency in open or directly injected into requires a hoodrequires a hoodpressure-tight designs the cake; can be used with open designs Filter Belt CleaningYesYesYesCI-VBF units can employ difference methods of belt cleaning including from above and below the belt, high-pressure spray nozzles; wash water is only used when the belt is moving; the wash water is stopped when the belt is stopped which reduces water / solvent usage.VBF CleaningEasy to cleanDifficultDifficultCI-VBF units eliminate extra hardware and belt components for easy cleaning; automated clean-in-place designs without operator intervention are possible. www.bhs-filtration.com 3
PAGE – 5 ============
;2( ˙ *.>$ ‘ % Scale-Up from the PLF Data ˚/˘ / ˆ Figure 3. BHS Pocket-Leaf Filter (PLF)www.bhs-filtration.com 5Table 2: Scale-up Procedure Filter Performance (liters/m2/minute) =Sample Volume (PLF Area* Filtration Time) Total Area Required to Meet the Production Rate = A tAt= Sum of the Filtration area (A f) + Washing Area (A w) + Drying Area (Ad)Af= Production Rate/ Filter Performance Aw= Total Washing Time / (Filtration Time* A f) Ad= Total Drying Time / (Filtration Time* A f) Figure 2. CI-VBF Operational FeaturesThink of a Buchner Funnel and Vacuum Flask Step 1: Slurry Feed and Cake Building Step 2: Cake Washing Step 3: Vacuum Drying Now, think of several flasks. Now, combine these to a continuous process. The result is the BHS Continuous Indexing Vacuum Belt Filter .Step 1Step 1Step 2Step 2Step 3
PAGE – 6 ============
Conclusion and PathForward Steps from the Preliminary PLF Test Data & Scale-Up ,˘ /˘ -˘ )˘ Pilot-Scale Tests at the CustomerÕs Plant Site / / 9 : / / / Pilot-Scale Testing Scale-Up Results & Discussion ˚ /ˆ ,˘ / )˘ / @˘ *˘ =˘ <˘ Figure 4. BHS 0.3 m2pilot-scale CI-VBFFigure 5. BHS 0.8 m2pilot-scale CI-VBF (Vacuum & filtrate package is on a separate skid, not shown) 6www.bhs-filtration.com
PAGE - 8 ============
Specializing in Thin-Cake Filtration,Cake Washing & Drying Technologies Test in the BHS Laboratory or at Your Plant for the Optimum Process Technology BHS Candle Filter & Inverting Filter¥Pressure filtration, clarification and heel filtration ¥Specialized candles with perforated metallic or synthetic cores ¥Filter media to less than 1 micron ¥Cake washing produces a uniform cake for drying ¥Cake discharge via gas blowback for the candle filter ¥Possible pre-coating of the media with activated carbon or diatomaceous earth ¥Cake discharge by inverting filter cloth for heel-free discharge and final moisture content to 1% for the inverting filterBHS Pressure Plate Filter¥Horizontally designed for stable cakes ¥Possible pre-coating of the media with activated carbon or diatomaceous earth ¥Vibrating plates, along with gas-assist pulsing, provide for automatic discharge ¥Effective solids discharge without spinning-plates ¥No rotating or mechanical seals BHS Belt Filter¥Continuous filtration, washing and drying ¥Thin-cakes between 0.25-4 inches ¥Multiple washing zones for forward or counter-current washing to 99.99% purity ¥Drying to 0.1% moisture with heated trays and mechanical compression ¥Materials include stainless steel, Hastelloy and synthetic materials ¥Gas-tight and pressurized housings BHS Autopress¥The Autopress is installed in potent compound and active pharmaceutical ingredient (APIÕs) facilities as well as for specialty chemical applications ¥Thin-cake, typically 0.25-1.0 inches, production ¥Filter plates are contained in a pressurized filter housing for complete containment ¥Batch pressure filtration and forward or reverse flow washing ¥Vacuum or hot-gas drying or pre-drying without agitation or tumbling ¥Mechanical compression to 600 psig to eliminate cake cracking ¥Fully automatic, heel-free and contained product discharge ¥CIP systems with documented performance based upon Riboflavin tests BHS Rotary Pressure Filter¥Continuous thin-cake (0.25-6 inches) production ¥Filtration is conducted via pressure of up to 90 psig ¥Positive displacement washing or counter-current washing ¥Multiple washing steps as well as solvent exchanges, steaming and extraction ¥Cake drying by blowing hot or ambient-temperature gas ¥Atmospheric discharge from pressure operations for direct discharge to downstream equipmentBHS-Filtration Inc.9123-115 Monroe Road, Charlotte, NC 28270 ¥ Tel 704.845.1190 ¥ Fax 704.845.1902 e-mail: info@bhs-filtration.com ¥ internet: www.bhs-filtration.com BHS-Filtration Inc. is a subsidiary ofBHS-SonthofenHans-Bıckler-Stra§e 7 ¥ D-87527 Sonthofen, Germany ¥ Tel 49.8321.802.200 ¥ Fax 49.8321.802.320 ¥ www.bhs-sonthofen.de
91 KB – 8 Pages