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Solvent Module
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Leviton 24W04 15 Amp, 125 Volt, Plug, Locking Blade, Industrial Grade, Non-Grounding, Wetguard, Yellow
List Price: $24.96
Sale Price: $18.59
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15 Amp, 125 Volt, NEMA L1-15P, 2P, 2W, Plug, Locking Blade, Industrial Grade, Non-Grounding, Wetguard - Yellow
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Leviton 14W33 20 Amp, 125 Volt, Straight Blade, Plug, Industrial Grade, Grounding, Wetguard, Yellow
List Price: $20.92
Sale Price: $20.92
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20 Amp, 125 Volt, NEMA 5-20P, 2P, 3W, Plug, Straight Blade, Industrial Grade, Grounding, Wetguard - Yellow, UPC: 07847784831
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Leviton 26W48 20 Amp, 250 Volt, Locking Plug, Industrial Grade, Grounding, Wetguard, Yellow
List Price: $35.55
Sale Price: $24.95
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20 Amp, 250 Volt, NEMA L6-20P, 2P, 3W, Locking Plug,Industrial Grade, Grounding, Wetguard - Yellow, UPC: 07847796799
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Leviton 14W48 20 Amp, 250 Volt, Straight Blade, Plug, Industrial Grade, Grounding, Wetguard, Yellow
List Price: $21.81
Sale Price: $12.95
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20 Amp, 250 Volt, NEMA 6-20P, 2P, 3W, Plug, Straight Blade, Industrial Grade, Grounding, Wetguard - Yellow, UPC: 07847784832
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Fluke 919811 PV350 Pressure and Vacuum Module
List Price: $419.17
Sale Price: Too low to display
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Compatible with all Fluke and most popular DMMs Digital pressure and vacuum measurements in a single module Transducer sealed in 316 stainless steel compatible with variety of liquids and gases Measures vacuum to 76 cm Hg Displays results in English (psig of Hg) or metric (kPa or cm Hg) unitsThis highly accurate pressure transducer measures from 0.5 to 350 psig (3.447 to 2413 kPa) and 0 to 29.9" Hg (0 to 76cm Hg). It's compatible with any automotive fluid, such as oil or coolant, or any gas, such as R-12, R-134A. One-year warranty.
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![Module arrangement for solvent dehydration with silica membranes [An article from: Desalination]](http://ecx.images-amazon.com/images/I/51W2ZTSE75L._SL75_.jpg) |
Module arrangement for solvent dehydration with silica membranes [An article from: Desalination]
List Price: $8.95
Sale Price: $8.95
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This digital document is a journal article from Desalination, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.Description: This simulation study investigated the influence of operating parameters and module and system design on performance and cost of pervaporation modules. It was based on isopropanol dewatering measurements with silica membranes and different types of methods to calculate heat and mass transfer resistance. It was shown that conventional modules need up to 50% more membrane surface than a new isothermal module design (Pervap SMS(R) by Sulzer Chemtech). The performance was evaluated by comparing depletion, pressure drop and polarisation effects lowering the module efficiency. Assuming a best-guess cost structure for dewatering with inorganic membranes, it was concluded that the optimum lies in the range of high cross-flow velocities/Reynolds numbers. Pressure drop values around 10 bar may still be economical, but module arrangement plays a smaller role due to a near constant mass flow on the feed side.
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![Treatment of phenol-containing aqueous solutions by membrane-based solvent extraction in coupled ultrafiltration modules [An article from: Chemical Engineering Journal]](http://ecx.images-amazon.com/images/I/51CVCBGHB5L._SL75_.jpg) |
Treatment of phenol-containing aqueous solutions by membrane-based solvent extraction in coupled ultrafiltration modules [An article from: Chemical Engineering Journal]
List Price: $8.95
Sale Price: $8.95
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This digital document is a journal article from Chemical Engineering Journal, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.Description: Extractive treatment of phenol-containing aqueous streams by two coupled hollow fiber modules (for simultaneous extraction and stripping) is experimentally and theoretically studied. The effects of hydrodynamic conditions (linear velocities of all three liquids) and concentrations (initial phenol concentrations) are explored and an optimal combination of these process parameters is found for maximisation of the phenol fluxes in both modules. The extraction/stripping performance of the coupled HF modules was compared when using different organic solvent (alcohols and alkanes). Analysis of the mass-transfer resistances of the different liquid layers in both modules is presented based on mathematical model and experimental data from equilibrium measurements and kinetic experiments. It is found that an important part of the overall resistance is located in the aqueous phase's boundary layers. A substantial improvement of the stripping yield is reached by using a series of stripping modules.
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Things To Consider Before Purchasing A Branson Ultrasonic Cleaner
Branson ultrasonic cleaners feature a variety of different models for all kinds of applications whether in scientific, medical or dental laboratories, for the cleaning of glasses, watches, and jewelry, or for industrial applications like removing flux and other contaminants from electronics and grease and dirt from switches assemblies and gears.
The Branson line of ultrasonic cleaners includes an assortment of table top models and industrial models of tank sizes from 5-80 gallon capacity. Additionally, Branson builds custom- sized ultrasonic cleaning equipment of different sizes available either with mechanical or digital timers and with or without a heating system. Branson has more than 60 years of experience in ultrasound technology. All cleaners use industrial grade transducers and the capacity to use sweep frequency (a frequency modulation that maximizes cleaning power uniformity). The cleaners enjoy a good reputation and are covered by a two-year warranty from the manufacturer. Branson ultrasonic cleaners are the most popular brand on the market, but are they worth it?
Other manufacturers of ultrasonic cleaners include Crest Ultrasonic, Elma Ultrasonic, L&R Ultrasonic, and SharperTek Ultrasonic. Here are brief descriptions of these manufacturers’ products and a summary comparison between the Branson line and ultrasonic cleaners of these companies.
Crest Ultrasonic:
Crest offers seven different sizes of bench top ultrasonic cleaners that come either with a mechanical or a digital timer and heater. The digital models come with a degas function that is used for degassing new cleaning solutions and HPLC solvents. Degassing cleaning solutions increases the cleaning capacity as gas bubbles interfere with cavitations. The heater is optional in the analog models. All models have sweep frequency capacity and are covered by a two year manufacturer warranty. Crest’s product line also includes large industrial ultrasonic cleaners and submersible ultrasonic transducers. Crest ultrasonic cleaners employ a new patented sweeping technology that the company claims eliminates hot spots and improves cleaning efficiency.
Elma Ultrasonic:
Elmasonic S ultrasonic cleaners are available in a range of models, sizes and capacities. Bench top units range from 0.2 gallon to approximately 24 gallon tanks. These units, all with a 2-year warranty, are employed across a broad spectrum of laboratory and industrial cleaning and degreasing applications. Elma S-line ultrasonic cleaners all have a sweep feature for improved cleaning results and a degas function. They also have a “normal” setting for standard laboratory applications like dissolving, dispersing and blending. Models are available with heated ultrasonic tanks that work from room temperature to 80 C (176 F); all feature digital timers. Accessories include baskets with plastic coated handles, cooling coils, clamps for Erlenmeyer flasks, acid-proof tanks, and holders for 1 liter HPLC solvent flasks for HPLC solvent degassing. Noise-reducing covers can be flipped over and used as a tray and drip-off basin. Collected cleaning liquid can be emptied back into the tank. Large capacity industrial ultrasonic cleaners are also available.
L&R Ultrasonic:
L&R Ultrasonics offers two different lines of bench top ultrasonic cleaners: Quantrex and SweepZone Technology. Quantrex is optimized for its economic value and SweepZone Technology promises uniform cleaning power while eliminating hot spots and weak areas. There are six different sizes of Quantrex models available, all featuring mechanical timers and optional heaters. The more expensive SweepZone Technology models use an electronic component called “Smart Circuit” to optimize the cleaning cycle. It uses pulse width modulation to sense cleaning loads, solution level and voltage fluctuations. This information is used to automatically adjust to different conditions and to create a constant power output and uniform cleaning power without hot spots or weak areas throughout the entire tank volume. L&R Ultrasonics also provides industrial size ultrasonic cleaners with the SweepZone Technology. These come in six sizes from 5-42 gallons tank capacity. The products are covered by different warranty options ranging from 1 to 2.5 years.
SharperTek Ultrasonic:
SharperTek offers six different sizes of bench top ultrasonic cleaners for a variety of different applications. Unlike the other providers, SharperTek’s website showing the bench top cleaners includes a telephone number that can be called for assistance with deciding which cleaner is the most suitable for a given application. Four of the six models come with a mechanical timer; the other two are digitally controlled. Five are heated. Industrial cleaners with tank capacities of 10 liters and more are also available. Warranty duration is 2 years.
Conclusions on Branson Ultrasonic Cleaners:
Economy models that do not feature sweep technologies are significantly less costly, and might be a good alternative for certain applications where a very even ultrasonic power field throughout the entire tank area is not that important. Examples include cleaning jewelry and watches or degassing, dissolving, and dispersing applications. Some manufacturers offer features that are not available in Branson models. Ultimately a buying decision depends on the application and the budget, and determining which ultrasonic cleaning system is the most suitable. The point is, there are many viable alternatives to a Branson system on the market, and it is very well worth the effort to compare their prices and features before deciding which brand and model to buy. If the application requires a sweep system, it might be best to request a demo-model to be able to directly compare cleaning power and suitability of the system for one’s own application, before investing in a high-end ultrasonic cleaner that eventually falls short of expectations.
About the Author
Emergerncy...help please~?
2. A student, following the procedure described in this module, used water as the solvent and encountered some interesting problems. Comment on the effect, if any each of the following situations could have had on the experimental results.
a) The unknown, a white powder, failed to dissole in the solvent.
b). The student returned to the laboratory instructorr for a different solid unknown dissolved, but bubbles were seen escaping from the solution almost immediately after the addition of the solid.
c.) As the student was setting up the apparatus to measure the freesing point of the unknown solution, the thermometer assembly broke. The student obtained a new thermometer and performed the experiment as instructed.
The important background for this set of questions has not been included, ie. 'the procedure described in this module'. One cannot understand the effect, if any, of any situation, without knowing the experimental design.
Rocket Stock or Dud?
The bigger they are, the harder they (might) fall.
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