Documents about Methylene Chloride

  • 3 Pages


    Michigan State University, CE 485

    Excerpt: ... equirements for the liner are a compacted clay liner having hydraulic conductivity (k) 5 x 10-8 cm/s. The leachate collection system for the cell is designed such that the maximum leachate head on the liner is 300 mm. Leachate that will be produced from the hazardous waste will contain these two key contaminants of concern: methylene chloride and toluene. Maximum concentrations of methylene chloride and toluene in the leachate are expected to be 8 mg/L and 35 g/L, respectively. Assume that the design life of the cell is 50 years. Data from literature suggests that the effective diffusion coefficients for methylene chloride and toluene are 1.5 x 10-6 and 5 x 10-6 cm2/s, respectively. Assume the partition coefficient (Kd) for methylene chloride for the clay soil is 0.13 mL/kg and for toluene it is zero (non-sorbtive). State and federal ground water standards require the flux of leachate from the cell not to exceed 0.4 kg/ha/yr for methylene chloride and 3 grams/ha/yr for toluene. Spartan Soil Testing lab has ...

  • 5 Pages


    Washington, CHEM 241

    Excerpt: ... in separating the two components of the mixture? Briefly state why or why not. The separation was not successful as the GC trace shows 2 components, both with substantial area indicating a modest % composition of both. d) (4 pts) In the space provided below, sketch the GC trace of the 1st mL of the fractional distillation of this mixture (what would it probably look like). The fractional distillation should do a better job at separating the 2 liquids. Therefore we'd expect a large peak for the low boiling component (retention time ~ 2 mins) and a small to non-existent peak for the high boiling component (retention time ~4.2 mins) _ 0 1 2 3 4 5 6 7 time (in minutes)-> 3. (5 pts) Make a temp vs volume graph of a fractional distillation of a 30 mL mixture of 33% methylene chloride and 66% hexane. Assume this distillation completely separated the two components. Methylene chloride boils at 40 C and hexane at 69 C. The 1st 10 mL will be methylene chloride ...

  • 6 Pages


    Concordia Moorhead, CHEM 127

    Excerpt: ... lower intestine from where it is then distributed throughout the body upon which it acts as a central nervous and metabolic stimulant. It is estimated at least 90% of Americans consume caffeine on a daily basis. Pure caffeine is a neurotoxic white solid powder which in modern times has been extracted and purified through soaking coffee beans in water and obtaining the caffeine from the resulting solution often simply through evaporating off the solvent. Numerous solvents were used in the past but most have been discontinued for environmental reasons. Due to the small scale upon which this experiment is carried out in the teaching lab and the time constraints, we will carry out our extraction from the pill using one of these solvents, methylene chloride (CH2Cl2). The complication as mentioned previously is that the pills do not comprise pure caffeine but rather contain a mixture of undesired materials. However, we can utilize the partitioning principle to selectively obtain the desired caffeine. First the pill ...

  • 3 Pages


    Cornell, CHEM orgo lab

    Excerpt: ... for your use, in addition to the normal glassware, routine instrumentation, and common solutions and other reagents usually available in the lab. The fact they are here does not mean you should use any (or all) of them. 1) Simple and fractional distillation columns. 2) 10% Na2CO3 (a weak base) 3) Concentrated HCl 4) CaCl2 and/or MgSO4 (drying agents) WASTE DISPOSAL: Solvents (ethanol, acetone, methylene chloride , etc.): Organic Waste bottle. Aqueous Extracts: If theyve been in contact with any methylene chloride , Organic Waste bottle (extracts are saturated with methylene chloride ). Otherwise, flush down the sink. Magnesium sulfate, sodium chloride, etc.: Flush down the sink. ...

  • 31 Pages

    Chapter 5 Slides

    FSU, EML 3234

    Excerpt: ... D = -D dx x2 - x1 Example: Measuring the Effectiveness of Chemical Protective Clothing (CPC) Methylene chloride is a common ingredient of paint removers. But it is an irritant and can be absorbed through skin. Protective gloves are needed. How thick should they be? Butyl rubber gloves (0.04 cm thick) are commonly used: what is the diffusive flux of methylene chloride through the glove? Data: diffusion coefficient in butyl rubber: D = 1.10 x10-6 cm2/s C1 surface concentrations: = 0.44 g/cm3 C2 = 0.02 g/cm3 Such a test is easy to run by putting the glove into a stronger solution with a weak solution placed inside the glove (no hands!) Example (cont). Solution assuming linear conc. gradient glove C1 Outside tb = l2 6D inside dC C 2 - C1 -D J = -D dx x 2 - x1 C2 x1 x2 Data: D = 1.10 x 10-6 cm2/s C1 = 0.44 g/cm3 C2 = 0.02 g/cm3 x2 x1 = 0.04 cm J = - (1.10 x 10-6 cm ) s 2 (0.02 g g - 0.44 ) 3 cm cm 3 = 1.16 x 10-5 g (0.04 cm) cm 2s I always find i ...

  • 2 Pages


    UCSB, CHEM 6a

    Excerpt: ... polar, and aldehydes and ketones have a larger molecular dipole moment than do alkenes. Addition of a "hydride" anion to a polarized aldehyde or ketone produces an alkoxide, which on protonation yields the corresponding alcohol. Aldehydes give 1-alcohols and ketones give 2alcohols. The IR and it salt plates What happens when you place salt in water? It dissolves. What happens when you place your sweaty fingers on a salt plate? It dissolves the salt, leaving a fingerprint on the plate. Hold a plate as shown. The thin film technique: Obtain a salt plate. Salt plates are stored in desiccators. Ideally, the plate was put away clean, although not all students are considerate enough to clean plates after use. If necessary, clean the plates with a small amount of methylene chloride . Ideally, the plates should be transparent, but quite foggy plates usually give acceptable spectra. Take a background spectra of the clean dry salt plate (4 scans). If your sample is a liquid, use a pipet to place a drop of your ...