Documents about Methylene Chloride

  • 3 Pages

    hw-3a

    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 ...

  • 33 Pages

    HW3

    Michigan State University, CE 485

    Excerpt: ... ments 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 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 mea ...

  • 3 Pages

    Properties of Hydrocarbons-Experimental

    Villanova, CHM 2201

    Excerpt: ... wns. Cross contamination of samples will invalidate your results! B. Test for Relative Density Reexamine the above mixtures prepared above and observe whether the hydrocarbon is more dense (sinks to test tube bottom) or less dense (floats on top of water) than water. Page 1 of 3 C"#!$%&! Organic!Chemistry Lab I 'all!$%*! +e-artment!o3!Chemistry! Villanova University C. Bromine Addition 1. In a 20 mL beaker (a supply of these beakers is available in the center instrument room), obtain ~7 mL of methylene chloride (dichloromethane) from the reagent bottle in the community hood. 2. Place ~1 mL (use a disposable pipet to dispense) of the methylene chloride in each of the next group of 5 test tubes. 3. Add 5 drops of cyclohexane to the first test tube containing methylene chloride and then add 5 drops of your other knowns and unknowns to the remaining labeled test tubes containing methylene chloride . 4. Take these test tubes to the community hood and add in a dropwise fashion 3 drops of a 2% solution of bro ...

  • 5 Pages

    sample_examQuiz2key

    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

    Expt3Caffeine

    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 ...

  • 2 Pages

    ps06sep

    Minnesota, CHEM 4242

    Excerpt: ... Problem Set 6 Chem 4242, Spring 2005 Due Monday, April 18 Note: Unless otherwise indicated Kd and D are defined with organic phase in the numerator. 1. For the distribution of an organic acid HA (pKa = 4.5) between water and methylene chloride , Kd = 1.0 x 103, where the distribution coefficient Kd = [HA]o/[HA]w. For a system containing 10 mL of methylene chloride and 100 mL water at pH 7.0, calculate a) the distribution ratio, b) the capacity factor, k, c) the fraction extracted (into the organic solvent) after one extraction, d) the fraction extracted after three extractions (using same volume ratio). 2. Derive a relation between fraction extracted into orgranic solvent and the capacity factor k, based on their respective definitions. For a distribution coefficient Kd = 20, show by calculation which of the following is more effective: a) extraction of 10 mL of an aqueous solution with 20 mL of organic solvent, b) extraction of 10 mL of an aqueous solution with 10 mL of organic solvent followed by another ext ...

  • 3 Pages

    Chemistry_2510_Lab_Practical_S_2009

    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. ...

  • 23 Pages

    DNA SYNTHESIS

    Allegheny, CHEM 236

    Excerpt: ... e detected by treatment with acid vapor (HCl) which causes the hydrolysis of the orange colored DMTr cation. The common solvent systems and Rf values for the modified nucleosides are given below. (When possible, compare your sample to the pure material.) SOLVENT 1 METHANOL:CHCl3 1:9 SOLVENT 2 ETHYL ACETATE: METHYLENE CHLORIDE :TRIETHYLAMINE 45:45:10 THYMIDINE O-DMTr-THYMIDINE O-DMTr-thymidinephosphoramidite SOLVENT 1 .2 .55 SOLVENT 2 .23 .8 9 PREPARATION OF PHOSPHOAMIDITES DEOXYRIDONUCLEOSIDE-3 -O(N,N-DIISOPROPYLAMINO) PHOPHORAMIDITES Note: everything used in the synthesis must be dried prior to use. Plan ahead! Weigh out 0.5 mMol of dry blocked deoxyribonucleoside and place into a 3 mL kimax vial. Add a small stir bar, tighten the lid and wrap with parafilm. Insert a needle through the septum and dry the sample overnight in a vacuum oven. Remove the flask from the vacuum oven and remove the needle. Inject 0.44 mL (2 mMol) of diisopropylamine into the vial, followed by 1.1 mL of dichloromethane. Attach a ...

  • 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

    experiment 1_instructor

    University of Michigan, CHEM 216

    Excerpt: ... Experiment 1: Notes Scale Stoichiometry Solvent Reaction conditions Reaction time Work up (isolation and purification of products) Analysis of product Safety Waste disposal Given solvent: methylene chloride (inert) Scale.based on glassware .use 100 mL RB, fill with how much solvent? 0.055 mol Group assignments 1) reaction set up including glassware (prevent boiling, how to add reagents) cooling, heating; air sensitive; highly reactive so addition rate slow! 2) determine when reaction is complete (TLC.which staring material or product has lower Rf) 3) isolate the product (what is present at end of reaction, what is its solubility?) (inorganics waster soluble, removed by extraction) what is boiling point? 4) characterization of product, safety, and waste (halogenated organics, vs aqueous) Safety!have MSDS available Actual procedure: Aluminum chloride is water sensitive, an irritant, and corrosive. It will react with the moisture on your skin to liberate HCl. Handle it with care, weigh out only what is ne ...

  • 1 Pages

    experimental

    University of Michigan, CHEM 216

    Excerpt: ... A version of the procedure: Aluminum chloride is water sensitive, an irritant, and corrosive. It will react with the moisture on your skin to liberate HCl. Handle it with care, weigh out only what is necessary, and work quickly but safely. Acetyl chloride is also corrosive. Keep it in a hood. Keep all reagent bottles tightly capped. Anhydrous aluminum chloride (0.055 mol, 1.1 equiv) and 15 mL* of methylene chloride were placed in a 100 mL RB with an addition funnel (grease the joints) capped with a septum, reflux condenser capped with septum, and a septum. The system was flushed with nitrogen, venting first through the top of the reflux condenser and then through the addition funnel. Nitrogen was bubbled through the solution venting through the condenser. The mixture was cooled to 0oC in an ice/water bath. Acetyl chloride (0.055 mol, 1.1 equiv) as a solution in 10 mL* of methlyene chloride was added to the addition funnel using a syringe and then to the aluminum chloride dropwise over 10 min. After the additi ...

  • 2 Pages

    exp7w08

    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 ...

  • 4 Pages

    4_7_3_4_5_Crude_Oil

    Penn State, GEOSC 4

    Excerpt: ... the filtrate in 2 ml n-hexane was introduced into the column and stepwise eluted under a moderate vacuum with the following solvents: a. b. c. d. 80 ml n-hexane (Fraction #4), 80 ml a-hexane/ methylene chloride 9:l (Fraction # 5), 80 ml n-hexane/ methylene chloride 1:9 (Fraction # 6), 80 ml benzene/ methylene chloride /methanol 1:1:2 (Fraction #7). Isotopic analyses were performed on various fractions, as indicated in Fig.4.7.3.4.5-1. Nitrogen was extracted from the organic matter using a high pressure digestion Kjeldahl method. The ammonium sulfate formed was subsequently oxidized by hypobromite. The preparation of the analytical gas was carried out as follows: 1. Weigh out a sample in a Pyrex ampule, 300 mg for the 15N determination of an oil sample (typically 0.1to 0.5 wt.% N), and 30 to 50 mg for the 15N determination of the asphaltene fraction (typically 1 to 2 wt.% N). Add 1 ml concentrated H2SO4 per 50 mg of sample. Digest the sample for 16 h at 300C in an open pressure vessel (bomb). Digest the sample ...

  • 36 Pages

    UNC PBPK Lecture II

    UNC, ENVR 430

    Excerpt: ... Physiologically Based Pharmacokinetics Lecture II Me Ande n lvin rse C I T C nte for He Re arch I e rs alth se Octobe 27, 2006 r Unive rsity of North C arolina TODAY'S TOPICS I. PBPK Models for the Metabolism of Methylene Chloride and Application in Risk Assessment - Easy Thinking about Pharmacokinetics while thinking more deeply about terms such as exposure and mixture? - Harder I. I. Metabolism of Inhaled Dihalomethanes In Vivo: Two Pathways How can we measure them? H H Cl Cl Experiments to Get Some of the Needed Parameters for a PBPK Model Gas Chromatograph 5 mL Gas Sampling Loop Stainless Steel Bellows Pump CO2 Scrubber Particulate Filter O2 Monitor Gas Uptakeand Me tabolic Param te e rs Pressure Gauge INTEGRATOR ~ 2.0 L/min Injection Port ~ 100 mL/min Ice Filled Pan for H2O Condensation Desiccator Jar Chamber Vial e quilibration and Partitioning Tissue Partition Coefficients Adding a Different Exposure Scenario C be Volum ham r e Qalv Cinh Qc Cven Lung Blood Alveolar Space Qalv C ...

  • 3 Pages

    Dichloromethane

    CofC, RM 209

    Excerpt: ... 1RS-50, D151RS115, D151SS-115, D151SS-200, D151SS-28, D151SS-50, D151SS19, D154-4, D1544LC, D35-1, D35-4, D37-1, D37-20, D37-200, D37-4, D37-500, D37200LC, D37FB-115, D37FB-19, D37FB-200, D37FB-50, D37POP19, D37POP200, D37POP50, D37POPB19, D37POPB200, D37POPB50, D37RB-115, D37RB-19, D37RB-200, D37RB-50, D37RS-115, D37RS-200, D37RS-28, D37RS-50, D37RS19, D37SK-4, D37SS-115, D37SS-200, D37SS-28, D37SS-50, D37SS19, NC9905243, NC9964976 Synonyms: Methylene chloride ; Methane dichloride; Methylene bichloride; Methylene dichloride; Dichloromethane; DCM. Company Identification: Fisher Scientific 1 Reagent Lane Fair Lawn, NJ 07410 For information, call: 201-796-7100 Emergency Number: 201-796-7100 For CHEMTREC assistance, call: 800-424-9300 For International CHEMTREC assistance, call: 703-527-3887 Section 2 - Composition, Information on Ingredients CAS# 75-09-2 Chemical Name Methylene chloride Percent >99.5 EINECS/ELINCS 200-838-9 Hazard Symbols: XN Risk Phrases: 40 https:/fscimage.fishersci.com/msds/14930.htm S ...

  • 3 Pages

    12elim_091

    N. Kentucky, CHE 310

    Excerpt: ... t. 7.7C). Experimental Procedure: Place 300 mg of 2,3-dibromo-3-phenylpropanoic acid (save a few mg for a later TLC analysis) and 300 mg of potassium carbonate in a 50 mL round bottom flask with a magnetic stir bar. Add 7-10 mL acetone (pre-dried over sodium sulfate) to the flask. Attach a reflux condenser and assemble the apparatus on a heating mantle with a stirrer motor. Reflux the mixture with stirring for one hour. After reflux, cool the solution to room temperature and then remove the acetone using the rotary evaporator. Add RO water (5 mL) to dissolve any remaining solids. Using a Pasteur pipet, transfer the solution to a 12 mL centrifuge tube. Rinse the round bottom flask with 2 mL methylene chloride (why?) and add the solution to the centrifuge tube. In the centrifuge tube, you should see two layers-an aqueous layer on top and an organic layer on the bottom. The organic layer contains your product and may be pale yellow. Using a clean pastuer pipet transfer the organic layer to a 50 mL Erlenmeyer fla ...

  • 7 Pages

    Solvent Seperation

    FGCU, CHM 221

    Excerpt: ... test tube filled with two immiscible solvents in equal volumetric proportion. The two sets of solvents were water and hexane or water and methylene chloride . In each case, the denser solvent comprised the solvent layer below the solution interface in the tube. In all, four different solute-solvent combinations were produced when either methyl red or methylene blue azobenzene dye was added. The four tubes were stopped, shaken and observed before being centrifuged for a short period after which additional observations were noted. In table one, the lighter solvent in either set is in the left column. Table 1: Visible Solvation Effects in Immiscible Solvent Pairs Hexane / / Water Water / / Uncolored, clear Blue Blue Yellow Uncolored, clear Deeper Yellow Pink, slightly cloudy Solute Methylene Blue Methyl Red CH2Cl2 Uncolored, clear Orange Slightly blue Orange Clouded Blue Less clouded After Centrifuge Methylene Blue Methyl Red Blue Pink-orange Characteristics of the nonprotic solvents relative to water as w ...

  • 3 Pages

    sampleexam1

    Nashville State Community College, CHE 101

    Excerpt: ... Chemistry 101 Sample exam 1 (chapters 1, 2 and 4) Closed book, open notes, handouts, homework; no collaboration, 50 minutes. 50 points possible. 1. (1 point) How many significant figures in 0.002050? 2. (1 point) Express 14,200.5 meters in scientific notation. 3. a. (1 point) Methylene chloride at 8C is a liquid that has a density of 1.2 g/ml. What is the temperature of the methylene chloride in kelvins? b. (1 point) What is the volume in milliliters of 12.346 g of methylene chloride at 8C? c. (1 point) What is this volume expressed in cubic centimeters? 4. (1 point) An element is uniquely defined by the number of a. protons it contains c. neutrons it contains b. electrons it contains d. mass it contains 5. (1 point) The element chlorine has two isotopes and an atomic mass of 35.5 amu. If 75% of the naturally-occurring chlorine is chlorine-35 (35Cl), then the other isotope of chlorine should be: a. chlorine-33 b. chlorine-34 c. chlorine-36 d. chlorine-37 e. cant tell from the information given 6. (1 ...