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Poly(ethylene glycol) CAS NO.25322-68-3

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price: 1.00元/Kilogram
minimum: 1 Kilogram
Total supply: 999999 Kilogram
Delivery term: The date of payment from buyers Deliver within days
seat: Asia-Pacific China
Validity to: Long-term effective
Last update: 2016-09-13 13:59
Browse the number: 166
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Keywords

  • Polyethylene glycol
  • polyethylene oxide standard 511000
  • Poly ethylene glycol

Quick Details

  • ProName: Poly(ethylene glycol)
  • CasNo: 25322-68-3
  • Molecular Formula: (C2H4O)mult.H2O
  • Appearance: Transparent colorless viscous liquid
  • Application: 1. As papermaking additive can improve...
  • DeliveryTime: soon! in stock now!
  • PackAge: according to the clients requirement
  • Port: tianjin or shanghai or shenzhen
  • ProductionCapacity: 50 Kilogram/Day
  • Purity: 99.5%min
  • Storage: Dry place in sealed container
  • Transportation: Fedex or DHL or UPS or EMS or EUB or T...
  • LimitNum: 5 Kilogram
  • Place of orgin: China

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Details

Preparation polyoxyethylene (25322-68-3) is: from the condensation of ethylene glycol and water, or by the addition polymerization of ethylene oxide derived. Identification tests: Solubility: an apparent molecular weight of 1,000 (or more) of polyethylene glycol, easily soluble in water. Polyethylene glycol soluble in many organic solvents include aliphatic ketones and aldehydes, chloroform, ethylene glycol ethers, esters and aromatic hydrocarbons; insoluble in ether, and most aliphatic hydrocarbons. In water and organic solvents solubility decreases with increasing molecular weight. Apparent molecular weight: apparent molecular weight of less than 1,000 persons, 95.0% to 105.0% of the declared value; apparent molecular weight of 1,000 to 7,000 persons, 90.0% to 110.0% of the declared value; higher than 7000's, as the declared value 87.5% ~ 112.5%. Quality Index Analysis: 1. acidity (acetic acid meter) sample taken 6g, placed -250ml Erlenmeyer flask, add phenolphthalein test solution (TS-167) and a few drops of neutral ethanol 50ml, with 0.1mol / L potassium hydroxide ethanol droplet to the pink and maintained 15s. Consumption of titration must not exceed 0.5ml. 2. Determination of ethylene oxide in the following manner. (1) Preparation of morpholino solution: from a distilled morpholine and nine anhydrous methanol mixture. (2) Preparation of mixed indicator: Take 4,4'-bis - (2,2'-azo-1-naphthalene sulfonic acid stilbene) 0.050g and bright yellow 0.010g, is placed in a 60ml vial. Was added 0.1mol / L sodium hydroxide 1.5ml, mix. 3.5ml mixed with water. The above mixture with 45ml methanol people wash bottle storage, mixing spare. Preparation of standard solution of hydrochloric acid in methanol (3): hydrochloride 8.5ml, anhydrous methanol mixed with 1000ml. Take this solution 9.00ml, add phenolphthalein test solution (TS-167) a few drops of calibration with 0.1mol / L sodium hydroxide solution. After more than 48h to be re-calibrated. (4) Operation: anhydrous methanol 50ml, placed -250ml Erlenmeyer flasks. Add the mixed indicator 4 to 6 drops of hydrochloric acid and methanol above criteria titrated to pure blue. Plus a sample of about 25g (accurately weighed), as a blank sample solution, shaking until completely dissolved. Titrated with standard hydrochloric acid and methanol to pure blue, Pro titration end point should be carefully dropping a small amount. (5) take the morpholino solution 50ml, placed in a heat-pressure bottle, and take the same amount of morpholino solution was placed in a small bottle, as a reagent blank. In the first sample flask only about 25g (accurately weighed), shaking until completely dissolved. Mesa, the bottle firmly back into the bag for wrapping. The next two bottles together into 98 ℃ ± 2 ℃ water bath. Maintain 30min, the water level in the water bath should be slightly higher than the level of the bottle. After removing the air cool to room temperature. Loosen the wrap belt, to cover in order to release excess pressure, and then removing Wrap. 20ml of acetic anhydride was added slowly in each bottle, shake until completely dissolved. Then placed 15min at room temperature. Such as bottles remained warm, it needs to cool to room temperature. In each flask add 4 to 6 drops of mixed indicator, and then titrated standard hydrochloric acid in methanol to pure blue, towards the end need a small amount slowly dropping. 3. Determination of ethylene glycol and diethylene glycol: an apparent molecular weight polyethylene glycol is less than 450 samples. ① instrument: choose a suitable gas chromatograph connected to a flame ionization detector, with a 15m × 3mm (inner diameter) stainless steel column; not with 60/80 mesh acid-washed diatomaceous earth (Chromosorb W or similar product) as carrier, with 12% (by weight) sorbitol as a mobile phase. ② The basic operating conditions: column temperature 165 ℃; ammonia carrier gas (or other inert gas) flow rate of 70ml / min; Recorder: -0.5 ~ + 1.05mV, full scale response time LS; hydrogen flow of combustion air and should be ensure maximum sensitivity. ③ Preparation of standard solution: Weigh accurately pre-prepared by the distilled ethylene glycol and diethylene glycol amount, dissolved in water to prepare a standard chromatography, concentration two standard solutions are each 1 ~ 6mg / ml. ④ Preparation of test solution: accurately weighed sample of about 4g, placed in a 10ml volumetric flask, water volume after mixing spare. ⑤ Operation: Take these two standards each 2μl, into the chromatograph, and each obtained chromatogram. Under standard conditions, the average residence time of the ethylene glycol 2min, diethylene glycol is 6.5min. Amount of peak height and record the following values: Ethylene glycol peak height A, mm; B concentration standard solution in ethylene glycol, mg / ml; diethylene glycol peak height C, mm; standard solution in diglycol D concentration of alcohol, mg / ml. Specifications: Item Index Melting point / ℃ 66 ~ 70 Apparent density / (kg / L) 0.15 ~ 0.30pH value of 6.5 to 7.0 decomposition temperature / ℃ 423 ~ 425 true density / (kg / L) 1.15 ~ 1.22

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