Nanjing Chemical Material Corp.
Service
Products

How to Use DMC Catalyst to Produce Polyether Polyols? How to Use DMC Catalyst to Produce Polyether Polyols?

The DMC catalyst is double metal cyanide catalyst. Compared with similar polyols made using basic(e.g., KOH)catalysts, polyether polyols made from the catalyst have low unsaturations, narrow molecular weight distributions, have high molecular weight, and are useful in making a variety of polyurethane products. DMC catalyst is highly active in epoxide polymerization reactions used to prepare polyether polyols.

We can yield the DMC more than 20000 kg within one year, and thus afford to produce 50~70 ten thousand tons of polyols. This catalyst is white or light yellow powder, is suitable for preparation of polyols with 1~6 functions. Compared with basic catalysts, this catalyst can be used with less amount (30ppm), and reaction time of polymerization is reduced largely, and the polyols products are not necessary to be refined. The DMC is suitable for using in common epoxide polymerization reactors, but it can be better if reactors have both of stirring and cycling systems.

When using the DMC production period is short, thus the costs for production are reduced while the property of products are advanced.

Conditions wanted for initiators

1. polyethers with 1~3 0r more hydroxyl groups
2. molecular weight:for at least 2 hydroxyl groups---350~1000; for monols---with boiling point more than l00℃
3. ∑Mn+ (mainly for K、Naions)≤5ppm
4. water content≤0.1%
5. acid value≤0.15mgKOH/g

Applying procedure

1. Weigh certain amount of initiator and the catalyst. The catalyst's amount is generally 30ppm relative to the product (it mainly refers to N220 with 2 hydroxyl groups and N330 with 3 hydroxyl groups). The amount of the catalyst can reduce if the molecular weight of products are  relatively high, e.g. for N240, the amount can be 20~25ppm.
2. The mixture is stirred and is stripped under a vacuum with pressure less than l0 mm (Hg), and is heated to 130~145℃ to remove traces of water from the starter. Generally it needs more than 40min after the temperature  rises to 130~145℃.
3. Propylene oxide (PO) or mixture of ethylene oxide (EO) and PO is fed to the reactor, under a pressure of 0.1—0.25Mpa. Additional PO or PO and EO is not added until an accelerated pressure drop occurs in the reactor (temperature can reach above 180℃,but this can not harm the activity of DMC or the properties of products). PO or PO and EO is added while maintaining a reactor pressure generally less than 0.1Mpa,temperature 140±10℃.
4. After PO or PO and EO addition is complete, the mixture is held at 140±5℃ until a constant pressure is observed. Residual unreacted monomer (generally only traces) is then stripped.
Related Products Wiki
  • Preparation of Ethyl Iodide

    Preparation of Ethyl Iodide

    April 29, 2019Ethyl iodide is usually reacted with ethanol, iodine and red phosphorus, but the reaction is slow, and it needs to be heated in a reflux device for several hours.view
  • Methyl Iodide Residual

    Methyl Iodide Residual

    April 15, 2020Methyl iodide has been highlighted as a potential genotoxic impurity (PGI).view
  • 2018 NCMC Sports Meeting

    2018 NCMC Sports Meeting

    January 29, 2019Before the summer heat arrives at Nanjing, 2018 NCMC sports meeting is held on 27th May with the purpose of enriching the amateur life of employees as well as enhancing team cooperation.This sports me...view
  • Methyl Iodide Used in Pharmaceuticals

    Methyl Iodide Used in Pharmaceuticals

    April 15, 2020Iodomethane (Methyl iodide) is a colorless liquid. It can be prepared by reacting dimethyl sulfate with concentrated KI.view
  • Production and Function of Monoammonium Glycyrrhizinate

    Production and Function of Monoammonium Glycyrrhizinate

    April 21, 2020Monoammonium glycyrrhizinate in China is a chemical substance. This product is mainly used for the treatment of chronic persistent hepatitis, chronic active hepatitis, liver poisoning, and early liver...view
  • Team Building @ Laoshan National Forest Park

    Team Building @ Laoshan National Forest Park

    January 31, 2018In the golden month of October when Osmanthus are in bloom, we set out for the Laoshan National Forest Park, which is renowned as the “Green Lung of Nanjing, Bright Pearl of Northern Yangtze River”....view
Related Products
  • Monoammonium Glycyrrhizinate Product Name: Monoammonium GlycyrrhizinateChemical Formula: C42H65NO16CAS No.: 53956-04-0Dangerous Grade: NoneTechnical Data of Monoammonium GlycyrrhizinateITEMSPECIFICATIONAppearancewhite or yello...
  • Methallyl Alcohol Product InformationProduct Name: Methallyl AlcoholChemical Formula: C4H8OCAS No.: 513-42-8Dangerous Grade: 3.2Technical Data:ITEMSSPECIFICATIONSAppearanceColorless transparent liquidChroma≤10Water Co...
  • Polyether Polyol 12000 Product Name: Polyether Polyol 12000Chemical Formula: N/ACAS No.: N/ADangerous Grade: NOTechnical Data of Polyether Polyol 12000ITEMSSPECIFICATIONAppearanceTransparentColority(APHA)≤50Hydroxyl value...
  • Lithium Nitrate Product InformationProduct Name: Lithium Nitrate Chemical Formula: LiNO3CAS No.: 7790-69-4Dangerous Grade:Technical Data:ITEMSSPECIFICATIONLiNO3 (Assay)≥99.0%Ca≤0.005%Mg≤0.0002%Fe≤0.0001%Cl≤0.02%...
  • TEL:+86-25-52337978
  • EMAIL: info@njchm.com
  • ADDRESS:12/F, Block B, Technology and Innovation Building, Nanjing University of Technology, No.5 New Model Road, Nanjing 210009, China