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Technical Data Sheet
Choline hydroxide 45% (CB45)


Chemical Synonym
  • Choline base; C-base
Applications
  • Electronic chemical cleaners
  • Industrial electronics

Product Description
Choline base is a strong organic base. It finds its application in cleaning and degreasing of metal surfaces. Eastman uses ultrapure water to produce choline base. This allows the product to be used in microelectronics manufacturing in formulations for wafer cleaning and developers.

Choline base tends to decompose slowly upon storage and when heated, resulting in release of trimethylamine and discoloration of the liquid. Eastman developed a stabiliser to cope with these unwanted effects. The stabiliser is based on high boiling organic compounds, avoiding the introduction of mineral anionic components.

Choline base is a 45% aqueous solution.

Choline base finds its major application as ingredient of cleaning and developer formulations in the microelectronics industry.

Choline base can be used as cleaning and degreasing agent in the metal industry. Removal of grease from carbodies, before phosphatation and application of the CED – coating, is a typical example.

Choline base can be used in paint stripping formulations.

Choline base can be used as a corrosion inhibitor.

Choline base can be used for H2S removal from gas streams.

Choline base can be used for the synthesis of choline salts. Choline salts like choline bitartrate and choline citrate are used in nutraceuticals, baby food, etc. Choline chloride – formerly known as vitamine B4 - is mainly used as a growth promotor in animal feed.



Typical Properties

PropertyTypical Value, Units
General
Molecular FormulaC5H15NO2
Molecular Weight121.2 g/mol
AppearanceColorless to light yellow liquid
Autoignition Temperature380 °C
Boiling Point90-99 °C
Density 
     @ 20°C1.08 g/cm3
Dissociation constant, pKa11.2
Flash Point 
     Closed Cup>99 °C
Freezing Point<-20 °C
Octanol-water partition coefficient, log Pow 
     @ 25°C-2.25
pH14.9
Vapor Pressure 
     @ 25°C28.284 hPa
Viscosity 
     @ 20°C25.3 mPa·s
Water solubilitySoluble (486 g/l)



Principal chemical properties
Formation of salts, saponification
Choline base will react with all acids, resulting in the production of the corresponding salt.Choline base can be used for the saponification of esters, like vegetable oils and greases, ester based photomasks, …

Stability
Choline base decomposes in the absence of amines. The decomposition is accelerated by heat. During decomposition trimethylamine is formed, as a result the product will have a fishy odour. Aldehydes which are formed during the decomposition will result in discolorisation.

Packaging
  • Bulk
  • PE drums (224 kg net)
  • IBC containers (1100 kg net)


Storage
Choline base can be stored in a stainless steel storage tank or in its original packaging. Keep the storage tank under a nitrogen blanket to minimise the risk of discolorisation. Minimise the contact with air. If possible keep the product in a cool area or a cooled tank.

Choline base is a corrosive liquid. Wear suitable protective clothing, gloves and goggles when handling the product.



Comments
Properties reported here are typical of average lots. Eastman makes no representation that the material in any particular shipment will conform exactly to the values given.


Eastman and its marketing affiliates shall not be responsible for the use of this information, or of any product, method, or apparatus mentioned, and you must make your own determination of its suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. No warranty is made of the merchantability of fitness of any product, and nothing herein waives any of the Seller's conditions of sale.


10/3/2018 4:28:56 AM