Choline chloride solution   
 
Active ingredient
Choline chloride

Recommended materials

 

Depending on the temperature and oxygen content, choline chloride in liquid form behaves corrosively to a varying extent. Only very specific materials are suitable for the storage and pro­ cessing of choline chloride solution 75%. The statements made in the following tables are based on test results, many years of working experience and practical applications. The stability data apply exclusively to 75% strength choline chloride.

Product number
0009700
 
Product number
0009700

Specification
 
       
Content at least 75% choline chloride (argentometrically)    
       
Trimethylamine not more than 0.05%    
   
Materials for storage and use
 
           
  Highly alloyed steel Plastics Boilerplate (rubberized) PTFE (Teflon) Palatal PVC
 
Storage container        
Pipelines      
Pumps      
Valves        
Nozzles        
Fittings      
Seals      
   
Other chemical and physical data
   
 
Water content about 25%
Appearance clear, aqueous,nearly odorless solution
Density 0 g/ml (20°C)
Boiling point at temperatures above 00°C the water evapora tes and the salt
Crystallization point crystallizes – 8°C
Viscosity 2 mPa•s (at 20°C)
Electrical conductivity 30,000 mS/cm (mS = micro Siemens)
PH value
5.5–6.5 (in 5% solution in dist. water)
 
Stability
   
  Choline chloride is stable. The direct addition of choline chloride to the feed mixture as an individual component has proved suitable. Problems in the premix are thus avoided.
   
Metallic materials
   
  The corrosiveness of choline chloride increases with the temperature and oxygen content. Water­diluted choline chloride also acts more corrosively than the 75% strength material. For choline chloride liquid metering plants, highly alloyed, austenitic chrome­nickel­molybde­ num steel (for example X 6 CrNiMoTi 7 2 2, material no.: .457 ) is recommended.
   
Recommendations when using highly alloyed steel
 
       
Materials Aeration Resistance up to a threshold temperature of
.454 yes No -
.454 No yes 45°C
.457 yes yes 45°C
.457 No yes 80°C
   
  Molybdenum­free chrome­nickel steel (for example X 6 CrNiTi 8 0, material no.:
.454 ) is not resistant to corrosion, as the oxygen­free choline chloride solution supplied is usually enriched with oxygen from the air on transferring to a tank. Under these conditions, and also on exceeding the threshold temperature, local pit and crack corrosion occurs in the highly alloyed stainless steels. Contaminations (for example iron salts or residues from a prior other use of the tank) can also increase the corrosiveness of the choline chloride. In this case, corrosion can also occur at temperatures lower than those mentioned in the table. In these cases and when constructing new plants, glass fiber­reinforced plastics are to be preferred to the metallic materials.

Plastics

  Plastics are resistant to pit and crack corrosion in oxygen containing and oxygen free choline chloride. For many years, plastics have been used successfully for the storage of choline chloride. In particular, glass fiber­reinforced plastics (GSP) can be employed in various material combinations suited to the specific individual case. Palatal with its types A4 0
and A420 has proved suitable. These are special resins which were stable to choline chloride 75% up to 70°C in the corrosion test. Recently, tanks appropriate to the spatial con­ ditions can also be installed on site with Palatal.
   
Packaging/shelf-life
 

Note

  These instructions replace the leaflet "From research and practice" no. 3, "Advice for the choice of materials when storing and using choline chloride solution 75%". On contact the instructions of the safety data sheet are to be observed.
For transport, storage, loading and unloading of choline chloride solution 75%, the legal water procedures valid in the particular countries are to be observed.

The data contained in this publication are based on our current knowledge and experience. In view of the many factors that may affect processing and application of our product, these data do not relieve processors from carrying out their own investigations and tests; neither do these data imply any guarantee of certain proper­ ties, nor the suitability of the product for a specific purpose. Any descriptions, drawings, photographs, data, proportions, weights etc. given herein may change without prior information and do not constitute the agreed contractual quality of the product. It is the responsibility of the recipient of our products to ensure that any proprietary rights and existing laws and legislation are observed. June 2005