Chemicals
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Molecular sieve
Molecular sieves are often utilized in the petroleum industry, especially for drying gas streams. For example, in the liquid natural gas (LNG) industry, the water content of the gas needs to be reduced to less than 1 ppmv to prevent blockages caused by ice.
In the laboratory, molecular sieves are used to dry solvent. "Sieves" have proven to be superior to traditional drying techniques, which often employ aggressive desiccants.
Under the term zeolites, molecular sieves are used for a wide range of catalytic applications. They catalyze isomerisation, alkylation, and epoxidation, and are used in large scale industrial processes, including hydrocracking and fluid catalytic cracking.
They are also used in the filtration of air supplies for breathing apparatus, for example those used by scuba divers and firefighters. In such applications, air is supplied by an air compressor and is passed through a cartridge filter which, depending on the application, is filled with molecular sieve and/or activated carbon, finally being used to charge breathing air tanks.Such filtration can remove particulates and compressor exhaust products from the breathing air supply.
Dicyclohexylamine (DCHA)
CAS NO. 101-83-7
Molecular Formula： C12H23N
Appearance ：Colorless Clarity Liquid
Vapour Pressure： 1.6kPa/37.7℃
Flashing Point ：96℃
Melting Point： -2℃
Boiling Point ：255.8℃
Density：0.91
Hazard Identification：Alkaline Corrosion, Inflammable
N-Methyl-Pyrrolidone (NMP)
CAS NO. 872-50-4
Molecular Formula ：C5H9NO
Appearance： Colorless Clarity Liquid
Vapour Pressure： ＜0.13kPa（20ºC）
Flashing Point： 86℃
Melting Point： -24℃
Boiling Point： 202℃
Density： 1.028-1.035
γ-Butyrolactone (GBL)
CAS NO. 96-48-0
Molecular Formula： C4H6O2
Appearance： Colorless Clarity Liquid
Vapour Pressure： 2.0kPa/20℃
Flashing Point ：98℃
Melting Point ：-44℃
Boiling Point ：204℃
Density： 1.128
Clohexylamine
CAS NO. 108-91-8
Molecular Formula： C6H13N
Appearance ：Colorless Clarity Liquid
Vapour Pressure： 1.17kPa/25℃
Flashing Point ：32℃
Melting Point ：-17.7℃
Boiling Point ：134.5℃
Density： 0.86
Hazard Identification ：Alkaline Corrosion, Inflammable
Clohexylamine
CAS NO. 1310-65-2
Molecular Formula： LiOH.(H2O)n
Appearance ：Hygroscopic white solid
Vapour Pressure： 4.76 wt. % (2.09 molal)
Flashing Point ：Non-flammable
Melting Point ：462 °C（864 °F；735 K）
Boiling Point ：924 °C (1,695 °F; 1,197 K) decomposes
Density：1.46 g/cm3 (anhydrous)
1.51 g/cm3 (monohydrate)
Hazard Identification ：Corrosive
Photoinitiators
Photoinitiators are compounds that produce radicals when exposed to UV light. These then react with monomers and / or oligomers to initiate polymer chain growth. They are essential ingredients of all UV-curable adhesives, inks and coatings.
Free radical UV photoinitiators can be classified into Norish type I and II initiators.
Norish type I initiators are typically compounds containing benzoyl groups. The carbonyl group of the initiator absorbs a photon and is transformed into an excited state. Subsequent homolytic cleavage of the excited α-carbon bond produces two radical fragments.
