Quimico

APPLICATION NOTE
MultiTek® Detecting Halides & Sulfur Compounds in Liquefied Petroleum Gas (LPG) by Oxidative Pyrohydrolytic Combustion followed by Ion Chromatography Conductivity Detection
• • •Fully Automated Combustion System Halogen Determination Sample Versatility

REACTIONS
• Halogen Reaction
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��− ���� − ���� − 1050℃ +��2 +��2 ��

�� − ��(��− ����− ���� − )

Keywords:MultiTek, pyrohydrolysis, halides, liquefied petroleum gas (LPG), n-butane, fluoride, chloride, bromide, sulfate, combustion ion chromatography (CIC)

• Sulfur Reaction
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1050℃ +��2 +��2 ������2

���������������� ����������������

SO32− + SO42−

To ensure the highest oxidization conversion from sulfite to sulfate, optima grade hydrogen peroxide can be added to the scrubber solution.INTRODUCTION
Hydrofluoric acid alkylation is a common technique for the production of high octane gasoline and LPG fractions such as n-butane and propane. Even though acid settlers and adsorbentbeds are used to remove fluoride, traces still manage to make it into the final product that is delivered to the consumer. Butane is a common feed used in production and can be blended with othercompounds to achieve a desired product. When the fluorides, chlorides and sulfur in the butane react, they can produce extremely corrosive acids such as hydrofluoric and hydrochloric acids. As a result,gas leaks can evolve from these corrosive effects and pushes the need to monitor concentrations of halides. This procedure analyzes total halogens and sulfur compounds (F/Cl/Br/SO4) in liquefiedpetroleum gases. Specifically n-butane was chosen, but heavier samples such as pentane and hexane are applicable. The process starts with pyrohydrolysis of the samples at 1050ºC. In the pyrotube with thehelp of steam, halogen containing compounds are converted into an acid gas state. Sulfur containing compounds are oxidized to sulfur dioxide (SO2) and in a unequalled occurrence eventually converted...