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This study investigated the effect of hydrophilic-lipophilic balance (HLB) numbers of sorbitan monoesters on equilibrium conditions of cyclopentane hydrates in water-in-oil emulsions with or without NaCl. HLB numbers of the surfactants (Span 20, 40, 60, and 80), which have the same hydrophilic group, are determined by the length and shape of alkyl chain and the HLB number refers to hydrophobicity...
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