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Process for concentrating a polymer / emulsifying surfactant / hydrophobic liquid composition and concentrated polymer / emulsifying surfactant / hydrophobic liquid
Process for concentrating a polymer / emulsifying surfactant / hydrophobic liquid composition and concentrated polymer / emulsifying surfactant / hydrophobic liquid
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机译:浓缩聚合物/乳化表面活性剂/疏水性液体组合物的方法和浓缩聚合物/乳化表面活性剂/疏水性液体
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摘要
The use of falling-film evaporation and a concentration means such as centrifugal separation to dehydrate and concentrate a water-in-oil polymer emulsion or suspension is disclosed. In a preferred embodiment, a water-in-oil polymer composition containing less than about 25% active polymer solids is dehydrated in falling-film evaporator to produce an evaporator concentrate containing less than about 5.0% water. The evaporator concentrate then flows to a separation device such as a centrifuge, wherein oil is removed to produce a composition that is substantially a polymer and emulsifying surfactant-in-oil composition containing in excess of about 60 weight % polymer solids. The centrifuge raffinate may optionally be treated in a second separation means to capture additional polymer solids, with optional recycle of the oil-rich raffinate. The concentrated polymer composition is preferably stabilized with a steric stabilizer to produce a free flowing liquid product.
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