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US3932504A
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Urea manufacture
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US3539627A
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Process for production of urea
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US3442770A
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Process for the purification of methanol by extractive distillation and plural stage distillation recovery
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US3480407A
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Multiple zone apparatus for the processing of fluids having interzone fluid mixing and redistribution features
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US3110646A
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Centrifugal film evaporating apparatus and method
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ES249808A1
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Procedure for obtaining urea (Machine-translation by Google Translate, not legally binding)
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GB926781A
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Dehydration of urea melts
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US2939771A
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Contact apparatus including sealing means
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US2999008A
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Purification of carbon dioxide for urea synthesis
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US3055745A
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Catalytic reactor
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