Effect of water in the formation of the carbamide-paraffin complex

Journal Article · Sun Apr 10 04:00:00 EST 1983 · J. Appl. Chem. USSR (Engl. Transl.); (United States)

OSTI ID:7127044

Ivanov, B N

Carbamide deparaffination, which is one of the main industrial methods for producing liquid paraffins and low-congealing diesel fuels, is carried out expeditiously with crystalline carbamide in the presence of an activator-solvent (AS). As a rule, AS are organic compounds of low water content that have an active functional group and are disposed to charge transfer. Water, which must be present for efficient complex formation, intensifies the activator effect only up to a definite limit. In the literature the problem of the water effect has been interpreted mainly from the viewpoint of elucidating its influence on the yield and quantity of carbamide deparaffination products without regard for the nature of the effect. It has been shown that water increases the dipole moment in the reaction system, increases the intermolecular interaction of AS with carbamide, and favors a decrease in crystal size. In the present work the effect of water on carbamide has been defined more accurately; carbamide-water systems (mainly suspensions) have been investigated by proton magnetic resonance (PMR), nuclear quadrupole resonance (NQR), x-ray diffraction, and photomicrography, In the amounts used in the deparaffination of petroleum products with carbamide, water practically does not change the crystal system of carbamide, although there is limited deformation.

• Research Organization: S.M. Kirov Kazan Chemical-Engineering Inst., USSR
• OSTI ID: 7127044
• Journal Information: J. Appl. Chem. USSR (Engl. Transl.); (United States), Journal Name: J. Appl. Chem. USSR (Engl. Transl.); (United States) Vol. 55:10; ISSN JAPUA
• Country of Publication: United States
• Language: English

Related Subjects

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020400* -- Petroleum-- Processing
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10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
AMIDES
CARBONIC ACID DERIVATIVES
CHEMICAL REACTIONS
DEWAXING
DIESEL FUELS
HYDROCARBONS
HYDROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
SEPARATION PROCESSES
SYNTHESIS
UREA
WATER