Hydrogenation of dicyanobutene (DNB) to adiponitrile with 0. 2% palladium on charcoal

Journal Article · Fri Sep 01 00:00:00 EDT 1978 · Ind. Eng. Chem., Prod. Res. Dev.; (United States)

DOI:https://doi.org/10.1021/i360067a010· OSTI ID:6856149

Stimek, R T ^[1]; Rase, H F

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1. Univ. Texas, Austin

The hydrogenation of dicyanobutene (DNB) to diponitrile with (0.2Vertical Bar3<) palladium on charcoal as catalyst was carried out in a 1 in. dia stainless steel reactor at 325/sup 0/-330/sup 0/C, 40 psig 13.5 std cu ft/hr hydrogen flow, 3 std cu ft/hr nitrogen flow, and 60 ml/hr DNB flow to determine the catalyst deactivation characteristics. Results showed that the catalyst is reversibly poisoned by hydrogen sulfide generated from the charcoal itself, deactivated by a nitrogenous coke formed from the DNB, and deactivated by sintering. The coke deposit and the hydrogen sulfide accelerated sintering. A method for removing coke at low temperature (Vertical Bar3; 450/sup 0/C) to avoid sintering was developed; it involved reaction with steam in hydrogen. In the presence of palladium, the CO formed by this reaction would ultimately be converted to carbon dioxide as the gas was recycled. Currently accepted hypotheses and theories on deactivating along with X-ray; ESCA, and electron microscopy aided in analyzing the complex and interacting deactivation patterns. Hydrogenation of DNB is the last step in the preparation of adiponitrile from butadiene.

• OSTI ID: 6856149
• Journal Information: Ind. Eng. Chem., Prod. Res. Dev.; (United States), Journal Name: Ind. Eng. Chem., Prod. Res. Dev.; (United States) Vol. 17:3; ISSN IEPRA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical &amp; Physicochemical Properties
400301* -- Organic Chemistry-- Chemical &amp; Physicochemical Properties-- (-1987)
ADSORBENTS
ALKENES
CATALYSTS
CHARCOAL
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DEACTIVATION
ELEMENTS
HIGH TEMPERATURE
HYDROCARBONS
HYDROGENATION
MEDIUM PRESSURE
METALS
NITRILES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
TRANSITION ELEMENTS