Process for the production of maleic anhydride

Patent · Tue Jun 24 04:00:00 EDT 1986

OSTI ID:5585341

Click, G T; Barone, B J

A process is described for the vapor phase oxidation of hydrocarbons having 4 carbon atoms to produce maleic anhydride comprising contacting the hydrocarbons with a fixed bed vanadium-phosphorus-oxygen catalyst, containing P:V in an atomic ration of 1/2 to 3:1 whereby the catalyst gradually decreases in selectivity, wherein the improvement comprises contacting the catalyst with phosphorus compound of phosphorus halide, phosphorus oxyhalide, organic phospines, organic phosphites, organic phosphates or mixtures thereof at a temperature in the range of about 0/sup 0/ to 600/sup 0/C and thereafter contacting the catalyst with a flow of stream at a temperature in the range of 300/sup 0/ to 600/sup 0/C in an amount and for a sufficient duration whereby the catalyst is regenerated.

• Assignee: Denka Chemical Corp., Houston, TX
• Patent Number(s): US 4596878
• OSTI ID: 5585341
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ANHYDRIDES
CARBOXYLIC ACIDS
CATALYSTS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
DICARBOXYLIC ACIDS
FLUIDS
GASES
HIGH TEMPERATURE
HYDROCARBONS
MALEIC ACID
MEDIUM TEMPERATURE
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PACKED BED
PHOSPHORUS COMPOUNDS
QUANTITY RATIO
REGENERATION
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VAPORS