The production processes of 1,4-butanediol include acetylene-formaldehyde process,butadiene-acetoxylation process,propylene epoxide process and cis-butenedioic anhydride process.

Study of modified VPO catalysts on the selective oxidation of n-butane to maleic anhydride;

Selective hydrogenation of maleic anhydride to tetrahydrofuran in toluene/acidic ionic liquid biphase catalytic system;

Gas-phase hydrogenation of maleic anhydride to γ-butyrolactone over Cu-Zn-Ti catalysts;

Through repairing the fixed bed calandria reactor during the molten salt leakage test in 2×104 t/a cis-butenedioic anhydride unit in Lanzhou Petroleum and Chemical Corporation,a pack of reasonable,practical and feasible technologic means was found to confirm the leakage points caused by molten salt and to repair it in reactor.

SBS and its epoxidation and maleation;

The results showed that MAH/SBS/benzoyl peroxide(BPO)(mass ratio) 30/100/1,concentration of SBS 10 g/mL,droping time of BPO/toluene 10 min,temperature 75 ℃,and reaction time 4 h were the optimum conditions for maleation.

A large amount of waste gas containing un-reacted raw material,by-product carbonic oxide and volatile organic compounds is discharged in the course of maleic anhydride production,so it is crucial to treat the waste gas and change the harmful matter to harmless matter and release it according with the standard.

The semi-ester of maleic anhydride-rosin adduct with high acid value was obtained by adduction of maleic anhydride with rosin and esterification with pentaerythritol.