Abstract: Disclosed are a device and a method for producing high-pressure or super high-pressure steam as a byproduct from a maleic anhydride producing device. The device includes a super high-pressure steam drum, a molten salt pump, an oxidation reactor, a regulating valve, molten salt coolers, a switching cooler and a gas cooler. The molten salt pump, the oxidation reactor, the regulating valve and the molten salt coolers are connected. A boiler water buffer device and a boiler water booster pump are arranged between the switching cooler and the gas cooler. The unique design of the boiler water intermediate pressure boosting and the gas cooler in the disclosure makes the gas cooler and the switching cooler very easy to manufacture. Heat can be effectively recovered from process gas to produce high-pressure or super high-pressure steam while accumulation of dust in the process gas is avoided and tar adhesion is easy to clean.

Abstract: The invention discloses a method for direct hydrogenation of maleic anhydride to produce 1,4-butanediol and co-produce succinic anhydride, 1,4-butanediol is obtained by two-step hydrogenation using maleic anhydride and hydrogen as raw materials; the first step of hydrogenation is maleic anhydride hydrogenation reaction, and obtaining ?-butyrolactone and succinic anhydride products by multi-column rectification separation; the second step of hydrogenation is ?-butyrolactone hydrogenation reaction, and obtaining 1,4 butanediol product by rectification separation; specifically includes the following steps: a. hydrogenating maleic anhydride; b. refining the succinic anhydride product; c. hydrogenating ?-butyrolactone; d. refining the 1,4-butanediol product.

Abstract: Disclosed are a device and a method for producing high-pressure or super high-pressure steam as a byproduct from a maleic anhydride producing device. The device includes a super high-pressure steam drum, a molten salt pump, an oxidation reactor, a regulating valve, molten salt coolers, a switching cooler and a gas cooler. The molten salt pump, the oxidation reactor, the regulating valve and the molten salt coolers are connected. A boiler water buffer device and a boiler water booster pump are arranged between the switching cooler and the gas cooler. The unique design of the boiler water intermediate pressure boosting and the gas cooler in the disclosure makes the gas cooler and the switching cooler very easy to manufacture. Heat can be effectively recovered from process gas to produce high-pressure or super high-pressure steam while accumulation of dust in the process gas is avoided and tar adhesion is easy to clean.

Abstract: The invention discloses a method for direct hydrogenation of maleic anhydride to produce 1,4-butanediol and co-produce succinic anhydride, 1,4-butanediol is obtained by two-step hydrogenation using maleic anhydride and hydrogen as raw materials; the first step of hydrogenation is maleic anhydride hydrogenation reaction, and obtaining ?-butyrolactone and succinic anhydride products by multi-column rectification separation; the second step of hydrogenation is ?-butyrolactone hydrogenation reaction, and obtaining 1,4 butanediol product by rectification separation; specifically includes the following steps: a. hydrogenating maleic anhydride; b. refining the succinic anhydride product; c. hydrogenating ?-butyrolactone; d. refining the 1,4-butanediol product.