Reactor for preparing succinyl oxide by maleic anhydride hydrogenation

Abstract

The invention relates to a reactor for preparing succinyl oxide by maleic anhydride hydrogenation. The invention is characterized in that a trickle bed catalytic reactor is adopted. The trickle bed catalytic reactor is provided with a tower body, a dismountable end socket arranged on the tower body, a hydrogen inlet and a catalyst charging hole which are arranged on the end socket, a distributor arranged at the upper part of the tower body, a maleic anhydride/solvent inlet arranged at the upper part of the distributor, a distribution plate arranged at the lower part of the tower body, a catalyst material layer which is composed of hydrogenation catalyst and is arranged on the distribution plate as well as a catalyst discharging hole and a product outlet which are arranged at the lower part of the tower body. The distributor is in bubble cap type, CZ type, vertical tube type, Technip type, injection type or Venturi type, the distribution plate is in grid type, porous plate type or grid bar type, and aperture ratio is 10-30%. 10 thousand ton class result shows that maleic conversion rate is 100%, selectivity of succinyl oxide is 98%, production efficiency is four times higher than that of stirring kettle reactor, and the service life of catalyst is prolonged by five times.

Description

technical field [0001] The invention belongs to a fixed-bed reactor, in particular to a trickle-bed catalytic reactor for hydrogenating maleic anhydride to produce succinic anhydride. technical background [0002] Succinic anhydride (also known as succinic anhydride) is a raw material for pharmaceutical intermediates, resins, coatings and dyes, usually composed of maleic anhydride (also known as maleic anhydride) and hydrogen (sometimes with solvent), at a certain temperature, It is prepared by chemical reaction with the participation of pressure and catalyst. [0003] Whether the catalyst used in the reaction process is Raney nickel (ZL92103481.4), Ni / Al 2 o 3 -SiO 2 (ZL03122336.2) or Ni / Al 2 o 3 【Journal of Fuel Chemistry, 31(3), 263-266, 2003】, all of which are fed in batches and completed intermittently in an autoclave. The operation steps are complicated, inefficient, difficult to separate the product and the catalyst, and the catalyst life is short; It is not sui...

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Problems solved by technology

[0003] Whether the catalyst used in the reaction process is Raney nickel (ZL92103481.4), Ni / Al 2 o 3 -SiO 2 (ZL03122336.2) or Ni / Al 2 o 3 【Journal of Fuel Chemistry, 31(3), 263-266, 2003】, all of which are fed in batches and completed intermittently in an autoclave. The operation steps are complicated, inefficient, difficult to separate the product and the catalyst, and the catalyst life is short; Not suitable for large tonnage and large-scale production

There is no report on the use of trickle bed for hydrogenation of maleic anhydride to produce succinic anhydride

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