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Reactor for preparing succinyl oxide by maleic anhydride hydrogenation

A technology for producing succinic anhydride and a reactor, which is applied in the field of trickle bed catalytic reactors and can solve problems such as low efficiency, unsuitability for large tonnage, large-scale production, and difficulty in separating products and catalysts

Inactive Publication Date: 2010-11-24
山西侨友化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Reactor for preparing succinyl oxide by maleic anhydride hydrogenation
  • Reactor for preparing succinyl oxide by maleic anhydride hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The production device with an annual output of 10,000 tons of succinic anhydride is equipped with a trickle bed reactor equipped with a bubble-cap distributor 4 and a grid-type distribution plate 7 with an opening ratio of 15%, and is filled with 3.75 tons of the aforementioned Ni / Al 2 o 3 -SiO 2 Catalyst (made into strips with a diameter of 2mm and a length of 8-12mm), after being reduced with nitrogen and hydrogen containing about 1% hydrogen, the system is replaced with hydrogen, the pressure is increased to 8.0Mpa, and the circulating compressor is started for hydrogen circulation; at the same time, press the solvent The weight ratio of maleic anhydride and maleic anhydride is 4.9:1. Add maleic anhydride into the dissolving tank filled with γ-butyrolactone (used as a solvent), and after it dissolves, it can be transferred to the metering tank; when in the reactor When the temperature of the catalyst material layer 6 drops to 40-50°C, the feed pump can be started to...

Embodiment 2

[0017] In the trickle bed catalytic reactor, a vertical pipe distributor 4 and a grid distribution plate 7 with a 30% opening ratio are configured, and the remaining operation steps and indicators are the same as in Example 1, and the same effect can be obtained.

Embodiment 3

[0019] In the trickle-bed catalytic reactor, a CZ type distributor 4 and a porous plate type distribution plate 7 with a 5% opening ratio are configured, and the aforementioned granular Raney nickel catalyst is filled, and the remaining operation steps and indicators are the same as in Example 1, and can be obtained Same effect.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/02C07C51/56C07C55/10
Inventor 黄哲白玉祥宋旗跃袁鉴清石俊来张顺义张承华石瑛王忠义孙慧玲
Owner 山西侨友化工股份有限公司
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