Continuous production process for preparing succinyl oxide by maleic anhydride hydrogenation

A production process and a technology for producing succinic anhydride, which is applied in the field of continuous production technology for hydrogenating maleic anhydride to produce succinic anhydride, can solve the problems of complicated operation steps, short catalyst life, difficult separation of products and catalysts, etc.

Active 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

Method used

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  • Continuous production process for preparing succinyl oxide by maleic anhydride hydrogenation
  • Continuous production process for preparing succinyl oxide by maleic anhydride hydrogenation

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Experimental program
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Effect test

Embodiment 1

[0021] A production plant with an annual output of 10,000 tons of succinic anhydride, with 3.75 tons of the aforementioned Ni / Al in the trickle bed reactor 5 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 with maleic anhydride is 4.9: 1 proportioning, maleic anhydride is added in the dissolving tank 1 that fills gamma-butyrolactone (used as a solvent), and after it dissolves, it can be transferred to metering tank 2; When the catalyst bed temperature of the reactor drops to 40-50°C, the metering pump 3 can be started to feed the reactor; at this time, the molar ratio of hydrogen and maleic anhydride entering the reactor must be adjusted synchronously according to the ...

Embodiment 2

[0023] When using granular Ni / Al 2 o 3 Catalyst, and no solvent is used, the dissolution tank becomes a melting tank (maintained at 53-60 ° C), the maleic anhydride is melted here, and after melting, it is fed into the metering tank, and the maleic anhydride is fed separately (that is, the weight ratio of solvent to maleic anhydride is 0:1 ); This time, the molar ratio of hydrogen and maleic anhydride that needs to be adjusted into the trickle bed reactor 5 is 92: 1 in addition, and the preheating temperature before the trickle bed reactor 5 should be controlled at 53-55 ℃, and the reactant is Liquid separator 6, the separated liquid phase product (crude product succinic anhydride) goes to distillation tower 7, obtains the succinic anhydride product with purity greater than 99.5% through distillation, and the separated hydrogen enters 9 pressurizations of circulating compressor after cooling, and the rest Operation steps and index are the same as embodiment 1, can obtain same...

Embodiment 3

[0025] When using granular aforementioned Raney nickel catalyst instead, dioxane is solvent, and the weight ratio of solvent and maleic anhydride is 15: 1, and the mol ratio of the hydrogen that enters trickle-bed reactor 5 and maleic anhydride is 1.1: 1, All the other operation steps and index are the same as embodiment 1, also can obtain same effect.

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Abstract

The invention relates to a continuous production process for preparing succinyl oxide by maleic anhydride hydrogenation, including the following steps: (1) maleic anhydride and solvent are dissolved in a dissolution tank, and preheating is carried out by virtue of a maleic anhydride heater; (2) maleic anhydride after preheating is mixed with hydrogen preheated by a hydrogen preheater, the mixture enters into a trickle bed reactor filled with hydrogenation catalyst, and maleic anhydride hydrogenation reaction is carried out; (3) reaction product and residual hydrogen pass through a gas-liquid separator, separated liquid phase product is conveyed into a distillation tower, and distillation is carried out, thus obtaining the finished product succinyl oxide; (4) solvent separated by the distillation tower is recycled; (5) the residual hydrogen separated by the gas-liquid separator is returned to the hydrogen preheater again. Result shows that maleic anhydride conversion rate is 100%, selectivity of product succinyl oxide is more than 98%, the production efficiency of continuous production process is four times higher than that of batch stirring kettle process, and the service life of catalyst is prolonged by more than five times.

Description

technical field [0001] The invention relates to a continuous production process for preparing succinic anhydride by hydrogenating maleic anhydride. Background technique [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 suitable for large-tonnage and large-sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/60B01J8/02
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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