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Method for preparing succinate

A technology for succinic acid dicarboxylate and maleic acid dicarboxylate, which is applied in the field of preparing succinic acid dicarboxylate, can solve the problems of easy deactivation, short life, poor catalyst stability, etc. High activity and selectivity, the effect of improving the service life

Active Publication Date: 2011-04-06
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN101747189A, CN101745396A have announced the technique and the catalyzer of preparing dialkyl succinate with dialkyl maleate hydrogenation, but it is directly with dialkyl maleate raw material, without diluent, and dialkyl maleate Hydrogenation of alkyl esters is a strong exothermic reaction, which is easy to cause overheating, and the copper-zinc catalyst used in it has poor thermal shock performance, especially for strong exothermic reactions such as hydrogenation of carbon-carbon double bonds, the stability of the catalyst is poor Poor, short life, easy to deactivate, and copper-based catalyst as the most commonly used carbonyl hydrogenation catalyst, it is easy to generate 1,4-butanediol, γ-butyrolactone, tetrahydrofuran and other by-products, hydrogenation products need Separation and purification to obtain qualified products

Method used

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  • Method for preparing succinate
  • Method for preparing succinate
  • Method for preparing succinate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Pass dimethyl maleate into a solution filled with 5% Ni-0.05% K 2 O / Al 2 o 3 In the fixed bed reactor, the reaction pressure is 5MPa, the temperature is 50°C, and the space velocity is 0.2h -1 , the molar ratio of hydrogen to dicarboxylate maleate is 20, the volume ratio of dimethyl succinate to dimethyl maleate is 0.5:1, after 1000h stability experiment, the results are shown in Table 1 .

Embodiment 2

[0021] Pass diethyl maleate into the 15% Ni-8% MnO 2 / SiO 2 In the fixed bed reactor, the reaction pressure is 0.1MPa, the temperature is 200°C, and the space velocity is 5h -1 , the molar ratio of hydrogen to maleic acid dicarboxylate is 500, and the volume ratio of circulating diethyl succinate to diethyl maleate is 4:1. After 1000h stability experiment, the results are shown in Table 1.

Embodiment 3

[0023] Pass diisopropyl maleate into a fixed-bed reactor filled with 30% Ni-2% MgO / AC, the reaction pressure is 1MPa, the temperature is 120°C, and the space velocity is 0.5h -1 , the molar ratio of hydrogen to maleic acid dicarboxylate is 50, and the volume ratio of circulating diisopropyl succinate to diisopropyl maleate is 1:1. After 1000h stability experiment, the results are shown in Table 1 .

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Abstract

The invention discloses a method for preparing succinate. The method comprises the following steps of: mixing hydrogen and maleic acid ester, and performing hydrogenation with a fixed bed reactor filled with a hydrogenation catalyst to obtain the succinate; and partially circulating the generated succinate, mixing with the maleic acid ester to obtain raw materials, and feeding a product subjectedto hydrogenation into a gas-liquid separator to obtain succinate with content of over 99.6 percent, wherein the separated hydrogen can be recycled. The method has the advantages that: raw materials are diluted in a reaction product circulation mode, so that temperature runaway caused by hydrogenation heat release can be effectively avoided, by-products of the reaction is very few, and the servicelife of the catalyst is prolonged and the stability of the catalyst is improved.

Description

technical field [0001] The invention belongs to a method for preparing succinic acid dicarboxylate, in particular to a method for hydrogenating maleic acid dicarboxylate to produce succinic acid dicarboxylate. technical background [0002] Succinic acid dicarboxylate is an important synthetic spice, food additive, organic solvent, and also an intermediate in organic synthesis and pharmaceutical synthesis. It is widely used in food, spice, daily chemical, pharmaceutical, coating, rubber, plastic and other industries . Especially in recent years, due to the enhanced awareness of environmental protection, green environmental protection products are favored by people. Environmentally friendly coatings with succinic acid dicarboxylate as solvent and pigments (such as quinacridone pigments) prepared with it as intermediates ), will have a broad market prospect, which will drive the demand for succinic acid dicarboxylate. [0003] At present, the preparation method of succinic ac...

Claims

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Application Information

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IPC IPC(8): C07C69/40C07C67/303
Inventor 李学宽唐明兴吕占军齐永琴周立功杜明仙葛晖
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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