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Dimethyl maleate hydrogenating catalyst and preparation method thereof

A technology of dimethyl maleate and hydrogenation catalyst, which is applied in the field of dimethyl maleate hydrogenation catalyst and its preparation, can solve the problems of short service life of catalyst, increase of production cost, influence of production efficiency, etc., and achieve high The effect of activity, improving service life, and suppressing side reactions

Active Publication Date: 2015-05-27
NANTONG FINC PHARMA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned patented technologies all have the shortcoming that the service life of the catalyst is short, and after coke is accumulated on the surface of the catalyst, the catalyst will quickly deactivate. Frequent replacement of the catalyst will affect the production efficiency and increase the production cost. Therefore, how to prolong the service life has become an urgent need to be solved. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of fluorine-modified Ni-containing hydrotalcites is as follows (refer to the literature: Zhang Jun et al. "A study on the application of fluorine-modified Ni-containing hydrotalcites in the partial oxidation of methane to synthesis gas [J]. Journal of Fuel Chemistry, 2012, 40 (4):424-429):

[0027] With Ni(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O, and Al(NO 3 ) 3 9H 2 O as raw material, choose NaOH and NaCO 3 In order to comply with the precipitating agent, the ternary Ni / Mg / Al hydrotalcite was prepared by co-precipitation method, and then calcined for 4 hours under the air atmosphere of 723K to obtain the corresponding composite oxide, and then the composite oxide was impregnated in the containing F- solution, using the "memory effect" of hydrotalcite to introduce F- into the interlayer of hydrotalcite, that is, to obtain F-modified Ni-Mg-Al hydrotalcite (HTL-F), as the raw material of the following examples, which The diameter of the ball...

Embodiment 2

[0034] The amount of palladium nitrate added in step 1) was changed to account for 0.5% of the mass of the fluorine-modified Ni-containing hydrotalcite, and the others were the same as in Example 1. The resulting product number was M-2.

Embodiment 3

[0036] The amount of palladium nitrate added in step 1) was changed to account for 5% of the mass of the fluorine-modified Ni-containing hydrotalcite, and the others were the same as in Example 1. The resulting product number was M-3.

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Abstract

The invention provides a dimethyl maleate hydrogenating catalyst. The dimethyl maleate hydrogenating catalyst is prepared by the following steps: firstly, by using fluorine-modified Ni-containing hydrotalcite with a microporous structure as a carrier, loading palladium nitrate by a liquid phase deposition method; secondly, loading MoO3; and finally, washing, drying, and roasting. The dimethyl maleate hydrogenating catalyst can still keep relatively high activity after operation for a long time, has a longer service life in a dimethyl maleate hydrogenating reaction for preparing dimethyl succinate 3 times as that of an ordinary carbon palladium catalyst, and can be used for 100 days to the maximum. The invention further provides a preparation method of the dimethyl maleate hydrogenating catalyst.

Description

technical field [0001] The invention relates to a hydrogenation catalyst and a preparation method thereof, in particular to a dimethyl maleate hydrogenation catalyst and a preparation method thereof. Background technique [0002] Dimethyl succinate is an important synthetic flavor and food additive, and can be used as a food preservative. DMSS is an intermediate of high-grade organic pigment chiaacridone. At present, dimethyl succinate is mainly obtained from succinic acid and methanol through esterification with concentrated sulfuric acid as a catalyst. However, this kind of esterification is catalyzed by concentrated sulfuric acid. The process has many side reactions, low yield, complex post-treatment, severe equipment corrosion, and highly toxic dimethyl sulfate as a by-product, which seriously pollutes the environment. The latest process of dimethyl succinate is obtained by hydrogenation reaction using dimethyl maleate and hydrogen as raw materials and using palladium c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/132C07C69/40C07C67/303
Inventor 王琪宇王新
Owner NANTONG FINC PHARMA CHEM