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Catalyst for preparing isoamyl acetate and preparation method thereof

A technology of isoamyl acetate and catalyst, applied in the field of catalyst for synthesizing isoamyl acetate, can solve problems such as inability to meet industrialized production, increased processing difficulty, corrosive equipment, etc., and achieves broad industrial application prospects, good catalytic activity, The effect of quality improvement

Inactive Publication Date: 2005-03-16
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The catalysts disclosed in the above-mentioned documents all have defects such as unstable properties, poisonous or slightly toxic, difficult to be used in the synthesis of food isoamyl acetate, soluble in water to increase the difficulty of post-treatment, and corrosive to equipment, so they cannot meet the requirements of industrialization. production needs

Method used

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  • Catalyst for preparing isoamyl acetate and preparation method thereof
  • Catalyst for preparing isoamyl acetate and preparation method thereof
  • Catalyst for preparing isoamyl acetate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0021] According to the molar ratio RE / IMP=1:1, weigh a certain amount of La(NO 3 ) 3 ·6H 2 O(I) and inosinic acid sodium salt Na 2 IMP·7(H 2 O) 3 (II); Dissolve (I) in distilled water (III), control the pH at 4-5 to make it completely dissolved; (II) dissolve in appropriate amount of distilled water (IV), drop (III) into (IV); stir evenly , to obtain flocculent precipitate (V); wash (V) 3 times with ethanol-distilled water mixed solvent; evaporate to dryness, put in a constant temperature drying oven and dry to constant weight, that is, the catalyst, the solid powder of La-IMP.

[0022] In the same way, use Ce(NO 3 ) 3 ·6H 2 O and inosinic acid sodium salt, Nd(NO 3 ) 3 ·6H 2 O and inosinic acid sodium salt are obtained as solid powders of said catalysts Ce-IMP and Nd-IMP.

Embodiment 4～6

[0024] According to the molar ratio RE / IMP=1:1, weigh a certain amount of single rare earth oxide Sm 2 o 3 、Eu 2 o 3 、Gd 2 o 3 , drop an appropriate amount of nitric acid to convert the rare earth oxide into nitrate, dissolve in distilled water, control its pH at 4 to 5, and make it completely dissolve (I). Dissolve inosinic acid sodium salt in an appropriate amount of distilled water (II), drop (I) into (II); stir evenly to obtain flocculent precipitate (III); wash (III) 3 times with ethanol-distilled water mixed solvent; evaporate to dryness , placed in a constant temperature drying box and dried to constant weight, that is, to obtain the catalyst, Sm-IMP, Eu-IMP, Gd-IMP solid powder.

Embodiment 7

[0026] Solubility of solid catalyst:

[0027] The products are all in the form of solid powder, and their product properties and solubility are shown in Table 1.

[0028] Table 1 Basic product characteristics

[0029] Example Complex name Color Solubility

[0030] 1 La-IMP White solid Insoluble in water, chloroform,

[0031] 2 Ce-IMP White solid Acetone, n-butanol, ethyl acetate,

[0032] 3 Nd-IMP Purple solid Toluene, benzene, ethanol, isoamyl alcohol,

[0033] 4 Sm-IMP White solid Acetic acid, N,N-dimethylformamide

[0034] 5 Eu-IMP white solid

[0035] Soluble in DMSO

[0036] 6 Gd-IMP white solid

[0037] Rare Earth Element Analysis:

[0038] The rare earth element analysis of the catalyst was titrated by EDTA method. Xylenol orange was used as indicator, and hexamethylenetetramine was used as buffer medium. The results are shown in Table 2:

[0039] Determination of rare earth ion cont...

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Abstract

The invention relates to a kind of catalyst for manufacturing acetic acid isovaleric ester and its manufacturing method. Make the rare earth nitrate react with inosinic acid sodium salt directly in the ordinary temperature, and get the flocculent deposit; then with the ordinary purification, the catalyst can be acquired. Through the method of this invention to manufacture acetic acid isovaleric ester, the production is clean and the ability of it has the obvious improvement; moreover, the production can be separated easily, and has no corrosion to the equipment and no pollution to environment; the catalyst has the advantages of the simple manufacturing and the stable quality. The conversion rate of acetic acid can be up to more than 99.87%, so it shows the excellent catalytic activity, and it is a solid catalyst that is benefit for environment with the wide industrial application prospect. The catalyst of the invention is the solid complex of the light rare earth and the biological activity ligand 5-IMP, the structure general formula: RE-LMP.

Description

technical field [0001] The invention relates to a catalyst for synthesizing isoamyl acetate. Background technique [0002] Isoamyl acetate is a colorless liquid with aromas of banana, pear, apple, etc. It can be used as a food spice. China GB2760-86 is allowed to be eaten, the US FEMA number is 2055, and the US FDA is approved for food. Usually it is prepared by direct esterification under the azeotropic state from isoamyl alcohol and acetic acid under the catalysis of concentrated sulfuric acid. [0003] Sulfuric acid is used for catalysis, although the activity is high and the price is low, but the selectivity is poor, the product quality is not good, the equipment is seriously corroded, and a large amount of waste liquid is produced at the same time, which pollutes the environment. At present, scientists have done a lot of work to find alternatives to concentrated sulfuric acid. The synthetic catalysts of isoamyl acetate are mostly concentrated in sodium bisulfate, ion ...

Claims

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Application Information

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IPC IPC(8): B01J31/22C07C69/14C07H19/20
Inventor 陈燕青张燕
Owner SHANGHAI UNIV OF ENG SCI