Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for synthesizing decalin

A synthesis method, decahydronaphthalene technology, applied in chemical instruments and methods, hydrogenation hydrocarbon production, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of high price and difficulty, achieve low metal content, The effect of high naphthalene conversion

Inactive Publication Date: 2012-09-26
XIAMEN UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Noble metal catalysts have very high hydrogenation activity and can usually deeply hydrogenate naphthalene, but they are expensive; non-noble metal catalysts such as nickel can easily hydrogenate naphthalene to tetrahydronaphthalene, but it is difficult to continue hydrogenation of tetrahydronaphthalene to decahydronaphthalene

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] After the nickel acetate is fully dissolved in water, add γ-Al according to the metal content of 4% 2 O 3 After 5h, pour out the clear liquid and dry at 150℃ for 8h to obtain the catalyst precursor; reduce the catalyst precursor at 450℃ for 4h at a hydrogen flow rate of 30mL / min to obtain Ni / γ-Al with a nickel content of 4% 2 O 3 For the catalyst, the diameter of nickel metal particles is about 2 to 3 nm. Ni / γ-Al 2 O 3 The catalyst is reserved under the protection of reducing gas. Add 40 mL of a solution with a mass concentration ratio of naphthalene to solvent cyclohexane of 0.09 and 1.5 g of a catalyst with a nickel content of 4% into a 0.1L high-pressure stirred reactor. The reaction temperature is 180°C, the reaction pressure is 4MPa, and the stirring speed is 750rpm. Down, the liquid mass space velocity is 11.0h -1 , Reaction for 2h. The conversion rate of naphthalene hydrogenation reaction reaches 100%, and the yield of decalin reaches 99%.

Embodiment 2

[0025] The preparation of the catalyst is the same as in Example 1. In a 0.1L high-pressure stirred reactor, add 40 mL of a solution with a mass concentration ratio of naphthalene to solvent cyclohexane of 0.14 and 1.5 g of a catalyst with a nickel content of 4%, at a reaction temperature of 180°C, a reaction pressure of 4 MPa, and a stirring speed of 750 rpm. The liquid mass space velocity is 9.5h -1 ,Reaction 2.5h. The conversion rate of naphthalene hydrogenation reaction reaches 100%, and the yield of decalin reaches 99%.

Embodiment 3

[0027] The preparation of the catalyst is the same as in Example 1. In a 0.1L high-pressure stirred reactor, add 40 mL of a solution with a mass concentration ratio of naphthalene to solvent cyclohexane of 0.09 and 1.5 g of a catalyst with a nickel content of 6.5%. The reaction temperature is 150°C, the reaction pressure is 3MPa, and the stirring speed is 650rpm. Down, the liquid mass space velocity is 11.0h -1 , Reaction for 2h. The conversion rate of naphthalene hydrogenation reaction reaches 100%, and the yield of decalin reaches 98%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a method for synthesizing decalin, and relates to a method for synthesizing a compound. The invention provides the method for synthesizing the decalin from naphthalene in one step by using a load type catalyst taking nano metal with low content and small size as an active phase and under the conditions of low reaction temperature and pressure. The method comprises the following steps of: mixing the naphthalene and cyclohexane, and placing the mixture in a high pressure autoclave; adding a catalyst in the high pressure autoclave; and discharging air in the high pressure autoclave, stabilizing the pressure of hydrogen gas in the high pressure autoclave to between 2 and 5MPa for reaction, and obtaining the decalin. The conversion rate of the naphthalene is 100 percent, and the maximum yield of the decalin is 99 percent. The method for preparing the catalyst of Ni / gamma-Al2O3 comprises the following steps of: dissolving metallic salt of nickel in water, adding gamma-Al2O3 in the mixed solution, pouring clear solution out, and drying the clear solution to obtain a precursor of the catalyst; and reducing the precursor of the catalyst.

Description

Technical field [0001] The invention relates to a compound synthesis method. Background technique [0002] Decahydronaphthalene is a suitable solvent for the "dry spinning process" of ultra-high molecular weight polyethylene. In addition to being used as a solvent, it can also be used as the best dehydrogenation and cracking "endothermic fuel" for hypersonic aircraft and as a fuel cell for automobiles Excellent hydrogen storage media. Some foreign companies have produced decalin products, such as Chemos GmbH in Europe, Afflliated Company (DegussaAG) in Germany, DuPont in the United States, Dow Chemical Ltd, Sigma-AldriCh, etc., which are expensive. [0003] At present, the catalysts used for the hydrogenation of naphthalene to synthesize decalin mainly include nickel, molybdenum, tungsten, palladium, platinum, rhodium, ruthenium and iridium. Noble metal catalysts have very high hydrogenation activity and can usually be used for deep naphthalene hydrogenation, but they are expensi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C13/50C07C5/10B01J23/755B01J37/18
Inventor 方维平李枫伊晓东郑进保王跃敏
Owner XIAMEN UNIV