Preparation method of dihydric alcohol

A dihydric alcohol, mannitol technology, applied in the preparation of organic compounds, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve problems such as expensive nickel/ruthenium catalysts, and achieve small restrictions, low prices, and wide raw material sources. Effect

Inactive Publication Date: 2010-07-21
XIAN MODERN CHEM RES INST
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  • Abstract
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  • Claims
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Problems solved by technology

The raw material used is pure sorbitol aqueous solution, which needs to be obtained by separa

Method used

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  • Preparation method of dihydric alcohol

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Embodiment 1

[0016] A certain amount of sorbitol and mannitol are dissolved in water to prepare an aqueous solution containing 20% ​​by mass of sorbitol and 5% by mass of mannitol. Take 300g of this solution and add it to a 500mL autoclave, add 25g of nickel-molybdenum-copper-chromium catalyst, adjust the pH to 13 with sodium hydroxide, close the autoclave, pressurize the autoclave, vacuumize it after leak testing with nitrogen, and replace it with hydrogen for 3 times , and then heated to raise the temperature. After the reaction temperature rose to 240°C, hydrogen was charged until the reaction pressure was 11MPa to start the catalytic hydrocracking reaction. After 1 hour of reaction, samples were taken and analyzed by high-pressure liquid chromatography. The product composition and distribution were: Alcohol 22.7%, propylene glycol 62%, butanediol 7.8%, other 5.2%, remaining sorbitol and mannitol total 2.3%.

Embodiment 2～ Embodiment 8

[0018] The experimental method is basically the same as in Example 1, except that the catalysts and reaction conditions used are different, and the product distribution also has certain differences, as shown in Table 1.

[0019] Table 1 Reaction conditions and results of Embodiment 2 to Embodiment 8

[0020]

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Abstract

The invention discloses a preparation method of dihydric alcohol, comprising the following step of: carrying out aqueous phase hydrogenolysis to obtain the dihydric alcohol by using hexabasic alcohol as a raw material in the presence of a hydrogenolysis catalyst and at the reaction temperature of 180 DEG C-260 DEG C, the hydrogen pressure of 8 MPa-15 MPa and the pH value of 11-14, wherein the hexabasic alcohol is a mixture of sorbierite and mannite; the weight percentage content of the sorbierite in an aqueous phase is 10-30 percent; the weight percentage content of the mannite is 2-10 percent; the hydrogenolysis catalyst is a nickel-molybdenum-copper catalyst doping chromium, ferrum and stannum or zinc, and the usage amount of the catalyst is 3-10 percent relative to the total weight of the aqueous phase; and the dihydric alcohol comprises ethylene glycol, propylene glycol and butanediol. The invention is mainly used for preparing the dihydric alcohol.

Description

technical field [0001] The present invention relates to a kind of preparation method of dibasic alcohol. Background technique [0002] At present, the industry mainly uses petroleum as raw material to produce glycols, for example, ethylene glycol is produced from ethylene oxide, and propylene glycol is produced from propylene oxide. However, petroleum is a non-renewable resource and is facing an increasingly serious shortage situation, so it is necessary to find a new raw material and new process to produce diols. For example, Chinese patent CN 1683293A discloses a process for the production of dibasic alcohols by cracking sorbitol. In the presence of sodium hydroxide and nickel / ruthenium catalyst, a sorbitol aqueous solution with a mass fraction of 5% to 30% is heated under high temperature and high pressure. Hydrocracking produces ethylene glycol and propylene glycol. The raw material used is pure sorbitol aqueous solution, which needs to be obtained through separation a...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/00B01J23/887B01J23/885
CPCY02P20/52
Inventor 吕剑李春迎郝志军刘波张伟寇联岗马洋博何飞王伟
Owner XIAN MODERN CHEM RES INST
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