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Method for preparing n-propanol from bio-base diol

A bio-based diol, n-propanol technology, applied in the chemical industry, can solve the problems of difficult product separation, long reaction time, complex catalyst preparation process, etc., and achieve the effect of easy reaction operation

Active Publication Date: 2014-07-23
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there are also reports on the preparation of n-propanol by hydrogenation (Adv.Synth.Catal.2009, 351:789-800, ChemSusChem.2010(3):728-736), but there are certain defects in the above hydrogenation method , the former uses a homogeneous noble metal catalyst, the preparation process of the catalyst is complicated, and the separation of the catalyst and the reactant is difficult; although the latter uses a heterogeneous catalyst, the catalyst is also a noble metal (Rh-Re / SiO 2 ), and requires high hydrogen pressure (8MPa), and the reaction time is too long (24-48h)

Method used

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Effect test

Embodiment 1

[0017] The preparation process of catalyst A is as follows: with the dried γ-Al 2 o 3 As a carrier, add a certain amount of ammonium metatungstate solution (the mass of W contained in ammonium metatungstate is about 30% of the carrier) by equal volume impregnation method, impregnate for 24 hours, transfer to an oven at 110°C for 24 hours, and dry at 600°C Catalyst samples were prepared after calcination for 4 h.

Embodiment 2

[0019] The preparation process of catalyst B is as follows: with the ZrO after drying 2 As a carrier, add a certain amount of ammonium metatungstate solution (the mass of W contained in ammonium metatungstate is about 30% of the carrier) by equal volume impregnation method, impregnate for 24 hours, transfer to an oven at 110°C for 24 hours, and dry at 600°C Catalyst samples were prepared after calcination for 4 h.

Embodiment 3

[0021] The preparation process of catalyst C is as follows: Adopt co-precipitation method to prepare Zr(OH) 4 ·xH 2 O, with dried Zr(OH) 4 ·xH 2 O was used as a carrier, and a certain amount of niobium oxalate solution (adjusted to pH ≤ 1 with nitric acid) was added by equal volume impregnation method, impregnated for 24 h, transferred to an oven at 110 °C for 24 h, and calcined at 600 °C for 4 h to prepare catalyst samples. (The mass of Nb contained in niobium oxalate solution is about 1.6% of the support).

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Abstract

The present invention belongs to the technical field of chemical industry, and specifically to a method for preparing n-propanol from a bio-base diol. According to the method, a glycerol hydrogenolysis product 1,2-propylene glycol and a catalyst prepared by loading a transition metal element on a carrier are subjected to a continuous reaction of high temperature dehydration and hydrogen transfer coupling on a fixed bed reactor under atmospheric pressure nitrogen protection to prepare the n-propanol. With application of the catalyst of the present invention in preparation of n-propanol from 1,2-propylene glycol through the dehydration continuity reaction, the single-process conversion rate is more than 86%, and the selectivity of the n-propanol in the product is more than 45%.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing n-propanol from bio-based dihydric alcohol. Background technique [0002] In recent years, due to the renewable and green nature of bioenergy, bioenergy has received special attention, and it is considered to be one of the most ideal ways to solve the energy crisis. At present, countries around the world are vigorously developing bio-energy, including bio-diesel technology and bio-petroleum technology. At the same time, the rapidly rising investment in biodiesel has created a surplus of glycerol, a by-product of the production process. In the production of biodiesel such as fatty acid methyl ester, glycerol is produced in large quantities as a by-product in the transesterification reaction, and 1 kg of crude glycerin is produced for every 9 kg of biofuel produced. Therefore, finding new utilization routes for these glycerols has attr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/10C07C29/60B01J23/30B01J23/20
Inventor 牟新东彭功名王喜成姜义军郭新翠徐国强王晓燕
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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