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Double-layer combined catalyst for preparing normal propyl alcohol by glycerine hydrogenation

A technology of combining catalyst and n-propanol, applied in molecular sieve catalyst, physical/chemical process catalyst, organic chemistry, etc., can solve the problems of high price, difficult to obtain, sudden drop, etc., and achieve flexible selection, obvious cost advantage, and easy control. Effect

Inactive Publication Date: 2015-05-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its shortcoming is expensive, can't obtain higher n-propanol yield under the condition of high liquid space velocity (or mass velocity) simultaneously
With Pt-HSiW / ZrO 2 Catalyst as an example, although the catalyst can obtain more than 80% n-propanol yield under certain process conditions, the liquid space velocity is only 0.045h under this condition -1 ; However, increase the airspeed to 0.18h -1 , the yield of glycerol dropped to 20%
The inability to obtain high propanol yields at high space velocity (or mass velocity) also significantly limits its application value
[0010] It is usually difficult to obtain a higher yield of n-propanol using non-precious metal catalysts

Method used

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  • Double-layer combined catalyst for preparing normal propyl alcohol by glycerine hydrogenation
  • Double-layer combined catalyst for preparing normal propyl alcohol by glycerine hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Firstly, β molecular sieve with Si / Al ratio of 15 and 0.2mol / L NH 4 NO 3 The aqueous solution is subjected to ion exchange three times according to the method of step (1) to obtain an acidic β molecular sieve (Hβ). With Ni(NO 3 ) 2 as Ni source, porous Al 2 o 3 Prepare Al for the carrier according to the method of step (2) 2 o 3 Supported Ni catalyst (Ni / Al 2 o 3 ). The above two catalytic materials are sieved to retain the 30-80 mesh part. In a stainless steel fixed-bed reactor with an inner diameter of 5 mm, the above two catalytic materials were filled in two layers to obtain a catalyst combination. In this combination, the Hβ layer is in Ni / Al 2 o 3 Upstream of the layer, the two weighed 0.6 g and 1.2 g, respectively.

[0042] The technological condition of glycerol hydrogenation reaction is: reactant is the glycerol aqueous solution of 25% (volume ratio) that flow velocity is 0.2mL / min and the H that flow velocity is 100mL / min 2 ; After the flow rate ...

Embodiment 2

[0045] The method is the same as in Example 1, except that the amount of Hβ used is changed to 1 g. The conversion rate of glycerol obtained in Example 2 was 100%, and the yield of n-propanol was 72%.

Embodiment 3

[0047] The method is the same as in Example 2, except that the β molecular sieve is changed to ZSM-5 molecular sieve. The conversion rate of glycerol obtained in Example 3 was 77%, and the yield of n-propanol was 52%.

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Abstract

The invention provides a double-layer combined catalyst for preparing normal propyl alcohol by glycerine hydrogenation. According to the combined catalyst, a microporous molecular sieve and a supported nickel catalyst are filled layer by layer and combined to use; a weight ratio of usage amount of the microporous molecular sieve to the supported nickel catalyst is (1:20)-(15:1); the catalyst combination is applied to a fixed bed reactor; a good yield of normal propyl alcohol can be acquired by taking hydrogen and a glycerine aqueous solution as raw materials; the catalyst combination is low in cost, the raw materials are easily available and the preparation process is friendly to the environment. Compared with the catalyst comprising noble metals including Pt, Ru, Rh, Ir, Re and the like, the catalyst material has the obvious cost advantages; as the catalyst consumption in the industrial application is huge, the cost advantage of the double-layer combined catalyst is prominent; compared with a monolayer catalyst comprising noble metals including Ni, Cu and the like, a prominently-improved yield of the normal propyl alcohol can be obtained due to the adoption of the double-layer combinatorial catalyst.

Description

technical field [0001] The invention relates to the technical field of industrial hydrogenation catalysis, in particular to a double-layer packed catalyst combination used in the preparation of n-propanol (Eq.1) from glycerol hydrogenation in a fixed-bed reactor. [0002] Background technique [0003] Biodiesel is the product of the transesterification reaction of oil and methanol. Another product of this reaction is glycerol. Therefore, with the development of biodiesel production capacity, how to use glycerol to produce high-value chemical products has become one of the key factors to enhance the competitiveness of biodiesel industry, and it is also one of the research hotspots in the field of new energy production. Hydrogenation of glycerol to remove part of the oxygen components in its molecule to produce chemical products such as propanol and dipropanol is one of the important ways to utilize glycerin. The core technology of this production process requires a singl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/76B01J29/46C07C31/10C07C29/00
Inventor 林旭锋席燕燕吕艳红
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)