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Catalyst for vinyl acetate synthesis and preparation method thereof and synthesis method of vinyl acetate

A vinyl acetate and catalyst technology, applied in the field of vinyl acetate synthesis, can solve the problems of short service life, low production capacity, rapid activity decline, etc., and achieve the effects of high yield, improved conversion rate and good stability

Inactive Publication Date: 2019-02-22
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the catalyst mainly used in the vapor phase synthesis of vinyl acetate by the acetylene method is zinc acetate / activated carbon, which has many disadvantages, such as rapid decline in activity, low production capacity (the productive rate of vinyl acetate is about 30%) and short service life, etc.

Method used

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  • Catalyst for vinyl acetate synthesis and preparation method thereof and synthesis method of vinyl acetate
  • Catalyst for vinyl acetate synthesis and preparation method thereof and synthesis method of vinyl acetate

Examples

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preparation example Construction

[0035] A kind of preparation method of the catalyst that the present invention proposes is used for acetylene method to prepare vinyl acetate, adopts following technical scheme to realize, introduce nitrogen element into catalyst simultaneously and introduce zinc element. It includes the following steps:

[0036] (1) dissolving a zinc salt containing at least one zinc element in an aqueous solution;

[0037] (2) join the chitosan containing nitrogen element in the above-mentioned zinc salt solution, fully stir, mix;

[0038] (3) The obtained mixture is placed in an oven, the moisture therein is volatilized, and evaporated to dryness;

[0039] (4) Then, by calcination and high-temperature treatment, a catalyst for the preparation of vinyl acetate by the acetylene method is obtained.

Embodiment 1

[0042] (1) 1g chitosan is added in 10ml zinc nitrate solution, contains 1g zinc nitrate in 10ml zinc nitrate solution, mechanically stirs it at room temperature and makes it mix uniformly, obtains solution 1;

[0043] (2) Place the obtained solution 1 in an oven (80° C.) for drying treatment, so that the water in it is evaporated to dryness to obtain a dry substance;

[0044] (3) Put the obtained dried material in a horse boiling furnace, raise the temperature to 900° C. at a rate of 5° C. / min, and calcinate at 900° C. for 1.5 h to obtain the catalyst.

[0045] Under the reaction conditions, the reaction temperature is 180°C, and the volume space velocity of the raw material is 300h -1 , The raw materials are composed of acetylene and acetic acid, and the molar ratio is acetylene: acetic acid = 2:1. The filling amount of the catalyst prepared above is 5mL, and the catalyst catalyzes the acetylene method to prepare vinyl acetate under the above conditions, and the yield of vin...

Embodiment 2

[0049] (1) Add 0.8 g of chitin to 10 ml of zinc chloride solution, 10 ml of zinc nitrate solution contains 1 g of zinc chloride, stir at room temperature, and mix thoroughly to obtain solution 1;

[0050] (2) Place the obtained solution 1 in an oven (80° C.) for drying treatment, so that the water in it is evaporated to dryness to obtain a dry substance;

[0051](3) Put the obtained dried material in a horse boiling furnace at a heating rate of 5° C. / min, raise the temperature to 700° C., and calcinate at 700° C. for 2.5 hours to obtain the catalyst.

[0052] Under the reaction conditions, the reaction temperature is 150°C, and the volume space velocity of the raw material is 700h -1 , The raw material is composed of acetylene and acetic acid, and the molar ratio is acetylene: acetic acid = 4:1. The filling amount of the catalyst prepared above is 5mL, and the catalyst catalyzes the acetylene method to prepare vinyl acetate under the above conditions, and the yield of vinyl a...

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Abstract

The invention discloses a catalyst for vinyl acetate synthesis and a preparation method thereof and a synthesis method of vinyl acetate. The preparation method of the catalyst for the vinyl acetate synthesis comprises the steps: (1) adding biomass into a zinc salt solution and uniformly mixing to obtain a solution 1; (2) drying the solution 1 and removing moisture to obtain a dry substance; and (3) calcining the dry substance at a high temperature to obtain the catalyst. The catalyst for the vinyl acetate synthesis and the preparation method thereof and the synthesis method of the vinyl acetate, which are disclosed by the invention, have the beneficial effects that the preparation method is simple and nitrogen in a nitrogen-doped carbon carrier can form zinc nitride with zinc to play a synergistic role with formed zinc oxide, thereby significantly improving the catalytic activity and stability of the catalyst during the vinyl acetate synthesis and improving the conversion rate of the vinyl acetate during the vinyl acetate synthesis; and by adopting the catalyst, the synthesis method is high in yield and good in stability and the yield of the vinyl acetate can be up to more than 60%.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a catalyst for synthesizing vinyl acetate, a preparation method and a vinyl acetate synthesis method. Background technique [0002] Vinyl acetate (VAc for short), also known as vinyl acetic acid, also known as vinyl acetate, is one of the 50 largest organic chemical raw materials in the world. It is mainly used in organic synthesis and widely used in the manufacture of polyvinyl acetate and polyvinyl alcohol. etc., and further processed and applied to the preparation of chemical reagents such as vinylon, adhesives and coating industries. [0003] At present, there are mainly two different technological routes used in the industrial production of vinyl acetate, namely the petroleum ethylene method and the calcium carbide acetylene method. my country's resource characteristics of "poor oil, little gas, and rich coal" determine the wide application of the technology of preparin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C67/04C07C69/15
CPCB01J27/24C07C67/04C07C69/15
Inventor 代斌胡立兵王绪根于锋
Owner SHIHEZI UNIVERSITY