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Catalyst regeneration method

A catalyst and binder technology, applied in the field of catalyst regeneration, can solve problems such as performance degradation, activity and selectivity deterioration, and activity loss of spent catalysts

Active Publication Date: 2018-08-21
SHANGHAI HUAYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Patent CN201310360236.1 reports a method of adjusting the regeneration catalyst through roasting atmosphere process condition parameters. This method has a certain effect on improving the activity of the spent catalyst, but the performance decline of the spent catalyst is not only the loss of activity, but accompanied by Simultaneous degradation of activity and selectivity, the method does not fully recover selectivity

Method used

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preparation example Construction

[0036] The catalysts of the present invention can be prepared by methods known in the art. In an example of the present invention, the preparation method of described catalyst comprises the steps:

[0037] (i) According to the stoichiometric relationship of the required catalyst, dissolve Mo, V and W sources in water at 70-100°C to obtain A solution, and the Mo, V and W sources are oxides of Mo, V and W Or salts that can generate oxides by roasting, such as ammonium salts, nitrates, carbonates, hydroxides, etc.;

[0038] (ii) According to the stoichiometric relationship of the required catalyst, dissolve Cu, X and Y sources in water at 60-80°C to obtain B solution; the Cu, X and Y sources are the oxidation of Cu, X and Y elements substances or salts that can generate oxides by roasting, such as ammonium salts, nitrates, carbonates, hydroxides, etc.;

[0039] (iii) Pour the B solution into the A solution under the condition of 40-80° C., and obtain the C solution after mixing...

Embodiment 1

[0090] 1. Deteriorated catalyst

[0091] Take the composition as Mo 12 V 2 Cu 1.8 W 2.5 Sb 2.2 Ni 0.8 o fThe hollow cylindrical catalyst is used as the reaction catalyst.

[0092] The raw material gas volume is composed of about 7% by volume of acrolein, about 9% by volume of oxygen, about 15% by volume of water vapor and 1.3% by volume and the balance nitrogen, and the catalyst is the above-mentioned one with Mo 12 V 2 Cu 1.8 W 2.5 Sb 2.2 Ni 0.8 o f The composition of the hollow cylindrical catalyst, the reaction temperature is about 250 ℃, the reaction pressure is normal pressure, and the space velocity is 1200h -1 In the reaction system, it was initially observed that the conversion rate of acrolein was 99.6 mol%, the selectivity of acrylic acid was 96.0 mol%, and the yield of acrylic acid was 95.6 mol%.

[0093] When it was observed that the selectivity of acrylic acid dropped to 96.0 mol%, and the yield of acrylic acid dropped to 95.6 mol%, it was determined...

Embodiment 2

[0104] Adopt the same catalyst regeneration method as in Example 1, except that the roasting method is changed to roasting under 100% nitrogen for 5h in the method of regeneration catalyst.

[0105] The evaluation results are shown in Table 1.

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Abstract

The invention relates to a method for regenerating a catalyst. The catalyst is applied to the preparation of acrylic acid from acrolein through oxidation and has a general formula as follows: Mo<12>VCuW<c>X<d>Y<e>O<f>, wherein X is at least one of Nb, Sb, Te, Ca, Ba and Zn; Y is one of Sr, Ni, La, Ce, Nd, Sm and Cs; a is 1.5 to 8.0; b is 0.1 to 5.0; c is 0.5 to 5.0; d is 0.1 to 4.0; e is 0.1 to 2.0; and f is a numerical value determined by oxidation numbers of component elements. The method comprises the following steps: (a) crushing the catalyst to be regenerated, and preparing a suspension; (b) carrying out heat preservation for 30 to 120 minutes at the temperature of 40 DEG C to 100 DEG C; (c) supplementing lost elements so as to enable the final catalyst to meet the stoichiometric amount of the general formula; and (d) carrying out drying, and carrying out forming roasting.

Description

technical field [0001] The present invention provides a method for regenerating a catalyst that can be used, for example, to prepare acrylic acid by oxidation of acrolein. The method of the invention makes full use of the old catalyst whose performance is seriously deteriorated when the new catalyst needs to be replaced on the device, and completely reproduces the performance of the new catalyst through regeneration. The method is especially suitable for the complete restoration of the chemical properties of the catalysts that have been in industrial operation for two years or more. Background technique [0002] Since the 1970s, the world's acrylic acid production equipment mainly adopts the two-step oxidation method of propylene, which has mature technology and good economy. Up to now, it is still the mainstream process in the acrylic acid industry. [0003] For the second step of the reaction, the catalyst for acrolein oxidation to acrylic acid, it has been recognized tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/94B01J38/02C07C57/055C07C51/235
CPCY02P20/584
Inventor 蔡敏李雪梅冯世强庄岩吴通好马建学褚小东季金华
Owner SHANGHAI HUAYI NEW MATERIAL
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