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Catalyst for preparing acrylic acid or acrolein and its preparation method

A catalyst and acrolein technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low selectivity of target products, serious carbon deposition in equipment, high content of by-products, etc., and achieve excellent results Anti-carbon performance, improved service life, and high yield

Active Publication Date: 2022-01-25
ZHEJIANG NHU CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of selective oxidation of propylene is commonly used in industry. The core of this process lies in the preparation of catalysts. The commonly used ones are supported Mo-Bi catalysts. The conversion rate of propylene is about 95%, and the yield of acrolein is 82%. around, with high content of by-products
In addition, the catalytic reaction is a strong exothermic reaction, which is easy to form local high-temperature hot spots, and the equipment has serious carbon deposition
[0006] In summary, in the process of selective oxidation of propylene to prepare acrylic acid and acrolein, there are problems of low selectivity of target products, high content of by-products, high carbon deposition, and difficult separation.

Method used

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  • Catalyst for preparing acrylic acid or acrolein and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A

[0074] First, 135.8g ammonium molybdate, 37.2g cobalt nitrate and 13.9g cerium nitrate were dissolved in 500mL distilled water, and fully stirred and dissolved under the action of a high-shear stirrer to obtain solution A; secondly, 66.6g ammonium metatungstate and 60.6g Ammonium metavanadate was dissolved in 230mL of distilled water to form solution B, and under the action of a peristaltic pump, solution B was slowly added dropwise to solution A to form material I; subsequently, 15.5g of bismuth nitrate was dissolved in 60mL with a volume fraction of 13 % dilute nitric acid solution to form solution C, and solution C is added dropwise to material I according to the dripping method of solution B. At the same time, 100g tetraphenylphosphorous chloride and 40g palmitic acid are added to material I to form material II. After being fully stirred and mixed, the obtained material is spray-dried. Specifically, the spray-drying conditions were set as the inlet air temperature was 200°...

Embodiment 1B

[0078] The preparation of the catalyst active component is basically the same as in Example 1-1, except that the phosphorus-containing ion additive is replaced by 68 g of tetramethylphosphorus bromide from 100 g of tetraphenylphosphorous chloride. The prepared catalyst is P2, and its molecular formula is Mo 12 Bi 0.5 Ni 2 Ce 0.5 V 8.1 W 4.2 o 68.4 .

[0079] The selection of the catalyst carrier powder and the catalyst molding method are also basically the same as those in Example 1-1.

[0080] Similarly, the catalyst evaluation is basically the same as in Example 1-1. Weigh 45g of the molded catalyst sample and fill it in a fixed-bed reactor, and perform performance evaluation according to the evaluation conditions of the above-mentioned acrylic acid catalyst. The evaluation results show that the conversion of propylene The yield of acrylic acid was 96.4%, the yield of acrylic acid was 90.6%, and the yield of acrolein was 4.5%. The 500h life test of the catalyst found ...

Embodiment 1C

[0082] Dissolve 148.6g ammonium molybdate, 102.3g cobalt nitrate, 28.3g iron nitrate, 1.4g potassium nitrate and 9.1g lanthanum nitrate in 500mL distilled water to form solution A; secondly, weigh 53.2g ammonium metavanadate and 104.1g Ammonium dodecametatungstate was dissolved in 250mL of distilled water, and fully dissolved to form solution B, then under the action of a peristaltic pump, according to the dropping rate of 36mL / h and under the action of a high-shear stirrer, it was added dropwise to Suspension I was formed in solution A; then, 34.3g of bismuth nitrate was weighed and dissolved in 120mL of dilute nitric acid solution with a volume fraction of 13% to form solution C, and solution C was slowly added dropwise to the above-mentioned In the I suspension, at the same time, 400mL ethanol solution formed by 150g tetrabutylphosphorus bromide and 44g polyvinyl alcohol was added in the suspension I according to the same adding method, after the rapid stirring of the high-s...

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Abstract

The invention provides a catalyst, comprising a carrier and a composite metal oxide Mo a Bi b x c Y d Z e o f , X is selected from at least one of Fe, Co and Ni; Y is selected from at least one of Na, K, Cs, Ba, La and Ce; Z is selected from at least one of V, W and Cr; and a: b: c: d: e=12: (0.5-2.5): (0.5-3): (0.005-0.5): (0.5-10); f is the total number of oxygen atoms required to satisfy the valence of other elements. When the catalyst is used in the selective oxidation of propylene to prepare acrylic acid and acrolein, it has highly specific selectivity and excellent anti-coking performance, and the conversion rate of propylene is high, and the yield of the target product is also high, which not only achieves directional selectivity The goal of producing acrylic acid or acrolein, and greatly improving the service life of the catalyst.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a catalyst for preparing acrylic acid or acrolein and a preparation method thereof. Background technique [0002] Acrylic acid (AA) is an unsaturated fatty acid. As an important chemical raw material, it is mainly used in the production of acrylate, acrylic resin, acrylic rubber and polyacrylate. At present, acrylic acid can be prepared industrially by a two-step oxidation of propylene. First, propylene is oxidized to acrolein under the condition of molybdenum-bismuth oxide as a catalyst, and then acrolein is further oxidized under the condition of molybdenum-vanadium oxide as a catalyst. Is oxidized to acrylic acid. The conversion rate of propylene produced in this way is about 95%, and the yield of acrylic acid is between 85% and 88%. %, resulting in difficult post-processing, higher production costs, and lower quality and quality of acrylic acid products. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/888B01J23/887B01J35/10B01J37/08C07C51/21C07C57/04C07C45/35C07C47/22
CPCB01J23/8885B01J23/8878B01J23/002B01J35/1019B01J35/1061B01J35/1042B01J37/082C07C51/21C07C45/35B01J2523/00C07C57/04C07C47/22B01J2523/847B01J2523/69B01J2523/68B01J2523/55B01J2523/54B01J2523/3712B01J2523/842B01J2523/845B01J2523/3706B01J2523/13B01J2523/12B01J2523/67C07C51/252B01J27/198B01J37/0018B01J37/0009B01J37/0045B01J37/088B01J2523/51
Inventor 陈志荣董延召王志轩王勇王正江于丽丽龚鹏宇李浩然冯晨
Owner ZHEJIANG NHU CO LTD
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