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Solid phosphoric acid catalyst and its prepn process

A phosphoric acid catalyst, solid technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of unsatisfactory crushing strength of catalysts, reduce production process, simplify operation process, Requires a loose effect

Inactive Publication Date: 2004-06-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the purposes of the present invention is to provide a new solid phosphoric acid catalyst, which has good water resistance and high crushing strength, in order to overcome the defects that the prior art does not involve the water resistance of the catalyst and the crushing strength of the catalyst is not ideal enough characteristics, while the catalyst still maintains a high catalytic activity

Method used

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  • Solid phosphoric acid catalyst and its prepn process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of Catalyst A:

[0029] 700 grams of concentration 83% (in P 2 o 5 (by weight) polyphosphoric acid is placed in a 2000 ml beaker, heated to 100 ° C, under electric stirring, 70 grams of boric acid is added, and reacted for 30 minutes to make polyphosphate; at the same time, 190 grams of dry diatomaceous earth and a certain amount Phosphotungstic acid H 7 P(W 2 o 7 ) 6 ·xH 2 O (x is generally between 9 and 17) is placed in a kneader, mixed evenly, added the polyphosphate prepared by the above reaction, kneaded in the kneader for 5 minutes, and blended evenly to obtain a viscous Paste material, the material is extruded into cylindrical particles of 4×6-8mm, dried at 150°C for 2 hours, roasted at 500°C for 5 hours, cooled naturally to room temperature to obtain a catalyst precursor; then loaded into Ф50 In the stainless steel tubular activation tower of × 1000 millimeters, pass into air and water vapor to carry out activation, air: water vapor molar rati...

Embodiment 2

[0033] Preparation of Catalyst B:

[0034] According to the preparation method of Example 1, the difference: replace 70 grams of boric acid with 47 grams of boron oxide, change the amount of phosphotungstic acid, a certain amount of phosphotungstic acid is made into a 20% (weight) aqueous solution, add to the diatomaceous earth In the kneader, mix homogeneously, the solid phosphoric acid catalyst B that makes consists of:

[0035] Si 1 B 0.5 W 0.15 (P 2 o 5 ) 1.55 ·(H 2 O) 0.8

[0036] According to the aforementioned catalyst evaluation method, catalyst B was used for butene-2 ​​oligomerization reaction, and the evaluation process conditions were: reaction temperature 180 ° C, pressure 5.0 MPa, liquid volume space velocity 2.0 hours -1 , the raw material butene-2 ​​concentration is 82.8% (mass). Catalyst evaluation results: the average conversion rate of butene-2 ​​is 84.0%, and the selectivity of octene is 88.5%.

Embodiment 3

[0038] Preparation of Catalyst C:

[0039] According to the preparation method of Example 1, the difference: replace boric acid with magnesium oxide, use silicotungstic acid (H 4 SiW 12 o 40 ·7H 2 O) instead of phosphotungstic acid, the obtained solid phosphoric acid catalyst C consists of:

[0040] Si 1 Mg 0.2 W 0.10 (P 2 o 5 ) 1.55 ·(H 2 O) 0.8

[0041] The catalyst was evaluated according to the evaluation method in Example 1, and the evaluation results of the catalyst were: the average conversion rate of propylene was 80.8%, and the selectivity of propylene oligomers was 83.4%.

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Abstract

The solid phosphoric acid catalyst of the present invention has the chemical general expression of A1BaWb(P2O5)c.(H2O)d, where A is Si, B is B, Sb, Bi, Mg or their mixture, W is tungsten, and a, b, c and d are corresponding molar portions when component A is 1. The preparation process of the catalyst includes preparing phosphate polymer with preheated phosphoric acid polymer and component B; mixing phosphate polymer with the mixture of component A and component W; and the forming, drying, roasting and activating of the formed material; with component W being introduced in the form of heteropolyacid of W. The catalyst has high catalytic activity, high water resistance and high crushing resistance, and may be used in industrial production.

Description

technical field [0001] The invention relates to a solid phosphoric acid catalyst and a preparation method thereof. Background technique [0002] Solid phosphoric acid catalyst (SPAC) is one of the catalysts widely used in the petrochemical industry. It is used in the oligomerization, superposition, and alkylation of low-carbon olefins. The solid phosphoric acid catalyst is mainly made of phosphoric acid or polyphosphoric acid and a silicon-containing carrier. The preparation method includes impregnation method and blending method. In the early research, people mostly used the impregnation method to prepare solid phosphoric acid catalyst, but due to the long production cycle, the activity of the catalyst was not high, so it was not widely used; the blending method is to combine phosphoric acid or phosphoric acid. Polyphosphoric acid is blended with diatomaceous earth, the third component is introduced, and it is made by extruding, drying, roast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/18B01J27/188
Inventor 张丽君陈永福徐菁
Owner CHINA PETROLEUM & CHEM CORP
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