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Prepn of solid phosphoric acid catalyst for oligomerization of propylene

A phosphoric acid catalyst, polyphosphoric acid technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems of poor catalyst stability, low crushing strength, etc., to improve extrusion, long service life, The effect of improving catalyst activity

Inactive Publication Date: 2004-06-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst is at a reaction temperature of 130-230°C, and the space velocity of the reaction raw material is 2.5-5.0hr -1 , under the condition of reaction pressure 2.0-6.0MPa, the highest conversion rate of olefin superposition reaction is 72.44%, and the crushing strength is low, only 170 N / cm 2 , poor catalyst stability
This document does not involve equipment material issues

Method used

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  • Prepn of solid phosphoric acid catalyst for oligomerization of propylene
  • Prepn of solid phosphoric acid catalyst for oligomerization of propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Corrosion test of metal materials against polyphosphoric acid.

[0024] Take metal material pieces of the same size, weigh them before the test, and then dip them in concentrations of P 2 o 5 In polyphosphoric acid with a weight of 83.5%, the immersion temperature is 200°C, and the immersion time is 30 days. The metal material pieces are taken out, weighed separately, and converted into corrosion thickness units. The results are listed in Table 1. It can be seen from the measurement results that T-1 steel has the strongest corrosion resistance to polyphosphoric acid, but it is expensive, followed by copper and electrolytic copper, and stainless steel has poor corrosion resistance.

[0025] metallic material

Embodiment 2

[0027] Raw material polyphosphoric acid preparation:

[0028] Add 43.8 kilograms of 83.5% (weight) polyphosphoric acid into the red copper reactor, heat up to 100°C, add 58.2 kilograms of phosphorus pentoxide, control the reaction temperature at 130-150°C, and continue stirring until the addition of phosphorus pentoxide is completed React for 4-5 hours until the material is completely dissolved to obtain polyphosphoric acid containing 83.5% phosphorus pentoxide by weight.

[0029] Preparation of solid phosphoric acid catalyst:

[0030] In the polyphosphoric acid prepared above, under electric stirring, add niobium pentoxide and 19.8 kg of boric acid respectively, control the reaction temperature at 180-200°C to make a polyphosphate mixture, and add 25.6 kg of dry diatomaceous earth at the same time In the kneader, add the polyphosphate mixture and knead for 4 minutes to obtain a viscous lump material, which is extruded and formed, dried at 170°C for 2 hours, roasted at 550°C ...

Embodiment 3

[0035] Raw material polyphosphoric acid preparation:

[0036] According to the preparation condition of example 2, difference: the reactor material is electrolytic copper, makes 100 kilograms of polyphosphoric acid, contains phosphorus pentoxide 80% by weight.

[0037] Preparation of solid phosphoric acid catalyst:

[0038] Add zirconia and 22.0 kg of boric acid to the polyphosphoric acid prepared above under electric stirring, and control the reaction temperature at 170-200°C to make a polyphosphate mixture. At the same time, add 26.5 kg of dry diatomaceous earth into the kneader, add Polyphosphate mixture, kneaded for 4 minutes to obtain a viscous lump material, extruded, dried at 200°C for 1 hour, roasted at 500°C for 2 hours; activated with a mixture of water vapor and air, activation process conditions: activation temperature 250 °C, the activation time was 4 hours, and the molar ratio of air:water vapor was 1.4:1, and the finished catalyst was obtained. The obtained so...

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Abstract

A preparation process of solid phosphoric acid catalyst for oligomerization of propylene includes preparing polyphosphate in 72-88 wt% at 120-180 deg.C in a copper reactor, preparing phosphate at 150-230 deg.C, mixing with diatomite, extruding into strips, drying by roasting, and activating. The molar ratio expression of the catalyst is SiAaBb(P2O5)c.(H2O)d. where A is at least one selected from B, Al and In; B is at least one selected from Ti, Zr, V, Nb, Cr, Mn, Mg and W; a=0.2-1.5; b=0.01-0.2; c=1.0-2.0; and d=0.6-1.2. The reactor is strongly resistant to corrosion of polyphosphate, the method has low production cost and the catalyst has high activity and high crushing strength.

Description

technical field [0001] The invention relates to a preparation method for propylene oligomerization solid phosphoric acid catalyst. Background technique [0002] Solid phosphoric acid catalyst (SPAC) is one of the catalysts widely used in the petrochemical industry. For the typical example of olefin oligomerization to prepare trimers and tetramers, nonene and dodecene are prepared from propylene by acidic catalyst oligomerization. It is characterized by relatively simple process and mature technology, and the main difference in the synthesis method is the use of different catalysts. According to relevant literature reports, so far, most of the industrial catalysts for the preparation of trimers and tetramers from propylene still use phosphoric acid series catalysts, including the liquid phosphoric acid catalyst of California Research Company, the copper pyrophosphate catalyst of Kellogg Company, Standard Oil's phosphoric acid-quartz catalyst, etc....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/18
CPCY02P20/52
Inventor 陈永福姚亚平袁梅卿黄尔峰徐菁
Owner CHINA PETROLEUM & CHEM CORP
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